1 | /* |
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2 | * zzuf - general purpose fuzzer |
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3 | * Copyright (c) 2006-2010 Sam Hocevar <sam@hocevar.net> |
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4 | * All Rights Reserved |
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5 | * |
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6 | * This program is free software. It comes without any warranty, to |
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7 | * the extent permitted by applicable law. You can redistribute it |
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8 | * and/or modify it under the terms of the Do What The Fuck You Want |
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9 | * To Public License, Version 2, as published by Sam Hocevar. See |
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10 | * http://sam.zoy.org/wtfpl/COPYING for more details. |
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11 | */ |
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12 | |
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13 | /* |
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14 | * debug.c: debugging support |
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15 | */ |
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16 | |
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17 | #include "config.h" |
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18 | |
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19 | #if defined HAVE_STDINT_H |
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20 | # include <stdint.h> |
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21 | #elif defined HAVE_INTTYPES_H |
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22 | # include <inttypes.h> |
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23 | #endif |
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24 | #include <stdio.h> |
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25 | #include <string.h> |
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26 | #if defined HAVE_UNISTD_H |
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27 | # include <unistd.h> |
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28 | #endif |
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29 | #if defined HAVE_IO_H |
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30 | # include <io.h> |
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31 | #endif |
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32 | #include <errno.h> |
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33 | #include <stdarg.h> |
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34 | |
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35 | #include "debug.h" |
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36 | #include "libzzuf.h" |
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37 | |
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38 | static void mydebug(char const *format, va_list args); |
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39 | |
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40 | /** |
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41 | * Helper macro to write an integer value to a given file descriptor, |
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42 | * either in base 10 or in hexadecimal. |
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43 | */ |
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44 | #define WRITE_INT(i, base) \ |
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45 | do \ |
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46 | { \ |
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47 | char buf[128], *b = buf + 127; \ |
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48 | if(i <= 0) \ |
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49 | append((i = -i) ? "-" : "0", 1); /* XXX: hack here */ \ |
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50 | while(i) \ |
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51 | { \ |
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52 | *b-- = hex2char[i % base]; \ |
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53 | i /= base; \ |
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54 | } \ |
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55 | append(b + 1, (int)(buf + 127 - b)); \ |
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56 | } while(0) |
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57 | |
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58 | /* Temporary buffer for deferred output */ |
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59 | char debugbuffer[BUFSIZ]; |
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60 | size_t debugcount = 1; |
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61 | |
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62 | void _zz_debug(char const *format, ...) |
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63 | { |
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64 | va_list args; |
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65 | va_start(args, format); |
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66 | if (_zz_debuglevel >= 1) |
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67 | mydebug(format, args); |
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68 | va_end(args); |
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69 | } |
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70 | |
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71 | void _zz_debug2(char const *format, ...) |
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72 | { |
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73 | va_list args; |
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74 | va_start(args, format); |
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75 | if (_zz_debuglevel >= 2) |
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76 | mydebug(format, args); |
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77 | va_end(args); |
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78 | } |
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79 | |
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80 | /** |
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81 | * Format a string, printf-like, and write the resulting data to zzuf's |
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82 | * debug file descriptor _zz_debugfd. If the debug file descriptor is |
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83 | * still -1, this function does nothing. |
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84 | * |
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85 | * This function's code is roughly equivalent to the following *printf |
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86 | * calls, except it only uses signal-safe functions: |
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87 | * - fprintf(stderr, "** zzuf debug ** "); |
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88 | * - vfprintf(stderr, format, args); |
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89 | * - fprintf(stderr, "\n"); |
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90 | */ |
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91 | static inline void append(void const *data, size_t count) |
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92 | { |
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93 | if (debugcount + count <= sizeof(debugbuffer)) |
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94 | { |
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95 | memcpy(debugbuffer + debugcount, data, count); |
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96 | debugcount += count; |
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97 | } |
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98 | } |
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99 | |
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100 | static void mydebug(char const *format, va_list args) |
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101 | { |
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102 | static char const *hex2char = "0123456789abcdef"; |
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103 | char const *f; |
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104 | int saved_errno; |
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105 | |
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106 | saved_errno = errno; |
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107 | |
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108 | /* If there is spare data and the debug fd is open, we send the data */ |
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109 | if (debugcount && _zz_debugfd >= 0) |
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110 | { |
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111 | write(_zz_debugfd, debugbuffer, debugcount); |
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112 | debugcount = 0; |
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113 | } |
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114 | |
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115 | append("** zzuf debug ** ", 17); |
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116 | for(f = format; *f; f++) |
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117 | { |
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118 | if(*f != '%') |
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119 | { |
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120 | append(f, 1); |
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121 | continue; |
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122 | } |
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123 | |
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124 | f++; |
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125 | if(!*f) |
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126 | break; |
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127 | |
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128 | if(*f == 'c') |
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129 | { |
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130 | char i = (char)(unsigned char)va_arg(args, int); |
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131 | if(i >= 0x20 && i < 0x7f) |
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132 | append(&i, 1); |
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133 | else if(i == '\n') |
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134 | append("\\n", 2); |
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135 | else if(i == '\t') |
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136 | append("\\t", 2); |
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137 | else if(i == '\r') |
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138 | append("\\r", 2); |
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139 | else |
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140 | { |
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141 | append("\\x", 2); |
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142 | append(hex2char + ((i & 0xf0) >> 4), 1); |
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143 | append(hex2char + (i & 0x0f), 1); |
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144 | } |
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145 | } |
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146 | else if(*f == 'i' || *f == 'd') |
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147 | { |
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148 | int i = va_arg(args, int); |
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149 | WRITE_INT(i, 10); |
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150 | } |
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151 | else if(*f == 'x') |
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152 | { |
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153 | int i = va_arg(args, int); |
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154 | WRITE_INT(i, 16); |
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155 | } |
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156 | else if(f[0] == 'l' && (f[1] == 'i' || f[1] == 'd')) |
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157 | { |
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158 | long int i = va_arg(args, long int); |
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159 | WRITE_INT(i, 10); |
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160 | f++; |
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161 | } |
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162 | else if(f[0] == 'l' && f[1] == 'l' && (f[2] == 'i' || f[1] == 'd')) |
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163 | { |
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164 | long long int i = va_arg(args, long long int); |
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165 | WRITE_INT(i, 10); |
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166 | f += 2; |
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167 | } |
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168 | else if(f[0] == 'g') |
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169 | { |
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170 | double g = va_arg(args, double), h = 0.0000001; |
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171 | int i = (int)g; |
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172 | WRITE_INT(i, 10); |
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173 | for(i = 0; i < 7; i++) |
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174 | { |
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175 | g = (g - (int)g) * 10; |
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176 | h *= 10; |
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177 | if(g < h) |
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178 | break; |
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179 | if(i == 0) |
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180 | append(".", 1); |
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181 | append(hex2char + (int)g, 1); |
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182 | } |
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183 | } |
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184 | else if(f[0] == 'p') |
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185 | { |
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186 | uintptr_t i = va_arg(args, uintptr_t); |
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187 | if(!i) |
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188 | append("NULL", 4); |
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189 | else |
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190 | { |
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191 | append("0x", 2); |
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192 | WRITE_INT(i, 16); |
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193 | } |
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194 | } |
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195 | else if(f[0] == 's') |
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196 | { |
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197 | char *s = va_arg(args, char *); |
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198 | if(!s) |
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199 | append("(nil)", 5); |
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200 | else |
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201 | { |
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202 | int l = 0; |
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203 | while(s[l]) |
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204 | l++; |
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205 | append(s, l); |
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206 | } |
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207 | } |
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208 | else if(f[0] == '0' && f[1] == '2' && f[2] == 'x') |
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209 | { |
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210 | int i = va_arg(args, int); |
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211 | append(hex2char + ((i & 0xf0) >> 4), 1); |
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212 | append(hex2char + (i & 0x0f), 1); |
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213 | f += 2; |
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214 | } |
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215 | else |
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216 | { |
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217 | append(f - 1, 2); |
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218 | } |
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219 | } |
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220 | append("\n", 1); |
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221 | |
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222 | /* If the debug fd is open, we send the data */ |
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223 | if (_zz_debugfd >= 0) |
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224 | { |
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225 | write(_zz_debugfd, debugbuffer, debugcount); |
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226 | debugcount = 0; |
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227 | } |
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228 | |
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229 | errno = saved_errno; |
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230 | } |
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231 | |
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