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/*
* filelist.c
*
* Copyright (c) 2012 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 <string.h>
/* libalpm */
#include "filelist.h"
/* Returns the difference of the provided two lists of files.
* Pre-condition: both lists are sorted!
* When done, free the list but NOT the contained data.
*/
alpm_list_t *_alpm_filelist_difference(alpm_filelist_t *filesA,
alpm_filelist_t *filesB)
{
alpm_list_t *ret = NULL;
size_t ctrA = 0, ctrB = 0;
while(ctrA < filesA->count && ctrB < filesB->count) {
alpm_file_t *fileA = filesA->files + ctrA;
alpm_file_t *fileB = filesB->files + ctrB;
const char *strA = fileA->name;
const char *strB = fileB->name;
/* skip directories, we don't care about them */
if(strA[strlen(strA)-1] == '/') {
ctrA++;
} else if(strB[strlen(strB)-1] == '/') {
ctrB++;
} else {
int cmp = strcmp(strA, strB);
if(cmp < 0) {
/* item only in filesA, qualifies as a difference */
ret = alpm_list_add(ret, fileA);
ctrA++;
} else if(cmp > 0) {
ctrB++;
} else {
ctrA++;
ctrB++;
}
}
}
/* ensure we have completely emptied pA */
while(ctrA < filesA->count) {
alpm_file_t *fileA = filesA->files + ctrA;
const char *strA = fileA->name;
/* skip directories */
if(strA[strlen(strA)-1] != '/') {
ret = alpm_list_add(ret, fileA);
}
ctrA++;
}
return ret;
}
/* Returns the intersection of the provided two lists of files.
* Pre-condition: both lists are sorted!
* When done, free the list but NOT the contained data.
*/
alpm_list_t *_alpm_filelist_intersection(alpm_filelist_t *filesA,
alpm_filelist_t *filesB)
{
alpm_list_t *ret = NULL;
size_t ctrA = 0, ctrB = 0;
while(ctrA < filesA->count && ctrB < filesB->count) {
int cmp, isdirA, isdirB;
char *strA, *strB;
alpm_file_t *fileA = filesA->files + ctrA;
alpm_file_t *fileB = filesB->files + ctrB;
isdirA = 0;
strA = fileA->name;
if(strA[strlen(strA)-1] == '/') {
isdirA = 1;
strA = strndup(fileA->name, strlen(strA)-1);
}
isdirB = 0;
strB = fileB->name;
if(strB[strlen(strB)-1] == '/') {
isdirB = 1;
strB = strndup(fileB->name, strlen(strB)-1);
}
cmp = strcmp(strA, strB);
if(cmp < 0) {
ctrA++;
} else if(cmp > 0) {
ctrB++;
} else {
/* TODO: this creates conflicts between a symlink to a directory in
* one package and a real directory in the other. For example,
* lib -> /usr/lib in pkg1 and /lib in pkg2. This would be allowed
* when installing one package at a time _provided_ pkg1 is installed
* first. This will need adjusted if the order of package install can
* be guaranteed to install the symlink first */
/* when not directories, item in both qualifies as an intersect */
if(! (isdirA && isdirB)) {
ret = alpm_list_add(ret, fileA);
}
ctrA++;
ctrB++;
}
if(isdirA) {
free(strA);
}
if(isdirB) {
free(strB);
}
}
return ret;
}
/* Helper function for comparing files list entries
*/
int _alpm_files_cmp(const void *f1, const void *f2)
{
const alpm_file_t *file1 = f1;
const alpm_file_t *file2 = f2;
return strcmp(file1->name, file2->name);
}
alpm_file_t *alpm_filelist_contains(alpm_filelist_t *filelist,
const char *path)
{
alpm_file_t key;
if(!filelist) {
return NULL;
}
key.name = (char *)path;
return bsearch(&key, filelist->files, filelist->count,
sizeof(alpm_file_t), _alpm_files_cmp);
}
/* vim: set ts=2 sw=2 noet: */
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