mirror of
https://github.com/moparisthebest/pacman
synced 2024-11-10 19:45:01 -05:00
0e18cefe38
Prevents the need to modify paths, removing strndup as an unchecked point of failure, and lengths only need to be calculated if the paths match. Also removed an old comment regarding directory/symlink compatibility. Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com> Signed-off-by: Allan McRae <allan@archlinux.org>
137 lines
3.3 KiB
C
137 lines
3.3 KiB
C
/*
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* filelist.c
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*
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* Copyright (c) 2012-2014 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 <limits.h>
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#include <string.h>
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#include <sys/stat.h>
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/* libalpm */
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#include "filelist.h"
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#include "util.h"
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/* Returns the difference of the provided two lists of files.
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* Pre-condition: both lists are sorted!
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* When done, free the list but NOT the contained data.
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*/
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alpm_list_t *_alpm_filelist_difference(alpm_filelist_t *filesA,
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alpm_filelist_t *filesB)
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{
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alpm_list_t *ret = NULL;
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size_t ctrA = 0, ctrB = 0;
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while(ctrA < filesA->count && ctrB < filesB->count) {
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char *strA = filesA->files[ctrA].name;
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char *strB = filesB->files[ctrB].name;
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int cmp = strcmp(strA, strB);
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if(cmp < 0) {
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/* item only in filesA, qualifies as a difference */
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ret = alpm_list_add(ret, strA);
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ctrA++;
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} else if(cmp > 0) {
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ctrB++;
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} else {
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ctrA++;
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ctrB++;
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}
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}
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/* ensure we have completely emptied pA */
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while(ctrA < filesA->count) {
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ret = alpm_list_add(ret, filesA->files[ctrA].name);
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ctrA++;
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}
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return ret;
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}
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static int _alpm_filelist_pathcmp(const char *p1, const char *p2)
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{
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while(*p1 && *p1 == *p2) {
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p1++;
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p2++;
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}
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/* skip trailing '/' */
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if(*p1 == '\0' && *p2 == '/') {
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p2++;
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} else if(*p2 == '\0' && *p1 == '/') {
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p1++;
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}
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return *p1 - *p2;
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}
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/* Returns the intersection of the provided two lists of files.
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* Pre-condition: both lists are sorted!
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* When done, free the list but NOT the contained data.
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*/
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alpm_list_t *_alpm_filelist_intersection(alpm_filelist_t *filesA,
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alpm_filelist_t *filesB)
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{
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alpm_list_t *ret = NULL;
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size_t ctrA = 0, ctrB = 0;
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alpm_file_t *arrA = filesA->files, *arrB = filesB->files;
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while(ctrA < filesA->count && ctrB < filesB->count) {
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const char *strA = arrA[ctrA].name, *strB = arrB[ctrB].name;
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int cmp = _alpm_filelist_pathcmp(strA, strB);
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if(cmp < 0) {
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ctrA++;
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} else if(cmp > 0) {
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ctrB++;
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} else {
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/* when not directories, item in both qualifies as an intersect */
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if(strA[strlen(strA) - 1] != '/' || strB[strlen(strB) - 1] != '/') {
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ret = alpm_list_add(ret, arrA[ctrA].name);
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}
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ctrA++;
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ctrB++;
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}
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}
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return ret;
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}
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/* Helper function for comparing files list entries
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*/
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int _alpm_files_cmp(const void *f1, const void *f2)
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{
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const alpm_file_t *file1 = f1;
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const alpm_file_t *file2 = f2;
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return strcmp(file1->name, file2->name);
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}
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alpm_file_t SYMEXPORT *alpm_filelist_contains(alpm_filelist_t *filelist,
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const char *path)
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{
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alpm_file_t key;
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if(!filelist) {
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return NULL;
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}
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key.name = (char *)path;
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return bsearch(&key, filelist->files, filelist->count,
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sizeof(alpm_file_t), _alpm_files_cmp);
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}
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/* vim: set noet: */
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