To improve conflict checking, we will need to make these functions diverge to an extent where having two separate functions will be preferable.
Signed-off-by: Allan McRae <[email protected]> --- lib/libalpm/conflict.c | 79 +++++++++++++++++++++++++++++++++----------------- 1 file changed, 53 insertions(+), 26 deletions(-) diff --git a/lib/libalpm/conflict.c b/lib/libalpm/conflict.c index 7494fd7..f3b269f 100644 --- a/lib/libalpm/conflict.c +++ b/lib/libalpm/conflict.c @@ -213,18 +213,12 @@ alpm_list_t SYMEXPORT *alpm_checkconflicts(alpm_handle_t *handle, return _alpm_innerconflicts(handle, pkglist); } -static const int DIFFERENCE = 0; -static const int INTERSECT = 1; -/* Returns a set operation on the provided two lists of files. +/* 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. - * - * Operations: - * DIFFERENCE - a difference operation is performed. filesA - filesB. - * INTERSECT - an intersection operation is performed. filesA & filesB. */ -static alpm_list_t *filelist_operation(alpm_filelist_t *filesA, - alpm_filelist_t *filesB, int operation) +static alpm_list_t *filelist_difference(alpm_filelist_t *filesA, + alpm_filelist_t *filesB) { alpm_list_t *ret = NULL; size_t ctrA = 0, ctrB = 0; @@ -242,26 +236,20 @@ static alpm_list_t *filelist_operation(alpm_filelist_t *filesA, } else { int cmp = strcmp(strA, strB); if(cmp < 0) { - if(operation == DIFFERENCE) { - /* item only in filesA, qualifies as a difference */ - ret = alpm_list_add(ret, fileA); - } + /* item only in filesA, qualifies as a difference */ + ret = alpm_list_add(ret, fileA); ctrA++; } else if(cmp > 0) { ctrB++; } else { - if(operation == INTERSECT) { - /* item in both, qualifies as an intersect */ - ret = alpm_list_add(ret, fileA); - } ctrA++; ctrB++; } - } + } } - /* if doing a difference, ensure we have completely emptied pA */ - while(operation == DIFFERENCE && ctrA < filesA->count) { + /* ensure we have completely emptied pA */ + while(ctrA < filesA->count) { alpm_file_t *fileA = filesA->files + ctrA; const char *strA = fileA->name; /* skip directories */ @@ -274,6 +262,45 @@ static alpm_list_t *filelist_operation(alpm_filelist_t *filesA, 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. + */ + +static alpm_list_t *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) { + 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) { + ctrA++; + } else if(cmp > 0) { + ctrB++; + } else { + /* item in both, qualifies as an intersect */ + ret = alpm_list_add(ret, fileA); + ctrA++; + ctrB++; + } + } + } + + return ret; +} + /* Adds alpm_fileconflict_t to a conflicts list. Pass the conflicts list, the * conflicting file path, and either two packages or one package and NULL. */ @@ -438,8 +465,8 @@ alpm_list_t *_alpm_db_find_fileconflicts(alpm_handle_t *handle, for(j = i->next; j; j = j->next) { alpm_list_t *common_files; alpm_pkg_t *p2 = j->data; - common_files = filelist_operation(alpm_pkg_get_files(p1), - alpm_pkg_get_files(p2), INTERSECT); + common_files = filelist_intersection(alpm_pkg_get_files(p1), + alpm_pkg_get_files(p2)); if(common_files) { alpm_list_t *k; @@ -471,8 +498,8 @@ alpm_list_t *_alpm_db_find_fileconflicts(alpm_handle_t *handle, if(dbpkg) { alpm_list_t *difference; /* older ver of package currently installed */ - difference = filelist_operation(alpm_pkg_get_files(p1), - alpm_pkg_get_files(dbpkg), DIFFERENCE); + difference = filelist_difference(alpm_pkg_get_files(p1), + alpm_pkg_get_files(dbpkg)); tmpfiles.count = alpm_list_count(difference); tmpfiles.files = alpm_list_to_array(difference, tmpfiles.count, sizeof(alpm_file_t)); @@ -604,7 +631,7 @@ alpm_list_t *_alpm_db_find_fileconflicts(alpm_handle_t *handle, if(handle->pm_errno == ALPM_ERR_MEMORY) { FREELIST(conflicts); if(dbpkg) { - /* only freed if it was generated from filelist_operation() */ + /* only freed if it was generated from filelist_difference() */ free(tmpfiles.files); } return NULL; @@ -612,7 +639,7 @@ alpm_list_t *_alpm_db_find_fileconflicts(alpm_handle_t *handle, } } if(dbpkg) { - /* only freed if it was generated from filelist_operation() */ + /* only freed if it was generated from filelist_difference() */ free(tmpfiles.files); } } -- 1.7.11.2
