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open5gs/lib/core/ogs-getopt.c

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/*
* Copyright (C) 2019-2020 by Sukchan Lee <acetcom@gmail.com>
*
* The code is stolen from optparse
* https://github.com/skeeto/optparse
*
* This is free and unencumbered software released into the public domain.
*
* Anyone is free to copy, modify, publish, use, compile, sell, or
* distribute this software, either in source code form or as a compiled
* binary, for any purpose, commercial or non-commercial, and by any
* means.
*
* In jurisdictions that recognize copyright laws, the author or authors
* of this software dedicate any and all copyright interest in the
* software to the public domain. We make this dedication for the benefit
* of the public at large and to the detriment of our heirs and
* successors. We intend this dedication to be an overt act of
* relinquishment in perpetuity of all present and future rights to this
* software under copyright law.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* For more information, please refer to <http://unlicense.org/>
*/
#include "ogs-getopt.h"
#define OGS_GETOPT_MSG_INVALID "invalid option"
#define OGS_GETOPT_MSG_MISSING "option requires an argument"
#define OGS_GETOPT_MSG_TOOMANY "option takes no arguments"
static int ogs_getopt_error(
ogs_getopt_t *options, const char *msg, const char *data)
{
unsigned p = 0;
const char *sep = " -- '";
while (*msg)
options->errmsg[p++] = *msg++;
while (*sep)
options->errmsg[p++] = *sep++;
while (p < sizeof(options->errmsg) - 2 && *data)
options->errmsg[p++] = *data++;
options->errmsg[p++] = '\'';
options->errmsg[p++] = '\0';
return '?';
}
void ogs_getopt_init(ogs_getopt_t *options, char **argv)
{
options->argv = argv;
options->permute = 1;
options->optind = 1;
options->subopt = 0;
options->optarg = 0;
options->errmsg[0] = '\0';
}
static int ogs_getopt_is_dashdash(const char *arg)
{
return arg != 0 && arg[0] == '-' && arg[1] == '-' && arg[2] == '\0';
}
static int ogs_getopt_is_shortopt(const char *arg)
{
return arg != 0 && arg[0] == '-' && arg[1] != '-' && arg[1] != '\0';
}
static int
ogs_getopt_is_longopt(const char *arg)
{
return arg != 0 && arg[0] == '-' && arg[1] == '-' && arg[2] != '\0';
}
static void ogs_getopt_permute(ogs_getopt_t *options, int index)
{
char *nonoption = options->argv[index];
int i;
for (i = index; i < options->optind - 1; i++)
options->argv[i] = options->argv[i + 1];
options->argv[options->optind - 1] = nonoption;
}
static int ogs_getopt_argtype(const char *optstring, char c)
{
int count = OGS_GETOPT_NONE;
if (c == ':')
return -1;
for (; *optstring && c != *optstring; optstring++);
if (!*optstring)
return -1;
if (optstring[1] == ':')
count += optstring[2] == ':' ? 2 : 1;
return count;
}
int ogs_getopt(ogs_getopt_t *options, const char *optstring)
{
int type;
char *next;
char *option = options->argv[options->optind];
options->errmsg[0] = '\0';
options->optopt = 0;
options->optarg = 0;
if (option == 0) {
return -1;
} else if (ogs_getopt_is_dashdash(option)) {
options->optind++; /* consume "--" */
return -1;
} else if (!ogs_getopt_is_shortopt(option)) {
if (options->permute) {
int index = options->optind++;
int r = ogs_getopt(options, optstring);
ogs_getopt_permute(options, index);
options->optind--;
return r;
} else {
return -1;
}
}
option += options->subopt + 1;
options->optopt = option[0];
type = ogs_getopt_argtype(optstring, option[0]);
next = options->argv[options->optind + 1];
switch (type) {
case -1: {
char str[2] = {0, 0};
str[0] = option[0];
options->optind++;
return ogs_getopt_error(options, OGS_GETOPT_MSG_INVALID, str);
}
case OGS_GETOPT_NONE:
if (option[1]) {
options->subopt++;
} else {
options->subopt = 0;
options->optind++;
}
return option[0];
case OGS_GETOPT_REQUIRED:
options->subopt = 0;
options->optind++;
if (option[1]) {
options->optarg = option + 1;
} else if (next != 0) {
options->optarg = next;
options->optind++;
} else {
char str[2] = {0, 0};
str[0] = option[0];
options->optarg = 0;
return ogs_getopt_error(options, OGS_GETOPT_MSG_MISSING, str);
}
return option[0];
case OGS_GETOPT_OPTIONAL:
options->subopt = 0;
options->optind++;
if (option[1])
options->optarg = option + 1;
else
options->optarg = 0;
return option[0];
}
return 0;
}
char *ogs_getopt_arg(ogs_getopt_t *options)
{
char *option = options->argv[options->optind];
options->subopt = 0;
if (option != 0)
options->optind++;
return option;
}
static int ogs_getopt_longopts_end(const ogs_getopt_long_t *longopts, int i)
{
return !longopts[i].longname && !longopts[i].shortname;
}
static void
ogs_getopt_from_long(const ogs_getopt_long_t *longopts, char *optstring)
{
char *p = optstring;
int i;
for (i = 0; !ogs_getopt_longopts_end(longopts, i); i++) {
if (longopts[i].shortname) {
int a;
*p++ = longopts[i].shortname;
for (a = 0; a < (int)longopts[i].argtype; a++)
*p++ = ':';
}
}
*p = '\0';
}
/* Unlike strcmp(), handles options containing "=". */
static int ogs_getopt_longopts_match(const char *longname, const char *option)
{
const char *a = option, *n = longname;
if (longname == 0)
return 0;
for (; *a && *n && *a != '='; a++, n++)
if (*a != *n)
return 0;
return *n == '\0' && (*a == '\0' || *a == '=');
}
/* Return the part after "=", or NULL. */
static char *ogs_getopt_longopts_arg(char *option)
{
for (; *option && *option != '='; option++);
if (*option == '=')
return option + 1;
else
return 0;
}
static int ogs_getopt_long_fallback(ogs_getopt_t *options,
const ogs_getopt_long_t *longopts,
int *longindex)
{
int result;
char optstring[96 * 3 + 1]; /* 96 ASCII printable characters */
ogs_getopt_from_long(longopts, optstring);
result = ogs_getopt(options, optstring);
if (longindex != 0) {
*longindex = -1;
if (result != -1) {
int i;
for (i = 0; !ogs_getopt_longopts_end(longopts, i); i++)
if (longopts[i].shortname == options->optopt)
*longindex = i;
}
}
return result;
}
int ogs_getopt_long(ogs_getopt_t *options,
const ogs_getopt_long_t *longopts,
int *longindex)
{
int i;
char *option = options->argv[options->optind];
if (option == 0) {
return -1;
} else if (ogs_getopt_is_dashdash(option)) {
options->optind++; /* consume "--" */
return -1;
} else if (ogs_getopt_is_shortopt(option)) {
return ogs_getopt_long_fallback(options, longopts, longindex);
} else if (!ogs_getopt_is_longopt(option)) {
if (options->permute) {
int index = options->optind++;
int r = ogs_getopt_long(options, longopts, longindex);
ogs_getopt_permute(options, index);
options->optind--;
return r;
} else {
return -1;
}
}
/* Parse as long option. */
options->errmsg[0] = '\0';
options->optopt = 0;
options->optarg = 0;
option += 2; /* skip "--" */
options->optind++;
for (i = 0; !ogs_getopt_longopts_end(longopts, i); i++) {
const char *name = longopts[i].longname;
if (ogs_getopt_longopts_match(name, option)) {
char *arg;
if (longindex)
*longindex = i;
options->optopt = longopts[i].shortname;
arg = ogs_getopt_longopts_arg(option);
if (longopts[i].argtype == OGS_GETOPT_NONE && arg != 0) {
return ogs_getopt_error(options, OGS_GETOPT_MSG_TOOMANY, name);
} if (arg != 0) {
options->optarg = arg;
} else if (longopts[i].argtype == OGS_GETOPT_REQUIRED) {
options->optarg = options->argv[options->optind];
if (options->optarg == 0)
return ogs_getopt_error(
options, OGS_GETOPT_MSG_MISSING, name);
else
options->optind++;
}
return options->optopt;
}
}
return ogs_getopt_error(options, OGS_GETOPT_MSG_INVALID, option);
}
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