alsa-utils/axfer/main.c

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// SPDX-License-Identifier: GPL-2.0
// main.c - an entry point for this program.
//
// Copyright (c) 2018 Takashi Sakamoto <o-takashi@sakamocchi.jp>
//
// Originally written as 'aplay', by Michael Beck and Jaroslav Kysela.
//
// Licensed under the terms of the GNU General Public License, version 2.
#include "subcmd.h"
#include "misc.h"
#include "version.h"
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
enum subcmds {
SUBCMD_TRANSFER = 0,
SUBCMD_LIST,
SUBCMD_HELP,
SUBCMD_VERSION,
};
static void print_version(const char *const cmdname)
{
printf("%s: version %s\n", cmdname, SND_UTIL_VERSION_STR);
}
static void print_help(void)
{
printf("help\n");
}
static void decide_subcmd(int argc, char *const *argv, enum subcmds *subcmd)
{
static const char *const subcmds[] = {
[SUBCMD_TRANSFER] = "transfer",
[SUBCMD_LIST] = "list",
[SUBCMD_HELP] = "help",
[SUBCMD_VERSION] = "version",
};
static const struct {
const char *const name;
enum subcmds subcmd;
} long_opts[] = {
{"--list-devices", SUBCMD_LIST},
{"--list-pcms", SUBCMD_LIST},
{"--help", SUBCMD_HELP},
{"--version", SUBCMD_VERSION},
};
static const struct {
unsigned char c;
enum subcmds subcmd;
} short_opts[] = {
{'l', SUBCMD_LIST},
{'L', SUBCMD_LIST},
{'h', SUBCMD_HELP},
};
char *pos;
int i, j;
if (argc == 1) {
*subcmd = SUBCMD_HELP;
return;
}
// sub-command system.
for (i = 0; i < ARRAY_SIZE(subcmds); ++i) {
if (!strcmp(argv[1], subcmds[i])) {
*subcmd = i;
return;
}
}
// Original command system. For long options.
for (i = 0; i < ARRAY_SIZE(long_opts); ++i) {
for (j = 0; j < argc; ++j) {
if (!strcmp(long_opts[i].name, argv[j])) {
*subcmd = long_opts[i].subcmd;
return;
}
}
}
// Original command system. For short options.
for (i = 1; i < argc; ++i) {
// Pick up short options only.
if (argv[i][0] != '-' || argv[i][0] == '\0' ||
argv[i][1] == '-' || argv[i][1] == '\0')
continue;
for (pos = argv[i]; *pos != '\0'; ++pos) {
for (j = 0; j < ARRAY_SIZE(short_opts); ++j) {
if (*pos == short_opts[j].c) {
*subcmd = short_opts[j].subcmd;
return;
}
}
}
}
*subcmd = SUBCMD_TRANSFER;
}
static bool decide_direction(int argc, char *const *argv,
snd_pcm_stream_t *direction)
{
static const struct {
const char *const name;
snd_pcm_stream_t direction;
} long_opts[] = {
{"--capture", SND_PCM_STREAM_CAPTURE},
{"--playback", SND_PCM_STREAM_PLAYBACK},
};
static const struct {
unsigned char c;
snd_pcm_stream_t direction;
} short_opts[] = {
{'C', SND_PCM_STREAM_CAPTURE},
{'P', SND_PCM_STREAM_PLAYBACK},
};
static const char *const aliases[] = {
[SND_PCM_STREAM_CAPTURE] = "arecord",
[SND_PCM_STREAM_PLAYBACK] = "aplay",
};
int i, j;
char *pos;
// Original command system. For long options.
for (i = 0; i < ARRAY_SIZE(long_opts); ++i) {
for (j = 0; j < argc; ++j) {
if (!strcmp(long_opts[i].name, argv[j])) {
*direction = long_opts[i].direction;
return true;
}
}
}
// Original command system. For short options.
for (i = 1; i < argc; ++i) {
// Pick up short options only.
if (argv[i][0] != '-' || argv[i][0] == '\0' ||
argv[i][1] == '-' || argv[i][1] == '\0')
continue;
for (pos = argv[i]; *pos != '\0'; ++pos) {
for (j = 0; j < ARRAY_SIZE(short_opts); ++j) {
if (*pos == short_opts[j].c) {
*direction = short_opts[j].direction;
return true;
}
}
}
}
// If not decided yet, judge according to command name.
for (i = 0; i < ARRAY_SIZE(aliases); ++i) {
for (pos = argv[0] + strlen(argv[0]); pos != argv[0]; --pos) {
if (strstr(pos, aliases[i]) != NULL) {
*direction = i;
return true;
}
}
}
return false;
}
int main(int argc, char *const *argv)
{
snd_pcm_stream_t direction;
enum subcmds subcmd;
int err = 0;
if (!decide_direction(argc, argv, &direction))
subcmd = SUBCMD_HELP;
else
decide_subcmd(argc, argv, &subcmd);
if (subcmd == SUBCMD_TRANSFER)
printf("execute 'transfer' subcmd.\n");
else if (subcmd == SUBCMD_LIST)
err = subcmd_list(argc, argv, direction);
else if (subcmd == SUBCMD_VERSION)
print_version(argv[0]);
else
print_help();
if (err < 0)
return EXIT_FAILURE;
return EXIT_SUCCESS;
}