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(<errno.h>): Include.

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(errno): Declare if not defined.
(addext): Work correctly when pathconf returns -1 and leaves
errno alone because there is no limit.  Also, work even if
pathconf returns a value greater than SIZE_MAX.
This commit is contained in:
Jim Meyering 2001-08-13 06:30:10 +00:00
parent 242256b45d
commit 7fda17ac4f
1 changed files with 24 additions and 15 deletions
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39
lib/addext.c
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@ -47,6 +47,11 @@
# include <unistd.h>
#endif
#include <errno.h>
#ifndef errno
extern int errno;
#endif
#include "backupfile.h"
#include "dirname.h"
@ -57,26 +62,30 @@ void
addext (char *filename, char const *ext, int e)
{
char *s = base_name (filename);
size_t slen = base_len (s), extlen = strlen (ext);
long slen_max = -1;
size_t slen = base_len (s);
size_t extlen = strlen (ext);
size_t slen_max = HAVE_LONG_FILE_NAMES ? 255 : _POSIX_NAME_MAX;
#if HAVE_PATHCONF && defined _PC_NAME_MAX
if (slen + extlen <= _POSIX_NAME_MAX && ! HAVE_DOS_FILE_NAMES)
/* The file name is so short there's no need to call pathconf. */
slen_max = _POSIX_NAME_MAX;
else if (s == filename)
slen_max = pathconf (".", _PC_NAME_MAX);
else
if (_POSIX_NAME_MAX < slen + extlen || HAVE_DOS_FILE_NAMES)
{
char c = *s;
if (! ISSLASH (c))
*s = 0;
slen_max = pathconf (filename, _PC_NAME_MAX);
*s = c;
/* The new base name is long enough to require a pathconf check. */
long name_max;
errno = 0;
if (s == filename)
name_max = pathconf (".", _PC_NAME_MAX);
else
{
char c = *s;
if (! ISSLASH (c))
*s = 0;
name_max = pathconf (filename, _PC_NAME_MAX);
*s = c;
}
if (0 <= name_max || errno == 0)
slen_max = name_max == (size_t) name_max ? name_max : -1;
}
#endif
if (slen_max < 0)
slen_max = HAVE_LONG_FILE_NAMES ? 255 : 14;
if (HAVE_DOS_FILE_NAMES && slen_max <= 12)
{