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/*
* pANS stdio -- setvbuf
*/
#include "iolib.h"
#include <stdlib.h>
int setvbuf(FILE *f, char *buf, int mode, size_t 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){
if(f==stderr || (f==stdout && isatty(1)))
return setvbuf(f, (char *)0, _IOLBF, BUFSIZ);
return setvbuf(f, (char *)0, _IOFBF, BUFSIZ);
}
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