315 lines
8.1 KiB
C
315 lines
8.1 KiB
C
/*
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* @File: optparse.c
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* @Author: liu2guang
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* @Date: 2018-06-20 14:52:10
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*
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* @LICENSE: MIT
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* https://github.com/liu2guang/optparse/blob/master/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2018-06-20 liu2guang Adapter RT-Thread.
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*/
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#include "optparse.h"
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#define OPTPARSE_MSG_INVALID "invalid option"
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#define OPTPARSE_MSG_MISSING "option requires an argument"
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#define OPTPARSE_MSG_TOOMANY "option takes no arguments"
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int optparse_error(struct optparse *options, const char *msg, const char *data)
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{
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unsigned p = 0;
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const char *sep = " -- '";
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while (*msg)
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options->errmsg[p++] = *msg++;
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while (*sep)
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options->errmsg[p++] = *sep++;
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while (p < sizeof(options->errmsg) - 2 && *data)
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options->errmsg[p++] = *data++;
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options->errmsg[p++] = '\'';
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options->errmsg[p++] = '\0';
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return '?';
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}
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static int optparse_is_dashdash(const char *arg)
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{
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return arg != 0 && arg[0] == '-' && arg[1] == '-' && arg[2] == '\0';
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}
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static int optparse_is_shortopt(const char *arg)
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{
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return arg != 0 && arg[0] == '-' && arg[1] != '-' && arg[1] != '\0';
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}
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static int optparse_is_longopt(const char *arg)
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{
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return arg != 0 && arg[0] == '-' && arg[1] == '-' && arg[2] != '\0';
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}
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static void optparse_permute(struct optparse *options, int index)
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{
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char *nonoption = options->argv[index];
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int i;
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for (i = index; i < options->optind - 1; i++)
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options->argv[i] = options->argv[i + 1];
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options->argv[options->optind - 1] = nonoption;
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}
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static int optparse_argtype(const char *optstring, char c)
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{
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int count = OPTPARSE_NONE;
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if (c == ':')
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return -1;
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for (; *optstring && c != *optstring; optstring++);
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if (!*optstring)
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return -1;
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if (optstring[1] == ':')
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count += optstring[2] == ':' ? 2 : 1;
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return count;
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}
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static int optparse_longopts_end(const struct optparse_long *longopts, int i)
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{
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return !longopts[i].longname && !longopts[i].shortname;
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}
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static void optparse_from_long(const struct optparse_long *longopts, char *optstring)
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{
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char *p = optstring;
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int i;
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for (i = 0; !optparse_longopts_end(longopts, i); i++)
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{
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if (longopts[i].shortname)
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{
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int a;
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*p++ = longopts[i].shortname;
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for (a = 0; a < (int)longopts[i].argtype; a++)
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*p++ = ':';
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}
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}
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*p = '\0';
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}
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/* Unlike strcmp(), handles options containing "=". */
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static int optparse_longopts_match(const char *longname, const char *option)
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{
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const char *a = option, *n = longname;
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if (longname == 0)
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return 0;
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for (; *a && *n && *a != '='; a++, n++)
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if (*a != *n)
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return 0;
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return *n == '\0' && (*a == '\0' || *a == '=');
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}
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/* Return the part after "=", or NULL. */
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static char *optparse_longopts_arg(char *option)
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{
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for (; *option && *option != '='; option++);
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if (*option == '=')
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return option + 1;
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else
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return 0;
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}
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static int optparse_long_fallback(struct optparse *options,
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const struct optparse_long *longopts,
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int *longindex)
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{
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int result;
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char optstring[96 * 3 + 1]; /* 96 ASCII printable characters */
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optparse_from_long(longopts, optstring);
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result = optparse(options, optstring);
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if (longindex != 0)
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{
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*longindex = -1;
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if (result != -1)
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{
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int i;
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for (i = 0; !optparse_longopts_end(longopts, i); i++)
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if (longopts[i].shortname == options->optopt)
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*longindex = i;
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}
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}
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return result;
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}
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void optparse_init(struct optparse *options, char **argv)
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{
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options->argv = argv;
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options->permute = 1;
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options->optind = 1;
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options->subopt = 0;
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options->optarg = 0;
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options->errmsg[0] = '\0';
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}
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int optparse(struct optparse *options, const char *optstring)
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{
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int type;
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char *next;
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char *option = options->argv[options->optind];
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options->errmsg[0] = '\0';
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options->optopt = 0;
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options->optarg = 0;
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if (option == 0)
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{
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return -1;
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}
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else if (optparse_is_dashdash(option))
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{
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options->optind++; /* consume "--" */
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return -1;
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}
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else if (!optparse_is_shortopt(option))
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{
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if (options->permute)
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{
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int index = options->optind++;
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int r = optparse(options, optstring);
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optparse_permute(options, index);
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options->optind--;
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return r;
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}
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else
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{
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return -1;
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}
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}
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option += options->subopt + 1;
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options->optopt = option[0];
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type = optparse_argtype(optstring, option[0]);
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next = options->argv[options->optind + 1];
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switch (type)
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{
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case -1:
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{
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char str[2] = {0, 0};
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str[0] = option[0];
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options->optind++;
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return optparse_error(options, OPTPARSE_MSG_INVALID, str);
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}
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case OPTPARSE_NONE:
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if (option[1])
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{
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options->subopt++;
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}
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else
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{
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options->subopt = 0;
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options->optind++;
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}
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return option[0];
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case OPTPARSE_REQUIRED:
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options->subopt = 0;
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options->optind++;
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if (option[1])
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{
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options->optarg = option + 1;
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}
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else if (next != 0)
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{
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options->optarg = next;
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options->optind++;
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}
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else
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{
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char str[2] = {0, 0};
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str[0] = option[0];
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options->optarg = 0;
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return optparse_error(options, OPTPARSE_MSG_MISSING, str);
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}
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return option[0];
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case OPTPARSE_OPTIONAL:
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options->subopt = 0;
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options->optind++;
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if (option[1])
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options->optarg = option + 1;
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else
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options->optarg = 0;
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return option[0];
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}
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return 0;
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}
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int optparse_long(struct optparse *options, const struct optparse_long *longopts, int *longindex)
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{
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int i;
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char *option = options->argv[options->optind];
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if (option == 0)
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{
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return -1;
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}
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else if (optparse_is_dashdash(option))
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{
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options->optind++; /* consume "--" */
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return -1;
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}
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else if (optparse_is_shortopt(option))
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{
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return optparse_long_fallback(options, longopts, longindex);
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}
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else if (!optparse_is_longopt(option))
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{
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if (options->permute)
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{
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int index = options->optind++;
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int r = optparse_long(options, longopts, longindex);
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optparse_permute(options, index);
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options->optind--;
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return r;
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}
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else
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{
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return -1;
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}
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}
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/* Parse as long option. */
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options->errmsg[0] = '\0';
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options->optopt = 0;
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options->optarg = 0;
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option += 2; /* skip "--" */
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options->optind++;
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for (i = 0; !optparse_longopts_end(longopts, i); i++)
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{
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const char *name = longopts[i].longname;
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if (optparse_longopts_match(name, option))
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{
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char *arg;
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if (longindex)
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*longindex = i;
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options->optopt = longopts[i].shortname;
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arg = optparse_longopts_arg(option);
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if (longopts[i].argtype == OPTPARSE_NONE && arg != 0)
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{
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return optparse_error(options, OPTPARSE_MSG_TOOMANY, name);
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}
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if (arg != 0)
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{
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options->optarg = arg;
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}
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else if (longopts[i].argtype == OPTPARSE_REQUIRED)
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{
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options->optarg = options->argv[options->optind];
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if (options->optarg == 0)
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return optparse_error(options, OPTPARSE_MSG_MISSING, name);
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else
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options->optind++;
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}
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return options->optopt;
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}
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}
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return optparse_error(options, OPTPARSE_MSG_INVALID, option);
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}
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char *optparse_arg(struct optparse *options)
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{
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char *option = options->argv[options->optind];
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options->subopt = 0;
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if (option != 0)
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options->optind++;
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return option;
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}
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