diff options
Diffstat (limited to 'libbb/dirname.c')
| -rw-r--r-- | libbb/dirname.c | 60 |
1 files changed, 37 insertions, 23 deletions
diff --git a/libbb/dirname.c b/libbb/dirname.c index df9a49daa..81298730b 100644 --- a/libbb/dirname.c +++ b/libbb/dirname.c @@ -1,8 +1,8 @@ /* vi: set sw=4 ts=4: */ /* - * Mini dirname function. + * dirname implementation for busybox (for libc's missing one) * - * Copyright (C) 2001 Matt Kraai. + * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -17,39 +17,53 @@ * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +/* Note: The previous busybox implementation did not handle NULL path + * and also moved a pointer before path, which is not portable in C. + * So I replaced it with my uClibc version. */ #include <string.h> #include "libbb.h" -#if defined __UCLIBC__ || __GNU_LIBRARY___ < 5 - -/* Return a string containing the path name of the parent - * directory of PATH. */ +#if __GNU_LIBRARY__ < 5 +extern char *dirname(char *path) { - char *s; - - /* Go to the end of the string. */ - s = path + strlen(path) - 1; - - /* Strip off trailing /s (unless it is also the leading /). */ - while (path < s && s[0] == '/') - s--; + static const char null_or_empty_or_noslash[] = "."; + register char *s; + register char *last; + char *first; - /* Strip the last component. */ - while (path <= s && s[0] != '/') - s--; + last = s = path; - while (path < s && s[0] == '/') - s--; + if (s != NULL) { - if (s < path) - return "."; + LOOP: + while (*s && (*s != '/')) ++s; + first = s; + while (*s == '/') ++s; + if (*s) { + last = first; + goto LOOP; + } - s[1] = '\0'; - return path; + if (last == path) { + if (*last != '/') { + goto DOT; + } + if ((*++last == '/') && (last[1] == 0)) { + ++last; + } + } + *last = 0; + return path; + } + DOT: + return (char *) null_or_empty_or_noslash; } #endif |