Cleanup usages of alpm_list_find and alpm_list_remove.

* remove obsolete and unused *_cmp helper functions like deppkg_cmp and
_alpm_grp_cmp

* new alpm_list_remove_str function, used 6 times in handle.c

* remove _alpm_prov_cmp / _alpm_db_whatprovides and replace them by
a more general alpm_find_pkg_satisfiers with a cleaner implementation.
before: alpm_db_whatprovides(db, targ)
after: alpm_find_pkg_satisfiers(alpm_db_getpkgcache(db), targ)

* remove satisfycmp and replace alpm_list_find + satisfycmp usage by
_alpm_find_dep_satisfiers.
before : alpm_list_find(_alpm_db_get_pkgcache(db), dep, satisfycmp)
after : _alpm_find_dep_satisfiers(_alpm_db_get_pkgcache(db), dep)

* remove _alpm_pkgname_pkg_cmp, which was used with alpm_list_remove, and
use _alpm_pkg_find + alpm_list_remove with _alpm_pkg_cmp instead.

This commit actually get rids of all complicated and asymmetric _cmp
functions. I first thought these functions were worth it, be caused it
allowed us to reuse list_find and list_remove. But this was at the detriment
of the clarity and also the ease of use of these functions, dangerous
because of their asymmetricity.

Signed-off-by: Chantry Xavier <shiningxc@gmail.com>
Signed-off-by: Dan McGee <dan@archlinux.org>

15 files changed, 87 insertions, 142 deletions

diff --git a/lib/libalpm/add.c b/lib/libalpm/add.c
index 33898934..b8d76792 100644
--- a/lib/libalpm/add.c
+++ b/lib/libalpm/add.c
@@ -96,15 +96,6 @@ error:
 	return(-1);
 }
 
-
-/* This is still messy. We have a lot of compare functions, and we should
- * try to consolidate them as much as we can (between add and sync) */
-/*static int deppkg_cmp(const void *p1, const void *p2)
-{
-	return(strcmp(((pmdepmissing_t *)p1)->target,
-				        ((pmdepmissing_t *)p2)->target));
-}*/
-
 int _alpm_add_prepare(pmtrans_t *trans, pmdb_t *db, alpm_list_t **data)
 {
 	alpm_list_t *lp = NULL;
diff --git a/lib/libalpm/alpm.h b/lib/libalpm/alpm.h
index c6d11a5f..7cef2abc 100644
--- a/lib/libalpm/alpm.h
+++ b/lib/libalpm/alpm.h
@@ -167,7 +167,6 @@ int alpm_db_update(int level, pmdb_t *db);
 
 pmpkg_t *alpm_db_get_pkg(pmdb_t *db, const char *name);
 alpm_list_t *alpm_db_getpkgcache(pmdb_t *db);
-alpm_list_t *alpm_db_whatprovides(pmdb_t *db, const char *name);
 
 pmgrp_t *alpm_db_readgrp(pmdb_t *db, const char *name);
 alpm_list_t *alpm_db_getgrpcache(pmdb_t *db);
@@ -432,6 +431,7 @@ int alpm_depcmp(pmpkg_t *pkg, pmdepend_t *dep);
 alpm_list_t *alpm_checkdeps(pmdb_t *db, int reversedeps,
 		alpm_list_t *remove, alpm_list_t *upgrade);
 alpm_list_t *alpm_deptest(pmdb_t *db, alpm_list_t *targets);
+alpm_list_t *alpm_find_pkg_satisfiers(alpm_list_t *pkgs, const char *pkgname);
 
 const char *alpm_miss_get_target(const pmdepmissing_t *miss);
 pmdepend_t *alpm_miss_get_dep(pmdepmissing_t *miss);
diff --git a/lib/libalpm/alpm_list.c b/lib/libalpm/alpm_list.c
index ae54e190..87567402 100644
--- a/lib/libalpm/alpm_list.c
+++ b/lib/libalpm/alpm_list.c
@@ -307,7 +307,7 @@ alpm_list_t SYMEXPORT *alpm_list_remove(alpm_list_t *haystack, const void *needl
 			continue;
 		}
 		tmp = i->next;
-		if(fn(needle, i->data) == 0) {
+		if(fn(i->data, needle) == 0) {
 			/* we found a matching item */
 			if(i == haystack) {
 				/* Special case: removing the head node which has a back reference to
@@ -351,6 +351,22 @@ alpm_list_t SYMEXPORT *alpm_list_remove(alpm_list_t *haystack, const void *needl
 }
 
 /**
+ * @brief Remove a string from a list.
+ *
+ * @param haystack the list to remove the item from
+ * @param needle   the data member of the item we're removing
+ * @param data     output parameter containing data of the removed item
+ *
+ * @return the resultant list
+ */
+alpm_list_t SYMEXPORT *alpm_list_remove_str(alpm_list_t *haystack,
+		const char *needle, char **data)
+{
+	return(alpm_list_remove(haystack, (const void *)needle,
+				(alpm_list_fn_cmp)strcmp, (void **)data));
+}
+
+/**
  * @brief Create a new list without any duplicates.
  *
  * This does NOT copy data members.
@@ -586,7 +602,7 @@ void SYMEXPORT *alpm_list_find(const alpm_list_t *haystack, const void *needle,
 }
 
 /* trivial helper function for alpm_list_find_ptr */
-static int ptrcmp(const void *p, const void *q)
+static int ptr_cmp(const void *p, const void *q)
 {
 	return(p != q);
 }
@@ -603,7 +619,7 @@ static int ptrcmp(const void *p, const void *q)
  */
 void SYMEXPORT *alpm_list_find_ptr(const alpm_list_t *haystack, const void *needle)
 {
-	return(alpm_list_find(haystack, needle, ptrcmp));
+	return(alpm_list_find(haystack, needle, ptr_cmp));
 }
 
 /**
@@ -614,9 +630,11 @@ void SYMEXPORT *alpm_list_find_ptr(const alpm_list_t *haystack, const void *need
  *
  * @return `needle` if found, NULL otherwise
  */
-char SYMEXPORT *alpm_list_find_str(const alpm_list_t *haystack, const char *needle)
+char SYMEXPORT *alpm_list_find_str(const alpm_list_t *haystack,
+		const char *needle)
 {
-	return((char *)alpm_list_find(haystack, (const void*)needle, (alpm_list_fn_cmp)strcmp));
+	return((char *)alpm_list_find(haystack, (const void*)needle,
+				(alpm_list_fn_cmp)strcmp));
 }
 
 /**
diff --git a/lib/libalpm/alpm_list.h b/lib/libalpm/alpm_list.h
index b3846ba0..8dc8c5ff 100644
--- a/lib/libalpm/alpm_list.h
+++ b/lib/libalpm/alpm_list.h
@@ -57,6 +57,7 @@ alpm_list_t *alpm_list_join(alpm_list_t *first, alpm_list_t *second);
 alpm_list_t *alpm_list_mmerge(alpm_list_t *left, alpm_list_t *right, alpm_list_fn_cmp fn);
 alpm_list_t *alpm_list_msort(alpm_list_t *list, int n, alpm_list_fn_cmp fn);
 alpm_list_t *alpm_list_remove(alpm_list_t *haystack, const void *needle, alpm_list_fn_cmp fn, void **data);
+alpm_list_t *alpm_list_remove_str(alpm_list_t *haystack, const char *needle, char **data);
 alpm_list_t *alpm_list_remove_dupes(const alpm_list_t *list);
 alpm_list_t *alpm_list_strdup(const alpm_list_t *list);
 alpm_list_t *alpm_list_copy(const alpm_list_t *list);
diff --git a/lib/libalpm/db.c b/lib/libalpm/db.c
index 139e304e..df16c3c9 100644
--- a/lib/libalpm/db.c
+++ b/lib/libalpm/db.c
@@ -266,23 +266,6 @@ alpm_list_t SYMEXPORT *alpm_db_getpkgcache(pmdb_t *db)
 	return(_alpm_db_get_pkgcache(db));
 }
 
-/** Get the list of packages that a package provides
- * @param db pointer to the package database to get the package from
- * @param name name of the package
- * @return the list of packages on success, NULL on error
- */
-alpm_list_t SYMEXPORT *alpm_db_whatprovides(pmdb_t *db, const char *name)
-{
-	ALPM_LOG_FUNC;
-
-	/* Sanity checks */
-	ASSERT(handle != NULL, return(NULL));
-	ASSERT(db != NULL, return(NULL));
-	ASSERT(name != NULL && strlen(name) != 0, return(NULL));
-
-	return(_alpm_db_whatprovides(db, name));
-}
-
 /** Get a group entry from a package database
  * @param db pointer to the package database to get the group from
  * @param name of the group
@@ -364,10 +347,11 @@ void _alpm_db_free(pmdb_t *db)
 	return;
 }
 
-int _alpm_db_cmp(const void *db1, const void *db2)
+int _alpm_db_cmp(const void *d1, const void *d2)
 {
-	ALPM_LOG_FUNC;
-	return(strcmp(((pmdb_t *)db1)->treename, ((pmdb_t *)db2)->treename));
+	pmdb_t *db1 = (pmdb_t *)db1;
+	pmdb_t *db2 = (pmdb_t *)db2;
+	return(strcmp(db1->treename, db2->treename));
 }
 
 alpm_list_t *_alpm_db_search(pmdb_t *db, const alpm_list_t *needles)
@@ -533,47 +517,4 @@ pmdb_t *_alpm_db_register_sync(const char *treename)
 	return(db);
 }
 
-/* helper function for alpm_list_find and _alpm_db_whatprovides
- *
- * @return "provision.name" == needle (as string)
- */
-int _alpm_prov_cmp(const void *provision, const void *needle)
-{
-	char *tmpptr;
-	char *provname = strdup(provision);
-	int retval = 0;
-	tmpptr = strchr(provname, '=');
-
-	if(tmpptr != NULL) { /* provision-version */
-		*tmpptr='\0';
-	}
-	retval = strcmp(provname, needle);
-	free(provname);
-	return(retval);
-}
-
-/* return a alpm_list_t of packages in "db" that provide "package"
- */
-alpm_list_t *_alpm_db_whatprovides(pmdb_t *db, const char *package)
-{
-	alpm_list_t *pkgs = NULL;
-	alpm_list_t *lp;
-
-	ALPM_LOG_FUNC;
-
-	if(db == NULL || package == NULL || strlen(package) == 0) {
-		return(NULL);
-	}
-
-	for(lp = _alpm_db_get_pkgcache(db); lp; lp = lp->next) {
-		pmpkg_t *info = lp->data;
-
-		if(alpm_list_find(alpm_pkg_get_provides(info), (const void *)package, _alpm_prov_cmp)) {
-			pkgs = alpm_list_add(pkgs, info);
-		}
-	}
-
-	return(pkgs);
-}
-
 /* vim: set ts=2 sw=2 noet: */
diff --git a/lib/libalpm/db.h b/lib/libalpm/db.h
index f6e0c3c6..d500953c 100644
--- a/lib/libalpm/db.h
+++ b/lib/libalpm/db.h
@@ -55,10 +55,6 @@ alpm_list_t *_alpm_db_search(pmdb_t *db, const alpm_list_t *needles);
 pmdb_t *_alpm_db_register_local(void);
 pmdb_t *_alpm_db_register_sync(const char *treename);
 
-/* Provision */
-int _alpm_prov_cmp(const void *provision, const void *needle);
-alpm_list_t *_alpm_db_whatprovides(pmdb_t *db, const char *package);
-
 /* be.c, backend specific calls */
 int _alpm_db_open(pmdb_t *db);
 void _alpm_db_close(pmdb_t *db);
diff --git a/lib/libalpm/deps.c b/lib/libalpm/deps.c
index 9cae0e2a..818418e2 100644
--- a/lib/libalpm/deps.c
+++ b/lib/libalpm/deps.c
@@ -194,10 +194,30 @@ alpm_list_t *_alpm_sortbydeps(alpm_list_t *targets, int reverse)
 	return(newtargs);
 }
 
-/* Little helper function for alpm_list_find */
-static int satisfycmp(const void *pkg, const void *depend)
+alpm_list_t *_alpm_find_dep_satisfiers(alpm_list_t *pkgs, pmdepend_t *dep)
 {
-	return(!alpm_depcmp((pmpkg_t*) pkg, (pmdepend_t*) depend));
+	alpm_list_t *i, *ret = NULL;
+
+	for(i = pkgs; i; i = alpm_list_next(i)) {
+		pmpkg_t *pkg = i->data;
+		if(alpm_depcmp(pkg, dep)) {
+			ret = alpm_list_add(ret, pkg);
+		}
+	}
+	return(ret);
+}
+
+/** Find packages in a list that provide a given package.
+ * @param pkgs an alpm_list_t* of package to search
+ * @param pkgname the name of the package
+ * @return an alpm_list_t* of packages that provide pkgname
+ */
+alpm_list_t SYMEXPORT *alpm_find_pkg_satisfiers(alpm_list_t *pkgs, const char *pkgname)
+{
+	pmdepend_t *dep = _alpm_splitdep(pkgname);
+	alpm_list_t *res = _alpm_find_dep_satisfiers(pkgs, dep);
+	_alpm_dep_free(dep);
+	return(res);
 }
 
 /** Checks dependencies and returns missing ones in a list.
@@ -217,7 +237,7 @@ alpm_list_t SYMEXPORT *alpm_deptest(pmdb_t *db, alpm_list_t *targets)
 		target = alpm_list_getdata(i);
 		dep = _alpm_splitdep(target);
 
-		if(!alpm_list_find(_alpm_db_get_pkgcache(db), dep, satisfycmp)) {
+		if(!_alpm_find_dep_satisfiers(_alpm_db_get_pkgcache(db), dep)) {
 			ret = alpm_list_add(ret, target);
 		}
 		_alpm_dep_free(dep);
@@ -268,8 +288,8 @@ alpm_list_t SYMEXPORT *alpm_checkdeps(pmdb_t *db, int reversedeps,
 			pmdepend_t *depend = j->data;
 			/* 1. we check the upgrade list */
 			/* 2. we check database for untouched satisfying packages */
-			if(!alpm_list_find(upgrade, depend, satisfycmp) &&
-			   !alpm_list_find(dblist, depend, satisfycmp)) {
+			if(!_alpm_find_dep_satisfiers(upgrade, depend) &&
+			   !_alpm_find_dep_satisfiers(dblist, depend)) {
 				/* Unsatisfied dependency in the upgrade list */
 				char *missdepstring = alpm_dep_get_string(depend);
 				_alpm_log(PM_LOG_DEBUG, "checkdeps: missing dependency '%s' for package '%s'\n",
@@ -288,13 +308,13 @@ alpm_list_t SYMEXPORT *alpm_checkdeps(pmdb_t *db, int reversedeps,
 			pmpkg_t *lp = i->data;
 			for(j = alpm_pkg_get_depends(lp); j; j = j->next) {
 				pmdepend_t *depend = j->data;
-				pmpkg_t *causingpkg = alpm_list_find(modified, depend, satisfycmp);
+				pmpkg_t *causingpkg = alpm_list_getdata(_alpm_find_dep_satisfiers(modified, depend));
 				/* we won't break this depend, if it is already broken, we ignore it */
 				/* 1. check upgrade list for satisfiers */
 				/* 2. check dblist for satisfiers */
 				if(causingpkg &&
-				   !alpm_list_find(upgrade, depend, satisfycmp) &&
-				   !alpm_list_find(dblist, depend, satisfycmp)) {
+				   !_alpm_find_dep_satisfiers(upgrade, depend) &&
+				   !_alpm_find_dep_satisfiers(dblist, depend)) {
 					char *missdepstring = alpm_dep_get_string(depend);
 					_alpm_log(PM_LOG_DEBUG, "checkdeps: transaction would break '%s' dependency of '%s'\n",
 							missdepstring, alpm_pkg_get_name(lp));
diff --git a/lib/libalpm/deps.h b/lib/libalpm/deps.h
index fe851288..70badfd9 100644
--- a/lib/libalpm/deps.h
+++ b/lib/libalpm/deps.h
@@ -51,6 +51,7 @@ int _alpm_resolvedeps(pmdb_t *local, alpm_list_t *dbs_sync, pmpkg_t *syncpkg,
 		alpm_list_t **list, alpm_list_t *remove, pmtrans_t *trans, alpm_list_t
 		**data);
 pmdepend_t *_alpm_splitdep(const char *depstring);
+alpm_list_t *_alpm_find_dep_satisfiers(alpm_list_t *pkgs, pmdepend_t *dep);
 
 #endif /* _ALPM_DEPS_H */
 
diff --git a/lib/libalpm/group.c b/lib/libalpm/group.c
index 1cc379c6..3e080a58 100644
--- a/lib/libalpm/group.c
+++ b/lib/libalpm/group.c
@@ -56,16 +56,6 @@ void _alpm_grp_free(pmgrp_t *grp)
 	FREE(grp);
 }
 
-/* Helper function for sorting groups
- */
-int _alpm_grp_cmp(const void *g1, const void *g2)
-{
-	pmgrp_t *grp1 = (pmgrp_t *)g1;
-	pmgrp_t *grp2 = (pmgrp_t *)g2;
-
-	return(strcmp(grp1->name, grp2->name));
-}
-
 const char SYMEXPORT *alpm_grp_get_name(const pmgrp_t *grp)
 {
 	ALPM_LOG_FUNC;
diff --git a/lib/libalpm/group.h b/lib/libalpm/group.h
index 5f8fdec4..e261260c 100644
--- a/lib/libalpm/group.h
+++ b/lib/libalpm/group.h
@@ -30,7 +30,6 @@ struct __pmgrp_t {
 
 pmgrp_t *_alpm_grp_new(const char *name);
 void _alpm_grp_free(pmgrp_t *grp);
-int _alpm_grp_cmp(const void *g1, const void *g2);
 
 #endif /* _ALPM_GROUP_H */
 
diff --git a/lib/libalpm/handle.c b/lib/libalpm/handle.c
index 247ef71d..5f209d4c 100644
--- a/lib/libalpm/handle.c
+++ b/lib/libalpm/handle.c
@@ -384,7 +384,7 @@ void SYMEXPORT alpm_option_set_cachedirs(alpm_list_t *cachedirs)
 
 int SYMEXPORT alpm_option_remove_cachedir(const char *cachedir)
 {
-	void *vdata = NULL;
+	char *vdata = NULL;
 	char *newcachedir;
 	size_t cachedirlen;
 	/* verify cachedir ends in a '/' */
@@ -395,8 +395,7 @@ int SYMEXPORT alpm_option_remove_cachedir(const char *cachedir)
 	newcachedir = calloc(cachedirlen + 1, sizeof(char));
 	strncpy(newcachedir, cachedir, cachedirlen);
 	newcachedir[cachedirlen-1] = '/';
-	handle->cachedirs = alpm_list_remove(handle->cachedirs, newcachedir,
-		_alpm_str_cmp, &vdata);
+	handle->cachedirs = alpm_list_remove_str(handle->cachedirs, newcachedir, &vdata);
 	FREE(newcachedir);
 	if(vdata != NULL) {
 		FREE(vdata);
@@ -449,9 +448,8 @@ void SYMEXPORT alpm_option_set_noupgrades(alpm_list_t *noupgrade)
 
 int SYMEXPORT alpm_option_remove_noupgrade(const char *pkg)
 {
-	void *vdata = NULL;
-	handle->noupgrade = alpm_list_remove(handle->noupgrade, pkg,
-		_alpm_str_cmp, &vdata);
+	char *vdata = NULL;
+	handle->noupgrade = alpm_list_remove_str(handle->noupgrade, pkg, &vdata);
 	if(vdata != NULL) {
 		FREE(vdata);
 		return(1);
@@ -472,9 +470,8 @@ void SYMEXPORT alpm_option_set_noextracts(alpm_list_t *noextract)
 
 int SYMEXPORT alpm_option_remove_noextract(const char *pkg)
 {
-	void *vdata = NULL;
-	handle->noextract = alpm_list_remove(handle->noextract, pkg,
-		_alpm_str_cmp, &vdata);
+	char *vdata = NULL;
+	handle->noextract = alpm_list_remove_str(handle->noextract, pkg, &vdata);
 	if(vdata != NULL) {
 		FREE(vdata);
 		return(1);
@@ -495,9 +492,8 @@ void SYMEXPORT alpm_option_set_ignorepkgs(alpm_list_t *ignorepkgs)
 
 int SYMEXPORT alpm_option_remove_ignorepkg(const char *pkg)
 {
-	void *vdata = NULL;
-	handle->ignorepkg = alpm_list_remove(handle->ignorepkg, pkg,
-		_alpm_str_cmp, &vdata);
+	char *vdata = NULL;
+	handle->ignorepkg = alpm_list_remove_str(handle->ignorepkg, pkg, &vdata);
 	if(vdata != NULL) {
 		FREE(vdata);
 		return(1);
@@ -518,9 +514,8 @@ void SYMEXPORT alpm_option_set_holdpkgs(alpm_list_t *holdpkgs)
 
 int SYMEXPORT alpm_option_remove_holdpkg(const char *pkg)
 {
-	void *vdata = NULL;
-	handle->holdpkg = alpm_list_remove(handle->holdpkg, pkg,
-		_alpm_str_cmp, &vdata);
+	char *vdata = NULL;
+	handle->holdpkg = alpm_list_remove_str(handle->holdpkg, pkg, &vdata);
 	if(vdata != NULL) {
 		FREE(vdata);
 		return(1);
@@ -541,9 +536,8 @@ void SYMEXPORT alpm_option_set_ignoregrps(alpm_list_t *ignoregrps)
 
 int SYMEXPORT alpm_option_remove_ignoregrp(const char *grp)
 {
-	void *vdata = NULL;
-	handle->ignoregrp = alpm_list_remove(handle->ignoregrp, grp,
-		_alpm_str_cmp, &vdata);
+	char *vdata = NULL;
+	handle->ignoregrp = alpm_list_remove_str(handle->ignoregrp, grp, &vdata);
 	if(vdata != NULL) {
 		FREE(vdata);
 		return(1);
diff --git a/lib/libalpm/package.c b/lib/libalpm/package.c
index eabb2f3e..c39eae32 100644
--- a/lib/libalpm/package.c
+++ b/lib/libalpm/package.c
@@ -837,15 +837,9 @@ int _alpm_pkg_compare_versions(pmpkg_t *local_pkg, pmpkg_t *pkg)
  */
 int _alpm_pkg_cmp(const void *p1, const void *p2)
 {
-	pmpkg_t *pk1 = (pmpkg_t *)p1;
-	pmpkg_t *pk2 = (pmpkg_t *)p2;
-
-	return(strcmp(alpm_pkg_get_name(pk1), alpm_pkg_get_name(pk2)));
-}
-
-int _alpm_pkgname_pkg_cmp(const void *pkgname, const void *package)
-{
-	return(strcmp(alpm_pkg_get_name((pmpkg_t *) package), (char *) pkgname));
+	pmpkg_t *pkg1 = (pmpkg_t *)p1;
+	pmpkg_t *pkg2 = (pmpkg_t *)p2;
+	return(strcmp(alpm_pkg_get_name(pkg1), alpm_pkg_get_name(pkg2)));
 }
 
 /* Test for existence of a package in a alpm_list_t*
diff --git a/lib/libalpm/package.h b/lib/libalpm/package.h
index 1efa64f4..e1847ec7 100644
--- a/lib/libalpm/package.h
+++ b/lib/libalpm/package.h
@@ -79,7 +79,6 @@ pmpkg_t* _alpm_pkg_new(const char *name, const char *version);
 pmpkg_t *_alpm_pkg_dup(pmpkg_t *pkg);
 void _alpm_pkg_free(pmpkg_t *pkg);
 int _alpm_pkg_cmp(const void *p1, const void *p2);
-int _alpm_pkgname_pkg_cmp(const void *pkgname, const void *package);
 int _alpm_pkg_compare_versions(pmpkg_t *local_pkg, pmpkg_t *pkg);
 pmpkg_t *_alpm_pkg_find(alpm_list_t *haystack, const char *needle);
 int _alpm_pkg_should_ignore(pmpkg_t *pkg);
diff --git a/lib/libalpm/remove.c b/lib/libalpm/remove.c
index c70e2b9e..10ef42cc 100644
--- a/lib/libalpm/remove.c
+++ b/lib/libalpm/remove.c
@@ -119,9 +119,9 @@ static void remove_prepare_keep_needed(pmtrans_t *trans, pmdb_t *db,
 		for(i = lp; i; i = i->next) {
 			pmdepmissing_t *miss = (pmdepmissing_t *)i->data;
 			void *vpkg;
-			pmpkg_t *pkg;
-			trans->packages = alpm_list_remove(trans->packages, miss->causingpkg,
-					_alpm_pkgname_pkg_cmp, &vpkg);
+			pmpkg_t *pkg = _alpm_pkg_find(trans->packages, miss->causingpkg);
+			trans->packages = alpm_list_remove(trans->packages, pkg, _alpm_pkg_cmp,
+					&vpkg);
 			pkg = vpkg;
 			if(pkg) {
 				_alpm_log(PM_LOG_WARNING, "removing %s from the target-list\n",
diff --git a/lib/libalpm/sync.c b/lib/libalpm/sync.c
index 3743f9bb..0d6a6ee3 100644
--- a/lib/libalpm/sync.c
+++ b/lib/libalpm/sync.c
@@ -372,11 +372,8 @@ static int syncpkg_cmp(const void *s1, const void *s2)
 {
 	const pmsyncpkg_t *sp1 = s1;
 	const pmsyncpkg_t *sp2 = s2;
-	pmpkg_t *p1, *p2;
-
-	p1 = alpm_sync_get_pkg(sp1);
-	p2 = alpm_sync_get_pkg(sp2);
-
+	pmpkg_t *p1 = alpm_sync_get_pkg(sp1);
+	pmpkg_t *p2 = alpm_sync_get_pkg(sp2);
 	return(strcmp(alpm_pkg_get_name(p1), alpm_pkg_get_name(p2)));
 }
 
@@ -531,12 +528,12 @@ int _alpm_sync_prepare(pmtrans_t *trans, pmdb_t *db_local, alpm_list_t *dbs_sync
 					conflict->package1, conflict->package2);
 
 			/* if sync1 provides sync2, we remove sync2 from the targets, and vice versa */
-			if(alpm_list_find(alpm_pkg_get_provides(sync1->pkg),
-						conflict->package2, _alpm_prov_cmp)) {
+			pmdepend_t *dep1 = _alpm_splitdep(conflict->package1);
+			pmdepend_t *dep2 = _alpm_splitdep(conflict->package2);
+			if(alpm_depcmp(sync1->pkg, dep2)) {
 				rsync = sync2;
 				sync = sync1;
-			} else if(alpm_list_find(alpm_pkg_get_provides(sync2->pkg),
-						conflict->package1, _alpm_prov_cmp)) {
+			} else if(alpm_depcmp(sync2->pkg, dep1)) {
 				rsync = sync1;
 				sync = sync2;
 			} else {
@@ -551,8 +548,12 @@ int _alpm_sync_prepare(pmtrans_t *trans, pmdb_t *db_local, alpm_list_t *dbs_sync
 				}
 				alpm_list_free_inner(deps, (alpm_list_fn_free)_alpm_conflict_free);
 				alpm_list_free(deps);
+				_alpm_dep_free(dep1);
+				_alpm_dep_free(dep2);
 				goto cleanup;
 			}
+			_alpm_dep_free(dep1);
+			_alpm_dep_free(dep2);
 
 			/* Prints warning */
 			_alpm_log(PM_LOG_WARNING,