scc

simple c99 compiler
git clone git://git.simple-cc.org/scc
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_flsbuf.c (313B)

      1 #include <errno.h>
      2 #include <stdio.h>
      3 
      4 #include "../libc.h"
      5 #include "../syscall.h"
      6 
      7 int
      8 _flsbuf(FILE *fp)
      9 {
     10 	size_t cnt;
     11 
     12 	if (fp->flags&_IOREAD)
     13 		return 0;
     14 
     15 	cnt = fp->wp - fp->buf;
     16 	if (cnt > 0 && _write(fp->fd, fp->buf, cnt) != cnt) {
     17 		fp->flags |= _IOERR;
     18 		return EOF;
     19 	}
     20 	fp->wp = fp->buf;
     21 
     22 	return 0;
     23 }