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realpath: prefer the buffer size given by pathconf()

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If realpath(..., NULL) doesn't work, we have to allocate a buffer
blindly.  Use the value returned from pathconf() in preference from
compile-time constants.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin 2016-02-12 01:32:57 -08:00
parent 67db8184b1
commit d7043da281
1 changed files with 12 additions and 8 deletions
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20
realpath.c
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@ -80,15 +80,19 @@ char *nasm_realpath(const char *rel_path)
int path_max = -1;
char *buf;
# ifdef PATH_MAX
path_max = PATH_MAX; /* SUSv2 */
# elif defined(MAXPATHLEN)
path_max = MAXPATHLEN; /* Solaris */
# elif defined(HAVE_PATHCONF) && defined(_PC_PATH_MAX)
path_max = pathconf(path, _PC_PATH_MAX); /* POSIX */
# endif
if (path_max < 0)
#if defined(HAVE_PATHCONF) && defined(_PC_PATH_MAX)
path_max = pathconf(rel_path, _PC_PATH_MAX); /* POSIX */
#endif
if (path_max < 0) {
#ifdef PATH_MAX
path_max = PATH_MAX; /* SUSv2 */
#elif defined(MAXPATHLEN)
path_max = MAXPATHLEN; /* Solaris */
#else
path_max = 65536; /* Crazily high, we hope */
#endif
}
buf = nasm_malloc(path_max);