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