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Unify filelist operation functions in conflict checking

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We had two functions that were oh so similar but slightly different. We
can combine them and add some conditional operation stuff to decide what
to return.

Signed-off-by: Dan McGee <dan@archlinux.org>
This commit is contained in:
Dan McGee 2011-03-30 20:20:16 -05:00
parent d3d18a42d2
commit 3089c833ff
1 changed files with 25 additions and 51 deletions
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76
lib/libalpm/conflict.c
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@ -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));