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206 lines
8.1 KiB
206 lines
8.1 KiB
/*
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* C Reusables
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* <http://github.com/mity/c-reusables>
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*
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* Copyright (c) 2017-2020 Martin Mitas
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "cmdline.h"
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#include <stdio.h>
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#include <string.h>
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#ifdef _WIN32
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#define snprintf _snprintf
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#endif
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#define CMDLINE_AUXBUF_SIZE 32
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static int
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cmdline_handle_short_opt_group(const CMDLINE_OPTION* options, const char* arggroup,
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int (*callback)(int /*optval*/, const char* /*arg*/, void* /*userdata*/),
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void* userdata)
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{
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const CMDLINE_OPTION* opt;
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int i;
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int ret = 0;
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for(i = 0; arggroup[i] != '\0'; i++) {
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for(opt = options; opt->id != 0; opt++) {
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if(arggroup[i] == opt->shortname)
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break;
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}
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if(opt->id != 0 && !(opt->flags & CMDLINE_OPTFLAG_REQUIREDARG)) {
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ret = callback(opt->id, NULL, userdata);
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} else {
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/* Unknown option. */
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char badoptname[3];
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badoptname[0] = '-';
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badoptname[1] = arggroup[i];
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badoptname[2] = '\0';
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ret = callback((opt->id != 0 ? CMDLINE_OPTID_MISSINGARG : CMDLINE_OPTID_UNKNOWN),
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badoptname, userdata);
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}
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if(ret != 0)
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break;
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}
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return ret;
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}
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int
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cmdline_read(const CMDLINE_OPTION* options, int argc, char** argv,
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int (*callback)(int /*optval*/, const char* /*arg*/, void* /*userdata*/),
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void* userdata)
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{
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const CMDLINE_OPTION* opt;
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char auxbuf[CMDLINE_AUXBUF_SIZE+1];
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int fast_optarg_decision = 1;
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int after_doubledash = 0;
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int i = 1;
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int ret = 0;
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auxbuf[CMDLINE_AUXBUF_SIZE] = '\0';
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/* Check whether there is any CMDLINE_OPTFLAG_COMPILERLIKE option with
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* a name not starting with '-'. That would imply we can to check for
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* non-option arguments only after refusing all such options. */
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for(opt = options; opt->id != 0; opt++) {
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if((opt->flags & CMDLINE_OPTFLAG_COMPILERLIKE) && opt->longname[0] != '-')
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fast_optarg_decision = 0;
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}
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while(i < argc) {
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if(after_doubledash || strcmp(argv[i], "-") == 0) {
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/* Non-option argument.
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* Standalone "-" usually means "read from stdin" or "write to
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* stdout" so treat it always as a non-option. */
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ret = callback(CMDLINE_OPTID_NONE, argv[i], userdata);
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} else if(strcmp(argv[i], "--") == 0) {
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/* End of options. All the remaining tokens are non-options
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* even if they start with a dash. */
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after_doubledash = 1;
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} else if(fast_optarg_decision && argv[i][0] != '-') {
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/* Non-option argument. */
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ret = callback(CMDLINE_OPTID_NONE, argv[i], userdata);
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} else {
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for(opt = options; opt->id != 0; opt++) {
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if(opt->flags & CMDLINE_OPTFLAG_COMPILERLIKE) {
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size_t len = strlen(opt->longname);
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if(strncmp(argv[i], opt->longname, len) == 0) {
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/* Compiler-like option. */
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if(argv[i][len] != '\0')
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ret = callback(opt->id, argv[i] + len, userdata);
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else if(i+1 < argc)
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ret = callback(opt->id, argv[++i], userdata);
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else
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ret = callback(CMDLINE_OPTID_MISSINGARG, opt->longname, userdata);
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break;
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}
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} else if(opt->longname != NULL && strncmp(argv[i], "--", 2) == 0) {
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size_t len = strlen(opt->longname);
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if(strncmp(argv[i]+2, opt->longname, len) == 0) {
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/* Regular long option. */
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if(argv[i][2+len] == '\0') {
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/* with no argument provided. */
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if(!(opt->flags & CMDLINE_OPTFLAG_REQUIREDARG))
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ret = callback(opt->id, NULL, userdata);
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else
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ret = callback(CMDLINE_OPTID_MISSINGARG, argv[i], userdata);
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break;
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} else if(argv[i][2+len] == '=') {
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/* with an argument provided. */
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if(opt->flags & (CMDLINE_OPTFLAG_OPTIONALARG | CMDLINE_OPTFLAG_REQUIREDARG)) {
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ret = callback(opt->id, argv[i]+2+len+1, userdata);
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} else {
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snprintf(auxbuf, CMDLINE_AUXBUF_SIZE, "--%s", opt->longname);
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ret = callback(CMDLINE_OPTID_BOGUSARG, auxbuf, userdata);
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}
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break;
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} else {
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continue;
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}
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}
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} else if(opt->shortname != '\0' && argv[i][0] == '-') {
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if(argv[i][1] == opt->shortname) {
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/* Regular short option. */
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if(opt->flags & CMDLINE_OPTFLAG_REQUIREDARG) {
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if(argv[i][2] != '\0')
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ret = callback(opt->id, argv[i]+2, userdata);
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else if(i+1 < argc)
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ret = callback(opt->id, argv[++i], userdata);
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else
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ret = callback(CMDLINE_OPTID_MISSINGARG, argv[i], userdata);
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break;
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} else {
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ret = callback(opt->id, NULL, userdata);
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/* There might be more (argument-less) short options
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* grouped together. */
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if(ret == 0 && argv[i][2] != '\0')
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ret = cmdline_handle_short_opt_group(options, argv[i]+2, callback, userdata);
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break;
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}
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}
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}
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}
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if(opt->id == 0) { /* still not handled? */
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if(argv[i][0] != '-') {
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/* Non-option argument. */
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ret = callback(CMDLINE_OPTID_NONE, argv[i], userdata);
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} else {
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/* Unknown option. */
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char* badoptname = argv[i];
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if(strncmp(badoptname, "--", 2) == 0) {
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/* Strip any argument from the long option. */
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char* assignment = strchr(badoptname, '=');
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if(assignment != NULL) {
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size_t len = assignment - badoptname;
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if(len > CMDLINE_AUXBUF_SIZE)
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len = CMDLINE_AUXBUF_SIZE;
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strncpy(auxbuf, badoptname, len);
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auxbuf[len] = '\0';
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badoptname = auxbuf;
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}
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}
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ret = callback(CMDLINE_OPTID_UNKNOWN, badoptname, userdata);
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}
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}
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}
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if(ret != 0)
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return ret;
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i++;
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}
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return ret;
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}
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