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-rw-r--r--lib/libalpm/conflict.c76
1 files changed, 25 insertions, 51 deletions
diff --git a/lib/libalpm/conflict.c b/lib/libalpm/conflict.c
index b4ecd659..319e49d6 100644
--- a/lib/libalpm/conflict.c
+++ b/lib/libalpm/conflict.c
@@ -212,11 +212,17 @@ alpm_list_t SYMEXPORT *alpm_checkconflicts(alpm_list_t *pkglist) {
return _alpm_innerconflicts(pkglist);
}
-/* Returns a alpm_list_t* of file conflicts.
- * Hooray for set-intersects!
- * Pre-condition: both lists are sorted!
+static const int DIFFERENCE = 0;
+static const int INTERSECT = 1;
+/* Returns a set operation on the provided two lists of files.
+ * Pre-condition: both lists are sorted!
+ *
+ * Operations:
+ * DIFFERENCE - a difference operation is performed. filesA - filesB.
+ * INTERSECT - an intersection operation is performed. filesA & filesB.
*/
-static alpm_list_t *chk_fileconflicts(alpm_list_t *filesA, alpm_list_t *filesB)
+static alpm_list_t *filelist_operation(alpm_list_t *filesA, alpm_list_t *filesB,
+ int operation)
{
alpm_list_t *ret = NULL;
alpm_list_t *pA = filesA, *pB = filesB;
@@ -224,7 +230,7 @@ static alpm_list_t *chk_fileconflicts(alpm_list_t *filesA, alpm_list_t *filesB)
while(pA && pB) {
const char *strA = pA->data;
const char *strB = pB->data;
- /* skip directories, we don't care about dir conflicts */
+ /* skip directories, we don't care about them */
if(strA[strlen(strA)-1] == '/') {
pA = pA->next;
} else if(strB[strlen(strB)-1] == '/') {
@@ -232,59 +238,26 @@ static alpm_list_t *chk_fileconflicts(alpm_list_t *filesA, alpm_list_t *filesB)
} else {
int cmp = strcmp(strA, strB);
if(cmp < 0) {
- /* item only in filesA, ignore it */
+ if(operation == DIFFERENCE) {
+ /* item only in filesA, qualifies as a difference */
+ ret = alpm_list_add(ret, strdup(strA));
+ }
pA = pA->next;
} else if(cmp > 0) {
- /* item only in filesB, ignore it */
pB = pB->next;
} else {
- /* item in both, record it */
- ret = alpm_list_add(ret, strdup(strA));
+ if(operation == INTERSECT) {
+ /* item in both, qualifies as an intersect */
+ ret = alpm_list_add(ret, strdup(strA));
+ }
pA = pA->next;
pB = pB->next;
}
}
}
- return ret;
-}
-
-/* Returns a alpm_list_t* of files that are in filesA but *NOT* in filesB
- * This is an 'A minus B' set operation
- * Pre-condition: both lists are sorted!
- */
-static alpm_list_t *chk_filedifference(alpm_list_t *filesA, alpm_list_t *filesB)
-{
- alpm_list_t *ret = NULL;
- alpm_list_t *pA = filesA, *pB = filesB;
-
- /* if both filesA and filesB have entries, do this loop */
- while(pA && pB) {
- const char *strA = pA->data;
- const char *strB = pB->data;
- /* skip directories, we don't care about dir conflicts */
- if(strA[strlen(strA)-1] == '/') {
- pA = pA->next;
- } else if(strB[strlen(strB)-1] == '/') {
- pB = pB->next;
- } else {
- int cmp = strcmp(strA, strB);
- if(cmp < 0) {
- /* item only in filesA, record it */
- ret = alpm_list_add(ret, strdup(strA));
- pA = pA->next;
- } else if(cmp > 0) {
- /* item only in fileB, but this means nothing */
- pB = pB->next;
- } else {
- /* item in both, ignore it */
- pA = pA->next;
- pB = pB->next;
- }
- }
- }
- /* ensure we have completely emptied pA */
- while(pA) {
+ /* if doing a difference, ensure we have completely emptied pA */
+ while(operation == DIFFERENCE && pA) {
const char *strA = pA->data;
/* skip directories */
if(strA[strlen(strA)-1] != '/') {
@@ -419,7 +392,8 @@ alpm_list_t *_alpm_db_find_fileconflicts(pmdb_t *db, pmtrans_t *trans,
if(!p2) {
continue;
}
- tmpfiles = chk_fileconflicts(alpm_pkg_get_files(p1), alpm_pkg_get_files(p2));
+ tmpfiles = filelist_operation( alpm_pkg_get_files(p1),
+ alpm_pkg_get_files(p2), INTERSECT);
if(tmpfiles) {
for(k = tmpfiles; k; k = k->next) {
@@ -444,8 +418,8 @@ alpm_list_t *_alpm_db_find_fileconflicts(pmdb_t *db, pmtrans_t *trans,
* is not currently installed, then simply stat the whole filelist */
if(dbpkg) {
/* older ver of package currently installed */
- tmpfiles = chk_filedifference(alpm_pkg_get_files(p1),
- alpm_pkg_get_files(dbpkg));
+ tmpfiles = filelist_operation(alpm_pkg_get_files(p1),
+ alpm_pkg_get_files(dbpkg), DIFFERENCE);
} else {
/* no version of package currently installed */
tmpfiles = alpm_list_strdup(alpm_pkg_get_files(p1));