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setvbuf: return failure if mode is invalid

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POSIX requires setvbuf to return non-zero if `mode` is not one of _IONBF,
_IOLBF, or _IOFBF.
This commit is contained in:
A. Wilcox 2019-03-12 15:31:22 -05:00 committed by Rich Felker
parent f368d9fd26
commit 00d3d577ca
1 changed files with 3 additions and 1 deletions
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4
src/stdio/setvbuf.c
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@ -12,13 +12,15 @@ int setvbuf(FILE *restrict f, char *restrict buf, int type, size_t size)
if (type == _IONBF) { if (type == _IONBF) {
f->buf_size = 0; f->buf_size = 0;
} else { } else if (type == _IOLBF || type == _IOFBF) {
if (buf && size >= UNGET) { if (buf && size >= UNGET) {
f->buf = (void *)(buf + UNGET); f->buf = (void *)(buf + UNGET);
f->buf_size = size - UNGET; f->buf_size = size - UNGET;
} }
if (type == _IOLBF && f->buf_size) if (type == _IOLBF && f->buf_size)
f->lbf = '\n'; f->lbf = '\n';
} else {
return -1;
} }
f->flags |= F_SVB; f->flags |= F_SVB;