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alsa-utils/alsaucm/usecase.c
Jaroslav Kysela 76b4af2616 alsaucm: add 'getval' and 'getival' commands 
Print the value only without the variable name prefix

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
2021-05-13 11:54:15 +02:00

523 lines
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/*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Support for the verb/device/modifier core logic and API,
* command line tool and file parser was kindly sponsored by
* Texas Instruments Inc.
* Support for multiple active modifiers and devices,
* transition sequences, multiple client access and user defined use
* cases was kindly sponsored by Wolfson Microelectronics PLC.
*
* Copyright (C) 2008-2010 SlimLogic Ltd
* Copyright (C) 2010 Wolfson Microelectronics PLC
* Copyright (C) 2010 Texas Instruments Inc.
* Copyright (C) 2010 Red Hat Inc.
* Authors: Liam Girdwood <lrg@slimlogic.co.uk>
* Stefan Schmidt <stefan@slimlogic.co.uk>
* Justin Xu <justinx@slimlogic.co.uk>
* Jaroslav Kysela <perex@perex.cz>
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <getopt.h>
#include <alsa/asoundlib.h>
#include <alsa/use-case.h>
#include "usecase.h"
#include "aconfig.h"
#include "version.h"
#define MAX_BUF 256
enum uc_cmd {
/* management */
OM_UNKNOWN = 0,
OM_OPEN,
OM_RESET,
OM_RELOAD,
OM_LISTCARDS,
OM_DUMP,
OM_LIST2,
OM_LIST1,
/* set/get */
OM_SET,
OM_GET,
OM_GET_VAL,
OM_GETI,
OM_GETI_VAL,
/* misc */
OM_HELP,
OM_QUIT,
};
struct cmd {
int code;
int args;
unsigned int opencard:1;
const char *id;
};
static struct cmd cmds[] = {
{ OM_OPEN, 1, 0, "open" },
{ OM_RESET, 0, 1, "reset" },
{ OM_RELOAD, 0, 1, "reload" },
{ OM_LISTCARDS, 0, 0, "listcards" },
{ OM_DUMP, 1, 1, "dump" },
{ OM_LIST1, 1, 1, "list1" },
{ OM_LIST2, 1, 1, "list" },
{ OM_SET, 2, 1, "set" },
{ OM_GET, 1, 1, "get" },
{ OM_GET_VAL, 1, 1, "getval" },
{ OM_GETI, 1, 1, "geti" },
{ OM_GETI_VAL, 1, 1, "getival" },
{ OM_DUMP, 1, 1, "dump" },
{ OM_HELP, 0, 0, "help" },
{ OM_QUIT, 0, 0, "quit" },
{ OM_HELP, 0, 0, "h" },
{ OM_HELP, 0, 0, "?" },
{ OM_QUIT, 0, 0, "q" },
{ OM_UNKNOWN, 0, 0, NULL }
};
static void dump_help(struct context *context)
{
if (context->command)
printf("Usage: %s <options> [command]\n", context->command);
printf(
"\nAvailable options:\n"
" -h,--help this help\n"
" -c,--card NAME open card NAME\n"
" -i,--interactive interactive mode\n"
" -b,--batch FILE batch mode (use '-' for the stdin input)\n"
" -n,--no-open do not open first card found\n"
"\nAvailable commands:\n"
" open NAME open card NAME\n"
" reset reset sound card to default state\n"
" reload reload configuration\n"
" listcards list available cards\n"
" dump FORMAT dump all config information (format: text,json)\n"
" list IDENTIFIER list command, for items with value + comment\n"
" list1 IDENTIFIER list command, for items without comments\n"
" get IDENTIFIER get string value\n"
" geti IDENTIFIER get integer value\n"
" set IDENTIFIER VALUE set string value\n"
" h,help help\n"
" q,quit quit\n"
);
}
static int parse_line(struct context *context, char *line)
{
char *start, **nargv;
int c;
context->argc = 0;
while (*line) {
while (*line && (*line == ' ' || *line == '\t' ||
*line == '\n'))
line++;
c = *line;
if (c == '\0')
return 0;
if (c == '\"' || c == '\'') {
start = ++line;
while (*line && *line != c)
line++;
if (*line) {
*line = '\0';
line++;
}
} else {
start = line;
while (*line && *line != ' ' && *line != '\t' &&
*line != '\n')
line++;
if (*line) {
*line = '\0';
line++;
}
}
if (start[0] == '\0' && context->argc == 0)
return 0;
if (context->argc + 1 >= context->arga) {
context->arga += 4;
nargv = realloc(context->argv,
context->arga * sizeof(char *));
if (nargv == NULL)
return -ENOMEM;
context->argv = nargv;
}
context->argv[context->argc++] = start;
}
return 0;
}
static void my_exit(struct context *context, int exitcode)
{
if (context->uc_mgr)
snd_use_case_mgr_close(context->uc_mgr);
if (context->arga > 0)
free(context->argv);
if (context->card)
free(context->card);
if (context->batch)
free(context->batch);
free(context);
snd_config_update_free_global();
exit(exitcode);
}
static void do_initial_open(struct context *context)
{
int card, err;
char name[16];
if (!context->no_open && context->card == NULL) {
card = -1;
err = snd_card_next(&card);
if (err < 0) {
fprintf(stderr, "%s: no sound card found: %s\n",
context->command, snd_strerror(err));
my_exit(context, EXIT_FAILURE);
}
snprintf(name, sizeof(name), "hw:%d", card);
context->card = strdup(name);
}
/* open library */
if (!context->no_open) {
err = snd_use_case_mgr_open(&context->uc_mgr,
context->card);
if (err < 0) {
fprintf(stderr,
"%s: error failed to open sound card %s: %s\n",
context->command, context->card, snd_strerror(err));
my_exit(context, EXIT_FAILURE);
}
}
}
static int do_one(struct context *context, struct cmd *cmd, char **argv)
{
const char **list, *str;
long lval;
int err, i, j, entries;
if (cmd->opencard && context->uc_mgr == NULL) {
if (!context->no_open) {
do_initial_open(context);
context->no_open = 1;
} else {
fprintf(stderr, "%s: command '%s' requires an open card\n",
context->command, cmd->id);
return 0;
}
}
switch (cmd->code) {
case OM_OPEN:
if (context->uc_mgr)
snd_use_case_mgr_close(context->uc_mgr);
context->uc_mgr = NULL;
free(context->card);
context->card = strdup(argv[0]);
err = snd_use_case_mgr_open(&context->uc_mgr, context->card);
if (err < 0) {
fprintf(stderr,
"%s: error failed to open sound card %s: %s\n",
context->command, context->card,
snd_strerror(err));
return err;
}
break;
case OM_RESET:
err = snd_use_case_mgr_reset(context->uc_mgr);
if (err < 0) {
fprintf(stderr,
"%s: error failed to reset sound card %s: %s\n",
context->command, context->card,
snd_strerror(err));
return err;
}
break;
case OM_RELOAD:
err = snd_use_case_mgr_reload(context->uc_mgr);
if (err < 0) {
fprintf(stderr,
"%s: error failed to reload manager %s: %s\n",
context->command, context->card,
snd_strerror(err));
return err;
}
break;
case OM_LISTCARDS:
err = snd_use_case_card_list(&list);
if (err < 0) {
fprintf(stderr,
"%s: error failed to get card list: %s\n",
context->command,
snd_strerror(err));
return err;
}
if (err == 0) {
printf(" list is empty\n");
return 0;
}
for (i = 0; i < err / 2; i++) {
printf(" %i: %s\n", i, list[i*2]);
if (list[i*2+1])
printf(" %s\n", list[i*2+1]);
}
snd_use_case_free_list(list, err);
break;
case OM_DUMP:
dump(context, argv[0]);
break;
case OM_LIST1:
case OM_LIST2:
switch (cmd->code) {
case OM_LIST1:
entries = 1;
break;
case OM_LIST2:
entries = 2;
break;
}
err = snd_use_case_get_list(context->uc_mgr,
argv[0],
&list);
if (err < 0) {
fprintf(stderr,
"%s: error failed to get list %s: %s\n",
context->command, argv[0],
snd_strerror(err));
return err;
}
if (err == 0) {
printf(" list is empty\n");
return 0;
}
for (i = 0; i < err / entries; i++) {
printf(" %i: %s\n", i, list[i*entries]);
for (j = 0; j < entries - 1; j++)
if (list[i*entries+j+1])
printf(" %s\n", list[i*entries+j+1]);
}
snd_use_case_free_list(list, err);
break;
case OM_SET:
err = snd_use_case_set(context->uc_mgr, argv[0], argv[1]);
if (err < 0) {
fprintf(stderr,
"%s: error failed to set %s=%s: %s\n",
context->command, argv[0], argv[1],
snd_strerror(err));
return err;
}
break;
case OM_GET:
case OM_GET_VAL:
err = snd_use_case_get(context->uc_mgr, argv[0], &str);
if (err < 0) {
fprintf(stderr,
"%s: error failed to get %s: %s\n",
context->command, argv[0],
snd_strerror(err));
return err;
}
if (cmd->code == OM_GET)
printf(" %s=%s\n", argv[0], str);
else
printf("%s\n", str);
free((void *)str);
break;
case OM_GETI:
case OM_GETI_VAL:
err = snd_use_case_geti(context->uc_mgr, argv[0], &lval);
if (err < 0) {
fprintf(stderr,
"%s: error failed to get integer %s: %s\n",
context->command, argv[0],
snd_strerror(err));
return lval;
}
if (cmd->code == OM_GETI)
printf(" %s=%li\n", argv[0], lval);
else
printf("%li\n", lval);
break;
case OM_QUIT:
context->do_exit = 1;
break;
case OM_HELP:
dump_help(context);
break;
default:
fprintf(stderr, "%s: unimplemented command '%s'\n",
context->command, cmd->id);
return -EINVAL;
}
return 0;
}
static int do_commands(struct context *context)
{
char *command, **argv;
struct cmd *cmd;
int i, acnt, err;
for (i = 0; i < context->argc && !context->do_exit; i++) {
command = context->argv[i];
for (cmd = cmds; cmd->id != NULL; cmd++) {
if (strcmp(cmd->id, command) == 0)
break;
}
if (cmd->id == NULL) {
fprintf(stderr, "%s: unknown command '%s'\n",
context->command, command);
return -EINVAL;
}
acnt = context->argc - (i + 1);
if (acnt < cmd->args) {
fprintf(stderr, "%s: expected %i arguments (got %i)\n",
context->command, cmd->args, acnt);
return -EINVAL;
}
argv = context->argv + i + 1;
err = do_one(context, cmd, argv);
if (err < 0)
return err;
i += cmd->args;
}
return 0;
}
enum {
OPT_VERSION = 1,
};
int main(int argc, char *argv[])
{
static const char short_options[] = "hb:c:in";
static const struct option long_options[] = {
{"help", 0, 0, 'h'},
{"version", 0, 0, OPT_VERSION},
{"card", 1, 0, 'c'},
{"interactive", 0, 0, 'i'},
{"batch", 1, 0, 'b'},
{"no-open", 0, 0, 'n'},
{0, 0, 0, 0}
};
struct context *context;
const char *command = argv[0];
int c, err, option_index;
char cmd[MAX_BUF];
FILE *in;
context = calloc(1, sizeof(*context));
if (context == NULL)
return EXIT_FAILURE;
context->command = command;
while ((c = getopt_long(argc, argv, short_options,
long_options, &option_index)) != -1) {
switch (c) {
case 'h':
dump_help(context);
break;
case OPT_VERSION:
printf("%s: version " SND_UTIL_VERSION_STR "\n", command);
break;
case 'c':
if (context->card)
free(context->card);
context->card = strdup(optarg);
break;
case 'i':
context->interactive = 1;
context->batch = NULL;
break;
case 'b':
context->batch = strdup(optarg);
context->interactive = 0;
break;
case 'n':
context->no_open = 1;
break;
default:
fprintf(stderr, "Try '%s --help' for more information.\n", command);
my_exit(context, EXIT_FAILURE);
}
}
/* parse and execute any command line commands */
if (argc > optind) {
context->argv = argv + optind;
context->argc = argc - optind;
err = do_commands(context);
if (err < 0)
my_exit(context, EXIT_FAILURE);
}
if (!context->interactive && !context->batch)
my_exit(context, EXIT_SUCCESS);
if (context->interactive) {
printf("%s: Interacive mode - 'q' to quit\n", command);
in = stdin;
} else {
if (strcmp(context->batch, "-") == 0) {
in = stdin;
} else {
in = fopen(context->batch, "r");
if (in == NULL) {
fprintf(stderr, "%s: error failed to open file '%s': %s\n",
command, context->batch, strerror(-errno));
my_exit(context, EXIT_FAILURE);
}
}
}
/* run the interactive command parser and handler */
while (!context->do_exit && !feof(in)) {
if (context->interactive)
printf("%s>> ", argv[0]);
fflush(stdin);
if (fgets(cmd, MAX_BUF, in) == NULL)
break;
err = parse_line(context, cmd);
if (err < 0) {
fprintf(stderr, "%s: unable to parse line\n",
command);
my_exit(context, EXIT_FAILURE);
}
err = do_commands(context);
if (err < 0) {
if (context->interactive)
printf("^^^ error, try again\n");
else
my_exit(context, EXIT_FAILURE);
}
}
if (in != stdin)
fclose(in);
my_exit(context, EXIT_SUCCESS);
return EXIT_SUCCESS;
}
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