From b7f61aa55755d95d2e3a6dd7058971c68276c369 Mon Sep 17 00:00:00 2001
From: morganamilo <morganamilo@archlinux.org>
Date: Wed, 27 Nov 2019 17:45:20 +0000
Subject: pacman: print error when -Fx is given invalid regex

When processing the targets for -Fx, compile all the regex ahead of
time, printing an error for each that failed to compile. Then, if they all
compiled successfully, continue with printing files.

Signed-off-by: morganamilo <morganamilo@archlinux.org>
Signed-off-by: Allan McRae <allan@archlinux.org>
---
 src/pacman/files.c | 57 +++++++++++++++++++++++++++++++++++++++++-------------
 1 file changed, 44 insertions(+), 13 deletions(-)

diff --git a/src/pacman/files.c b/src/pacman/files.c
index 3b6dc23b..7b0c884b 100644
--- a/src/pacman/files.c
+++ b/src/pacman/files.c
@@ -94,17 +94,27 @@ static void print_match(alpm_list_t *match, alpm_db_t *repo, alpm_pkg_t *pkg, in
 	}
 }
 
+struct filetarget {
+	char *targ;
+	int exact_file;
+	regex_t reg;
+};
+
+static void filetarget_free(struct filetarget *ftarg) {
+	regfree(&ftarg->reg);
+	/* do not free ftarg->targ as it is owned by the caller of files_search */
+	free(ftarg);
+}
+
 static int files_search(alpm_list_t *syncs, alpm_list_t *targets, int regex) {
 	int ret = 0;
-	alpm_list_t *t;
+	alpm_list_t *t, *filetargs = NULL;
 
 	for(t = targets; t; t = alpm_list_next(t)) {
 		char *targ = t->data;
-		alpm_list_t *s;
-		int found = 0;
-		regex_t reg;
 		size_t len = strlen(targ);
 		int exact_file = strchr(targ, '/') != NULL;
+		regex_t reg;
 
 		if(exact_file) {
 			while(len > 1 && targ[0] == '/') {
@@ -115,11 +125,33 @@ static int files_search(alpm_list_t *syncs, alpm_list_t *targets, int regex) {
 
 		if(regex) {
 			if(regcomp(&reg, targ, REG_EXTENDED | REG_NOSUB | REG_ICASE | REG_NEWLINE) != 0) {
-				/* TODO: error message */
-				goto notfound;
+				pm_printf(ALPM_LOG_ERROR,
+						_("invalid regular expression '%s'\n"), targ);
+				ret = 1;
+				continue;
 			}
 		}
 
+		struct filetarget *ftarg = malloc(sizeof(struct filetarget));
+		ftarg->targ = targ;
+		ftarg->exact_file = exact_file;
+		ftarg->reg = reg;
+
+		filetargs = alpm_list_add(filetargs, ftarg);
+	}
+
+	if(ret != 0) {
+		goto cleanup;
+	}
+
+	for(t = filetargs; t; t = alpm_list_next(t)) {
+		struct filetarget *ftarg = t->data;
+		char *targ = ftarg->targ;
+		regex_t *reg = &ftarg->reg;
+		int exact_file = ftarg->exact_file;
+		alpm_list_t *s;
+		int found = 0;
+
 		for(s = syncs; s; s = alpm_list_next(s)) {
 			alpm_list_t *p;
 			alpm_db_t *repo = s->data;
@@ -135,7 +167,7 @@ static int files_search(alpm_list_t *syncs, alpm_list_t *targets, int regex) {
 					if (regex) {
 						for(size_t f = 0; f < files->count; f++) {
 							char *c = files->files[f].name;
-							if(regexec(&reg, c, 0, 0, 0) == 0) {
+							if(regexec(reg, c, 0, 0, 0) == 0) {
 								match = alpm_list_add(match, files->files[f].name);
 								found = 1;
 							}
@@ -151,7 +183,7 @@ static int files_search(alpm_list_t *syncs, alpm_list_t *targets, int regex) {
 						char *c = strrchr(files->files[f].name, '/');
 						if(c && *(c + 1)) {
 							if(regex) {
-								m = regexec(&reg, (c + 1), 0, 0, 0);
+								m = regexec(reg, (c + 1), 0, 0, 0);
 							} else {
 								m = strcmp(c + 1, targ);
 							}
@@ -170,16 +202,15 @@ static int files_search(alpm_list_t *syncs, alpm_list_t *targets, int regex) {
 			}
 		}
 
-		if(regex) {
-			regfree(&reg);
-		}
-
-notfound:
 		if(!found) {
 			ret = 1;
 		}
 	}
 
+cleanup:
+	alpm_list_free_inner(filetargs, (alpm_list_fn_free) filetarget_free);
+	alpm_list_free(filetargs);
+
 	return ret;
 }
 
-- 
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