Uwe Hermann | 8cc38d2 | 2008-03-27 23:26:40 +0000 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the libpayload project. |
| 3 | * |
| 4 | * Copyright (C) 2008 Uwe Hermann <uwe@hermann-uwe.de> |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * 3. The name of the author may not be used to endorse or promote products |
| 15 | * derived from this software without specific prior written permission. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 27 | * SUCH DAMAGE. |
| 28 | */ |
| 29 | |
Uwe Hermann | b103345 | 2008-04-11 18:38:04 +0000 | [diff] [blame] | 30 | #include <libpayload.h> |
| 31 | |
Uwe Hermann | 8cc38d2 | 2008-03-27 23:26:40 +0000 | [diff] [blame] | 32 | /* |
| 33 | * Convert a number in BCD format to decimal. |
| 34 | * |
| 35 | * @param b The BCD number. |
| 36 | * @return The given BCD number in decimal format. |
| 37 | */ |
| 38 | int bcd2dec(int b) |
| 39 | { |
| 40 | return ((b >> 4) & 0x0f) * 10 + (b & 0x0f); |
| 41 | } |
| 42 | |
| 43 | /* |
| 44 | * Convert a number in decimal format into the BCD format. |
| 45 | * |
| 46 | * @param d The decimal number. |
| 47 | * @return The given decimal number in BCD format. |
| 48 | */ |
| 49 | int dec2bcd(int d) |
| 50 | { |
| 51 | return ((d / 10) << 4) | (d % 10); |
| 52 | } |
| 53 | |
Uwe Hermann | b103345 | 2008-04-11 18:38:04 +0000 | [diff] [blame] | 54 | /** |
| 55 | * Return the absolute value of the specified integer. |
| 56 | * |
Uwe Hermann | 54ec0af | 2008-08-26 19:37:37 +0000 | [diff] [blame] | 57 | * @param j The integer of which we want to know the absolute value. |
Uwe Hermann | b103345 | 2008-04-11 18:38:04 +0000 | [diff] [blame] | 58 | * @return The absolute value of the specified integer. |
| 59 | */ |
| 60 | int abs(int j) |
| 61 | { |
| 62 | return (j >= 0 ? j : -j); |
| 63 | } |
| 64 | |
| 65 | long int labs(long int j) |
| 66 | { |
| 67 | return (j >= 0 ? j : -j); |
| 68 | } |
| 69 | |
| 70 | long long int llabs(long long int j) |
| 71 | { |
| 72 | return (j >= 0 ? j : -j); |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * Given a 4-bit value, return the ASCII hex representation of it. |
| 77 | * |
| 78 | * @param b A 4-bit value which shall be converted to ASCII hex. |
| 79 | * @return The ASCII hex representation of the specified 4-bit value. |
| 80 | * Returned hex-characters will always be lower-case (a-f, not A-F). |
| 81 | */ |
| 82 | u8 bin2hex(u8 b) |
| 83 | { |
| 84 | return (b < 10) ? '0' + b : 'a' + (b - 10); |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * Given an ASCII hex input character, return its integer value. |
| 89 | * |
| 90 | * For example, the input value '6' will be converted to 6, 'a'/'A' will |
| 91 | * be converted to 10, 'f'/'F' will be converted to 15, and so on. |
| 92 | * |
| 93 | * The return value for invalid input characters is 0. |
| 94 | * |
| 95 | * @param h The input byte in ASCII hex format. |
| 96 | * @return The integer value of the specified ASCII hex byte. |
| 97 | */ |
| 98 | u8 hex2bin(u8 h) |
| 99 | { |
| 100 | return (('0' <= h && h <= '9') ? (h - '0') : \ |
| 101 | ('A' <= h && h <= 'F') ? (h - 'A' + 10) : \ |
| 102 | ('a' <= h && h <= 'f') ? (h - 'a' + 10) : 0); |
| 103 | } |
Stefan Reinauer | 6e51cee | 2008-08-19 17:47:18 +0000 | [diff] [blame] | 104 | |
| 105 | /** |
| 106 | * Enters HALT state, after printing msg |
| 107 | * |
| 108 | * @param msg message to print |
| 109 | */ |
| 110 | void fatal(const char *msg) |
| 111 | { |
Patrick Georgi | b912289 | 2011-02-14 19:26:22 +0000 | [diff] [blame] | 112 | fprintf(stderr, "%s",msg); |
Stefan Reinauer | 6e51cee | 2008-08-19 17:47:18 +0000 | [diff] [blame] | 113 | halt(); |
| 114 | } |
| 115 | |
Patrick Georgi | 980a69b | 2010-06-24 11:16:10 +0000 | [diff] [blame] | 116 | void exit(int status) |
| 117 | { |
| 118 | printf("exited with status %d\n", status); |
| 119 | halt(); |
| 120 | } |
| 121 | |
| 122 | int errno; |
Patrick Georgi | dd3e690 | 2011-07-12 15:50:54 +0200 | [diff] [blame] | 123 | |
| 124 | char *getenv(const char *name) |
| 125 | { |
| 126 | return NULL; |
| 127 | } |