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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
extern void handle_usage_help(FILE *out_fp, const char *prog_name);
extern int handle_command_help(int argc, char *argv[], int arg_start);
extern void handle_usage_dump(FILE *out_fp, const char *prog_name);
extern int handle_command_dump(int argc, char *argv[], int arg_start);
extern void handle_usage_create(FILE *out_fp, const char *prog_name);
extern int handle_command_create(int argc, char *argv[], int arg_start);
extern void handle_usage_cfg_create(FILE *out_fp, const char *prog_name);
extern int handle_command_cfg_create(int argc, char *argv[], int arg_start);
struct command_info {
const char *command;
void (*usage)(FILE *out_fp, const char *prog_name);
int (*handler)(int argc, char *argv[], int arg_start);
};
static const struct command_info command_infos[] = {
{ "help", handle_usage_help, handle_command_help },
{ "dump", handle_usage_dump, handle_command_dump },
{ "create", handle_usage_create, handle_command_create },
{ "cfg_create", handle_usage_cfg_create, handle_command_cfg_create },
{ NULL, NULL, NULL }
};
static const struct command_info *search_command(const char *command) {
const struct command_info *info;
for (info = command_infos; info->command != NULL; info++) {
if (strcmp(command, info->command) == 0) {
break;
}
}
if (info->command == NULL) {
fprintf(stderr, "Unknown command: %s\n", command);
return NULL;
}
return info;
}
static void print_all_commands(FILE *out_fp) {
const struct command_info *info;
for (info = command_infos; info->command != NULL; info++) {
if (info != command_infos) {
fprintf(out_fp, ", ");
}
fprintf(out_fp, "%s", info->command);
}
fprintf(out_fp, "\n");
}
static void output_all_usage(FILE *out_fp, const char *prog_name) {
fprintf(out_fp, " %s <command>\n\n", prog_name);
fprintf(out_fp, " commands:\n ");
print_all_commands(out_fp);
fprintf(out_fp, "\n");
const struct command_info *info;
for (info = command_infos; info->command != NULL; info++) {
info->usage(out_fp, prog_name);
fprintf(out_fp, "\n");
}
}
void handle_usage_help(FILE *out_fp, const char *prog_name) {
fprintf(out_fp, " %s help all\n", prog_name);
fprintf(out_fp, " %s help <command>\n\n", prog_name);
fprintf(out_fp, " commands:\n ");
print_all_commands(out_fp);
}
int handle_command_help(int argc, char *argv[], int arg_start) {
const char *prog_name = argv[0];
if (argc - arg_start < 1) {
handle_usage_help(stderr, prog_name);
return 1;
}
if (strcmp(argv[arg_start], "all") == 0) {
output_all_usage(stdout, prog_name);
return 0;
}
const struct command_info *info = search_command(argv[arg_start]);
if (info == NULL) {
handle_usage_help(stderr, prog_name);
return 1;
}
info->usage(stdout, prog_name);
return 0;
}
int main(int argc, char *argv[]) {
if (argc <= 1) {
output_all_usage(stderr, argv[0]);
return 1;
}
const char *command = argv[1];
const struct command_info *info = search_command(argv[1]);
if (info == NULL) {
return 1;
}
/* skip 2 arguments, argv[0] and argv[1] */
return info->handler(argc, argv, 2);
}
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