122 lines
4.1 KiB
C++
122 lines
4.1 KiB
C++
/*
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* Copyright 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "argp.h"
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#include <getopt.h>
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#include <stdio.h>
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#include <sysexits.h>
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#include <algorithm>
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#include <sstream>
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#include <string>
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#include <vector>
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extern "C" error_t argp_parse(const struct argp *argp, int argc, char **argv, int /*unused*/,
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void * /* unused */, void *input) {
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int longindex;
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std::string optstring;
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std::vector<struct option> optvec;
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// process argp_option array for use with getopt_long
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for (const struct argp_option *opt = argp->options; opt->name || opt->docstring; ++opt) {
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if (opt->key && isprint(opt->key)) {
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optstring += opt->key;
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if (opt->argname) optstring += ':';
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}
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if (opt->name) {
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optvec.push_back({ .name = opt->name, .has_arg = opt->argname ? 1 : 0,
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.flag = opt->key ? nullptr : &longindex, .val = opt->key });
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}
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}
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int longhelp = 0;
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optvec.push_back({ .name = "help", .has_arg = 0, .flag = &longhelp, .val = 1 });
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optvec.push_back({});
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int opt;
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while ((opt = getopt_long(argc, argv, optstring.c_str(), optvec.data(), &longindex)) != -1) {
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struct argp_state state = { .input = input, .argp = argp };
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if (!opt) {
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if (longhelp) argp_state_help(&state, stdout, ARGP_HELP_STD_HELP);
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return EINVAL;
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}
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error_t ret = argp->parser(opt, optarg, &state);
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if (ret) return ret;
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}
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// Handle positional arguments
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if (optind < argc) {
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for (int idx = optind; idx < argc; idx++) {
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struct argp_state state = { .input = input, .argp = argp, .arg_num = idx - optind };
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const error_t ret = argp->parser(ARGP_KEY_ARG, argv[idx], &state);
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if (ret) return ret;
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}
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}
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struct argp_state state = {.input = input, .argp = argp};
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const error_t ret = argp->parser(ARGP_KEY_END, 0, &state);
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// Not all tools expect ARGP_KEY_END, so ARGP_ERR_UNKNOWN here is benign
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if (ret && ret != ARGP_ERR_UNKNOWN) return ret;
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return 0;
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}
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extern "C" void argp_usage(struct argp_state* state) {
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fprintf(stderr, "%s", state->argp->doc);
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exit(EX_USAGE);
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}
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extern "C" void argp_state_help(struct argp_state* state, FILE *fd, int /* unused */) {
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constexpr size_t kFlagOffset = 2, kNameOffset = 6, kDocstringOffset = 29;
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fprintf(fd, "%s\n", state->argp->doc);
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for (const struct argp_option *opt = state->argp->options; opt->name || opt->docstring; ++opt) {
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// Skip hidden arguments and empty entries in the argp_option array
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if (opt->n == OPTION_HIDDEN || (opt->docstring && opt->docstring[0] == '\0')) continue;
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std::string s(kFlagOffset, ' ');
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// Append short argument form (e.g. "-p,") if applicable, then whitespace
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if (opt->key && isprint(opt->key)) {
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s.append("-");
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s.append(1, (char)opt->key);
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s.append(",");
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}
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s.append(kNameOffset - s.length(), ' ');
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// Append long argument form (e.g. "--pid=PID") or whitespace
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if (opt->name) {
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s.append("--");
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s.append(opt->name);
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if (opt->argname) {
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s.append("=");
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s.append(opt->argname);
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}
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}
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if (s.length() < kDocstringOffset) {
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s.append(kDocstringOffset - s.length(), ' ');
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} else {
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s.append(" ");
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}
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// Append docstring
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s.append(opt->docstring);
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s.append("\n");
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fprintf(fd, "%s", s.c_str());
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}
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exit(EX_OK);
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}
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