Various tweaks to support building with excessive GCC warning flags

This fixes a bunch of small issues in order to enable a clean
successful build with a crazy number of GCC warning flags. A lot of
these changes are covered by -Wshadow, -Wformat-security, and
-Wstrict-overflow=5.

Signed-off-by: Dan McGee <dan@archlinux.org>

lib/libalpm/deps.c

@@ -158,15 +158,17 @@ alpm_list_t *_alpm_sortbydeps(alpm_handle_t *handle,
 			else if(nextchild->state == -1) {
 				alpm_pkg_t *vertexpkg = vertex->data;
 				alpm_pkg_t *childpkg = nextchild->data;
-				const char *message;
 
 				_alpm_log(handle, ALPM_LOG_WARNING, _("dependency cycle detected:\n"));
 				if(reverse) {
-					message =_("%s will be removed after its %s dependency\n");
+					_alpm_log(handle, ALPM_LOG_WARNING,
+							_("%s will be removed after its %s dependency\n"),
+							vertexpkg->name, childpkg->name);
 				} else {
-					message =_("%s will be installed before its %s dependency\n");
+					_alpm_log(handle, ALPM_LOG_WARNING,
+							_("%s will be installed before its %s dependency\n"),
+							vertexpkg->name, childpkg->name);
 				}
-				_alpm_log(handle, ALPM_LOG_WARNING, message, vertexpkg->name, childpkg->name);
 			}
 		}
 		if(!found) {

lib/libalpm/trans.c

@@ -276,8 +276,8 @@ static int grep(const char *fn, const char *needle)
 int _alpm_runscriptlet(alpm_handle_t *handle, const char *filepath,
 		const char *script, const char *ver, const char *oldver, int is_archive)
 {
-	char cmdline[PATH_MAX];
+	char arg0[64], arg1[3], cmdline[PATH_MAX];
-	char *argv[] = { SCRIPTLET_SHELL, "-c", cmdline, NULL };
+	char *argv[] = { arg0, arg1, cmdline, NULL };
 	char *tmpdir, *scriptfn = NULL, *scriptpath;
 	int retval = 0;
 	size_t len;
@@ -293,6 +293,9 @@ int _alpm_runscriptlet(alpm_handle_t *handle, const char *filepath,
 		return 0;
 	}
 
+	strcpy(arg0, SCRIPTLET_SHELL);
+	strcpy(arg1, "-c");
+
 	/* create a directory in $root/tmp/ for copying/extracting the scriptlet */
 	len = strlen(handle->root) + strlen("tmp/alpm_XXXXXX") + 1;
 	MALLOC(tmpdir, len, RET_ERR(handle, ALPM_ERR_MEMORY, -1));

lib/libalpm/util.c

@@ -621,7 +621,9 @@ int _alpm_ldconfig(alpm_handle_t *handle)
 	if(access(line, F_OK) == 0) {
 		snprintf(line, PATH_MAX, "%ssbin/ldconfig", handle->root);
 		if(access(line, X_OK) == 0) {
-			char *argv[] = { "ldconfig", NULL };
+			char arg0[32];
+			char *argv[] = { arg0, NULL };
+			strcpy(arg0, "ldconfig");
 			return _alpm_run_chroot(handle, "/sbin/ldconfig", argv);
 		}
 	}
@@ -676,7 +678,8 @@ const char *_alpm_filecache_setup(alpm_handle_t *handle)
 {
 	struct stat buf;
 	alpm_list_t *i;
-	char *cachedir, *tmpdir;
+	char *cachedir;
+	const char *tmpdir;
 
 	/* Loop through the cache dirs until we find a usable directory */
 	for(i = handle->cachedirs; i; i = i->next) {
@@ -995,13 +998,13 @@ int _alpm_archive_fgets(struct archive *a, struct archive_read_buffer *b)
 			}
 			if(needed > b->line_size) {
 				/* need to realloc + copy data to fit total length */
-				char *new;
+				char *new_line;
-				CALLOC(new, needed, sizeof(char), b->ret = -ENOMEM; goto cleanup);
+				CALLOC(new_line, needed, sizeof(char), b->ret = -ENOMEM; goto cleanup);
-				memcpy(new, b->line, b->line_size);
+				memcpy(new_line, b->line, b->line_size);
 				b->line_size = needed;
-				b->line_offset = new + (b->line_offset - b->line);
+				b->line_offset = new_line + (b->line_offset - b->line);
 				free(b->line);
-				b->line = new;
+				b->line = new_line;
 			}
 		}
 

lib/libalpm/util.h

@@ -87,7 +87,7 @@
 #endif
 
 #define OPEN(fd, path, flags) do { fd = open(path, flags | O_BINARY); } while(fd == -1 && errno == EINTR)
-#define CLOSE(fd) do { int ret; do { ret = close(fd); } while(ret == -1 && errno == EINTR); } while(0)
+#define CLOSE(fd) do { int _ret; do { _ret = close(fd); } while(_ret == -1 && errno == EINTR); } while(0)
 
 /**
  * Used as a buffer/state holder for _alpm_archive_fgets().

src/pacman/conf.c

@@ -202,14 +202,14 @@ static int download_with_xfercommand(const char *url, const char *localpath,
 cleanup:
 	/* restore the old cwd if we have it */
 	if(cwdfd >= 0) {
-		int ret;
+		int close_ret;
 		if(fchdir(cwdfd) != 0) {
 			pm_printf(ALPM_LOG_ERROR, _("could not restore working directory (%s)\n"),
 					strerror(errno));
 		}
 		do {
-			ret = close(cwdfd);
+			close_ret = close(cwdfd);
-		} while(ret == -1 && errno == EINTR);
+		} while(close_ret == -1 && errno == EINTR);
 	}
 
 	if(ret == -1) {

src/pacman/pacman.c

@@ -808,12 +808,13 @@ int main(int argc, char *argv[])
 
 	/* we support reading targets from stdin if a cmdline parameter is '-' */
 	if(!isatty(fileno(stdin)) && alpm_list_find_str(pm_targets, "-")) {
-		size_t current_size = PATH_MAX, i = 0;
+		size_t current_size = PATH_MAX;
 		char *line = malloc(current_size);
 
 		/* remove the '-' from the list */
 		pm_targets = alpm_list_remove_str(pm_targets, "-", NULL);
 
+		i = 0;
 		while((line[i] = (char)fgetc(stdin)) != EOF) {
 			if(isspace((unsigned char)line[i])) {
 				/* avoid adding zero length arg when multiple spaces separate args */
@@ -885,13 +886,13 @@ int main(int argc, char *argv[])
 #endif
 
 	if(config->verbose > 0) {
-		alpm_list_t *i;
+		alpm_list_t *j;
 		printf("Root      : %s\n", alpm_option_get_root(config->handle));
 		printf("Conf File : %s\n", config->configfile);
 		printf("DB Path   : %s\n", alpm_option_get_dbpath(config->handle));
 		printf("Cache Dirs: ");
-		for(i = alpm_option_get_cachedirs(config->handle); i; i = alpm_list_next(i)) {
+		for(j = alpm_option_get_cachedirs(config->handle); j; j = alpm_list_next(j)) {
-			printf("%s  ", (const char *)i->data);
+			printf("%s  ", (const char *)j->data);
 		}
 		printf("\n");
 		printf("Lock File : %s\n", alpm_option_get_lockfile(config->handle));

src/pacman/sync.c

@@ -307,12 +307,12 @@ static int sync_cleancache(int level)
 static int sync_synctree(int level, alpm_list_t *syncs)
 {
 	alpm_list_t *i;
-	int success = 0, ret;
+	unsigned int success = 0;
 
 	for(i = syncs; i; i = alpm_list_next(i)) {
 		alpm_db_t *db = i->data;
 
-		ret = alpm_db_update((level < 2 ? 0 : 1), db);
+		int ret = alpm_db_update((level < 2 ? 0 : 1), db);
 		if(ret < 0) {
 			pm_printf(ALPM_LOG_ERROR, _("failed to update %s (%s)\n"),
 					alpm_db_get_name(db), alpm_strerror(alpm_errno(config->handle)));

src/pacman/util.c

@@ -258,7 +258,7 @@ void indentprint(const char *str, unsigned short indent, unsigned short cols)
 {
 	wchar_t *wcstr;
 	const wchar_t *p;
-	int len, cidx;
+	size_t len, cidx;
 
 	if(!str) {
 		return;