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/* misc_tools.c
*
* Miscellaneous functions and data structures for doing random things.
*
* Copyright (C) 2013 Tox project All Rights Reserved.
*
* This file is part of Tox.
*
* Tox is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Tox is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Tox. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef TOX_DEBUG
#include <assert.h>
#endif // TOX_DEBUG
// You are responsible for freeing the return value!
uint8_t *hex_string_to_bin(const char *hex_string)
{
// byte is represented by exactly 2 hex digits, so lenth of binary string
// is half of that of the hex one. only hex string with even length
// valid. the more proper implementation would be to check if strlen(hex_string)
// is odd and return error code if it is. we assume strlen is even. if it's not
// then the last byte just won't be written in 'ret'.
size_t i, len = strlen(hex_string) / 2;
uint8_t *ret = (uint8_t *)malloc(len);
const char *pos = hex_string;
for (i = 0; i < len; ++i, pos += 2) {
sscanf(pos, "%2hhx", &ret[i]);
}
return ret;
}
int cmdline_parsefor_ipv46(int argc, char **argv, uint8_t *ipv6enabled)
{
int argvoffset = 0, argi;
for (argi = 1; argi < argc; argi++) {
if (!strncasecmp(argv[argi], "--ipv", 5)) {
if (argv[argi][5] && !argv[argi][6]) {
char c = argv[argi][5];
if (c == '4') {
*ipv6enabled = 0;
} else if (c == '6') {
*ipv6enabled = 1;
} else {
printf("Invalid argument: %s. Try --ipv4 or --ipv6!\n", argv[argi]);
return -1;
}
} else {
printf("Invalid argument: %s. Try --ipv4 or --ipv6!\n", argv[argi]);
return -1;
}
if (argvoffset != argi - 1) {
printf("Argument must come first: %s.\n", argv[argi]);
return -1;
}
argvoffset++;
}
}
return argvoffset;
}
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