/* * This file is part of the libpayload project. * * Copyright (C) 2008 Uwe Hermann <uwe@hermann-uwe.de> * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <libpayload.h> /* * Convert a number in BCD format to decimal. * * @param b The BCD number. * @return The given BCD number in decimal format. */ int bcd2dec(int b) { return ((b >> 4) & 0x0f) * 10 + (b & 0x0f); } /* * Convert a number in decimal format into the BCD format. * * @param d The decimal number. * @return The given decimal number in BCD format. */ int dec2bcd(int d) { return ((d / 10) << 4) | (d % 10); } /** * Return the absolute value of the specified integer. * * @param j The integer of which we want to know the absolute value. * @return The absolute value of the specified integer. */ int abs(int j) { return (j >= 0 ? j : -j); } long int labs(long int j) { return (j >= 0 ? j : -j); } long long int llabs(long long int j) { return (j >= 0 ? j : -j); } /** * Given a 4-bit value, return the ASCII hex representation of it. * * @param b A 4-bit value which shall be converted to ASCII hex. * @return The ASCII hex representation of the specified 4-bit value. * Returned hex-characters will always be lower-case (a-f, not A-F). */ u8 bin2hex(u8 b) { return (b < 10) ? '0' + b : 'a' + (b - 10); } /** * Given an ASCII hex input character, return its integer value. * * For example, the input value '6' will be converted to 6, 'a'/'A' will * be converted to 10, 'f'/'F' will be converted to 15, and so on. * * The return value for invalid input characters is 0. * * @param h The input byte in ASCII hex format. * @return The integer value of the specified ASCII hex byte. */ u8 hex2bin(u8 h) { return (('0' <= h && h <= '9') ? (h - '0') : \ ('A' <= h && h <= 'F') ? (h - 'A' + 10) : \ ('a' <= h && h <= 'f') ? (h - 'a' + 10) : 0); } /** * Enters HALT state, after printing msg * * @param msg message to print */ void fatal(const char *msg) { fprintf(stderr, "%s",msg); halt(); } void exit(int status) { printf("exited with status %d\n", status); halt(); } int errno; char *getenv(const char *name) { return NULL; }