Update copyright year to 2017.
[paraslash.git] / afh.c
diff --git a/afh.c b/afh.c
index 3881955..36c432e 100644 (file)
--- a/afh.c
+++ b/afh.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2008-2013 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2008 Andre Noll <maan@tuebingen.mpg.de>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
 #include "version.h"
 #include "ggo.h"
 
+/** Array of error strings. */
+DEFINE_PARA_ERRLIST;
+
 static struct afh_args_info conf;
-INIT_AFH_ERRLISTS;
 
 static int loglevel;
 INIT_STDERR_LOGGING(loglevel)
 
+static inline bool tag_needs_update(bool given, const char *tag,
+               const char *arg)
+{
+       return given && (!tag || strcmp(tag, arg) != 0);
+}
+
+static int rewrite_tags(const char *name, int input_fd, void *map,
+               size_t map_size, int audio_format_id, struct afh_info *afhi)
+{
+       struct taginfo *tags = &afhi->tags;
+       bool modified = false;
+       char *tmp_name;
+       int output_fd = -1, ret;
+       struct stat sb;
+
+       if (tag_needs_update(conf.year_given, tags->year, conf.year_arg)) {
+               free(tags->year);
+               tags->year = para_strdup(conf.year_arg);
+               modified = true;
+       }
+       if (tag_needs_update(conf.title_given, tags->title, conf.title_arg)) {
+               free(tags->title);
+               tags->title = para_strdup(conf.title_arg);
+               modified = true;
+       }
+       if (tag_needs_update(conf.artist_given, tags->artist,
+                       conf.artist_arg)) {
+               free(tags->artist);
+               tags->artist = para_strdup(conf.artist_arg);
+               modified = true;
+       }
+       if (tag_needs_update(conf.album_given, tags->album, conf.album_arg)) {
+               free(tags->album);
+               tags->album = para_strdup(conf.album_arg);
+               modified = true;
+       }
+       if (tag_needs_update(conf.comment_given, tags->comment,
+                       conf.comment_arg)) {
+               free(tags->comment);
+               tags->comment = para_strdup(conf.comment_arg);
+               modified = true;
+       }
+       if (!modified) {
+               PARA_WARNING_LOG("no modifications necessary\n");
+               return 0;
+       }
+       /*
+        * mkstmp() creates the temporary file with permissions 0600, but we
+        * like it to have the same permissions as the original file, so we
+        * have to get this information.
+        */
+       if (fstat(input_fd, &sb) < 0) {
+               ret = -ERRNO_TO_PARA_ERROR(errno);
+               PARA_ERROR_LOG("failed to fstat fd %d (%s)\n", input_fd, name);
+               return ret;
+       }
+       tmp_name = make_message("%s.XXXXXX", name);
+       ret = mkstemp(tmp_name);
+       if (ret < 0) {
+               ret = -ERRNO_TO_PARA_ERROR(errno);
+               PARA_ERROR_LOG("could not create temporary file\n");
+               goto out;
+       }
+       output_fd = ret;
+       if (fchmod(output_fd, sb.st_mode) < 0) {
+               ret = -ERRNO_TO_PARA_ERROR(errno);
+               PARA_ERROR_LOG("failed to fchmod fd %d (%s)\n", output_fd,
+                       tmp_name);
+               goto out;
+       }
+       ret = afh_rewrite_tags(audio_format_id, map, map_size, tags, output_fd,
+               tmp_name);
+       if (ret < 0)
+               goto out;
+       if (conf.backup_given) {
+               char *backup_name = make_message("%s~", name);
+               ret = xrename(name, backup_name);
+               free(backup_name);
+               if (ret < 0)
+                       goto out;
+       }
+       ret = xrename(tmp_name, name);
+out:
+       if (ret < 0 && output_fd >= 0)
+               unlink(tmp_name); /* ignore errors */
+       free(tmp_name);
+       if (output_fd >= 0)
+               close(output_fd);
+       return ret;
+}
+
 static void print_info(int audio_format_num, struct afh_info *afhi)
 {
        char *msg;
@@ -78,7 +171,7 @@ __noreturn static void print_help_and_die(void)
  */
 int main(int argc, char **argv)
 {
-       int i, ret, audio_format_num, fd;
+       int i, ret = 0, audio_format_num, fd;
        void *audio_file_data;
        size_t audio_file_size;
        struct afh_info afhi;
@@ -86,13 +179,9 @@ int main(int argc, char **argv)
        afh_cmdline_parser(argc, argv, &conf);
        loglevel = get_loglevel_by_name(conf.loglevel_arg);
        version_handle_flag("afh", conf.version_given);
-       if (conf.help_given || conf.detailed_help_given)
+       if (conf.help_given || conf.detailed_help_given || conf.inputs_num == 0)
                print_help_and_die();
        afh_init();
-       ret = -E_AFH_SYNTAX;
-       if (conf.inputs_num == 0)
-               goto out;
-       afh_init();
        for (i = 0; i < conf.inputs_num; i++) {
                int ret2;
                ret = mmap_full_file(conf.inputs[i], O_RDONLY, &audio_file_data,
@@ -103,16 +192,21 @@ int main(int argc, char **argv)
                }
                ret = compute_afhi(conf.inputs[i], audio_file_data, audio_file_size,
                        fd, &afhi);
-               if (ret < 0)
-                       goto out;
-
-               audio_format_num = ret;
-               printf("File %d: %s\n", i + 1, conf.inputs[i]);
-               print_info(audio_format_num, &afhi);
-               if (conf.chunk_table_given)
-                       print_chunk_table(&afhi);
-               printf("\n");
-               clear_afhi(&afhi);
+               if (ret >= 0) {
+                       audio_format_num = ret;
+                       if (conf.modify_given) {
+                               ret = rewrite_tags(conf.inputs[i], fd, audio_file_data,
+                                       audio_file_size, audio_format_num, &afhi);
+                       } else {
+                               printf("File %d: %s\n", i + 1, conf.inputs[i]);
+                               print_info(audio_format_num, &afhi);
+                               if (conf.chunk_table_given)
+                                       print_chunk_table(&afhi);
+                               printf("\n");
+                       }
+                       clear_afhi(&afhi);
+               }
+               close(fd);
                ret2 = para_munmap(audio_file_data, audio_file_size);
                if (ret2 < 0 && ret >= 0)
                        ret = ret2;