ref: 065c3557af8de1b20d94c2e86a4a29c5d33ccc67
dir: /sys/src/ape/lib/ap/stdio/setvbuf.c/
/* * 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); }