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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2013-2015, 2023 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <sudo_compat.h>
#include <sudo_debug.h>
#include <sudo_util.h>
/*
* Converts a two-byte hex string to decimal.
* Returns a value 0-255 on success or -1 for invalid input.
*/
int
sudo_hexchar_v1(const char s[restrict static 2])
{
unsigned char result[2];
unsigned int i;
debug_decl(sudo_hexchar, SUDO_DEBUG_UTIL);
for (i = 0; i < 2; i++) {
switch (s[i]) {
case '0':
result[i] = 0;
break;
case '1':
result[i] = 1;
break;
case '2':
result[i] = 2;
break;
case '3':
result[i] = 3;
break;
case '4':
result[i] = 4;
break;
case '5':
result[i] = 5;
break;
case '6':
result[i] = 6;
break;
case '7':
result[i] = 7;
break;
case '8':
result[i] = 8;
break;
case '9':
result[i] = 9;
break;
case 'A':
case 'a':
result[i] = 10;
break;
case 'B':
case 'b':
result[i] = 11;
break;
case 'C':
case 'c':
result[i] = 12;
break;
case 'D':
case 'd':
result[i] = 13;
break;
case 'E':
case 'e':
result[i] = 14;
break;
case 'F':
case 'f':
result[i] = 15;
break;
default:
/* Invalid input. */
debug_return_int(-1);
}
}
debug_return_int((result[0] << 4) | result[1]);
}
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