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add support for caller-provided buffers to setvbuf

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This commit is contained in:
Rich Felker 2018-04-18 15:29:18 -04:00
parent 6019459251
commit 0b80a7b040
1 changed files with 14 additions and 11 deletions
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25
src/stdio/setvbuf.c
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@ -1,22 +1,25 @@
#include "stdio_impl.h"
/* This function makes no attempt to protect the user from his/her own
* stupidity. If called any time but when then ISO C standard specifically
* allows it, all hell can and will break loose, especially with threads!
*
* This implementation ignores all arguments except the buffering type,
* and uses the existing buffer allocated alongside the FILE object.
* In the case of stderr where the preexisting buffer is length 1, it
* is not possible to set line buffering or full buffering. */
/* The behavior of this function is undefined except when it is the first
* operation on the stream, so the presence or absence of lockign is not
* observable in a program whose behavior is defined. Thus no locking is
* performed here. No allocation of buffers is performed, but a buffer
* provided by the caller is used as long as it is suitably sized. */
int setvbuf(FILE *restrict f, char *restrict buf, int type, size_t size)
{
f->lbf = EOF;
if (type == _IONBF)
if (type == _IONBF) {
f->buf_size = 0;
else if (type == _IOLBF)
f->lbf = '\n';
} else {
if (buf && size >= UNGET) {
f->buf = (void *)buf;
f->buf_size = size - UNGET;
}
if (type == _IOLBF && f->buf_size)
f->lbf = '\n';
}
f->flags |= F_SVB;