[alsa-devel] [LAD] announcing envy24control, mudita (*) edition.

[Niels Mayer]

Actually, there's a much simpler version of this patch, since the
previous code provided some extra validation and pretty error
messages, but no information that couldn't be provided by
snd_ctl_open(), e.g.:
....
gnulem-336-~> envy24control -Dfoo
ALSA lib control.c:902:(snd_ctl_open_noupdate) Invalid CTL foo
snd_ctl_open: No such file or directory
....

diff --git a/envy24control/envy24control.c b/envy24control/envy24control.c
index 0b2749e..3798ba3 100644
--- a/envy24control/envy24control.c
+++ b/envy24control/envy24control.c
@@ -2084,24 +2166,50 @@ int main(int argc, char **argv)
 	view_spdif_playback = 0;
 	profiles_file_name = DEFAULT_PROFILERC;
 	default_profile = NULL;
	while ((c = getopt_long(argc, argv, "D:c:f:i:m:Mo:p:s:w:vt:",
long_options, NULL)) != -1) {
 		switch (c) {
 		case 'D':
-			name = optarg;
-			card_number = atoi(strchr(name, ':') + sizeof(char));
-			if (card_number < 0 || card_number >= MAX_CARD_NUMBERS) {
-				fprintf(stderr, "envy24control: invalid card number %d\n", card_number);
-				exit(1);
-			}
+		/*
+		 * NPM: use ALSA code to fix/validate
+		 * https://bugzilla.redhat.com/show_bug.cgi?id=602900
+		 * The old code assumed ':' present, e.g. "-Dhw:66", (w/
+		 * .asoundrc "ctl.66 {type hw, card M66}") and would
+		 * coredump if given "-D66". Here, by not worrying about
+		 * "hw:" and passing "optarg" as-is via 'name' to
+		 * snd_ctl_open() below, resolves the issue, giving similar
+		 * behavior as 'amixer'.  However, letting snd_ctl_open()
+		 * validate gives less helpful error messages on
+		 * failure: "envy24control -Dhw:foo"
+		 *           ==> "snd_ctl_open: No such device"
+		 * So validate the arg as ALSA CTL, providing
+		 * a more specific error message and fail first if not valid.
+		 */
+			name = optarg; /* NPM: e.g. pass "-D66" unaltered to
snd_ctl_open() and let it validate valid ALSA CTL name */
+			if (index(optarg, ':')) { /* NPM: handle e.g. optarg == "hw:M66" */
+			    card_number = snd_card_get_index(strchr(optarg, ':') + sizeof(char));
+			    if (card_number < 0) {
+			      fprintf(stderr, "envy24control: invalid ALSA audio device,
invalid index or name for card: %s\n", optarg);
+			      exit(1);
+			    }
+			  }
 			break;
 		case 'c':
-			i = atoi(optarg);
-			if (i < 0 || i >= MAX_CARD_NUMBERS) {
-				fprintf(stderr, "envy24control: invalid card number %d\n", i);
+	        /*
+		  NPM: use snd_card_get_index() to fix/validate
+		  https://bugzilla.redhat.com/show_bug.cgi?id=602900
+		 * NPM: nb :"The accepted format is
+		 * an integer value in ASCII representation or the card
+		 * identifier (the id parameter for sound-card
+		 * drivers). The control device name like
+		 * /dev/snd/controlC0 is accepted, too."
+		 */
+			card_number = snd_card_get_index(optarg);
+			if (card_number < 0) {		/* NPM: code orig from alsa-utils/alsamixer/cli.c */
+				fprintf(stderr, "envy24control: invalid ALSA index or name for
audio card: %s\n", optarg);
 				exit(1);
 			}
-			card_number = i;
-			sprintf(tmpname, "hw:%d", i);
+			sprintf(tmpname, "hw:%d", card_number); /* e.g. "hw:M66" for arg
"-cM66" passed to snd_ctl_open() below */
 			name = tmpname;
 			break;
 		case 'f':

...................................

Niels
http://nielsmayer.com
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