mirror of
https://github.com/moparisthebest/pacman
synced 2024-11-16 06:15:08 -05:00
136 lines
3.2 KiB
C
136 lines
3.2 KiB
C
/*
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* util-common.c
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*
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* Copyright (c) 2006-2014 Pacman Development Team <pacman-dev@archlinux.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include "util-common.h"
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/** Parse the basename of a program from a path.
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* @param path path to parse basename from
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*
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* @return everything following the final '/'
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*/
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const char *mbasename(const char *path)
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{
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const char *last = strrchr(path, '/');
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if(last) {
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return last + 1;
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}
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return path;
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}
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/** Parse the dirname of a program from a path.
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* The path returned should be freed.
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* @param path path to parse dirname from
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*
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* @return everything preceding the final '/'
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*/
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char *mdirname(const char *path)
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{
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char *ret, *last;
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/* null or empty path */
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if(path == NULL || *path == '\0') {
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return strdup(".");
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}
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if((ret = strdup(path)) == NULL) {
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return NULL;
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}
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last = strrchr(ret, '/');
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if(last != NULL) {
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/* we found a '/', so terminate our string */
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if(last == ret) {
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/* return "/" for root */
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last++;
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}
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*last = '\0';
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return ret;
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}
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/* no slash found */
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free(ret);
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return strdup(".");
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}
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/** lstat wrapper that treats /path/dirsymlink/ the same as /path/dirsymlink.
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* Linux lstat follows POSIX semantics and still performs a dereference on
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* the first, and for uses of lstat in libalpm this is not what we want.
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* @param path path to file to lstat
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* @param buf structure to fill with stat information
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* @return the return code from lstat
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*/
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int llstat(const char *path, struct stat *buf)
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{
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int ret;
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size_t len = strlen(path);
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/* strip the trailing slash if one exists */
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if(len != 0 && path[len - 1] == '/') {
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char *newpath = strdup(path);
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newpath[len - 1] = '\0';
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ret = lstat(newpath, buf);
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free(newpath);
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} else {
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ret = lstat(path, buf);
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}
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return ret;
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}
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#ifndef HAVE_STRNDUP
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/* A quick and dirty implementation derived from glibc */
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/** Determines the length of a fixed-size string.
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* @param s string to be measured
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* @param max maximum number of characters to search for the string end
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* @return length of s or max, whichever is smaller
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*/
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static size_t strnlen(const char *s, size_t max)
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{
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register const char *p;
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for(p = s; *p && max--; ++p);
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return (p - s);
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}
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/** Copies a string.
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* Returned string needs to be freed
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* @param s string to be copied
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* @param n maximum number of characters to copy
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* @return pointer to the new string on success, NULL on error
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*/
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char *strndup(const char *s, size_t n)
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{
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size_t len = strnlen(s, n);
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char *new = (char *) malloc(len + 1);
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if(new == NULL) {
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return NULL;
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}
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new[len] = '\0';
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return (char *)memcpy(new, s, len);
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}
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#endif
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/* vim: set noet: */
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