/* * SPDX-License-Identifier: ISC * * Copyright (c) 2013-2015 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 <sys/types.h> #include <stdio.h> #include "sudoers.h" /* * Converts a two-byte hex string to decimal. * Returns the decimal value or -1 for invalid input. */ int hexchar(const char *s) { unsigned char result[2]; int i; debug_decl(hexchar, SUDOERS_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]); }