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sudo-project
GitHub Repository: sudo-project/sudo
 Path: blob/main/lib/util/hexchar.c
1532 views
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/*

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 * SPDX-License-Identifier: ISC

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 *

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 * Copyright (c) 2013-2015, 2023 Todd C. Miller <[email protected]>

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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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#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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