Import sources from 2011-03-30 iso image

1 files changed, 41 insertions, 0 deletions

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);
+}