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/*
* util-common.c
*
* Copyright (c) 2006-2015 Pacman Development Team <pacman-dev@archlinux.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
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "util-common.h"
/** Parse the basename of a program from a path.
* @param path path to parse basename from
*
* @return everything following the final '/'
*/
const char *mbasename(const char *path)
{
const char *last = strrchr(path, '/');
if(last) {
return last + 1;
}
return path;
}
/** Parse the dirname of a program from a path.
* The path returned should be freed.
* @param path path to parse dirname from
*
* @return everything preceding the final '/'
*/
char *mdirname(const char *path)
{
char *ret, *last;
/* null or empty path */
if(path == NULL || *path == '\0') {
return strdup(".");
}
if((ret = strdup(path)) == NULL) {
return NULL;
}
last = strrchr(ret, '/');
if(last != NULL) {
/* we found a '/', so terminate our string */
if(last == ret) {
/* return "/" for root */
last++;
}
*last = '\0';
return ret;
}
/* no slash found */
free(ret);
return strdup(".");
}
/** lstat wrapper that treats /path/dirsymlink/ the same as /path/dirsymlink.
* Linux lstat follows POSIX semantics and still performs a dereference on
* the first, and for uses of lstat in libalpm this is not what we want.
* @param path path to file to lstat
* @param buf structure to fill with stat information
* @return the return code from lstat
*/
int llstat(char *path, struct stat *buf)
{
int ret;
char *c = NULL;
size_t len = strlen(path);
while(len > 1 && path[len - 1] == '/') {
--len;
c = path + len;
}
if(c) {
*c = '\0';
ret = lstat(path, buf);
*c = '/';
} else {
ret = lstat(path, buf);
}
return ret;
}
/** Wrapper around fgets() which properly handles EINTR
* @param s string to read into
* @param size maximum length to read
* @param stream stream to read from
* @return value returned by fgets()
*/
char *safe_fgets(char *s, int size, FILE *stream)
{
char *ret;
int errno_save = errno, ferror_save = ferror(stream);
while((ret = fgets(s, size, stream)) == NULL && !feof(stream)) {
if(errno == EINTR) {
/* clear any errors we set and try again */
errno = errno_save;
if(!ferror_save) {
clearerr(stream);
}
} else {
break;
}
}
return ret;
}
#ifndef HAVE_STRNDUP
/* A quick and dirty implementation derived from glibc */
/** Determines the length of a fixed-size string.
* @param s string to be measured
* @param max maximum number of characters to search for the string end
* @return length of s or max, whichever is smaller
*/
static size_t strnlen(const char *s, size_t max)
{
register const char *p;
for(p = s; *p && max--; ++p);
return (p - s);
}
/** Copies a string.
* Returned string needs to be freed
* @param s string to be copied
* @param n maximum number of characters to copy
* @return pointer to the new string on success, NULL on error
*/
char *strndup(const char *s, size_t n)
{
size_t len = strnlen(s, n);
char *new = (char *) malloc(len + 1);
if(new == NULL) {
return NULL;
}
new[len] = '\0';
return (char *)memcpy(new, s, len);
}
#endif
/* vim: set noet: */
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