Add ALPM_ERR_OK to _alpm_errno_t

This allows functions which return an _alpm_errno_t to always return a
genuine _alpm_errno_t for consistency, even in cases where there are
no errors. Since ALPM_ERR_OK = 0, their callers can still simply check
'err = some_fn(); if (!err) { ... }'.

Signed-off-by: Ivy Foster <ivy.foster@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

9 files changed, 61 insertions, 60 deletions

diff --git a/lib/libalpm/alpm.h b/lib/libalpm/alpm.h
index 7955585a..0f8274bb 100644
--- a/lib/libalpm/alpm.h
+++ b/lib/libalpm/alpm.h
@@ -53,7 +53,8 @@ typedef struct __alpm_trans_t alpm_trans_t;
  * @{
  */
 typedef enum _alpm_errno_t {
-	ALPM_ERR_MEMORY = 1,
+	ALPM_ERR_OK = 0,
+	ALPM_ERR_MEMORY,
 	ALPM_ERR_SYSTEM,
 	ALPM_ERR_BADPERMS,
 	ALPM_ERR_NOT_A_FILE,
diff --git a/lib/libalpm/be_package.c b/lib/libalpm/be_package.c
index 430d2aeb..befcba31 100644
--- a/lib/libalpm/be_package.c
+++ b/lib/libalpm/be_package.c
@@ -274,7 +274,7 @@ int _alpm_pkg_validate_internal(alpm_handle_t *handle,
 		alpm_siglist_t **sigdata, alpm_pkgvalidation_t *validation)
 {
 	int has_sig;
-	handle->pm_errno = 0;
+	handle->pm_errno = ALPM_ERR_OK;
 
 	if(pkgfile == NULL || strlen(pkgfile) == 0) {
 		RET_ERR(handle, ALPM_ERR_WRONG_ARGS, -1);
diff --git a/lib/libalpm/be_sync.c b/lib/libalpm/be_sync.c
index a8362778..856aa420 100644
--- a/lib/libalpm/be_sync.c
+++ b/lib/libalpm/be_sync.c
@@ -186,7 +186,7 @@ int SYMEXPORT alpm_db_update(int force, alpm_db_t *db)
 	/* Sanity checks */
 	ASSERT(db != NULL, return -1);
 	handle = db->handle;
-	handle->pm_errno = 0;
+	handle->pm_errno = ALPM_ERR_OK;
 	ASSERT(db != handle->db_local, RET_ERR(handle, ALPM_ERR_WRONG_ARGS, -1));
 	ASSERT(db->servers != NULL, RET_ERR(handle, ALPM_ERR_SERVER_NONE, -1));
 
@@ -330,7 +330,7 @@ int SYMEXPORT alpm_db_update(int force, alpm_db_t *db)
 		_alpm_log(handle, ALPM_LOG_DEBUG, "failed to sync db: %s\n",
 				alpm_strerror(handle->pm_errno));
 	} else {
-		handle->pm_errno = 0;
+		handle->pm_errno = ALPM_ERR_OK;
 	}
 
 	_alpm_handle_unlock(handle);
diff --git a/lib/libalpm/db.c b/lib/libalpm/db.c
index f70f83c1..46d2ccf3 100644
--- a/lib/libalpm/db.c
+++ b/lib/libalpm/db.c
@@ -112,7 +112,7 @@ int SYMEXPORT alpm_db_unregister(alpm_db_t *db)
 	ASSERT(db != NULL, return -1);
 	/* Do not unregister a database if a transaction is on-going */
 	handle = db->handle;
-	handle->pm_errno = 0;
+	handle->pm_errno = ALPM_ERR_OK;
 	ASSERT(handle->trans == NULL, RET_ERR(handle, ALPM_ERR_TRANS_NOT_NULL, -1));
 
 	if(db == handle->db_local) {
@@ -179,7 +179,7 @@ int SYMEXPORT alpm_db_add_server(alpm_db_t *db, const char *url)
 
 	/* Sanity checks */
 	ASSERT(db != NULL, return -1);
-	db->handle->pm_errno = 0;
+	db->handle->pm_errno = ALPM_ERR_OK;
 	ASSERT(url != NULL && strlen(url) != 0, RET_ERR(db->handle, ALPM_ERR_WRONG_ARGS, -1));
 
 	newurl = sanitize_url(url);
@@ -206,7 +206,7 @@ int SYMEXPORT alpm_db_remove_server(alpm_db_t *db, const char *url)
 
 	/* Sanity checks */
 	ASSERT(db != NULL, return -1);
-	db->handle->pm_errno = 0;
+	db->handle->pm_errno = ALPM_ERR_OK;
 	ASSERT(url != NULL && strlen(url) != 0, RET_ERR(db->handle, ALPM_ERR_WRONG_ARGS, -1));
 
 	newurl = sanitize_url(url);
@@ -249,7 +249,7 @@ alpm_siglevel_t SYMEXPORT alpm_db_get_siglevel(alpm_db_t *db)
 int SYMEXPORT alpm_db_get_valid(alpm_db_t *db)
 {
 	ASSERT(db != NULL, return -1);
-	db->handle->pm_errno = 0;
+	db->handle->pm_errno = ALPM_ERR_OK;
 	return db->ops->validate(db);
 }
 
@@ -258,7 +258,7 @@ alpm_pkg_t SYMEXPORT *alpm_db_get_pkg(alpm_db_t *db, const char *name)
 {
 	alpm_pkg_t *pkg;
 	ASSERT(db != NULL, return NULL);
-	db->handle->pm_errno = 0;
+	db->handle->pm_errno = ALPM_ERR_OK;
 	ASSERT(name != NULL && strlen(name) != 0,
 			RET_ERR(db->handle, ALPM_ERR_WRONG_ARGS, NULL));
 
@@ -273,7 +273,7 @@ alpm_pkg_t SYMEXPORT *alpm_db_get_pkg(alpm_db_t *db, const char *name)
 alpm_list_t SYMEXPORT *alpm_db_get_pkgcache(alpm_db_t *db)
 {
 	ASSERT(db != NULL, return NULL);
-	db->handle->pm_errno = 0;
+	db->handle->pm_errno = ALPM_ERR_OK;
 	return _alpm_db_get_pkgcache(db);
 }
 
@@ -292,7 +292,7 @@ alpm_group_t SYMEXPORT *alpm_db_get_group(alpm_db_t *db, const char *name)
 alpm_list_t SYMEXPORT *alpm_db_get_groupcache(alpm_db_t *db)
 {
 	ASSERT(db != NULL, return NULL);
-	db->handle->pm_errno = 0;
+	db->handle->pm_errno = ALPM_ERR_OK;
 
 	return _alpm_db_get_groupcache(db);
 }
@@ -301,7 +301,7 @@ alpm_list_t SYMEXPORT *alpm_db_get_groupcache(alpm_db_t *db)
 alpm_list_t SYMEXPORT *alpm_db_search(alpm_db_t *db, const alpm_list_t *needles)
 {
 	ASSERT(db != NULL, return NULL);
-	db->handle->pm_errno = 0;
+	db->handle->pm_errno = ALPM_ERR_OK;
 
 	return _alpm_db_search(db, needles);
 }
diff --git a/lib/libalpm/dload.c b/lib/libalpm/dload.c
index dc57c929..9d803580 100644
--- a/lib/libalpm/dload.c
+++ b/lib/libalpm/dload.c
@@ -412,7 +412,7 @@ static int curl_download_internal(struct dload_payload *payload,
 	/* shortcut to our handle within the payload */
 	alpm_handle_t *handle = payload->handle;
 	CURL *curl = get_libcurl_handle(handle);
-	handle->pm_errno = 0;
+	handle->pm_errno = ALPM_ERR_OK;
 
 	/* make sure these are NULL */
 	FREE(payload->tempfile_name);
diff --git a/lib/libalpm/package.c b/lib/libalpm/package.c
index f08df8b2..a666bf05 100644
--- a/lib/libalpm/package.c
+++ b/lib/libalpm/package.c
@@ -60,7 +60,7 @@ int SYMEXPORT alpm_pkg_checkmd5sum(alpm_pkg_t *pkg)
 	int retval;
 
 	ASSERT(pkg != NULL, return -1);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	/* We only inspect packages from sync repositories */
 	ASSERT(pkg->origin == ALPM_PKG_FROM_SYNCDB,
 			RET_ERR(pkg->handle, ALPM_ERR_WRONG_ARGS, -1));
@@ -184,196 +184,196 @@ struct pkg_operations default_pkg_ops = {
 const char SYMEXPORT *alpm_pkg_get_filename(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->filename;
 }
 
 const char SYMEXPORT *alpm_pkg_get_base(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->get_base(pkg);
 }
 
 const char SYMEXPORT *alpm_pkg_get_name(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->name;
 }
 
 const char SYMEXPORT *alpm_pkg_get_version(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->version;
 }
 
 alpm_pkgfrom_t SYMEXPORT alpm_pkg_get_origin(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return -1);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->origin;
 }
 
 const char SYMEXPORT *alpm_pkg_get_desc(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->get_desc(pkg);
 }
 
 const char SYMEXPORT *alpm_pkg_get_url(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->get_url(pkg);
 }
 
 alpm_time_t SYMEXPORT alpm_pkg_get_builddate(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return -1);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->get_builddate(pkg);
 }
 
 alpm_time_t SYMEXPORT alpm_pkg_get_installdate(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return -1);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->get_installdate(pkg);
 }
 
 const char SYMEXPORT *alpm_pkg_get_packager(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->get_packager(pkg);
 }
 
 const char SYMEXPORT *alpm_pkg_get_md5sum(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->md5sum;
 }
 
 const char SYMEXPORT *alpm_pkg_get_sha256sum(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->sha256sum;
 }
 
 const char SYMEXPORT *alpm_pkg_get_base64_sig(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->base64_sig;
 }
 
 const char SYMEXPORT *alpm_pkg_get_arch(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->get_arch(pkg);
 }
 
 off_t SYMEXPORT alpm_pkg_get_size(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return -1);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->size;
 }
 
 off_t SYMEXPORT alpm_pkg_get_isize(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return -1);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->get_isize(pkg);
 }
 
 alpm_pkgreason_t SYMEXPORT alpm_pkg_get_reason(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return -1);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->get_reason(pkg);
 }
 
 alpm_pkgvalidation_t SYMEXPORT alpm_pkg_get_validation(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return -1);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->get_validation(pkg);
 }
 
 alpm_list_t SYMEXPORT *alpm_pkg_get_licenses(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->get_licenses(pkg);
 }
 
 alpm_list_t SYMEXPORT *alpm_pkg_get_groups(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->get_groups(pkg);
 }
 
 alpm_list_t SYMEXPORT *alpm_pkg_get_depends(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->get_depends(pkg);
 }
 
 alpm_list_t SYMEXPORT *alpm_pkg_get_optdepends(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->get_optdepends(pkg);
 }
 
 alpm_list_t SYMEXPORT *alpm_pkg_get_conflicts(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->get_conflicts(pkg);
 }
 
 alpm_list_t SYMEXPORT *alpm_pkg_get_provides(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->get_provides(pkg);
 }
 
 alpm_list_t SYMEXPORT *alpm_pkg_get_replaces(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->get_replaces(pkg);
 }
 
 alpm_list_t SYMEXPORT *alpm_pkg_get_deltas(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->deltas;
 }
 
 alpm_filelist_t SYMEXPORT *alpm_pkg_get_files(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->get_files(pkg);
 }
 
 alpm_list_t SYMEXPORT *alpm_pkg_get_backup(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->get_backup(pkg);
 }
 
@@ -382,7 +382,7 @@ alpm_db_t SYMEXPORT *alpm_pkg_get_db(alpm_pkg_t *pkg)
 	/* Sanity checks */
 	ASSERT(pkg != NULL, return NULL);
 	ASSERT(pkg->origin != ALPM_PKG_FROM_FILE, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 
 	return pkg->origin_data.db;
 }
@@ -391,7 +391,7 @@ alpm_db_t SYMEXPORT *alpm_pkg_get_db(alpm_pkg_t *pkg)
 void SYMEXPORT *alpm_pkg_changelog_open(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->changelog_open(pkg);
 }
 
@@ -400,7 +400,7 @@ size_t SYMEXPORT alpm_pkg_changelog_read(void *ptr, size_t size,
 		const alpm_pkg_t *pkg, void *fp)
 {
 	ASSERT(pkg != NULL, return 0);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->changelog_read(ptr, size, pkg, fp);
 }
 
@@ -408,7 +408,7 @@ size_t SYMEXPORT alpm_pkg_changelog_read(void *ptr, size_t size,
 int SYMEXPORT alpm_pkg_changelog_close(const alpm_pkg_t *pkg, void *fp)
 {
 	ASSERT(pkg != NULL, return -1);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->changelog_close(pkg, fp);
 }
 
@@ -416,7 +416,7 @@ int SYMEXPORT alpm_pkg_changelog_close(const alpm_pkg_t *pkg, void *fp)
 struct archive SYMEXPORT *alpm_pkg_mtree_open(alpm_pkg_t * pkg)
 {
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->mtree_open(pkg);
 }
 
@@ -425,7 +425,7 @@ int SYMEXPORT alpm_pkg_mtree_next(const alpm_pkg_t * pkg, struct archive *archiv
 	struct archive_entry **entry)
 {
 	ASSERT(pkg != NULL, return -1);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->mtree_next(pkg, archive, entry);
 }
 
@@ -433,14 +433,14 @@ int SYMEXPORT alpm_pkg_mtree_next(const alpm_pkg_t * pkg, struct archive *archiv
 int SYMEXPORT alpm_pkg_mtree_close(const alpm_pkg_t * pkg, struct archive *archive)
 {
 	ASSERT(pkg != NULL, return -1);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->mtree_close(pkg, archive);
 }
 
 int SYMEXPORT alpm_pkg_has_scriptlet(alpm_pkg_t *pkg)
 {
 	ASSERT(pkg != NULL, return -1);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 	return pkg->ops->has_scriptlet(pkg);
 }
 
@@ -448,7 +448,7 @@ static void find_requiredby(alpm_pkg_t *pkg, alpm_db_t *db, alpm_list_t **reqs,
 		int optional)
 {
 	const alpm_list_t *i;
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 
 	for(i = _alpm_db_get_pkgcache(db); i; i = i->next) {
 		alpm_pkg_t *cachepkg = i->data;
@@ -478,7 +478,7 @@ static alpm_list_t *compute_requiredby(alpm_pkg_t *pkg, int optional)
 	alpm_db_t *db;
 
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 
 	if(pkg->origin == ALPM_PKG_FROM_FILE) {
 		/* The sane option; search locally for things that require this. */
diff --git a/lib/libalpm/signing.c b/lib/libalpm/signing.c
index 6557c200..527e763f 100644
--- a/lib/libalpm/signing.c
+++ b/lib/libalpm/signing.c
@@ -771,7 +771,7 @@ int _alpm_check_pgp_helper(alpm_handle_t *handle, const char *path,
 	if(ret && handle->pm_errno == ALPM_ERR_SIG_MISSING) {
 		if(optional) {
 			_alpm_log(handle, ALPM_LOG_DEBUG, "missing optional signature\n");
-			handle->pm_errno = 0;
+			handle->pm_errno = ALPM_ERR_OK;
 			ret = 0;
 		} else {
 			_alpm_log(handle, ALPM_LOG_DEBUG, "missing required signature\n");
@@ -931,7 +931,7 @@ int SYMEXPORT alpm_pkg_check_pgp_signature(alpm_pkg_t *pkg,
 {
 	ASSERT(pkg != NULL, return -1);
 	ASSERT(siglist != NULL, RET_ERR(pkg->handle, ALPM_ERR_WRONG_ARGS, -1));
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 
 	return _alpm_gpgme_checksig(pkg->handle, pkg->filename,
 			pkg->base64_sig, siglist);
@@ -948,7 +948,7 @@ int SYMEXPORT alpm_db_check_pgp_signature(alpm_db_t *db,
 {
 	ASSERT(db != NULL, return -1);
 	ASSERT(siglist != NULL, RET_ERR(db->handle, ALPM_ERR_WRONG_ARGS, -1));
-	db->handle->pm_errno = 0;
+	db->handle->pm_errno = ALPM_ERR_OK;
 
 	return _alpm_gpgme_checksig(db->handle, _alpm_db_path(db), NULL, siglist);
 }
diff --git a/lib/libalpm/sync.c b/lib/libalpm/sync.c
index 00b68d05..65c1bbc6 100644
--- a/lib/libalpm/sync.c
+++ b/lib/libalpm/sync.c
@@ -57,7 +57,7 @@ alpm_pkg_t SYMEXPORT *alpm_sync_newversion(alpm_pkg_t *pkg, alpm_list_t *dbs_syn
 	alpm_pkg_t *spkg = NULL;
 
 	ASSERT(pkg != NULL, return NULL);
-	pkg->handle->pm_errno = 0;
+	pkg->handle->pm_errno = ALPM_ERR_OK;
 
 	for(i = dbs_sync; !spkg && i; i = i->next) {
 		alpm_db_t *db = i->data;
@@ -460,7 +460,7 @@ int _alpm_sync_prepare(alpm_handle_t *handle, alpm_list_t **data)
 				   transaction. The packages will be removed from the actual
 				   transaction when the transaction packages are replaced with a
 				   dependency-reordered list below */
-				handle->pm_errno = 0;
+				handle->pm_errno = ALPM_ERR_OK;
 				if(data) {
 					alpm_list_free_inner(*data,
 							(alpm_list_fn_free)alpm_depmissing_free);
@@ -1195,7 +1195,7 @@ static int check_validity(alpm_handle_t *handle,
 		}
 		alpm_list_free(errors);
 
-		if(!handle->pm_errno) {
+		if(handle->pm_errno == ALPM_ERR_OK) {
 			RET_ERR(handle, ALPM_ERR_PKG_INVALID, -1);
 		}
 		return -1;
@@ -1280,7 +1280,7 @@ static int load_packages(alpm_handle_t *handle, alpm_list_t **data,
 	EVENT(handle, &event);
 
 	if(errors) {
-		if(!handle->pm_errno) {
+		if(handle->pm_errno == ALPM_ERR_OK) {
 			RET_ERR(handle, ALPM_ERR_PKG_INVALID, -1);
 		}
 		return -1;
diff --git a/lib/libalpm/util.h b/lib/libalpm/util.h
index 5a2c105d..b9c5c172 100644
--- a/lib/libalpm/util.h
+++ b/lib/libalpm/util.h
@@ -77,7 +77,7 @@ void _alpm_alloc_fail(size_t size);
 
 #define DOUBLE_EQ(x, y) (fabs((x) - (y)) < DBL_EPSILON)
 
-#define CHECK_HANDLE(handle, action) do { if(!(handle)) { action; } (handle)->pm_errno = 0; } while(0)
+#define CHECK_HANDLE(handle, action) do { if(!(handle)) { action; } (handle)->pm_errno = ALPM_ERR_OK; } while(0)
 
 /** Standard buffer size used throughout the library. */
 #ifdef BUFSIZ