Annotation of prex/usr/lib/libc/gen/dirname.c, Revision 1.1
1.1 ! nbrk 1: /*
! 2: * Copyright (c) 1997, 2004 Todd C. Miller <Todd.Miller@courtesan.com>
! 3: *
! 4: * Permission to use, copy, modify, and distribute this software for any
! 5: * purpose with or without fee is hereby granted, provided that the above
! 6: * copyright notice and this permission notice appear in all copies.
! 7: *
! 8: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
! 9: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
! 10: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
! 11: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
! 12: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
! 13: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
! 14: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
! 15: */
! 16:
! 17: #include <errno.h>
! 18: #include <libgen.h>
! 19: #include <string.h>
! 20: #include <sys/param.h>
! 21:
! 22: char *
! 23: dirname(const char *path)
! 24: {
! 25: static char dname[MAXPATHLEN];
! 26: size_t len;
! 27: const char *endp;
! 28:
! 29: /* Empty or NULL string gets treated as "." */
! 30: if (path == NULL || *path == '\0') {
! 31: dname[0] = '.';
! 32: dname[1] = '\0';
! 33: return (dname);
! 34: }
! 35:
! 36: /* Strip any trailing slashes */
! 37: endp = path + strlen(path) - 1;
! 38: while (endp > path && *endp == '/')
! 39: endp--;
! 40:
! 41: /* Find the start of the dir */
! 42: while (endp > path && *endp != '/')
! 43: endp--;
! 44:
! 45: /* Either the dir is "/" or there are no slashes */
! 46: if (endp == path) {
! 47: dname[0] = *endp == '/' ? '/' : '.';
! 48: dname[1] = '\0';
! 49: return (dname);
! 50: } else {
! 51: /* Move forward past the separating slashes */
! 52: do {
! 53: endp--;
! 54: } while (endp > path && *endp == '/');
! 55: }
! 56:
! 57: len = endp - path + 1;
! 58: if (len >= sizeof(dname)) {
! 59: errno = ENAMETOOLONG;
! 60: return (NULL);
! 61: }
! 62: memcpy(dname, path, len);
! 63: dname[len] = '\0';
! 64: return (dname);
! 65: }
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