Import sources from 2011-03-30 iso image

52 files changed, 3424 insertions, 0 deletions

diff --git a/sys/src/libstdio/Stdio.h b/sys/src/libstdio/Stdio.h
new file mode 100755
index 000000000..909c90705
--- /dev/null
+++ b/sys/src/libstdio/Stdio.h
@@ -0,0 +1,109 @@
+/*
+ * pANS stdio.h
+ */
+/*
+ * According to X3J11, there is only one i/o buffer
+ * and it must not be occupied by both input and output data.
+ *	If rp<wp, we must have state==RD and
+ *	if wp<rp, we must have state==WR, so that getc and putc work correctly.
+ *	On open, rp, wp and buf are set to 0, so first getc or putc will call _IO_getc
+ *	or _IO_putc, which will allocate the buffer.
+ *	If setvbuf(., ., _IONBF, .) is called, bufl is set to 0 and
+ *	buf, rp and wp are pointed at unbuf.
+ *	If setvbuf(., ., _IOLBF, .) is called, _IO_putc leaves wp and rp pointed at the
+ *	end of the buffer so that it can be called on each putc to check whether it's got
+ *	a newline.  This nonsense is in order to avoid impacting performance of the other
+ *	buffering modes more than necessary -- putting the test in putc adds many
+ *	instructions that are wasted in non-_IOLBF mode:
+ *	#define putc(c, f)	(_IO_ctmp=(c),\
+ *				(f)->wp>=(f)->rp || (f)->flags&LINEBUF && _IO_ctmp=='\n'\
+ *					?_IO_putc(_IO_ctmp, f)\
+ *					:*(f)->wp++=_IO_ctmp)
+ *				
+ */
+typedef struct{
+	int fd;		/* UNIX file pointer */
+	char flags;	/* bits for must free buffer on close, line-buffered */
+	char state;	/* last operation was read, write, position, error, eof */
+	char *buf;	/* pointer to i/o buffer */
+	char *rp;	/* read pointer (or write end-of-buffer) */
+	char *wp;	/* write pointer (or read end-of-buffer) */
+	char *lp;	/* actual write pointer used when line-buffering */
+	long bufl;	/* actual length of buffer */
+	char unbuf[1];	/* tiny buffer for unbuffered io (used for ungetc?) */
+}FILE;
+typedef long fpos_t;
+#ifndef NULL
+#define	NULL	0
+#endif
+/*
+ * Third arg of setvbuf
+ */
+#define	_IOFBF	1			/* block-buffered */
+#define	_IOLBF	2			/* line-buffered */
+#define	_IONBF	3			/* unbuffered */
+#define	BUFSIZ	4096			/* size of setbuf buffer */
+#define	EOF	(-1)			/* returned on end of file */
+#define	FOPEN_MAX	128		/* max files open */
+#define	FILENAME_MAX	BUFSIZ		/* silly filename length */
+#define	L_tmpnam	20		/* sizeof "/tmp/abcdefghij9999 */
+#define	SEEK_CUR	1
+#define	SEEK_END	2
+#define	SEEK_SET	0
+#define	TMP_MAX		64		/* very hard to set correctly */
+#define	stderr	(&_IO_stream[2])
+#define	stdin	(&_IO_stream[0])
+#define	stdout	(&_IO_stream[1])
+#define	_IO_CHMASK	0377		/* mask for 8 bit characters */
+FILE *tmpfile(void);
+char *tmpnam(char *);
+int fclose(FILE *);
+int fflush(FILE *);
+FILE *fopen(const char *, const char *);
+FILE *freopen(const char *, const char *, FILE *);
+void setbuf(FILE *, char *);
+int setvbuf(FILE *, char *, int, long);
+int fprintf(FILE *, const char *, ...);
+int fscanf(FILE *, const char *, ...);
+int printf(const char *, ...);
+int scanf(const char *, ...);
+int sprintf(char *, const char *, ...);
+int sscanf(const char *, const char *, ...);
+int vfprintf(FILE *, const char *, va_list);
+int vprintf(const char *, va_list);
+int vsprintf(char *, const char *, va_list);
+int vfscanf(FILE *, const char *, va_list);
+int fgetc(FILE *);
+char *fgets(char *, int, FILE *);
+int fputc(int, FILE *);
+int fputs(const char *, FILE *);
+int getc(FILE *);
+#define	getc(f)	((f)->rp>=(f)->wp?_IO_getc(f):*(f)->rp++&_IO_CHMASK)
+int _IO_getc(FILE *f);
+int getchar(void);
+#define	getchar()	getc(stdin)
+char *gets(char *);
+int putc(int, FILE *);
+#define	putc(c, f) ((f)->wp>=(f)->rp?_IO_putc(c, f):(*(f)->wp++=c)&_IO_CHMASK)
+int _IO_putc(int, FILE *);
+int putchar(int);
+#define	putchar(c)	putc(c, stdout)
+int puts(const char *);
+int ungetc(int, FILE *);
+long fread(void *, long, long, FILE *);
+long fwrite(const void *, long, long, FILE *);
+int fgetpos(FILE *, fpos_t *);
+int fseek(FILE *, long int, int);
+int fsetpos(FILE *, const fpos_t *);
+long int ftell(FILE *);
+void rewind(FILE *);
+void clearerr(FILE *);
+int feof(FILE *);
+int ferror(FILE *);
+void perror(const char *);
+extern FILE _IO_stream[FOPEN_MAX];
+FILE *sopenr(const char *);
+FILE *sopenw(void);
+char *sclose(FILE *);
+char	*dtoa(double, int, int, int*, int*, char**);
+void	freedtoa(char*);
diff --git a/sys/src/libstdio/_IO_getc.c b/sys/src/libstdio/_IO_getc.c
new file mode 100755
index 000000000..b6ab110c0
--- /dev/null
+++ b/sys/src/libstdio/_IO_getc.c
@@ -0,0 +1,26 @@
+/*
+ * pANS stdio -- _IO_getc
+ */
+#include "iolib.h"
+int _IO_getc(FILE *f){
+	int cnt;
+	switch(f->state){
+	default:	/* CLOSED, WR, ERR, EOF */
+		return EOF;
+	case OPEN:
+		_IO_setvbuf(f);
+	case RDWR:
+	case RD:
+		if(f->flags&STRING) return EOF;
+		cnt=read(f->fd, f->buf, f->buf==f->unbuf?1:f->bufl);
+		switch(cnt){
+		case -1: f->state=ERR; return EOF;
+		case 0: f->state=END; return EOF;
+		default:
+			f->state=RD;
+			f->rp=f->buf;
+			f->wp=f->buf+cnt;
+			return (*f->rp++)&_IO_CHMASK;
+		}
+	}
+}
diff --git a/sys/src/libstdio/_IO_putc.c b/sys/src/libstdio/_IO_putc.c
new file mode 100755
index 000000000..4c3a74238
--- /dev/null
+++ b/sys/src/libstdio/_IO_putc.c
@@ -0,0 +1,105 @@
+/*
+ * pANS stdio -- _IO_putc, _IO_cleanup
+ */
+#include "iolib.h"
+void _IO_cleanup(void){
+	fflush(NULL);
+}
+/*
+ * Look this over for simplification
+ */
+int _IO_putc(int c, FILE *f){
+	int cnt;
+	static int first=1;
+	switch(f->state){
+	case RD:
+		f->state=ERR;
+	case ERR:
+	case CLOSED:
+		return EOF;
+	case OPEN:
+		_IO_setvbuf(f);
+		/* fall through */
+	case RDWR:
+	case END:
+		f->rp=f->buf+f->bufl;
+		if(f->flags&LINEBUF){
+			f->wp=f->rp;
+			f->lp=f->buf;
+		}
+		else
+			f->wp=f->buf;
+		break;
+	}
+	if(first){
+		atexit(_IO_cleanup);
+		first=0;
+	}
+	if(f->flags&STRING){
+		f->rp=f->buf+f->bufl;
+		if(f->wp==f->rp){
+			if(f->flags&BALLOC)
+				f->buf=realloc(f->buf, f->bufl+BUFSIZ);
+			else{
+				f->state=ERR;
+				return EOF;
+			}
+			if(f->buf==NULL){
+				f->state=ERR;
+				return EOF;
+			}
+			f->rp=f->buf+f->bufl;
+			f->bufl+=BUFSIZ;
+		}
+		*f->wp++=c;
+	}
+	else if(f->flags&LINEBUF){
+		if(f->lp==f->rp){
+			cnt=f->lp-f->buf;
+			if(f->flags&APPEND) seek(f->fd, 0L, 2);
+			if(cnt!=0 && write(f->fd, f->buf, cnt)!=cnt){
+				f->state=ERR;
+				return EOF;
+			}
+			f->lp=f->buf;
+		}
+		*f->lp++=c;
+		if(c=='\n'){
+			cnt=f->lp-f->buf;
+			if(f->flags&APPEND) seek(f->fd, 0L, 2);
+			if(cnt!=0 && write(f->fd, f->buf, cnt)!=cnt){
+				f->state=ERR;
+				return EOF;
+			}
+			f->lp=f->buf;
+		}
+	}
+	else if(f->buf==f->unbuf){
+		f->unbuf[0]=c;
+		if(f->flags&APPEND) seek(f->fd, 0L, 2);
+		if(write(f->fd, f->buf, 1)!=1){
+			f->state=ERR;
+			return EOF;
+		}
+	}
+	else{
+		if(f->wp==f->rp){
+			cnt=f->wp-f->buf;
+			if(f->flags&APPEND) seek(f->fd, 0L, 2);
+			if(cnt!=0 && write(f->fd, f->buf, cnt)!=cnt){
+				f->state=ERR;
+				return EOF;
+			}
+			f->wp=f->buf;
+			f->rp=f->buf+f->bufl;
+		}
+		*f->wp++=c;
+	}
+	f->state=WR;
+	/*
+	 * Make sure EOF looks different from putc(-1)
+	 * Should be able to cast to unsigned char, but
+	 * there's a vc bug preventing that from working
+	 */
+	return c&0xff;
+}
diff --git a/sys/src/libstdio/clearerr.c b/sys/src/libstdio/clearerr.c
new file mode 100755
index 000000000..904e33581
--- /dev/null
+++ b/sys/src/libstdio/clearerr.c
@@ -0,0 +1,14 @@
+/*
+ * pANS stdio -- clearerr
+ */
+#include "iolib.h"
+void clearerr(FILE *f){
+	switch(f->state){
+	case ERR:
+		f->state=f->buf?RDWR:OPEN;
+		break;
+	case END:
+		f->state=RDWR;
+		break;
+	}
+}
diff --git a/sys/src/libstdio/dtoa.c b/sys/src/libstdio/dtoa.c
new file mode 100755
index 000000000..26441ded7
--- /dev/null
+++ b/sys/src/libstdio/dtoa.c
@@ -0,0 +1,1293 @@
+/* derived from /netlib/fp/dtoa.c assuming IEEE, Standard C */
+/* kudos to dmg@bell-labs.com, gripes to ehg@bell-labs.com */
+
+/* Let x be the exact mathematical number defined by a decimal
+ *	string s.  Then atof(s) is the round-nearest-even IEEE
+ *	floating point value.
+ * Let y be an IEEE floating point value and let s be the string
+ *	printed as %.17g.  Then atof(s) is exactly y.
+ */
+#include <u.h>
+#include <libc.h>
+
+static Lock _dtoalk[2];
+#define ACQUIRE_DTOA_LOCK(n)	lock(&_dtoalk[n])
+#define FREE_DTOA_LOCK(n)	unlock(&_dtoalk[n])
+#define PRIVATE_mem ((2000+sizeof(double)-1)/sizeof(double))
+static double private_mem[PRIVATE_mem], *pmem_next = private_mem;
+#define FLT_ROUNDS	1
+#define DBL_DIG		15
+#define DBL_MAX_10_EXP	308
+#define DBL_MAX_EXP	1024
+#define FLT_RADIX	2
+#define Storeinc(a,b,c) (*a++ = b << 16 | c & 0xffff)
+#define fpword0(x) ((FPdbleword*)&x)->hi
+#define fpword1(x) ((FPdbleword*)&x)->lo
+/* Ten_pmax = floor(P*log(2)/log(5)) */
+/* Bletch = (highest power of 2 < DBL_MAX_10_EXP) / 16 */
+/* Quick_max = floor((P-1)*log(FLT_RADIX)/log(10) - 1) */
+/* Int_max = floor(P*log(FLT_RADIX)/log(10) - 1) */
+
+#define Exp_shift  20
+#define Exp_shift1 20
+#define Exp_msk1    0x100000
+#define Exp_msk11   0x100000
+#define Exp_mask  0x7ff00000
+#define P 53
+#define Bias 1023
+#define Emin (-1022)
+#define Exp_1  0x3ff00000
+#define Exp_11 0x3ff00000
+#define Ebits 11
+#define Frac_mask  0xfffff
+#define Frac_mask1 0xfffff
+#define Ten_pmax 22
+#define Bletch 0x10
+#define Bndry_mask  0xfffff
+#define Bndry_mask1 0xfffff
+#define LSB 1
+#define Sign_bit 0x80000000
+#define Log2P 1
+#define Tiny0 0
+#define Tiny1 1
+#define Quick_max 14
+#define Int_max 14
+#define Avoid_Underflow
+
+#define rounded_product(a,b) a *= b
+#define rounded_quotient(a,b) a /= b
+
+#define Big0 (Frac_mask1 | Exp_msk1*(DBL_MAX_EXP+Bias-1))
+#define Big1 0xffffffff
+
+#define FFFFFFFF 0xffffffffUL
+
+#undef ULint
+
+#define Kmax 15
+
+struct
+Bigint {
+	struct Bigint *next;
+	int	k, maxwds, sign, wds;
+	unsigned int x[1];
+};
+
+typedef struct Bigint Bigint;
+
+static Bigint *freelist[Kmax+1];
+
+static Bigint *
+Balloc(int k)
+{
+	int	x;
+	Bigint * rv;
+	unsigned int	len;
+
+	ACQUIRE_DTOA_LOCK(0);
+	if (rv = freelist[k]) {
+		freelist[k] = rv->next;
+	} else {
+		x = 1 << k;
+		len = (sizeof(Bigint) + (x - 1) * sizeof(unsigned int) + sizeof(double) -1)
+		 / sizeof(double);
+		if (pmem_next - private_mem + len <= PRIVATE_mem) {
+			rv = (Bigint * )pmem_next;
+			pmem_next += len;
+		} else
+			rv = (Bigint * )malloc(len * sizeof(double));
+		rv->k = k;
+		rv->maxwds = x;
+	}
+	FREE_DTOA_LOCK(0);
+	rv->sign = rv->wds = 0;
+	return rv;
+}
+
+static void	
+Bfree(Bigint *v)
+{
+	if (v) {
+		ACQUIRE_DTOA_LOCK(0);
+		v->next = freelist[v->k];
+		freelist[v->k] = v;
+		FREE_DTOA_LOCK(0);
+	}
+}
+
+#define Bcopy(x,y) memcpy((char *)&x->sign, (char *)&y->sign, \
+y->wds*sizeof(int) + 2*sizeof(int))
+
+static Bigint *
+multadd(Bigint *b, int m, int a)	/* multiply by m and add a */
+{
+	int	i, wds;
+	unsigned int carry, *x, y;
+	unsigned int xi, z;
+	Bigint * b1;
+
+	wds = b->wds;
+	x = b->x;
+	i = 0;
+	carry = a;
+	do {
+		xi = *x;
+		y = (xi & 0xffff) * m + carry;
+		z = (xi >> 16) * m + (y >> 16);
+		carry = z >> 16;
+		*x++ = (z << 16) + (y & 0xffff);
+	} while (++i < wds);
+	if (carry) {
+		if (wds >= b->maxwds) {
+			b1 = Balloc(b->k + 1);
+			Bcopy(b1, b);
+			Bfree(b);
+			b = b1;
+		}
+		b->x[wds++] = carry;
+		b->wds = wds;
+	}
+	return b;
+}
+
+static Bigint *
+s2b(const char *s, int nd0, int nd, unsigned int y9)
+{
+	Bigint * b;
+	int	i, k;
+	int x, y;
+
+	x = (nd + 8) / 9;
+	for (k = 0, y = 1; x > y; y <<= 1, k++) 
+		;
+	b = Balloc(k);
+	b->x[0] = y9;
+	b->wds = 1;
+
+	i = 9;
+	if (9 < nd0) {
+		s += 9;
+		do 
+			b = multadd(b, 10, *s++ - '0');
+		while (++i < nd0);
+		s++;
+	} else
+		s += 10;
+	for (; i < nd; i++)
+		b = multadd(b, 10, *s++ - '0');
+	return b;
+}
+
+static int	
+hi0bits(register unsigned int x)
+{
+	register int	k = 0;
+
+	if (!(x & 0xffff0000)) {
+		k = 16;
+		x <<= 16;
+	}
+	if (!(x & 0xff000000)) {
+		k += 8;
+		x <<= 8;
+	}
+	if (!(x & 0xf0000000)) {
+		k += 4;
+		x <<= 4;
+	}
+	if (!(x & 0xc0000000)) {
+		k += 2;
+		x <<= 2;
+	}
+	if (!(x & 0x80000000)) {
+		k++;
+		if (!(x & 0x40000000))
+			return 32;
+	}
+	return k;
+}
+
+static int	
+lo0bits(unsigned int *y)
+{
+	register int	k;
+	register unsigned int x = *y;
+
+	if (x & 7) {
+		if (x & 1)
+			return 0;
+		if (x & 2) {
+			*y = x >> 1;
+			return 1;
+		}
+		*y = x >> 2;
+		return 2;
+	}
+	k = 0;
+	if (!(x & 0xffff)) {
+		k = 16;
+		x >>= 16;
+	}
+	if (!(x & 0xff)) {
+		k += 8;
+		x >>= 8;
+	}
+	if (!(x & 0xf)) {
+		k += 4;
+		x >>= 4;
+	}
+	if (!(x & 0x3)) {
+		k += 2;
+		x >>= 2;
+	}
+	if (!(x & 1)) {
+		k++;
+		x >>= 1;
+		if (!x & 1)
+			return 32;
+	}
+	*y = x;
+	return k;
+}
+
+static Bigint *
+i2b(int i)
+{
+	Bigint * b;
+
+	b = Balloc(1);
+	b->x[0] = i;
+	b->wds = 1;
+	return b;
+}
+
+static Bigint *
+mult(Bigint *a, Bigint *b)
+{
+	Bigint * c;
+	int	k, wa, wb, wc;
+	unsigned int * x, *xa, *xae, *xb, *xbe, *xc, *xc0;
+	unsigned int y;
+	unsigned int carry, z;
+	unsigned int z2;
+
+	if (a->wds < b->wds) {
+		c = a;
+		a = b;
+		b = c;
+	}
+	k = a->k;
+	wa = a->wds;
+	wb = b->wds;
+	wc = wa + wb;
+	if (wc > a->maxwds)
+		k++;
+	c = Balloc(k);
+	for (x = c->x, xa = x + wc; x < xa; x++)
+		*x = 0;
+	xa = a->x;
+	xae = xa + wa;
+	xb = b->x;
+	xbe = xb + wb;
+	xc0 = c->x;
+	for (; xb < xbe; xb++, xc0++) {
+		if (y = *xb & 0xffff) {
+			x = xa;
+			xc = xc0;
+			carry = 0;
+			do {
+				z = (*x & 0xffff) * y + (*xc & 0xffff) + carry;
+				carry = z >> 16;
+				z2 = (*x++ >> 16) * y + (*xc >> 16) + carry;
+				carry = z2 >> 16;
+				Storeinc(xc, z2, z);
+			} while (x < xae);
+			*xc = carry;
+		}
+		if (y = *xb >> 16) {
+			x = xa;
+			xc = xc0;
+			carry = 0;
+			z2 = *xc;
+			do {
+				z = (*x & 0xffff) * y + (*xc >> 16) + carry;
+				carry = z >> 16;
+				Storeinc(xc, z, z2);
+				z2 = (*x++ >> 16) * y + (*xc & 0xffff) + carry;
+				carry = z2 >> 16;
+			} while (x < xae);
+			*xc = z2;
+		}
+	}
+	for (xc0 = c->x, xc = xc0 + wc; wc > 0 && !*--xc; --wc) 
+		;
+	c->wds = wc;
+	return c;
+}
+
+static Bigint *p5s;
+
+static Bigint *
+pow5mult(Bigint *b, int k)
+{
+	Bigint * b1, *p5, *p51;
+	int	i;
+	static int	p05[3] = { 
+		5, 25, 125 	};
+
+	if (i = k & 3)
+		b = multadd(b, p05[i-1], 0);
+
+	if (!(k >>= 2))
+		return b;
+	if (!(p5 = p5s)) {
+		/* first time */
+		ACQUIRE_DTOA_LOCK(1);
+		if (!(p5 = p5s)) {
+			p5 = p5s = i2b(625);
+			p5->next = 0;
+		}
+		FREE_DTOA_LOCK(1);
+	}
+	for (; ; ) {
+		if (k & 1) {
+			b1 = mult(b, p5);
+			Bfree(b);
+			b = b1;
+		}
+		if (!(k >>= 1))
+			break;
+		if (!(p51 = p5->next)) {
+			ACQUIRE_DTOA_LOCK(1);
+			if (!(p51 = p5->next)) {
+				p51 = p5->next = mult(p5, p5);
+				p51->next = 0;
+			}
+			FREE_DTOA_LOCK(1);
+		}
+		p5 = p51;
+	}
+	return b;
+}
+
+static Bigint *
+lshift(Bigint *b, int k)
+{
+	int	i, k1, n, n1;
+	Bigint * b1;
+	unsigned int * x, *x1, *xe, z;
+
+	n = k >> 5;
+	k1 = b->k;
+	n1 = n + b->wds + 1;
+	for (i = b->maxwds; n1 > i; i <<= 1)
+		k1++;
+	b1 = Balloc(k1);
+	x1 = b1->x;
+	for (i = 0; i < n; i++)
+		*x1++ = 0;
+	x = b->x;
+	xe = x + b->wds;
+	if (k &= 0x1f) {
+		k1 = 32 - k;
+		z = 0;
+		do {
+			*x1++ = *x << k | z;
+			z = *x++ >> k1;
+		} while (x < xe);
+		if (*x1 = z)
+			++n1;
+	} else 
+		do
+			*x1++ = *x++;
+		while (x < xe);
+	b1->wds = n1 - 1;
+	Bfree(b);
+	return b1;
+}
+
+static int	
+cmp(Bigint *a, Bigint *b)
+{
+	unsigned int * xa, *xa0, *xb, *xb0;
+	int	i, j;
+
+	i = a->wds;
+	j = b->wds;
+	if (i -= j)
+		return i;
+	xa0 = a->x;
+	xa = xa0 + j;
+	xb0 = b->x;
+	xb = xb0 + j;
+	for (; ; ) {
+		if (*--xa != *--xb)
+			return * xa < *xb ? -1 : 1;
+		if (xa <= xa0)
+			break;
+	}
+	return 0;
+}
+
+static Bigint *
+diff(Bigint *a, Bigint *b)
+{
+	Bigint * c;
+	int	i, wa, wb;
+	unsigned int * xa, *xae, *xb, *xbe, *xc;
+	unsigned int borrow, y;
+	unsigned int z;
+
+	i = cmp(a, b);
+	if (!i) {
+		c = Balloc(0);
+		c->wds = 1;
+		c->x[0] = 0;
+		return c;
+	}
+	if (i < 0) {
+		c = a;
+		a = b;
+		b = c;
+		i = 1;
+	} else
+		i = 0;
+	c = Balloc(a->k);
+	c->sign = i;
+	wa = a->wds;
+	xa = a->x;
+	xae = xa + wa;
+	wb = b->wds;
+	xb = b->x;
+	xbe = xb + wb;
+	xc = c->x;
+	borrow = 0;
+	do {
+		y = (*xa & 0xffff) - (*xb & 0xffff) - borrow;
+		borrow = (y & 0x10000) >> 16;
+		z = (*xa++ >> 16) - (*xb++ >> 16) - borrow;
+		borrow = (z & 0x10000) >> 16;
+		Storeinc(xc, z, y);
+	} while (xb < xbe);
+	while (xa < xae) {
+		y = (*xa & 0xffff) - borrow;
+		borrow = (y & 0x10000) >> 16;
+		z = (*xa++ >> 16) - borrow;
+		borrow = (z & 0x10000) >> 16;
+		Storeinc(xc, z, y);
+	}
+	while (!*--xc)
+		wa--;
+	c->wds = wa;
+	return c;
+}
+
+static double	
+ulp(double x)
+{
+	register int L;
+	double	a;
+
+	L = (fpword0(x) & Exp_mask) - (P - 1) * Exp_msk1;
+	fpword0(a) = L;
+	fpword1(a) = 0;
+	return a;
+}
+
+static double	
+b2d(Bigint *a, int *e)
+{
+	unsigned int * xa, *xa0, w, y, z;
+	int	k;
+	double	d;
+#define d0 fpword0(d)
+#define d1 fpword1(d)
+
+	xa0 = a->x;
+	xa = xa0 + a->wds;
+	y = *--xa;
+	k = hi0bits(y);
+	*e = 32 - k;
+	if (k < Ebits) {
+		d0 = Exp_1 | y >> Ebits - k;
+		w = xa > xa0 ? *--xa : 0;
+		d1 = y << (32 - Ebits) + k | w >> Ebits - k;
+		goto ret_d;
+	}
+	z = xa > xa0 ? *--xa : 0;
+	if (k -= Ebits) {
+		d0 = Exp_1 | y << k | z >> 32 - k;
+		y = xa > xa0 ? *--xa : 0;
+		d1 = z << k | y >> 32 - k;
+	} else {
+		d0 = Exp_1 | y;
+		d1 = z;
+	}
+ret_d:
+#undef d0
+#undef d1
+	return d;
+}
+
+static Bigint *
+d2b(double d, int *e, int *bits)
+{
+	Bigint * b;
+	int	de, i, k;
+	unsigned int * x, y, z;
+#define d0 fpword0(d)
+#define d1 fpword1(d)
+
+	b = Balloc(1);
+	x = b->x;
+
+	z = d0 & Frac_mask;
+	d0 &= 0x7fffffff;	/* clear sign bit, which we ignore */
+	de = (int)(d0 >> Exp_shift);
+	z |= Exp_msk11;
+	if (y = d1) {
+		if (k = lo0bits(&y)) {
+			x[0] = y | z << 32 - k;
+			z >>= k;
+		} else
+			x[0] = y;
+		i = b->wds = (x[1] = z) ? 2 : 1;
+	} else {
+		k = lo0bits(&z);
+		x[0] = z;
+		i = b->wds = 1;
+		k += 32;
+	}
+	*e = de - Bias - (P - 1) + k;
+	*bits = P - k;
+	return b;
+}
+
+#undef d0
+#undef d1
+
+static double	
+ratio(Bigint *a, Bigint *b)
+{
+	double	da, db;
+	int	k, ka, kb;
+
+	da = b2d(a, &ka);
+	db = b2d(b, &kb);
+	k = ka - kb + 32 * (a->wds - b->wds);
+	if (k > 0)
+		fpword0(da) += k * Exp_msk1;
+	else {
+		k = -k;
+		fpword0(db) += k * Exp_msk1;
+	}
+	return da / db;
+}
+
+static const double
+tens[] = {
+	1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9,
+	1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19,
+	1e20, 1e21, 1e22
+};
+
+static const double
+bigtens[] = { 
+	1e16, 1e32, 1e64, 1e128, 1e256 };
+
+static const double tinytens[] = { 
+	1e-16, 1e-32, 1e-64, 1e-128,
+	9007199254740992.e-256
+};
+
+/* The factor of 2^53 in tinytens[4] helps us avoid setting the underflow */
+/* flag unnecessarily.  It leads to a song and dance at the end of strtod. */
+#define Scale_Bit 0x10
+#define n_bigtens 5
+
+#define NAN_WORD0 0x7ff80000
+
+#define NAN_WORD1 0
+
+static int	
+match(const char **sp, char *t)
+{
+	int	c, d;
+	const char * s = *sp;
+
+	while (d = *t++) {
+		if ((c = *++s) >= 'A' && c <= 'Z')
+			c += 'a' - 'A';
+		if (c != d)
+			return 0;
+	}
+	*sp = s + 1;
+	return 1;
+}
+
+static void	
+gethex(double *rvp, const char **sp)
+{
+	unsigned int c, x[2];
+	const char * s;
+	int	havedig, udx0, xshift;
+
+	x[0] = x[1] = 0;
+	havedig = xshift = 0;
+	udx0 = 1;
+	s = *sp;
+	while (c = *(const unsigned char * )++s) {
+		if (c >= '0' && c <= '9')
+			c -= '0';
+		else if (c >= 'a' && c <= 'f')
+			c += 10 - 'a';
+		else if (c >= 'A' && c <= 'F')
+			c += 10 - 'A';
+		else if (c <= ' ') {
+			if (udx0 && havedig) {
+				udx0 = 0;
+				xshift = 1;
+			}
+			continue;
+		} else if (/*(*/ c == ')') {
+			*sp = s + 1;
+			break;
+		} else
+			return;	/* invalid form: don't change *sp */
+		havedig = 1;
+		if (xshift) {
+			xshift = 0;
+			x[0] = x[1];
+			x[1] = 0;
+		}
+		if (udx0)
+			x[0] = (x[0] << 4) | (x[1] >> 28);
+		x[1] = (x[1] << 4) | c;
+	}
+	if ((x[0] &= 0xfffff) || x[1]) {
+		fpword0(*rvp) = Exp_mask | x[0];
+		fpword1(*rvp) = x[1];
+	}
+}
+
+static int	
+quorem(Bigint *b, Bigint *S)
+{
+	int	n;
+	unsigned int * bx, *bxe, q, *sx, *sxe;
+	unsigned int borrow, carry, y, ys;
+	unsigned int si, z, zs;
+
+	n = S->wds;
+	if (b->wds < n)
+		return 0;
+	sx = S->x;
+	sxe = sx + --n;
+	bx = b->x;
+	bxe = bx + n;
+	q = *bxe / (*sxe + 1);	/* ensure q <= true quotient */
+	if (q) {
+		borrow = 0;
+		carry = 0;
+		do {
+			si = *sx++;
+			ys = (si & 0xffff) * q + carry;
+			zs = (si >> 16) * q + (ys >> 16);
+			carry = zs >> 16;
+			y = (*bx & 0xffff) - (ys & 0xffff) - borrow;
+			borrow = (y & 0x10000) >> 16;
+			z = (*bx >> 16) - (zs & 0xffff) - borrow;
+			borrow = (z & 0x10000) >> 16;
+			Storeinc(bx, z, y);
+		} while (sx <= sxe);
+		if (!*bxe) {
+			bx = b->x;
+			while (--bxe > bx && !*bxe)
+				--n;
+			b->wds = n;
+		}
+	}
+	if (cmp(b, S) >= 0) {
+		q++;
+		borrow = 0;
+		carry = 0;
+		bx = b->x;
+		sx = S->x;
+		do {
+			si = *sx++;
+			ys = (si & 0xffff) + carry;
+			zs = (si >> 16) + (ys >> 16);
+			carry = zs >> 16;
+			y = (*bx & 0xffff) - (ys & 0xffff) - borrow;
+			borrow = (y & 0x10000) >> 16;
+			z = (*bx >> 16) - (zs & 0xffff) - borrow;
+			borrow = (z & 0x10000) >> 16;
+			Storeinc(bx, z, y);
+		} while (sx <= sxe);
+		bx = b->x;
+		bxe = bx + n;
+		if (!*bxe) {
+			while (--bxe > bx && !*bxe)
+				--n;
+			b->wds = n;
+		}
+	}
+	return q;
+}
+
+static char	*
+rv_alloc(int i)
+{
+	int	j, k, *r;
+
+	j = sizeof(unsigned int);
+	for (k = 0; 
+	    sizeof(Bigint) - sizeof(unsigned int) - sizeof(int) + j <= i; 
+	    j <<= 1)
+		k++;
+	r = (int * )Balloc(k);
+	*r = k;
+	return
+	    (char *)(r + 1);
+}
+
+static char	*
+nrv_alloc(char *s, char **rve, int n)
+{
+	char	*rv, *t;
+
+	t = rv = rv_alloc(n);
+	while (*t = *s++) 
+		t++;
+	if (rve)
+		*rve = t;
+	return rv;
+}
+
+/* freedtoa(s) must be used to free values s returned by dtoa
+ * when MULTIPLE_THREADS is #defined.  It should be used in all cases,
+ * but for consistency with earlier versions of dtoa, it is optional
+ * when MULTIPLE_THREADS is not defined.
+ */
+
+void
+freedtoa(char *s)
+{
+	Bigint * b = (Bigint * )((int *)s - 1);
+	b->maxwds = 1 << (b->k = *(int * )b);
+	Bfree(b);
+}
+
+/* dtoa for IEEE arithmetic (dmg): convert double to ASCII string.
+ *
+ * Inspired by "How to Print Floating-Point Numbers Accurately" by
+ * Guy L. Steele, Jr. and Jon L. White [Proc. ACM SIGPLAN '90, pp. 92-101].
+ *
+ * Modifications:
+ *	1. Rather than iterating, we use a simple numeric overestimate
+ *	   to determine k = floor(log10(d)).  We scale relevant
+ *	   quantities using O(log2(k)) rather than O(k) multiplications.
+ *	2. For some modes > 2 (corresponding to ecvt and fcvt), we don't
+ *	   try to generate digits strictly left to right.  Instead, we
+ *	   compute with fewer bits and propagate the carry if necessary
+ *	   when rounding the final digit up.  This is often faster.
+ *	3. Under the assumption that input will be rounded nearest,
+ *	   mode 0 renders 1e23 as 1e23 rather than 9.999999999999999e22.
+ *	   That is, we allow equality in stopping tests when the
+ *	   round-nearest rule will give the same floating-point value
+ *	   as would satisfaction of the stopping test with strict
+ *	   inequality.
+ *	4. We remove common factors of powers of 2 from relevant
+ *	   quantities.
+ *	5. When converting floating-point integers less than 1e16,
+ *	   we use floating-point arithmetic rather than resorting
+ *	   to multiple-precision integers.
+ *	6. When asked to produce fewer than 15 digits, we first try
+ *	   to get by with floating-point arithmetic; we resort to
+ *	   multiple-precision integer arithmetic only if we cannot
+ *	   guarantee that the floating-point calculation has given
+ *	   the correctly rounded result.  For k requested digits and
+ *	   "uniformly" distributed input, the probability is
+ *	   something like 10^(k-15) that we must resort to the int
+ *	   calculation.
+ */
+
+char	*
+dtoa(double d, int mode, int ndigits, int *decpt, int *sign, char **rve)
+{
+	/*	Arguments ndigits, decpt, sign are similar to those
+	of ecvt and fcvt; trailing zeros are suppressed from
+	the returned string.  If not null, *rve is set to point
+	to the end of the return value.  If d is +-Infinity or NaN,
+	then *decpt is set to 9999.
+
+	mode:
+		0 ==> shortest string that yields d when read in
+			and rounded to nearest.
+		1 ==> like 0, but with Steele & White stopping rule;
+			e.g. with IEEE P754 arithmetic , mode 0 gives
+			1e23 whereas mode 1 gives 9.999999999999999e22.
+		2 ==> max(1,ndigits) significant digits.  This gives a
+			return value similar to that of ecvt, except
+			that trailing zeros are suppressed.
+		3 ==> through ndigits past the decimal point.  This
+			gives a return value similar to that from fcvt,
+			except that trailing zeros are suppressed, and
+			ndigits can be negative.
+		4-9 should give the same return values as 2-3, i.e.,
+			4 <= mode <= 9 ==> same return as mode
+			2 + (mode & 1).  These modes are mainly for
+			debugging; often they run slower but sometimes
+			faster than modes 2-3.
+		4,5,8,9 ==> left-to-right digit generation.
+		6-9 ==> don't try fast floating-point estimate
+			(if applicable).
+
+		Values of mode other than 0-9 are treated as mode 0.
+
+		Sufficient space is allocated to the return value
+		to hold the suppressed trailing zeros.
+	*/
+
+	int	bbits, b2, b5, be, dig, i, ieps, ilim, ilim0, ilim1,
+	j, j1, k, k0, k_check, leftright, m2, m5, s2, s5,
+	spec_case, try_quick;
+	int L;
+	Bigint * b, *b1, *delta, *mlo=nil, *mhi, *S;
+	double	d2, ds, eps;
+	char	*s, *s0;
+
+	if (fpword0(d) & Sign_bit) {
+		/* set sign for everything, including 0's and NaNs */
+		*sign = 1;
+		fpword0(d) &= ~Sign_bit;	/* clear sign bit */
+	} else
+		*sign = 0;
+
+	if ((fpword0(d) & Exp_mask) == Exp_mask) {
+		/* Infinity or NaN */
+		*decpt = 9999;
+		if (!fpword1(d) && !(fpword0(d) & 0xfffff))
+			return nrv_alloc("Infinity", rve, 8);
+		return nrv_alloc("NaN", rve, 3);
+	}
+	if (!d) {
+		*decpt = 1;
+		return nrv_alloc("0", rve, 1);
+	}
+
+	b = d2b(d, &be, &bbits);
+	i = (int)(fpword0(d) >> Exp_shift1 & (Exp_mask >> Exp_shift1));
+	d2 = d;
+	fpword0(d2) &= Frac_mask1;
+	fpword0(d2) |= Exp_11;
+
+	/* log(x)	~=~ log(1.5) + (x-1.5)/1.5
+		 * log10(x)	 =  log(x) / log(10)
+		 *		~=~ log(1.5)/log(10) + (x-1.5)/(1.5*log(10))
+		 * log10(d) = (i-Bias)*log(2)/log(10) + log10(d2)
+		 *
+		 * This suggests computing an approximation k to log10(d) by
+		 *
+		 * k = (i - Bias)*0.301029995663981
+		 *	+ ( (d2-1.5)*0.289529654602168 + 0.176091259055681 );
+		 *
+		 * We want k to be too large rather than too small.
+		 * The error in the first-order Taylor series approximation
+		 * is in our favor, so we just round up the constant enough
+		 * to compensate for any error in the multiplication of
+		 * (i - Bias) by 0.301029995663981; since |i - Bias| <= 1077,
+		 * and 1077 * 0.30103 * 2^-52 ~=~ 7.2e-14,
+		 * adding 1e-13 to the constant term more than suffices.
+		 * Hence we adjust the constant term to 0.1760912590558.
+		 * (We could get a more accurate k by invoking log10,
+		 *  but this is probably not worthwhile.)
+		 */
+
+	i -= Bias;
+	ds = (d2 - 1.5) * 0.289529654602168 + 0.1760912590558 + i * 0.301029995663981;
+	k = (int)ds;
+	if (ds < 0. && ds != k)
+		k--;	/* want k = floor(ds) */
+	k_check = 1;
+	if (k >= 0 && k <= Ten_pmax) {
+		if (d < tens[k])
+			k--;
+		k_check = 0;
+	}
+	j = bbits - i - 1;
+	if (j >= 0) {
+		b2 = 0;
+		s2 = j;
+	} else {
+		b2 = -j;
+		s2 = 0;
+	}
+	if (k >= 0) {
+		b5 = 0;
+		s5 = k;
+		s2 += k;
+	} else {
+		b2 -= k;
+		b5 = -k;
+		s5 = 0;
+	}
+	if (mode < 0 || mode > 9)
+		mode = 0;
+	try_quick = 1;
+	if (mode > 5) {
+		mode -= 4;
+		try_quick = 0;
+	}
+	leftright = 1;
+	switch (mode) {
+	case 0:
+	case 1:
+		ilim = ilim1 = -1;
+		i = 18;
+		ndigits = 0;
+		break;
+	case 2:
+		leftright = 0;
+		/* no break */
+	case 4:
+		if (ndigits <= 0)
+			ndigits = 1;
+		ilim = ilim1 = i = ndigits;
+		break;
+	case 3:
+		leftright = 0;
+		/* no break */
+	case 5:
+		i = ndigits + k + 1;
+		ilim = i;
+		ilim1 = i - 1;
+		if (i <= 0)
+			i = 1;
+	}
+	s = s0 = rv_alloc(i);
+
+	if (ilim >= 0 && ilim <= Quick_max && try_quick) {
+
+		/* Try to get by with floating-point arithmetic. */
+
+		i = 0;
+		d2 = d;
+		k0 = k;
+		ilim0 = ilim;
+		ieps = 2; /* conservative */
+		if (k > 0) {
+			ds = tens[k&0xf];
+			j = k >> 4;
+			if (j & Bletch) {
+				/* prevent overflows */
+				j &= Bletch - 1;
+				d /= bigtens[n_bigtens-1];
+				ieps++;
+			}
+			for (; j; j >>= 1, i++)
+				if (j & 1) {
+					ieps++;
+					ds *= bigtens[i];
+				}
+			d /= ds;
+		} else if (j1 = -k) {
+			d *= tens[j1 & 0xf];
+			for (j = j1 >> 4; j; j >>= 1, i++)
+				if (j & 1) {
+					ieps++;
+					d *= bigtens[i];
+				}
+		}
+		if (k_check && d < 1. && ilim > 0) {
+			if (ilim1 <= 0)
+				goto fast_failed;
+			ilim = ilim1;
+			k--;
+			d *= 10.;
+			ieps++;
+		}
+		eps = ieps * d + 7.;
+		fpword0(eps) -= (P - 1) * Exp_msk1;
+		if (ilim == 0) {
+			S = mhi = 0;
+			d -= 5.;
+			if (d > eps)
+				goto one_digit;
+			if (d < -eps)
+				goto no_digits;
+			goto fast_failed;
+		}
+		/* Generate ilim digits, then fix them up. */
+		eps *= tens[ilim-1];
+		for (i = 1; ; i++, d *= 10.) {
+			L = d;
+			d -= L;
+			*s++ = '0' + (int)L;
+			if (i == ilim) {
+				if (d > 0.5 + eps)
+					goto bump_up;
+				else if (d < 0.5 - eps) {
+					while (*--s == '0')
+						;
+					s++;
+					goto ret1;
+				}
+				break;
+			}
+		}
+fast_failed:
+		s = s0;
+		d = d2;
+		k = k0;
+		ilim = ilim0;
+	}
+
+	/* Do we have a "small" integer? */
+
+	if (be >= 0 && k <= Int_max) {
+		/* Yes. */
+		ds = tens[k];
+		if (ndigits < 0 && ilim <= 0) {
+			S = mhi = 0;
+			if (ilim < 0 || d <= 5 * ds)
+				goto no_digits;
+			goto one_digit;
+		}
+		for (i = 1; ; i++) {
+			L = d / ds;
+			d -= L * ds;
+			*s++ = '0' + (int)L;
+			if (i == ilim) {
+				d += d;
+				if (d > ds || d == ds && L & 1) {
+bump_up:
+					while (*--s == '9')
+						if (s == s0) {
+							k++;
+							*s = '0';
+							break;
+						}
+					++ * s++;
+				}
+				break;
+			}
+			if (!(d *= 10.))
+				break;
+		}
+		goto ret1;
+	}
+
+	m2 = b2;
+	m5 = b5;
+	mhi = mlo = 0;
+	if (leftright) {
+		if (mode < 2) {
+			i = 
+			    1 + P - bbits;
+		} else {
+			j = ilim - 1;
+			if (m5 >= j)
+				m5 -= j;
+			else {
+				s5 += j -= m5;
+				b5 += j;
+				m5 = 0;
+			}
+			if ((i = ilim) < 0) {
+				m2 -= i;
+				i = 0;
+			}
+		}
+		b2 += i;
+		s2 += i;
+		mhi = i2b(1);
+	}
+	if (m2 > 0 && s2 > 0) {
+		i = m2 < s2 ? m2 : s2;
+		b2 -= i;
+		m2 -= i;
+		s2 -= i;
+	}
+	if (b5 > 0) {
+		if (leftright) {
+			if (m5 > 0) {
+				mhi = pow5mult(mhi, m5);
+				b1 = mult(mhi, b);
+				Bfree(b);
+				b = b1;
+			}
+			if (j = b5 - m5)
+				b = pow5mult(b, j);
+		} else
+			b = pow5mult(b, b5);
+	}
+	S = i2b(1);
+	if (s5 > 0)
+		S = pow5mult(S, s5);
+
+	/* Check for special case that d is a normalized power of 2. */
+
+	spec_case = 0;
+	if (mode < 2) {
+		if (!fpword1(d) && !(fpword0(d) & Bndry_mask)
+		    ) {
+			/* The special case */
+			b2 += Log2P;
+			s2 += Log2P;
+			spec_case = 1;
+		}
+	}
+
+	/* Arrange for convenient computation of quotients:
+	 * shift left if necessary so divisor has 4 leading 0 bits.
+	 *
+	 * Perhaps we should just compute leading 28 bits of S once
+	 * and for all and pass them and a shift to quorem, so it
+	 * can do shifts and ors to compute the numerator for q.
+	 */
+	if (i = ((s5 ? 32 - hi0bits(S->x[S->wds-1]) : 1) + s2) & 0x1f)
+		i = 32 - i;
+	if (i > 4) {
+		i -= 4;
+		b2 += i;
+		m2 += i;
+		s2 += i;
+	} else if (i < 4) {
+		i += 28;
+		b2 += i;
+		m2 += i;
+		s2 += i;
+	}
+	if (b2 > 0)
+		b = lshift(b, b2);
+	if (s2 > 0)
+		S = lshift(S, s2);
+	if (k_check) {
+		if (cmp(b, S) < 0) {
+			k--;
+			b = multadd(b, 10, 0);	/* we botched the k estimate */
+			if (leftright)
+				mhi = multadd(mhi, 10, 0);
+			ilim = ilim1;
+		}
+	}
+	if (ilim <= 0 && mode > 2) {
+		if (ilim < 0 || cmp(b, S = multadd(S, 5, 0)) <= 0) {
+			/* no digits, fcvt style */
+no_digits:
+			k = -1 - ndigits;
+			goto ret;
+		}
+one_digit:
+		*s++ = '1';
+		k++;
+		goto ret;
+	}
+	if (leftright) {
+		if (m2 > 0)
+			mhi = lshift(mhi, m2);
+
+		/* Compute mlo -- check for special case
+		 * that d is a normalized power of 2.
+		 */
+
+		mlo = mhi;
+		if (spec_case) {
+			mhi = Balloc(mhi->k);
+			Bcopy(mhi, mlo);
+			mhi = lshift(mhi, Log2P);
+		}
+
+		for (i = 1; ; i++) {
+			dig = quorem(b, S) + '0';
+			/* Do we yet have the shortest decimal string
+			 * that will round to d?
+			 */
+			j = cmp(b, mlo);
+			delta = diff(S, mhi);
+			j1 = delta->sign ? 1 : cmp(b, delta);
+			Bfree(delta);
+			if (j1 == 0 && !mode && !(fpword1(d) & 1)) {
+				if (dig == '9')
+					goto round_9_up;
+				if (j > 0)
+					dig++;
+				*s++ = dig;
+				goto ret;
+			}
+			if (j < 0 || j == 0 && !mode
+			     && !(fpword1(d) & 1)
+			    ) {
+				if (j1 > 0) {
+					b = lshift(b, 1);
+					j1 = cmp(b, S);
+					if ((j1 > 0 || j1 == 0 && dig & 1)
+					     && dig++ == '9')
+						goto round_9_up;
+				}
+				*s++ = dig;
+				goto ret;
+			}
+			if (j1 > 0) {
+				if (dig == '9') { /* possible if i == 1 */
+round_9_up:
+					*s++ = '9';
+					goto roundoff;
+				}
+				*s++ = dig + 1;
+				goto ret;
+			}
+			*s++ = dig;
+			if (i == ilim)
+				break;
+			b = multadd(b, 10, 0);
+			if (mlo == mhi)
+				mlo = mhi = multadd(mhi, 10, 0);
+			else {
+				mlo = multadd(mlo, 10, 0);
+				mhi = multadd(mhi, 10, 0);
+			}
+		}
+	} else
+		for (i = 1; ; i++) {
+			*s++ = dig = quorem(b, S) + '0';
+			if (i >= ilim)
+				break;
+			b = multadd(b, 10, 0);
+		}
+
+	/* Round off last digit */
+
+	b = lshift(b, 1);
+	j = cmp(b, S);
+	if (j > 0 || j == 0 && dig & 1) {
+roundoff:
+		while (*--s == '9')
+			if (s == s0) {
+				k++;
+				*s++ = '1';
+				goto ret;
+			}
+		++ * s++;
+	} else {
+		while (*--s == '0')
+			;
+		s++;
+	}
+ret:
+	Bfree(S);
+	if (mhi) {
+		if (mlo && mlo != mhi)
+			Bfree(mlo);
+		Bfree(mhi);
+	}
+ret1:
+	Bfree(b);
+	*s = 0;
+	*decpt = k + 1;
+	if (rve)
+		*rve = s;
+	return s0;
+}
+
diff --git a/sys/src/libstdio/fclose.c b/sys/src/libstdio/fclose.c
new file mode 100755
index 000000000..9f01825e4
--- /dev/null
+++ b/sys/src/libstdio/fclose.c
@@ -0,0 +1,14 @@
+/*
+ * pANS stdio -- fclose
+ */
+#include "iolib.h"
+int fclose(FILE *f){
+	int error=0;
+	if(f->state==CLOSED) return EOF;
+	if(fflush(f)==EOF) error=EOF;
+	if(f->flags&BALLOC) free(f->buf);
+	if(!(f->flags&STRING) && close(f->fd)<0) error=EOF;
+	f->state=CLOSED;
+	f->flags=0;
+	return error;
+}
diff --git a/sys/src/libstdio/fdopen.c b/sys/src/libstdio/fdopen.c
new file mode 100755
index 000000000..c2b5034fe
--- /dev/null
+++ b/sys/src/libstdio/fdopen.c
@@ -0,0 +1,37 @@
+/*
+ * Posix stdio -- fdopen
+ */
+#include "iolib.h"
+/*
+ * Open the named file with the given mode, using the given FILE
+ * Legal modes are given below, `additional characters may follow these sequences':
+ * r rb		open to read
+ * w wb		open to write, truncating
+ * a ab		open to write positioned at eof, creating if non-existant
+ * r+ r+b rb+	open to read and write, creating if non-existant
+ * w+ w+b wb+	open to read and write, truncating
+ * a+ a+b ab+	open to read and write, positioned at eof, creating if non-existant.
+ */
+FILE *fdopen(const int fd, const char *mode){
+	FILE *f;	
+	qlock(&_stdiolk);
+	for(f=_IO_stream;f!=&_IO_stream[FOPEN_MAX];f++)
+		if(f->state==CLOSED)
+			break;
+	if(f==&_IO_stream[FOPEN_MAX]) {
+		qunlock(&_stdiolk);
+		return NULL;
+	}
+	f->fd=fd;
+	if(mode[0]=='a')
+		seek(f->fd, 0L, 2);
+	if(f->fd==-1) return NULL;
+	f->flags=0;
+	f->state=OPEN;
+	f->buf=0;
+	f->rp=0;
+	f->wp=0;
+	f->lp=0;
+	qunlock(&_stdiolk);
+	return f;
+}
diff --git a/sys/src/libstdio/feof.c b/sys/src/libstdio/feof.c
new file mode 100755
index 000000000..9c2ce9077
--- /dev/null
+++ b/sys/src/libstdio/feof.c
@@ -0,0 +1,7 @@
+/*
+ * pANS stdio -- feof
+ */
+#include "iolib.h"
+int feof(FILE *f){
+	return f->state==END;
+}
diff --git a/sys/src/libstdio/ferror.c b/sys/src/libstdio/ferror.c
new file mode 100755
index 000000000..0c705c5d8
--- /dev/null
+++ b/sys/src/libstdio/ferror.c
@@ -0,0 +1,7 @@
+/*
+ * pANS stdio -- ferror
+ */
+#include "iolib.h"
+int ferror(FILE *f){
+	return f->state==ERR;
+}
diff --git a/sys/src/libstdio/fflush.c b/sys/src/libstdio/fflush.c
new file mode 100755
index 000000000..a5a5f0b3c
--- /dev/null
+++ b/sys/src/libstdio/fflush.c
@@ -0,0 +1,52 @@
+/*
+ * pANS stdio -- fflush
+ */
+#include "iolib.h"
+/*
+ * pANS stdio -- data (put here, since loader won't load a separate file)
+ */
+FILE _IO_stream[]={
+/*	fd	flags	state	buf	rp	wp	lp	bufl	unbuf */
+	0,	0,	OPEN,	0,	0,	0,	0,	0,	0,
+	1,	0,	OPEN,	0,	0,	0,	0,	0,	0,
+	2,	0,	OPEN,	0,	0,	0,	0,	0,	0,
+};
+
+int _fflush(FILE *f){
+	int error, cnt;
+
+	if(f==NULL){
+		error=0;
+		for(f=_IO_stream;f!=&_IO_stream[FOPEN_MAX];f++)
+			if(f->state==WR && _fflush(f)==EOF)
+				error=EOF;
+		return error;
+	}
+	if(f->flags&STRING) return EOF;
+	switch(f->state){
+	default:	/* OPEN RDWR EOF RD */
+		return 0;
+	case CLOSED:
+	case ERR:
+		return EOF;
+	case WR:
+		cnt=(f->flags&LINEBUF?f->lp:f->wp)-f->buf;
+		if(cnt && write(f->fd, f->buf, cnt)!=cnt){
+			f->state=ERR;
+			return EOF;
+		}
+		f->rp=f->wp=f->buf;
+		f->state=RDWR;
+		return 0;
+	}
+}
+
+int fflush(FILE *f)
+{
+	int r;
+
+	qlock(&_stdiolk);
+	r = _fflush(f);
+	qunlock(&_stdiolk);
+	return r;
+}
diff --git a/sys/src/libstdio/fgetc.c b/sys/src/libstdio/fgetc.c
new file mode 100755
index 000000000..08c5ad03b
--- /dev/null
+++ b/sys/src/libstdio/fgetc.c
@@ -0,0 +1,7 @@
+/*
+ * pANS stdio -- fgetc
+ */
+#include "iolib.h"
+int fgetc(FILE *f){
+	return getc(f);
+}
diff --git a/sys/src/libstdio/fgetpos.c b/sys/src/libstdio/fgetpos.c
new file mode 100755
index 000000000..c8edc57b1
--- /dev/null
+++ b/sys/src/libstdio/fgetpos.c
@@ -0,0 +1,8 @@
+/*
+ * pANS stdio -- fgetpos
+ */
+#include "iolib.h"
+int fgetpos(FILE *f, fpos_t *pos){
+	*pos=ftell(f);
+	return *pos==-1?-1:0;
+}
diff --git a/sys/src/libstdio/fgets.c b/sys/src/libstdio/fgets.c
new file mode 100755
index 000000000..1643b5b46
--- /dev/null
+++ b/sys/src/libstdio/fgets.c
@@ -0,0 +1,18 @@
+/*
+ * pANS stdio -- fgets
+ */
+#include "iolib.h"
+char *fgets(char *as, int n, FILE *f){
+	int c;
+	char *s=as;
+	c = EOF;
+	while(n>1 && (c=getc(f))!=EOF){
+		*s++=c;
+		--n;
+		if(c=='\n') break;
+	}
+	if(c==EOF && s==as
+	|| ferror(f)) return NULL;
+	if(n) *s='\0';
+	return as;
+}
diff --git a/sys/src/libstdio/fileno.c b/sys/src/libstdio/fileno.c
new file mode 100755
index 000000000..2dd6fdb85
--- /dev/null
+++ b/sys/src/libstdio/fileno.c
@@ -0,0 +1,10 @@
+/*
+ * Posix stdio -- fileno
+ */
+#include "iolib.h"
+int fileno(FILE *f){
+	if(f==NULL)
+		return -1;
+	else
+		return f->fd;
+}
diff --git a/sys/src/libstdio/fopen.c b/sys/src/libstdio/fopen.c
new file mode 100755
index 000000000..3500fe805
--- /dev/null
+++ b/sys/src/libstdio/fopen.c
@@ -0,0 +1,16 @@
+/*
+ * pANS stdio -- fopen
+ */
+#include "iolib.h"
+FILE *fopen(const char *name, const char *mode){
+	FILE *f;
+	qlock(&_stdiolk);
+	for(f=_IO_stream;f!=&_IO_stream[FOPEN_MAX];f++) {
+		if(f->state==CLOSED) {
+			qunlock(&_stdiolk);
+			return freopen(name, mode, f);
+		}
+	}
+	qunlock(&_stdiolk);
+	return NULL;
+}
diff --git a/sys/src/libstdio/fprintf.c b/sys/src/libstdio/fprintf.c
new file mode 100755
index 000000000..9f3a861cc
--- /dev/null
+++ b/sys/src/libstdio/fprintf.c
@@ -0,0 +1,12 @@
+/*
+ * pANS stdio -- fprintf
+ */
+#include "iolib.h"
+int fprintf(FILE *f, const char *fmt, ...){
+	int n;
+	va_list args;
+	va_start(args, fmt);
+	n=vfprintf(f, fmt, args);
+	va_end(args);
+	return n;
+}
diff --git a/sys/src/libstdio/fputc.c b/sys/src/libstdio/fputc.c
new file mode 100755
index 000000000..0a482e20c
--- /dev/null
+++ b/sys/src/libstdio/fputc.c
@@ -0,0 +1,7 @@
+/*
+ * pANS stdio -- fputc
+ */
+#include "iolib.h"
+int fputc(int c, FILE *f){
+	return putc(c, f);	/* This can be made more fair to _IOLBF-mode streams */
+}
diff --git a/sys/src/libstdio/fputs.c b/sys/src/libstdio/fputs.c
new file mode 100755
index 000000000..d0406b0e5
--- /dev/null
+++ b/sys/src/libstdio/fputs.c
@@ -0,0 +1,8 @@
+/*
+ * pANS stdio -- fputs
+ */
+#include "iolib.h"
+int fputs(const char *s, FILE *f){
+	while(*s) putc(*s++, f);
+	return ferror(f)?EOF:0;
+}
diff --git a/sys/src/libstdio/fread.c b/sys/src/libstdio/fread.c
new file mode 100755
index 000000000..d2759638d
--- /dev/null
+++ b/sys/src/libstdio/fread.c
@@ -0,0 +1,41 @@
+/*
+ * pANS stdio -- fread
+ */
+#include "iolib.h"
+
+#define BIGN (BUFSIZ/2)
+
+long fread(void *p, long recl, long nrec, FILE *f){
+	char *s;
+	int n, d, c;
+
+	s=(char *)p;
+	n=recl*nrec;
+	while(n>0){
+		d=f->wp-f->rp;
+		if(d>0){
+			if(d>n)
+				d=n;
+			memmove(s, f->rp, d);
+			f->rp+=d;
+		}else{
+			if(n >= BIGN && f->state==RD && !(f->flags&STRING) && f->buf!=f->unbuf){
+				d=read(f->fd, s, n);
+				if(d<=0){
+					f->state=(d==0)?END:ERR;
+					goto ret;
+				}
+			}else{
+ 				c=_IO_getc(f);
+				if(c==EOF)
+					goto ret;
+				*s=c;
+				d=1;
+			}
+		}
+		s+=d;
+		n-=d;
+	}
+    ret:
+	return (s-(char *)p)/(recl?recl:1);
+}
diff --git a/sys/src/libstdio/freopen.c b/sys/src/libstdio/freopen.c
new file mode 100755
index 000000000..a5ac25993
--- /dev/null
+++ b/sys/src/libstdio/freopen.c
@@ -0,0 +1,56 @@
+/*
+ * pANS stdio -- freopen
+ */
+#include "iolib.h"
+/*
+ * Open the named file with the given mode, using the given FILE
+ * Legal modes are given below, `additional characters may follow these sequences':
+ * r rb		open to read
+ * w wb		open to write, truncating
+ * a ab		open to write positioned at eof, creating if non-existant
+ * r+ r+b rb+	open to read and write, creating if non-existant
+ * w+ w+b wb+	open to read and write, truncating
+ * a+ a+b ab+	open to read and write, positioned at eof, creating if non-existant.
+ */
+FILE *freopen(const char *name, const char *mode, FILE *f){
+	int m;
+
+	if(f->state!=CLOSED){
+		fclose(f);
+/* premature; fall through and see what happens */
+/*		f->state=OPEN; */
+	}
+
+	m = *mode++;
+	if(m == 0)
+		return NULL;
+	if(*mode == 'b')
+		mode++;
+	switch(m){
+	default:
+		return NULL;
+	case 'r':
+		f->fd=open(name, (*mode == '+'? ORDWR: OREAD));
+		break;
+	case 'w':
+		f->fd=create(name, (*mode == '+'? ORDWR: OWRITE), 0666);
+		break;
+	case 'a':
+		m = (*mode == '+'? ORDWR: OWRITE);
+		f->fd=open(name, m);
+		if(f->fd<0)
+			f->fd=create(name, m, 0666);
+		seek(f->fd, 0LL, 2);
+		break;
+	}
+
+	if(f->fd==-1)
+		return NULL;
+	f->flags=(mode[0]=='a')? APPEND : 0;
+	f->state=OPEN;
+	f->buf=0;
+	f->rp=0;
+	f->wp=0;
+	f->lp=0;
+	return f;
+}
diff --git a/sys/src/libstdio/fscanf.c b/sys/src/libstdio/fscanf.c
new file mode 100755
index 000000000..3d9d874e8
--- /dev/null
+++ b/sys/src/libstdio/fscanf.c
@@ -0,0 +1,12 @@
+/*
+ * pANS stdio -- fscanf
+ */
+#include "iolib.h"
+int fscanf(FILE *f, const char *fmt, ...){
+	int n;
+	va_list args;
+	va_start(args, fmt);
+	n=vfscanf(f, fmt, args);
+	va_end(args);
+	return n;
+}
diff --git a/sys/src/libstdio/fseek.c b/sys/src/libstdio/fseek.c
new file mode 100755
index 000000000..8a7a2a5fa
--- /dev/null
+++ b/sys/src/libstdio/fseek.c
@@ -0,0 +1,23 @@
+/*
+ * pANS stdio -- fseek
+ */
+#include "iolib.h"
+int fseek(FILE *f, long offs, int type){
+	switch(f->state){
+	case ERR:
+	case CLOSED:
+		return -1;
+	case WR:
+		fflush(f);
+		break;
+	case RD:
+		if(type==1 && f->buf!=f->unbuf)
+			offs-=f->wp-f->rp;
+		break;
+	}
+	if(f->flags&STRING || seek(f->fd, offs, type)==-1) return -1;
+	if(f->state==RD) f->rp=f->wp=f->buf;
+	if(f->state!=OPEN)
+		f->state=RDWR;
+	return 0;
+}
diff --git a/sys/src/libstdio/fseeko.c b/sys/src/libstdio/fseeko.c
new file mode 100755
index 000000000..48b627bc8
--- /dev/null
+++ b/sys/src/libstdio/fseeko.c
@@ -0,0 +1,23 @@
+/*
+ * pANS stdio -- fseeko
+ */
+#include "iolib.h"
+int fseeko(FILE *f, long long offs, int type){
+	switch(f->state){
+	case ERR:
+	case CLOSED:
+		return -1;
+	case WR:
+		fflush(f);
+		break;
+	case RD:
+		if(type==1 && f->buf!=f->unbuf)
+			offs-=f->wp-f->rp;
+		break;
+	}
+	if(f->flags&STRING || seek(f->fd, offs, type)==-1) return -1;
+	if(f->state==RD) f->rp=f->wp=f->buf;
+	if(f->state!=OPEN)
+		f->state=RDWR;
+	return 0;
+}
diff --git a/sys/src/libstdio/fsetpos.c b/sys/src/libstdio/fsetpos.c
new file mode 100755
index 000000000..540e83a7e
--- /dev/null
+++ b/sys/src/libstdio/fsetpos.c
@@ -0,0 +1,7 @@
+/*
+ * pANS stdio -- fsetpos
+ */
+#include "iolib.h"
+int fsetpos(FILE *f, const fpos_t *pos){
+	return fseek(f, *pos, SEEK_SET);
+}
diff --git a/sys/src/libstdio/ftell.c b/sys/src/libstdio/ftell.c
new file mode 100755
index 000000000..d5acbb373
--- /dev/null
+++ b/sys/src/libstdio/ftell.c
@@ -0,0 +1,16 @@
+/*
+ * pANS stdio -- ftell
+ */
+#include "iolib.h"
+long ftell(FILE *f){
+	long seekp=seek(f->fd, 0L, 1);
+	if(seekp<0) return -1;		/* enter error state? */
+	switch(f->state){
+	default:
+		return seekp;
+	case RD:
+		return seekp-(f->wp-f->rp);
+	case WR:
+		return (f->flags&LINEBUF?f->lp:f->wp)-f->buf+seekp;
+	}
+}
diff --git a/sys/src/libstdio/ftello.c b/sys/src/libstdio/ftello.c
new file mode 100755
index 000000000..2480856b9
--- /dev/null
+++ b/sys/src/libstdio/ftello.c
@@ -0,0 +1,16 @@
+/*
+ * pANS stdio -- ftello
+ */
+#include "iolib.h"
+long long ftello(FILE *f){
+	long long seekp=seek(f->fd, 0L, 1);
+	if(seekp<0) return -1;		/* enter error state? */
+	switch(f->state){
+	default:
+		return seekp;
+	case RD:
+		return seekp-(f->wp-f->rp);
+	case WR:
+		return (f->flags&LINEBUF?f->lp:f->wp)-f->buf+seekp;
+	}
+}
diff --git a/sys/src/libstdio/fwrite.c b/sys/src/libstdio/fwrite.c
new file mode 100755
index 000000000..d77679b22
--- /dev/null
+++ b/sys/src/libstdio/fwrite.c
@@ -0,0 +1,51 @@
+/*
+ * pANS stdio -- fwrite
+ */
+#include "iolib.h"
+
+#define BIGN (BUFSIZ/2)
+
+long fwrite(const void *p, long recl, long nrec, FILE *f){
+	char *s;
+	int n, d;
+
+	s=(char *)p;
+	n=recl*nrec;
+	while(n>0){
+		d=f->rp-f->wp;
+		if(d>0){
+			if(d>n)
+				d=n;
+			memmove(f->wp, s, d);
+			f->wp+=d;
+		}else{
+			if(n>=BIGN && f->state==WR && !(f->flags&(STRING|LINEBUF)) && f->buf!=f->unbuf){
+				d=f->wp-f->buf;
+				if(d>0){
+					if(f->flags&APPEND)
+						seek(f->fd, 0L, 2);
+					if(write(f->fd, f->buf, d)!=d){
+						f->state=ERR;
+						goto ret;
+					}
+					f->wp=f->rp=f->buf;
+				}
+				if(f->flags&APPEND)
+					seek(f->fd, 0L, 2);
+				d=write(f->fd, s, n);
+				if(d<=0){
+					f->state=ERR;
+					goto ret;
+				}
+			}else{
+				if(_IO_putc(*s, f)==EOF)
+					goto ret;
+				d=1;
+			}
+		}
+		s+=d;
+		n-=d;
+	}
+    ret:
+	return (s-(char *)p)/(recl?recl:1);
+}
diff --git a/sys/src/libstdio/getc.c b/sys/src/libstdio/getc.c
new file mode 100755
index 000000000..4096972bf
--- /dev/null
+++ b/sys/src/libstdio/getc.c
@@ -0,0 +1,8 @@
+/*
+ * pANS stdio -- getc
+ */
+#include "iolib.h"
+#undef getc
+int getc(FILE *f){
+	return fgetc(f);
+}
diff --git a/sys/src/libstdio/gets.c b/sys/src/libstdio/gets.c
new file mode 100755
index 000000000..909c21485
--- /dev/null
+++ b/sys/src/libstdio/gets.c
@@ -0,0 +1,17 @@
+/*
+ * pANS stdio -- gets
+ */
+#include "iolib.h"
+char *gets(char *as){
+#ifdef secure
+	stdin->flags|=ERR;
+	return NULL;
+#else
+	char *s=as;
+	int c;
+	while((c=getchar())!='\n' && c!=EOF) *s++=c;
+	if(c!=EOF || s!=as) *s='\0';
+	else return NULL;
+	return as;
+#endif
+}
diff --git a/sys/src/libstdio/iolib.h b/sys/src/libstdio/iolib.h
new file mode 100755
index 000000000..8748b5518
--- /dev/null
+++ b/sys/src/libstdio/iolib.h
@@ -0,0 +1,44 @@
+/*
+ * pANS stdio -- definitions
+ * The following names are defined in the pANS:
+ *	FILE	 	fpos_t		_IOFBF		_IOLBF		_IONBF
+ *	BUFSIZ		EOF		FOPEN_MAX	FILENAME_MAX	L_tmpnam
+ *	SEEK_CUR	SEEK_END	SEEK_SET	TMP_MAX		stderr
+ *	stdin		stdout		remove		rename		tmpfile
+ *	tmpnam		fclose		fflush		fopen		freopen
+ *	setbuf		setvbuf		fprintf		fscanf		printf
+ *	scanf		sprintf		sscanf		vfprintf	vprintf
+ *	vsprintf	fgetc		fgets		fputc		fputs
+ *	getc		getchar		gets		putc		putchar
+ *	puts		ungetc		fread		fwrite		fgetpos
+ *	fseek		fsetpos		ftell		rewind		clearerr
+ *	feof		ferror		perror	
+ *
+ * (But plan9 version omits remove and rename, because they are in libc)
+ */
+#include <u.h>
+#include <libc.h>
+#undef END
+#include "Stdio.h"
+/*
+ * Flag bits
+ */
+#define	BALLOC	1	/* did stdio malloc fd->buf? */
+#define	LINEBUF	2	/* is stream line buffered? */
+#define	STRING	4	/* output to string, instead of file */
+#define APPEND	8	/* append mode output */
+/*
+ * States
+ */
+#define	CLOSED	0	/* file not open */
+#define	OPEN	1	/* file open, but no I/O buffer allocated yet */
+#define	RDWR	2	/* open, buffer allocated, ok to read or write */
+#define	RD	3	/* open, buffer allocated, ok to read but not write */
+#define	WR	4	/* open, buffer allocated, ok to write but not read */
+#define	ERR	5	/* open, but an uncleared error occurred */
+#define	END	6	/* open, but at eof */
+
+int _IO_setvbuf(FILE *);
+
+/* half hearted attempt to make multi threaded */
+extern QLock _stdiolk;
diff --git a/sys/src/libstdio/mkfile b/sys/src/libstdio/mkfile
new file mode 100755
index 000000000..a3c0dbd6a
--- /dev/null
+++ b/sys/src/libstdio/mkfile
@@ -0,0 +1,69 @@
+</$objtype/mkfile
+
+LIB=/$objtype/lib/libstdio.a
+OFILES=\
+	_IO_getc.$O\
+	_IO_putc.$O\
+	clearerr.$O\
+	dtoa.$O\
+	fclose.$O\
+	fdopen.$O\
+	feof.$O\
+	ferror.$O\
+	fflush.$O\
+	fgetc.$O\
+	fgetpos.$O\
+	fgets.$O\
+	fileno.$O\
+	fopen.$O\
+	fprintf.$O\
+	fputc.$O\
+	fputs.$O\
+	fread.$O\
+	freopen.$O\
+	fscanf.$O\
+	fseek.$O\
+	fseeko.$O\
+	fsetpos.$O\
+	ftell.$O\
+	ftello.$O\
+	fwrite.$O\
+	getc.$O\
+	gets.$O\
+	printf.$O\
+	putc.$O\
+	puts.$O\
+	rewind.$O\
+	scanf.$O\
+	sclose.$O\
+	setbuf.$O\
+	setvbuf.$O\
+	snprintf.$O\
+	sopenr.$O\
+	sopenw.$O\
+	sprintf.$O\
+	sscanf.$O\
+	tmpfile.$O\
+	tmpnam.$O\
+	ungetc.$O\
+	vfprintf.$O\
+	vfscanf.$O\
+	vprintf.$O\
+	vsnprintf.$O\
+	vsprintf.$O\
+
+HFILES=/sys/include/stdio.h\
+	iolib.h\
+
+UPDATE=\
+	mkfile\
+	$HFILES\
+	${OFILES:%.$O=%.c}\
+	${LIB:/$objtype/%=/386/%}\
+
+</sys/src/cmd/mksyslib
+# this code really can't handle any flow-analysis warnings
+CFLAGS=
+
+test:V:	$OFILES
+	ar vu libstdio.a $OFILES
diff --git a/sys/src/libstdio/printf.c b/sys/src/libstdio/printf.c
new file mode 100755
index 000000000..8880b9d8d
--- /dev/null
+++ b/sys/src/libstdio/printf.c
@@ -0,0 +1,12 @@
+/*
+ * pANS stdio -- printf
+ */
+#include "iolib.h"
+int printf(const char *fmt, ...){
+	int n;
+	va_list args;
+	va_start(args, fmt);
+	n=vfprintf(stdout, fmt, args);
+	va_end(args);
+	return n;
+}
diff --git a/sys/src/libstdio/putc.c b/sys/src/libstdio/putc.c
new file mode 100755
index 000000000..9cffeeb01
--- /dev/null
+++ b/sys/src/libstdio/putc.c
@@ -0,0 +1,8 @@
+/*
+ * pANS stdio -- putc
+ */
+#include "iolib.h"
+#undef putc
+int putc(int c, FILE *f){
+	return fputc(c, f);
+}
diff --git a/sys/src/libstdio/puts.c b/sys/src/libstdio/puts.c
new file mode 100755
index 000000000..b25c4718d
--- /dev/null
+++ b/sys/src/libstdio/puts.c
@@ -0,0 +1,9 @@
+/*
+ * pANS stdio -- puts
+ */
+#include "iolib.h"
+int puts(const char *s){
+	fputs(s, stdout);
+	putchar('\n');
+	return ferror(stdin)?EOF:0;
+}
diff --git a/sys/src/libstdio/rewind.c b/sys/src/libstdio/rewind.c
new file mode 100755
index 000000000..0cfdb957c
--- /dev/null
+++ b/sys/src/libstdio/rewind.c
@@ -0,0 +1,7 @@
+/*
+ * pANS stdio -- rewind
+ */
+#include "iolib.h"
+void rewind(FILE *f){
+	fseek(f, 0L, SEEK_SET);
+}
diff --git a/sys/src/libstdio/scanf.c b/sys/src/libstdio/scanf.c
new file mode 100755
index 000000000..30a631cc9
--- /dev/null
+++ b/sys/src/libstdio/scanf.c
@@ -0,0 +1,12 @@
+/*
+ * pANS stdio -- scanf
+ */
+#include "iolib.h"
+int scanf(const char *fmt, ...){
+	int n;
+	va_list args;
+	va_start(args, fmt);
+	n=vfscanf(stdin, fmt, args);
+	va_end(args);
+	return n;
+}
diff --git a/sys/src/libstdio/sclose.c b/sys/src/libstdio/sclose.c
new file mode 100755
index 000000000..940b80227
--- /dev/null
+++ b/sys/src/libstdio/sclose.c
@@ -0,0 +1,34 @@
+/*
+ * pANS stdio -- sclose
+ */
+#include "iolib.h"
+char *sclose(FILE *f){
+	switch(f->state){
+	default:	/* ERR CLOSED */
+		if(f->buf && f->flags&BALLOC)
+			free(f->buf);
+		f->flags=0;
+		return NULL;
+	case OPEN:
+		f->buf=malloc(1);
+		f->buf[0]='\0';
+		break;
+	case RD:
+	case END:
+		f->flags=0;
+		break;
+	case RDWR:
+	case WR:
+		if(f->wp==f->rp){
+			if(f->flags&BALLOC)
+				f->buf=realloc(f->buf, f->bufl+1);
+			if(f->buf==NULL) return NULL;
+		}
+		*f->wp='\0';
+		f->flags=0;
+		break;
+	}
+	f->state=CLOSED;
+	f->flags=0;
+	return f->buf;
+}
diff --git a/sys/src/libstdio/setbuf.c b/sys/src/libstdio/setbuf.c
new file mode 100755
index 000000000..31c5d3e1e
--- /dev/null
+++ b/sys/src/libstdio/setbuf.c
@@ -0,0 +1,17 @@
+/*
+ * pANS stdio -- setbuf
+ */
+#include "iolib.h"
+void setbuf(FILE *f, char *buf){
+	if(f->state==OPEN){
+		if(buf)
+			f->bufl=BUFSIZ;
+		else{
+			buf=f->unbuf;
+			f->bufl=0;
+		}
+		f->rp=f->wp=f->lp=f->buf=buf;
+		f->state=RDWR;
+	}
+	/* else error, but there's no way to report it */
+}
diff --git a/sys/src/libstdio/setvbuf.c b/sys/src/libstdio/setvbuf.c
new file mode 100755
index 000000000..34c3bf7c8
--- /dev/null
+++ b/sys/src/libstdio/setvbuf.c
@@ -0,0 +1,50 @@
+/*
+ * pANS stdio -- setvbuf
+ */
+#include "iolib.h"
+int setvbuf(FILE *f, char *buf, int mode, long size){
+	if(f->state!=OPEN){
+		f->state=ERR;
+		return -1;
+	}
+	f->state=RDWR;
+	switch(mode){
+	case _IOLBF:
+		f->flags|=LINEBUF;
+	case _IOFBF:
+		if(buf==0){
+			buf=malloc(size);
+			if(buf==0){
+				f->state=ERR;
+				return -1;
+			}
+			f->flags|=BALLOC;
+		}
+		f->bufl=size;
+		break;
+	case _IONBF:
+		buf=f->unbuf;
+		f->bufl=0;
+		break;
+	}
+	f->rp=f->wp=f->lp=f->buf=buf;
+	f->state=RDWR;
+	return 0;
+}
+int _IO_setvbuf(FILE *f){
+	static int isatty(int);
+	if(f==stderr || (f==stdout && isatty(1)))
+		return setvbuf(f, (char *)0, _IOLBF, BUFSIZ);
+	else return setvbuf(f, (char *)0, _IOFBF, BUFSIZ);
+}
+static int
+isatty(int fd)
+{
+	char buf[64];
+
+	if(fd2path(fd, buf, sizeof buf) != 0)
+		return 0;
+
+	/* might be /mnt/term/dev/cons */
+	return strlen(buf) >= 9 && strcmp(buf+strlen(buf)-9, "/dev/cons") == 0;
+}
diff --git a/sys/src/libstdio/snprintf.c b/sys/src/libstdio/snprintf.c
new file mode 100755
index 000000000..e73556359
--- /dev/null
+++ b/sys/src/libstdio/snprintf.c
@@ -0,0 +1,17 @@
+/*
+ * pANS stdio -- sprintf
+ */
+#include "iolib.h"
+int snprintf(char *buf, int nbuf, const char *fmt, ...){
+	int n;
+	va_list args;
+	FILE *f=sopenw();
+	if(f==NULL)
+		return 0;
+	setvbuf(f, buf, _IOFBF, nbuf);
+	va_start(args, fmt);
+	n=vfprintf(f, fmt, args);
+	va_end(args);
+	sclose(f);
+	return n;
+}
diff --git a/sys/src/libstdio/sopenr.c b/sys/src/libstdio/sopenr.c
new file mode 100755
index 000000000..bbd377602
--- /dev/null
+++ b/sys/src/libstdio/sopenr.c
@@ -0,0 +1,22 @@
+/*
+ * pANS stdio -- sopenr
+ */
+#include "iolib.h"
+
+FILE *sopenr(const char *s){
+	FILE *f;
+	qlock(&_stdiolk);
+	for(f=_IO_stream;f!=&_IO_stream[FOPEN_MAX];f++) if(f->state==CLOSED) break;
+	if(f==&_IO_stream[FOPEN_MAX]) {
+		qunlock(&_stdiolk);
+		return NULL;
+	}
+	f->buf=f->rp=(char *)s;	/* what an annoyance const is */
+	f->bufl=strlen(s);
+	f->wp=f->buf+f->bufl;
+	f->state=RD;
+	f->flags=STRING;
+	f->fd=-1;
+	qunlock(&_stdiolk);
+	return f;
+}
diff --git a/sys/src/libstdio/sopenw.c b/sys/src/libstdio/sopenw.c
new file mode 100755
index 000000000..cd4836b1d
--- /dev/null
+++ b/sys/src/libstdio/sopenw.c
@@ -0,0 +1,19 @@
+/*
+ * pANS stdio -- sopenw
+ */
+#include "iolib.h"
+FILE *sopenw(void){
+	FILE *f;
+	qlock(&_stdiolk);
+	for(f=_IO_stream;f!=&_IO_stream[FOPEN_MAX];f++) if(f->state==CLOSED) break;
+	if(f==&_IO_stream[FOPEN_MAX]) {
+		qunlock(&_stdiolk);
+		return NULL;
+	}
+	f->buf=f->rp=f->wp=0;
+	f->state=OPEN;
+	f->flags=STRING;
+	f->fd=-1;
+	qunlock(&_stdiolk);
+	return f;
+}
diff --git a/sys/src/libstdio/sprintf.c b/sys/src/libstdio/sprintf.c
new file mode 100755
index 000000000..42aea8c76
--- /dev/null
+++ b/sys/src/libstdio/sprintf.c
@@ -0,0 +1,17 @@
+/*
+ * pANS stdio -- sprintf
+ */
+#include "iolib.h"
+int sprintf(char *buf, const char *fmt, ...){
+	int n;
+	va_list args;
+	FILE *f=sopenw();
+	if(f==NULL)
+		return 0;
+	setvbuf(f, buf, _IOFBF, 100000);
+	va_start(args, fmt);
+	n=vfprintf(f, fmt, args);
+	va_end(args);
+	sclose(f);
+	return n;
+}
diff --git a/sys/src/libstdio/sscanf.c b/sys/src/libstdio/sscanf.c
new file mode 100755
index 000000000..15e5cacc7
--- /dev/null
+++ b/sys/src/libstdio/sscanf.c
@@ -0,0 +1,14 @@
+/*
+ * pANS stdio -- sscanf
+ */
+#include "iolib.h"
+int sscanf(const char *s, const char *fmt, ...){
+	int n;
+	FILE *f=sopenr(s);
+	va_list args;
+	va_start(args, fmt);
+	n=vfscanf(f, fmt, args);
+	va_end(args);
+	sclose(f);
+	return n;
+}
diff --git a/sys/src/libstdio/tmpfile.c b/sys/src/libstdio/tmpfile.c
new file mode 100755
index 000000000..0728c3652
--- /dev/null
+++ b/sys/src/libstdio/tmpfile.c
@@ -0,0 +1,48 @@
+/*
+ * pANS stdio -- tmpfile
+ *
+ * Bug: contains a critical section.  Two executions by the same
+ * user could interleave as follows, both yielding the same file:
+ *	access fails
+ *			access fails
+ *	fopen succeeds
+ *			fopen succeeds
+ *	unlink succeeds
+ *			unlink fails
+ * As I read the pANS, this can't reasonably use tmpnam to generate
+ * the name, so that code is duplicated.
+ */
+#include "iolib.h"
+
+static char tmpsmade[FOPEN_MAX][L_tmpnam+1];
+static int ntmps = 0;
+
+static void rmtmps(void);
+
+FILE *tmpfile(void){
+	FILE *f;
+	static char name[]="/tmp/tf0000000000000";
+	char *p;
+	while(access(name, 0)==0){
+		p=name+7;
+		while(*p=='9') *p++='0';
+		if(*p=='\0') return NULL;
+		++*p;
+	}
+	f=fopen(name, "wb+");
+	if(f && ntmps<FOPEN_MAX){
+		if(ntmps==0)
+			atexit(rmtmps);
+		strcpy(tmpsmade[ntmps++], name);
+	}
+	return f;
+}
+
+static void
+rmtmps(void)
+{
+	int i;
+	
+	for(i=0; i<ntmps; i++)
+		remove(tmpsmade[i]);
+}
diff --git a/sys/src/libstdio/tmpnam.c b/sys/src/libstdio/tmpnam.c
new file mode 100755
index 000000000..666e4dad9
--- /dev/null
+++ b/sys/src/libstdio/tmpnam.c
@@ -0,0 +1,20 @@
+/*
+ * pANS stdio -- tmpnam
+ */
+#include "iolib.h"
+
+char *tmpnam(char *s){
+	static char name[]="/tmp/tn000000000000";
+	char *p;
+	do{
+		p=name+7;
+		while(*p=='9') *p++='0';
+		if(*p=='\0') return NULL;
+		++*p;
+	}while(access(name, 0)==0);
+	if(s){
+		strcpy(s, name);
+		return s;
+	}
+	return name;
+}
diff --git a/sys/src/libstdio/ungetc.c b/sys/src/libstdio/ungetc.c
new file mode 100755
index 000000000..4c12c5869
--- /dev/null
+++ b/sys/src/libstdio/ungetc.c
@@ -0,0 +1,28 @@
+/*
+ * pANS stdio -- ungetc
+ */
+#include "iolib.h"
+int ungetc(int c, FILE *f){
+	if(c==EOF) return EOF;
+	switch(f->state){
+	default:	/* WR */
+		f->state=ERR;
+		return EOF;
+	case CLOSED:
+	case ERR:
+		return EOF;
+	case OPEN:
+		_IO_setvbuf(f);
+	case RDWR:
+	case END:
+		f->rp=f->wp=f->buf+(f->bufl==0?1:f->bufl);
+		f->state=RD;
+	case RD:
+		if(f->rp==f->buf) return EOF;
+		if(f->flags&STRING)
+			f->rp--;
+		else
+			*--f->rp=c;
+		return (char)c;
+	}
+}
diff --git a/sys/src/libstdio/vfprintf.c b/sys/src/libstdio/vfprintf.c
new file mode 100755
index 000000000..4600caff6
--- /dev/null
+++ b/sys/src/libstdio/vfprintf.c
@@ -0,0 +1,558 @@
+/*
+ * pANS stdio -- vfprintf
+ */
+#include "iolib.h"
+/*
+ * Leading flags
+ */
+#define	SPACE	1		/* ' ' prepend space if no sign printed */
+#define	ALT	2		/* '#' use alternate conversion */
+#define	SIGN	4		/* '+' prepend sign, even if positive */
+#define	LEFT	8		/* '-' left-justify */
+#define	ZPAD	16		/* '0' zero-pad */
+/*
+ * Trailing flags
+ */
+#define	SHORT	32		/* 'h' convert a short integer */
+#define	LONG	64		/* 'l' convert a long integer */
+#define	LDBL	128		/* 'L' convert a long double */
+#define	PTR	256		/*     convert a void * (%p) */
+
+static int lflag[] = {	/* leading flags */
+0,	0,	0,	0,	0,	0,	0,	0,	/* ^@ ^A ^B ^C ^D ^E ^F ^G */
+0,	0,	0,	0,	0,	0,	0,	0,	/* ^H ^I ^J ^K ^L ^M ^N ^O */
+0,	0,	0,	0,	0,	0,	0,	0,	/* ^P ^Q ^R ^S ^T ^U ^V ^W */
+0,	0,	0,	0,	0,	0,	0,	0,	/* ^X ^Y ^Z ^[ ^\ ^] ^^ ^_ */
+SPACE,	0,	0,	ALT,	0,	0,	0,	0,	/* sp  !  "  #  $  %  &  ' */
+0,	0,	0,	SIGN,	0,	LEFT,	0,	0,	/*  (  )  *  +  ,  -  .  / */
+ZPAD,	0,	0,	0,	0,	0,	0,	0,	/*  0  1  2  3  4  5  6  7 */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  8  9  :  ;  <  =  >  ? */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  @  A  B  C  D  E  F  G */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  H  I  J  K  L  M  N  O */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  P  Q  R  S  T  U  V  W */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  X  Y  Z  [  \  ]  ^  _ */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  `  a  b  c  d  e  f  g */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  h  i  j  k  l  m  n  o */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  p  q  r  s  t  u  v  w */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  x  y  z  {  |  }  ~ ^? */
+
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+};
+
+static int tflag[] = {	/* trailing flags */
+0,	0,	0,	0,	0,	0,	0,	0,	/* ^@ ^A ^B ^C ^D ^E ^F ^G */
+0,	0,	0,	0,	0,	0,	0,	0,	/* ^H ^I ^J ^K ^L ^M ^N ^O */
+0,	0,	0,	0,	0,	0,	0,	0,	/* ^P ^Q ^R ^S ^T ^U ^V ^W */
+0,	0,	0,	0,	0,	0,	0,	0,	/* ^X ^Y ^Z ^[ ^\ ^] ^^ ^_ */
+0,	0,	0,	0,	0,	0,	0,	0,	/* sp  !  "  #  $  %  &  ' */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  (  )  *  +  ,  -  .  / */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  0  1  2  3  4  5  6  7 */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  8  9  :  ;  <  =  >  ? */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  @  A  B  C  D  E  F  G */
+0,	0,	0,	0,	LDBL,	0,	0,	0,	/*  H  I  J  K  L  M  N  O */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  P  Q  R  S  T  U  V  W */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  X  Y  Z  [  \  ]  ^  _ */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  `  a  b  c  d  e  f  g */
+SHORT,	0,	0,	0,	LONG,	0,	0,	0,	/*  h  i  j  k  l  m  n  o */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  p  q  r  s  t  u  v  w */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  x  y  z  {  |  }  ~ ^? */
+
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+};
+
+static int ocvt_E(FILE *, va_list *, int, int, int);
+static int ocvt_G(FILE *, va_list *, int, int, int);
+static int ocvt_X(FILE *, va_list *, int, int, int);
+static int ocvt_c(FILE *, va_list *, int, int, int);
+static int ocvt_d(FILE *, va_list *, int, int, int);
+static int ocvt_e(FILE *, va_list *, int, int, int);
+static int ocvt_f(FILE *, va_list *, int, int, int);
+static int ocvt_g(FILE *, va_list *, int, int, int);
+static int ocvt_n(FILE *, va_list *, int, int, int);
+static int ocvt_o(FILE *, va_list *, int, int, int);
+static int ocvt_p(FILE *, va_list *, int, int, int);
+static int ocvt_s(FILE *, va_list *, int, int, int);
+static int ocvt_u(FILE *, va_list *, int, int, int);
+static int ocvt_x(FILE *, va_list *, int, int, int);
+
+static int(*ocvt[])(FILE *, va_list *, int, int, int) = {
+0,	0,	0,	0,	0,	0,	0,	0,	/* ^@ ^A ^B ^C ^D ^E ^F ^G */
+0,	0,	0,	0,	0,	0,	0,	0,	/* ^H ^I ^J ^K ^L ^M ^N ^O */
+0,	0,	0,	0,	0,	0,	0,	0,	/* ^P ^Q ^R ^S ^T ^U ^V ^W */
+0,	0,	0,	0,	0,	0,	0,	0,	/* ^X ^Y ^Z ^[ ^\ ^] ^^ ^_ */
+0,	0,	0,	0,	0,	0,	0,	0,	/* sp  !  "  #  $  %  &  ' */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  (  )  *  +  ,  -  .  / */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  0  1  2  3  4  5  6  7 */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  8  9  :  ;  <  =  >  ? */
+0,	0,	0,	0,	0,	ocvt_E,	0,	ocvt_G,	/*  @  A  B  C  D  E  F  G */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  H  I  J  K  L  M  N  O */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  P  Q  R  S  T  U  V  W */
+ocvt_X,	0,	0,	0,	0,	0,	0,	0,	/*  X  Y  Z  [  \  ]  ^  _ */
+0,	0,	0,	ocvt_c,	ocvt_d,	ocvt_e,	ocvt_f,	ocvt_g,	/*  `  a  b  c  d  e  f  g */
+0,	ocvt_d,	0,	0,	0,	0,	ocvt_n,	ocvt_o,	/*  h  i  j  k  l  m  n  o */
+ocvt_p,	0,	0,	ocvt_s,	0,	ocvt_u,	0,	0,	/*  p  q  r  s  t  u  v  w */
+ocvt_x,	0,	0,	0,	0,	0,	0,	0,	/*  x  y  z  {  |  }  ~ ^? */
+
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+};
+
+static int nprint;
+
+QLock _stdiolk;
+
+int
+vfprintf(FILE *f, const char *s, va_list args)
+{
+	int flags, width, precision;
+
+	qlock(&_stdiolk);
+
+	nprint = 0;
+	while(*s){
+		if(*s != '%'){
+			putc(*s++, f);
+			nprint++;
+			continue;
+		}
+		s++;
+		flags = 0;
+		while(lflag[*s&_IO_CHMASK]) flags |= lflag[*s++&_IO_CHMASK];
+		if(*s == '*'){
+			width = va_arg(args, int);
+			s++;
+			if(width<0){
+				flags |= LEFT;
+				width = -width;
+			}
+		}
+		else{
+			width = 0;
+			while('0'<=*s && *s<='9') width = width*10 + *s++ - '0';
+		}
+		if(*s == '.'){
+			s++;
+			if(*s == '*'){
+				precision = va_arg(args, int);
+				s++;
+			}
+			else{
+				precision = 0;
+				while('0'<=*s && *s<='9') precision = precision*10 + *s++ - '0';
+			}
+		}
+		else
+			precision = -1;
+		while(tflag[*s&_IO_CHMASK]) flags |= tflag[*s++&_IO_CHMASK];
+		if(ocvt[*s]) nprint += (*ocvt[*s++])(f, &args, flags, width, precision);
+		else if(*s){
+			putc(*s++, f);
+			nprint++;
+		}
+	}
+
+	qunlock(&_stdiolk);
+
+	if(ferror(f)){
+		if((f->flags&STRING) && f->wp==f->rp && f->wp>f->buf){
+			*(f->wp-1) = '\0';
+			return nprint;
+		}
+		return -1;
+	}
+	return nprint;
+}
+
+static int
+ocvt_c(FILE *f, va_list *args, int flags, int width, int precision)
+{
+#pragma ref precision
+	int i;
+
+	if(!(flags&LEFT)) for(i=1; i<width; i++) putc(' ', f);
+	putc((unsigned char)va_arg(*args, int), f);
+	if(flags&LEFT) for(i=1; i<width; i++) putc(' ', f);
+	return width<1 ? 1 : width;
+}
+
+static int
+ocvt_s(FILE *f, va_list *args, int flags, int width, int precision)
+{
+	int i, n = 0;
+	char *s;
+
+	s = va_arg(*args, char *);
+	if(!(flags&LEFT)){
+		if(precision >= 0)
+			for(i=0; i!=precision && s[i]; i++);
+		else
+			for(i=0; s[i]; i++);
+		for(; i<width; i++){
+			putc(' ', f);
+			n++;
+		}
+	}
+	if(precision >= 0){
+		for(i=0; i!=precision && *s; i++){
+			putc(*s++, f);
+			n++;
+		}
+	} else{
+		for(i=0;*s;i++){
+			putc(*s++, f);
+			n++;
+		}
+	}
+	if(flags&LEFT){
+		for(; i<width; i++){
+			putc(' ', f);
+			n++;
+		}
+	}
+	return n;
+}
+
+static int
+ocvt_n(FILE *f, va_list *args, int flags, int width, int precision)
+{
+#pragma ref f
+#pragma ref width
+#pragma ref precision
+	if(flags&SHORT)
+		*va_arg(*args, short *) = nprint;
+	else if(flags&LONG)
+		*va_arg(*args, long *) = nprint;
+	else
+		*va_arg(*args, int *) = nprint;
+	return 0;
+}
+
+/*
+ * Generic fixed-point conversion
+ *	f is the output FILE *;
+ *	args is the va_list * from which to get the number;
+ *	flags, width and precision are the results of printf-cracking;
+ *	radix is the number base to print in;
+ *	alphabet is the set of digits to use;
+ *	prefix is the prefix to print before non-zero numbers when
+ *	using ``alternate form.''
+ */
+static int
+ocvt_fixed(FILE *f, va_list *args, int flags, int width, int precision,
+	int radix, int sgned, char alphabet[], char *prefix)
+{
+	char digits[128];	/* no reasonable machine will ever overflow this */
+	char *sign;
+	char *dp;
+	long snum;
+	unsigned long num;
+	int nout, npad, nlzero;
+
+	if(sgned){
+		if(flags&PTR) snum = (long)va_arg(*args, void *);
+		else if(flags&SHORT) snum = va_arg(*args, short);
+		else if(flags&LONG) snum = va_arg(*args, long);
+		else snum = va_arg(*args, int);
+		if(snum < 0){
+			sign = "-";
+			num = -snum;
+		} else{
+			if(flags&SIGN) sign = "+";
+			else if(flags&SPACE) sign = " ";
+			else sign = "";
+			num = snum;
+		}
+	} else {
+		sign = "";
+		if(flags&PTR) num = (long)va_arg(*args, void *);
+		else if(flags&SHORT) num = va_arg(*args, unsigned short);
+		else if(flags&LONG) num = va_arg(*args, unsigned long);
+		else num = va_arg(*args, unsigned int);
+	}
+	if(num == 0) prefix = "";
+	dp = digits;
+	do{
+		*dp++ = alphabet[num%radix];
+		num /= radix;
+	}while(num);
+	if(precision==0 && dp-digits==1 && dp[-1]=='0')
+		dp--;
+	nlzero = precision-(dp-digits);
+	if(nlzero < 0) nlzero = 0;
+	if(flags&ALT){
+		if(radix == 8) if(dp[-1]=='0' || nlzero) prefix = "";
+	}
+	else prefix = "";
+	nout = dp-digits+nlzero+strlen(prefix)+strlen(sign);
+	npad = width-nout;
+	if(npad < 0) npad = 0;
+	nout += npad;
+	if(!(flags&LEFT)){
+		if(flags&ZPAD && precision <= 0){
+			fputs(sign, f);
+			fputs(prefix, f);
+			while(npad){
+				putc('0', f);
+				--npad;
+			}
+		} else{
+			while(npad){
+				putc(' ', f);
+				--npad;
+			}
+			fputs(sign, f);
+			fputs(prefix, f);
+		}
+		while(nlzero){
+			putc('0', f);
+			--nlzero;
+		}
+		while(dp!=digits) putc(*--dp, f);
+	}
+	else{
+		fputs(sign, f);
+		fputs(prefix, f);
+		while(nlzero){
+			putc('0', f);
+			--nlzero;
+		}
+		while(dp != digits) putc(*--dp, f);
+		while(npad){
+			putc(' ', f);
+			--npad;
+		}
+	}
+	return nout;	
+}
+
+static int
+ocvt_X(FILE *f, va_list *args, int flags, int width, int precision)
+{
+	return ocvt_fixed(f, args, flags, width, precision, 16, 0, "0123456789ABCDEF", "0X");
+}
+
+static int
+ocvt_d(FILE *f, va_list *args, int flags, int width, int precision)
+{
+	return ocvt_fixed(f, args, flags, width, precision, 10, 1, "0123456789", "");
+}
+
+static int
+ocvt_o(FILE *f, va_list *args, int flags, int width, int precision)
+{
+	return ocvt_fixed(f, args, flags, width, precision, 8, 0, "01234567", "0");
+}
+
+static int
+ocvt_p(FILE *f, va_list *args, int flags, int width, int precision)
+{
+	return ocvt_fixed(f, args, flags|PTR|ALT, width, precision, 16, 0,
+		"0123456789ABCDEF", "0X");
+}
+
+static int
+ocvt_u(FILE *f, va_list *args, int flags, int width, int precision)
+{
+	return ocvt_fixed(f, args, flags, width, precision, 10, 0, "0123456789", "");
+}
+
+static int
+ocvt_x(FILE *f, va_list *args, int flags, int width, int precision)
+{
+	return ocvt_fixed(f, args, flags, width, precision, 16, 0, "0123456789abcdef", "0x");
+}
+
+static int ocvt_flt(FILE *, va_list *, int, int, int, char);
+
+static int
+ocvt_E(FILE *f, va_list *args, int flags, int width, int precision)
+{
+	return ocvt_flt(f, args, flags, width, precision, 'E');
+}
+
+static int
+ocvt_G(FILE *f, va_list *args, int flags, int width, int precision)
+{
+	return ocvt_flt(f, args, flags, width, precision, 'G');
+}
+
+static int
+ocvt_e(FILE *f, va_list *args, int flags, int width, int precision)
+{
+	return ocvt_flt(f, args, flags, width, precision, 'e');
+}
+
+static int
+ocvt_f(FILE *f, va_list *args, int flags, int width, int precision)
+{
+	return ocvt_flt(f, args, flags, width, precision, 'f');
+}
+
+static int
+ocvt_g(FILE *f, va_list *args, int flags, int width, int precision)
+{
+	return ocvt_flt(f, args, flags, width, precision, 'g');
+}
+
+static int
+ocvt_flt(FILE *f, va_list *args, int flags, int width, int precision, char afmt)
+{
+	int echr;
+	char *digits, *edigits;
+	int exponent;
+	char fmt;
+	int sign;
+	int ndig;
+	int nout, i;
+	char ebuf[20];	/* no sensible machine will overflow this */
+	char *eptr;
+	double d;
+
+	echr = 'e';
+	fmt = afmt;
+	d = va_arg(*args, double);
+	if(precision < 0) precision = 6;
+	switch(fmt){
+	case 'f':
+		digits = dtoa(d, 3, precision, &exponent, &sign, &edigits);
+		break;
+	case 'E':
+		echr = 'E';
+		fmt = 'e';
+		/* fall through */
+	case 'e':
+		digits = dtoa(d, 2, 1+precision, &exponent, &sign, &edigits);
+		break;
+	case 'G':
+		echr = 'E';
+		/* fall through */
+	case 'g':
+		if (precision > 0)
+			digits = dtoa(d, 2, precision, &exponent, &sign, &edigits);
+		else {
+			digits = dtoa(d, 0, precision, &exponent, &sign, &edigits);
+			precision = edigits - digits;
+			if (exponent > precision && exponent <= precision + 4)
+				precision = exponent;
+			}
+		if(exponent >= -3 && exponent <= precision){
+			fmt = 'f';
+			precision -= exponent;
+		}else{
+			fmt = 'e';
+			--precision;
+		}
+		break;
+	}
+	if (exponent == 9999) {
+		/* Infinity or Nan */
+		precision = 0;
+		exponent = edigits - digits;
+		fmt = 'f';
+	}
+	ndig = edigits-digits;
+	if((afmt=='g' || afmt=='G') && !(flags&ALT)){	/* knock off trailing zeros */
+		if(fmt == 'f'){
+			if(precision+exponent > ndig) {
+				precision = ndig - exponent;
+				if(precision < 0)
+					precision = 0;
+			}
+		}
+		else{
+			if(precision > ndig-1) precision = ndig-1;
+		}
+	}
+	nout = precision;				/* digits after decimal point */
+	if(precision!=0 || flags&ALT) nout++;		/* decimal point */
+	if(fmt=='f' && exponent>0) nout += exponent;	/* digits before decimal point */
+	else nout++;					/* there's always at least one */
+	if(sign || flags&(SPACE|SIGN)) nout++;		/* sign */
+	if(fmt != 'f'){					/* exponent */
+		eptr = ebuf;
+		for(i=exponent<=0?1-exponent:exponent-1; i; i/=10)
+			*eptr++ = '0' + i%10;
+		while(eptr<ebuf+2) *eptr++ = '0';
+		nout += eptr-ebuf+2;			/* e+99 */
+	}
+	if(!(flags&ZPAD) && !(flags&LEFT))
+		while(nout < width){
+			putc(' ', f);
+			nout++;
+		}
+	if(sign) putc('-', f);
+	else if(flags&SIGN) putc('+', f);
+	else if(flags&SPACE) putc(' ', f);
+	if(flags&ZPAD)
+		while(nout < width){
+			putc('0', f);
+			nout++;
+		}
+	if(fmt == 'f'){
+		for(i=0; i<exponent; i++) putc(i<ndig?digits[i]:'0', f);
+		if(i == 0) putc('0', f);
+		if(precision>0 || flags&ALT) putc('.', f);
+		for(i=0; i!=precision; i++)
+			putc(0<=i+exponent && i+exponent<ndig?digits[i+exponent]:'0', f);
+	}
+	else{
+		putc(digits[0], f);
+		if(precision>0 || flags&ALT) putc('.', f);
+		for(i=0; i!=precision; i++) putc(i<ndig-1?digits[i+1]:'0', f);
+	}
+	if(fmt != 'f'){
+		putc(echr, f);
+		putc(exponent<=0?'-':'+', f);
+		while(eptr>ebuf) putc(*--eptr, f);
+	}
+	while(nout < width){
+		putc(' ', f);
+		nout++;
+	}
+	freedtoa(digits);
+	return nout;
+}
diff --git a/sys/src/libstdio/vfscanf.c b/sys/src/libstdio/vfscanf.c
new file mode 100755
index 000000000..d17dcf2c4
--- /dev/null
+++ b/sys/src/libstdio/vfscanf.c
@@ -0,0 +1,364 @@
+/*
+ * pANS stdio -- vfscanf
+ */
+#include "iolib.h"
+#include <ctype.h>
+static int icvt_f(FILE *f, va_list *args, int store, int width, int type);
+static int icvt_x(FILE *f, va_list *args, int store, int width, int type);
+static int icvt_sq(FILE *f, va_list *args, int store, int width, int type);
+static int icvt_c(FILE *f, va_list *args, int store, int width, int type);
+static int icvt_d(FILE *f, va_list *args, int store, int width, int type);
+static int icvt_i(FILE *f, va_list *args, int store, int width, int type);
+static int icvt_n(FILE *f, va_list *args, int store, int width, int type);
+static int icvt_o(FILE *f, va_list *args, int store, int width, int type);
+static int icvt_p(FILE *f, va_list *args, int store, int width, int type);
+static int icvt_s(FILE *f, va_list *args, int store, int width, int type);
+static int icvt_u(FILE *f, va_list *args, int store, int width, int type);
+static int (*icvt[])(FILE *, va_list *, int, int, int)={
+0,	0,	0,	0,	0,	0,	0,	0,	/* ^@ ^A ^B ^C ^D ^E ^F ^G */
+0,	0,	0,	0,	0,	0,	0,	0,	/* ^H ^I ^J ^K ^L ^M ^N ^O */
+0,	0,	0,	0,	0,	0,	0,	0,	/* ^P ^Q ^R ^S ^T ^U ^V ^W */
+0,	0,	0,	0,	0,	0,	0,	0,	/* ^X ^Y ^Z ^[ ^\ ^] ^^ ^_ */
+0,	0,	0,	0,	0,	0,	0,	0,	/* sp  !  "  #  $  %  &  ' */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  (  )  *  +  ,  -  .  / */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  0  1  2  3  4  5  6  7 */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  8  9  :  ;  <  =  >  ? */
+0,	0,	0,	0,	0,	icvt_f,	0,	icvt_f,	/*  @  A  B  C  D  E  F  G */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  H  I  J  K  L  M  N  O */
+0,	0,	0,	0,	0,	0,	0,	0,	/*  P  Q  R  S  T  U  V  W */
+icvt_x,	0,	0,	icvt_sq,0,	0,	0,	0,	/*  X  Y  Z  [  \  ]  ^  _ */
+0,	0,	0,	icvt_c,	icvt_d,	icvt_f,	icvt_f,	icvt_f,	/*  `  a  b  c  d  e  f  g */
+0,	icvt_i,	0,	0,	0,	0,	icvt_n,	icvt_o,	/*  h  i  j  k  l  m  n  o */
+icvt_p,	0,	0,	icvt_s,	0,	icvt_u,	0,	0,	/*  p  q  r  s  t  u  v  w */
+icvt_x,	0,	0,	0,	0,	0,	0,	0,	/*  x  y  z  {  |  }  ~ ^? */
+
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+0,	0,	0,	0,	0,	0,	0,	0,
+
+};
+#define	ngetc(f)		(nread++, getc(f))
+#define	nungetc(c, f)		(--nread, ungetc((c), f))
+#define	wgetc(c, f, out)	if(width--==0) goto out; (c)=ngetc(f)
+#define	wungetc(c, f)		(++width, nungetc(c, f))
+static int nread, ncvt;
+static const char *fmtp;
+
+int vfscanf(FILE *f, const char *s, va_list args){
+	int c, width, type, store;
+	nread=0;
+	ncvt=0;
+	fmtp=s;
+	for(;*fmtp;fmtp++) switch(*fmtp){
+	default:
+		if(isspace(*fmtp)){
+			do
+				c=ngetc(f);
+			while(isspace(c));
+			if(c==EOF) return ncvt?ncvt:EOF;
+			nungetc(c, f);
+			break;
+		}
+	NonSpecial:
+		c=ngetc(f);
+		if(c==EOF) return ncvt?ncvt:EOF;
+		if(c!=*fmtp){
+			nungetc(c, f);
+			return ncvt;
+		}
+		break;
+	case '%':
+		fmtp++;
+		if(*fmtp!='*') store=1;
+		else{
+			store=0;
+			fmtp++;
+		}
+		if('0'<=*fmtp && *fmtp<='9'){
+			width=0;
+			while('0'<=*fmtp && *fmtp<='9') width=width*10 + *fmtp++ - '0';
+		}
+		else
+			width=-1;
+		type=*fmtp=='h' || *fmtp=='l' || *fmtp=='L'?*fmtp++:'n';
+		if(!icvt[*fmtp]) goto NonSpecial;
+		if(!(*icvt[*fmtp])(f, &args, store, width, type))
+			return ncvt?ncvt:EOF;
+		if(*fmtp=='\0') break;
+		if(store) ncvt++;
+	}
+	return ncvt;	
+}
+static int icvt_n(FILE *f, va_list *args, int store, int width, int type){
+#pragma ref f
+#pragma ref width
+	if(store){
+		--ncvt;	/* this assignment doesn't count! */
+		switch(type){
+		case 'h': *va_arg(*args, short *)=nread; break;
+		case 'n': *va_arg(*args, int *)=nread; break;
+		case 'l':
+		case 'L': *va_arg(*args, long *)=nread; break;
+		}
+	}
+	return 1;
+}
+#define	SIGNED		1
+#define	UNSIGNED	2
+#define	POINTER		3
+/*
+ * Generic fixed-point conversion
+ *	f is the input FILE *;
+ *	args is the va_list * into which to store the number;
+ *	store is a flag to enable storing;
+ *	width is the maximum field width;
+ *	type is 'h' 'l' or 'L', the scanf type modifier;
+ *	unsgned is SIGNED, UNSIGNED or POINTER, giving part of the type to store in;
+ *	base is the number base -- if 0, C number syntax is used.
+ */
+static int icvt_fixed(FILE *f, va_list *args,
+				int store, int width, int type, int unsgned, int base){
+	unsigned long int num=0;
+	int sign=1, ndig=0, dig;
+	int c;
+	do
+		c=ngetc(f);
+	while(isspace(c));
+	if(width--==0){
+		nungetc(c, f);
+		goto Done;
+	}
+	if(c=='+'){
+		wgetc(c, f, Done);
+	}
+	else if(c=='-'){
+		sign=-1;
+		wgetc(c, f, Done);
+	}
+	switch(base){
+	case 0:
+		if(c=='0'){
+			wgetc(c, f, Done);
+			if(c=='x' || c=='X'){
+				wgetc(c, f, Done);
+				base=16;
+			}
+			else{
+				ndig=1;
+				base=8;
+			}
+		}
+		else
+			base=10;
+		break;
+	case 16:
+		if(c=='0'){
+			wgetc(c, f, Done);
+			if(c=='x' || c=='X'){
+				wgetc(c, f, Done);
+			}
+			else ndig=1;
+		}
+		break;
+	}
+	while('0'<=c && c<='9' || 'a'<=c && c<='f' || 'A'<=c && c<='F'){
+		dig='0'<=c && c<='9'?c-'0':'a'<=c && c<='f'?c-'a'+10:c-'A'+10;
+		if(dig>=base) break;
+		ndig++;
+		num=num*base+dig;
+		wgetc(c, f, Done);
+	}
+	nungetc(c, f);
+Done:
+	if(ndig==0) return 0;
+	if(store){
+		switch(unsgned){
+		case SIGNED:
+			switch(type){
+			case 'h': *va_arg(*args,  short *)=num*sign; break;
+			case 'n': *va_arg(*args,  int *)=num*sign; break;
+			case 'l':
+			case 'L': *va_arg(*args,  long *)=num*sign; break;
+			}
+			break;
+		case UNSIGNED:
+			switch(type){
+			case 'h': *va_arg(*args, unsigned short *)=num*sign; break;
+			case 'n': *va_arg(*args, unsigned int *)=num*sign; break;
+			case 'l':
+			case 'L': *va_arg(*args, unsigned long *)=num*sign; break;
+			}
+			break;
+		case POINTER:
+			*va_arg(*args, void **)=(void *)(num*sign); break;
+		}
+	}
+	return 1;
+}
+static int icvt_d(FILE *f, va_list *args, int store, int width, int type){
+	return icvt_fixed(f, args, store, width, type, SIGNED, 10);
+}
+static int icvt_x(FILE *f, va_list *args, int store, int width, int type){
+	return icvt_fixed(f, args, store, width, type, UNSIGNED, 16);
+}
+static int icvt_o(FILE *f, va_list *args, int store, int width, int type){
+	return icvt_fixed(f, args, store, width, type, UNSIGNED, 8);
+}
+static int icvt_i(FILE *f, va_list *args, int store, int width, int type){
+	return icvt_fixed(f, args, store, width, type, SIGNED, 0);
+}
+static int icvt_u(FILE *f, va_list *args, int store, int width, int type){
+	return icvt_fixed(f, args, store, width, type, UNSIGNED, 10);
+}
+static int icvt_p(FILE *f, va_list *args, int store, int width, int type){
+	return icvt_fixed(f, args, store, width, type, POINTER, 16);
+}
+#define	NBUF	509
+static int icvt_f(FILE *f, va_list *args, int store, int width, int type){
+	char buf[NBUF+1];
+	char *s=buf;
+	int c, ndig=0, ndpt=0, nexp=1;
+	if(width<0 || NBUF<width) width=NBUF;	/* bug -- no limit specified in ansi */
+	do
+		c=ngetc(f);
+	while(isspace(c));
+	if(width--==0){
+		nungetc(c, f);
+		goto Done;
+	}
+	if(c=='+' || c=='-'){
+		*s++=c;
+		wgetc(c, f, Done);
+	}
+	while('0'<=c && c<='9' || ndpt==0 && c=='.'){
+		if(c=='.') ndpt++;
+		else ndig++;
+		*s++=c;
+		wgetc(c, f, Done);
+	}
+	if(c=='e' || c=='E'){
+		*s++=c;
+		nexp=0;
+		wgetc(c, f, Done);
+		if(c=='+' || c=='-'){
+			*s++=c;
+			wgetc(c, f, Done);
+		}
+		while('0'<=c && c<='9'){
+			*s++=c;
+			nexp++;
+			wgetc(c, f, Done);
+		}
+	}
+	nungetc(c, f);
+Done:
+	if(ndig==0 || nexp==0) return 0;
+	*s='\0';
+	if(store) switch(type){
+	case 'h':
+	case 'n': *va_arg(*args, float *)=atof(buf); break;
+	case 'L': /* bug -- should store in a long double */
+	case 'l': *va_arg(*args, double *)=atof(buf); break;
+	}
+	return 1;
+}
+static int icvt_s(FILE *f, va_list *args, int store, int width, int type){
+#pragma ref type
+	int c, nn;
+	register char *s;
+	if(store) s=va_arg(*args, char *);
+	do
+		c=ngetc(f);
+	while(isspace(c));
+	if(width--==0){
+		nungetc(c, f);
+		goto Done;
+	}
+	nn=0;
+	while(!isspace(c)){
+		if(c==EOF){
+			nread--;
+			if(nn==0) return 0;
+			else goto Done;
+		}
+		nn++;
+		if(store) *s++=c;
+		wgetc(c, f, Done);
+	}
+	nungetc(c, f);
+Done:
+	if(store) *s='\0';
+	return 1;
+}
+static int icvt_c(FILE *f, va_list *args, int store, int width, int type){
+#pragma ref type
+	int c;
+	register char *s;
+	if(store) s=va_arg(*args, char *);
+	if(width<0) width=1;
+	for(;;){
+		wgetc(c, f, Done);
+		if(c==EOF) return 0;
+		if(store) *s++=c;
+	}
+Done:
+	return 1;
+}
+static int match(int c, const char *pat){
+	int ok=1;
+	if(*pat=='^'){
+		ok=!ok;
+		pat++;
+	}
+	while(pat!=fmtp){
+		if(pat+2<fmtp && pat[1]=='-'){
+			if(pat[0]<=c && c<=pat[2]
+			|| pat[2]<=c && c<=pat[0])
+				return ok;
+			pat+=2;
+		}
+		else if(c==*pat) return ok;
+		pat++;
+	}
+	return !ok;
+}
+static int icvt_sq(FILE *f, va_list *args, int store, int width, int type){
+#pragma ref type
+	int c, nn;
+	register char *s;
+	register const char *pat;
+	pat=++fmtp;
+	if(*fmtp=='^') fmtp++;
+	if(*fmtp!='\0') fmtp++;
+	while(*fmtp!='\0' && *fmtp!=']') fmtp++;
+	if(store) s=va_arg(*args, char *);
+	nn=0;
+	for(;;){
+		wgetc(c, f, Done);
+		if(c==EOF){
+			nread--;
+			if(nn==0) return 0;
+			else goto Done;
+		}
+		if(!match(c, pat)) break;
+		if(store) *s++=c;
+		nn++;
+	}
+	nungetc(c, f);
+Done:
+	if(store) *s='\0';
+	return 1;
+}
diff --git a/sys/src/libstdio/vprintf.c b/sys/src/libstdio/vprintf.c
new file mode 100755
index 000000000..6576219eb
--- /dev/null
+++ b/sys/src/libstdio/vprintf.c
@@ -0,0 +1,7 @@
+/*
+ * pANS stdio -- vprintf
+ */
+#include "iolib.h"
+int vprintf(const char *fmt, va_list args){
+	return vfprintf(stdout, fmt, args);
+}
diff --git a/sys/src/libstdio/vsnprintf.c b/sys/src/libstdio/vsnprintf.c
new file mode 100755
index 000000000..16af2af98
--- /dev/null
+++ b/sys/src/libstdio/vsnprintf.c
@@ -0,0 +1,14 @@
+/*
+ * pANS stdio -- vsnprintf
+ */
+#include "iolib.h"
+int vsnprintf(char *buf, int nbuf, const char *fmt, va_list args){
+	int n;
+	FILE *f=sopenw();
+	if(f==NULL)
+		return 0;
+	setvbuf(f, buf, _IOFBF, nbuf);
+	n=vfprintf(f, fmt, args);
+	sclose(f);
+	return n;
+}
diff --git a/sys/src/libstdio/vsprintf.c b/sys/src/libstdio/vsprintf.c
new file mode 100755
index 000000000..63fb3e736
--- /dev/null
+++ b/sys/src/libstdio/vsprintf.c
@@ -0,0 +1,14 @@
+/*
+ * pANS stdio -- vsprintf
+ */
+#include "iolib.h"
+int vsprintf(char *buf, const char *fmt, va_list args){
+	int n;
+	FILE *f=sopenw();
+	if(f==NULL)
+		return 0;
+	setvbuf(f, buf, _IOFBF, 100000);
+	n=vfprintf(f, fmt, args);
+	sclose(f);
+	return n;
+}