mirror of
https://github.com/irungentoo/toxcore.git
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103 lines
3.0 KiB
C
103 lines
3.0 KiB
C
/*
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* Miscellaneous functions and data structures for doing random things.
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*/
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/*
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* Copyright © 2016-2017 The TokTok team.
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* Copyright © 2013 Tox project.
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*
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* This file is part of Tox, the free peer to peer instant messenger.
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*
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* Tox is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Tox is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Tox. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <ctype.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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// You are responsible for freeing the return value!
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uint8_t *hex_string_to_bin(const char *hex_string)
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{
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// byte is represented by exactly 2 hex digits, so lenth of binary string
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// is half of that of the hex one. only hex string with even length
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// valid. the more proper implementation would be to check if strlen(hex_string)
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// is odd and return error code if it is. we assume strlen is even. if it's not
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// then the last byte just won't be written in 'ret'.
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size_t i, len = strlen(hex_string) / 2;
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uint8_t *ret = (uint8_t *)malloc(len);
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const char *pos = hex_string;
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for (i = 0; i < len; ++i, pos += 2) {
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sscanf(pos, "%2hhx", &ret[i]);
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}
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return ret;
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}
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/* Reimplementation of strncasecmp() function from strings.h, as strings.h is
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* POSIX and not portable. Specifically it doesn't exist on MSVC.
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*/
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int tox_strncasecmp(const char *s1, const char *s2, size_t n)
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{
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while (n--) {
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int c1 = tolower(*(s1++));
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int c2 = tolower(*(s2++));
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if (c1 == '\0' || c2 == '\0' || c1 != c2) {
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return c1 - c2;
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}
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}
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return 0;
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}
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int cmdline_parsefor_ipv46(int argc, char **argv, uint8_t *ipv6enabled)
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{
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int argvoffset = 0, argi;
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for (argi = 1; argi < argc; argi++) {
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if (!tox_strncasecmp(argv[argi], "--ipv", 5)) {
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if (argv[argi][5] && !argv[argi][6]) {
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char c = argv[argi][5];
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if (c == '4') {
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*ipv6enabled = 0;
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} else if (c == '6') {
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*ipv6enabled = 1;
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} else {
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printf("Invalid argument: %s. Try --ipv4 or --ipv6!\n", argv[argi]);
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return -1;
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}
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} else {
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printf("Invalid argument: %s. Try --ipv4 or --ipv6!\n", argv[argi]);
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return -1;
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}
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if (argvoffset != argi - 1) {
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printf("Argument must come first: %s.\n", argv[argi]);
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return -1;
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}
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argvoffset++;
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}
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}
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return argvoffset;
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}
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