50 lines
868 B
C
50 lines
868 B
C
/*
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* pANS stdio -- setvbuf
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*/
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#include "iolib.h"
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int setvbuf(FILE *f, char *buf, int mode, long size){
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if(f->state!=OPEN){
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f->state=ERR;
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return -1;
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}
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f->state=RDWR;
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switch(mode){
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case _IOLBF:
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f->flags|=LINEBUF;
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case _IOFBF:
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if(buf==0){
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buf=malloc(size);
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if(buf==0){
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f->state=ERR;
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return -1;
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}
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f->flags|=BALLOC;
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}
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f->bufl=size;
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break;
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case _IONBF:
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buf=f->unbuf;
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f->bufl=0;
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break;
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}
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f->rp=f->wp=f->lp=f->buf=buf;
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f->state=RDWR;
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return 0;
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}
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static int
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isatty(int fd)
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{
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char buf[64];
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if(fd2path(fd, buf, sizeof buf) != 0)
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return 0;
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/* might be /mnt/term/dev/cons */
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return strlen(buf) >= 9 && strcmp(buf+strlen(buf)-9, "/dev/cons") == 0;
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}
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int _IO_setvbuf(FILE *f){
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if(f==stderr || (f==stdout && isatty(1)))
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return setvbuf(f, (char *)0, _IOLBF, BUFSIZ);
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else return setvbuf(f, (char *)0, _IOFBF, BUFSIZ);
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}
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