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amixer: support infinite line length for --stdin option and add --file option #321

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amixer: support infinite line length for --stdin option and add --file option #321

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6359cd7
amixer: support infinite line length for --stdin option
Jan 28, 2026
dcb8131
amixer: support --file option
Jan 28, 2026
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40 changes: 33 additions & 7 deletions amixer/amixer.c
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Original file line number Diff line number Diff line change
Expand Up @@ -71,6 +71,7 @@ static int help(void)
printf(" -i,--inactive show also inactive controls\n");
printf(" -a,--abstract L select abstraction level (none or basic)\n");
printf(" -s,--stdin Read and execute commands from stdin sequentially\n");
printf(" -f,--file FILE Read and execute commands from file sequentially\n");
printf(" -R,--raw-volume Use the raw value (default)\n");
printf(" -M,--mapped-volume Use the mapped volume\n");
printf("\nAvailable commands:\n");
Expand Down Expand Up @@ -1757,34 +1758,39 @@ static int split_line(char *buf, char **token, int max_token)

#define MAX_ARGS 32

static int exec_stdin(void)
static int exec_file(FILE *file)
{
int narg;
char buf[256], *args[MAX_ARGS];
char *buf = NULL, *args[MAX_ARGS];
size_t size = 0;
int err = 0;

/* quiet = 1; */
ignore_error = 1;

while (fgets(buf, sizeof(buf), stdin)) {
while (getline(&buf, &size, file) > 0) {
narg = split_line(buf, args, MAX_ARGS);
if (narg > 0) {
if (!strcmp(args[0], "sset") || !strcmp(args[0], "set"))
err = sset(narg - 1, args + 1, 0, 1);
else if (!strcmp(args[0], "cset"))
err = cset(narg - 1, args + 1, 0, 1);
if (err < 0)
return 1;
break;
}
}
return 0;

free(buf);
return err < 0 ? 1 : 0;
}


int main(int argc, char *argv[])
{
int badopt, retval, level = 0;
int read_stdin = 0;
int read_file = 0;
char filename[256] = { 0 };
static const struct option long_option[] =
{
{"help", 0, NULL, 'h'},
Expand All @@ -1797,6 +1803,7 @@ int main(int argc, char *argv[])
{"version", 0, NULL, 'v'},
{"abstract", 1, NULL, 'a'},
{"stdin", 0, NULL, 's'},
{"file", 1, NULL, 'f'},
{"raw-volume", 0, NULL, 'R'},
{"mapped-volume", 0, NULL, 'M'},
{NULL, 0, NULL, 0},
Expand All @@ -1806,7 +1813,7 @@ int main(int argc, char *argv[])
while (1) {
int c;

if ((c = getopt_long(argc, argv, "hc:D:qidnva:sRM", long_option, NULL)) < 0)
if ((c = getopt_long(argc, argv, "hc:D:qidnva:sf:RM", long_option, NULL)) < 0)
break;
switch (c) {
case 'h':
Expand Down Expand Up @@ -1863,6 +1870,11 @@ int main(int argc, char *argv[])
case 's':
read_stdin = 1;
break;
case 'f':
read_file = 1;
strncpy(filename, optarg, sizeof(filename)-1);
filename[sizeof(filename)-1] = '\0';
break;
case 'R':
std_vol_type = VOL_RAW;
break;
Expand All @@ -1880,7 +1892,21 @@ int main(int argc, char *argv[])
smixer_options.device = card;

if (read_stdin) {
retval = exec_stdin();
retval = exec_file(stdin);
goto finish;
}

if (read_file) {
FILE *file;
file = fopen(filename, "r");
if (!file) {
retval = errno;
perror("fopen");
goto finish;
}

retval = exec_file(file);
fclose(file);
goto finish;
}

Expand Down