1 | /* $NetBSD: cmp.c,v 1.15 2006/01/19 20:44:57 garbled Exp $ */
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2 | /* $NetBSD: misc.c,v 1.11 2007/08/22 16:59:19 christos Exp $ */
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3 | /* $NetBSD: regular.c,v 1.20 2006/06/03 21:47:55 christos Exp $ */
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4 | /* $NetBSD: special.c,v 1.12 2007/08/21 14:09:54 christos Exp $ */
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5 |
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6 | /*
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7 | * Copyright (c) 1987, 1990, 1993, 1994
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8 | * The Regents of the University of California. All rights reserved.
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9 | *
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10 | * Redistribution and use in source and binary forms, with or without
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11 | * modification, are permitted provided that the following conditions
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12 | * are met:
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13 | * 1. Redistributions of source code must retain the above copyright
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14 | * notice, this list of conditions and the following disclaimer.
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15 | * 2. Redistributions in binary form must reproduce the above copyright
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16 | * notice, this list of conditions and the following disclaimer in the
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17 | * documentation and/or other materials provided with the distribution.
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18 | * 3. Neither the name of the University nor the names of its contributors
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19 | * may be used to endorse or promote products derived from this software
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20 | * without specific prior written permission.
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21 | *
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22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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32 | * SUCH DAMAGE.
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33 | */
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34 |
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35 | /*__COPYRIGHT("@(#) Copyright (c) 1987, 1990, 1993, 1994\n\
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36 | The Regents of the University of California. All rights reserved.\n");*/
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37 |
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38 | #include "config.h"
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39 | #include <sys/types.h>
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40 | #include <sys/stat.h>
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41 | #if defined(__FreeBSD__) || defined(__NetBSD__) /** @todo more mmap capable OSes. */
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42 | # define CMP_USE_MMAP
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43 | # include <sys/param.h>
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44 | # include <sys/mman.h>
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45 | #endif
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46 | #include <errno.h>
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47 | #include <fcntl.h>
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48 | #include <stdio.h>
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49 | #include <stdlib.h>
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50 | #include <string.h>
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51 | #ifndef _MSC_VER
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52 | # include <unistd.h>
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53 | # ifndef O_BINARY
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54 | # define O_BINARY 0
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55 | # endif
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56 | #else
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57 | # define MSC_DO_64_BIT_IO
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58 | # include "mscfakes.h"
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59 | #endif
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60 | #include "err.h"
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61 |
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62 | #include "cmp_extern.h"
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63 |
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64 |
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65 | static int
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66 | errmsg(const char *file, off_t byte, off_t line, int lflag)
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67 | {
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68 | if (lflag)
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69 | #ifdef _MSC_VER
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70 | return err(ERR_EXIT, "%s: char %I64d, line %lld", file, (__int64)byte, (long long)line);
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71 | #else
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72 | return err(ERR_EXIT, "%s: char %lld, line %lld", file, (long long)byte, (long long)line);
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73 | #endif
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74 | return err(ERR_EXIT, "%s", file);
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75 | }
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76 |
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77 |
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78 | static int
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79 | eofmsg(const char *file, off_t byte, off_t line, int sflag, int lflag)
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80 | {
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81 | if (!sflag)
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82 | {
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83 | if (!lflag)
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84 | warnx("EOF on %s", file);
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85 | else
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86 | {
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87 | #ifdef _MSC_VER
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88 | if (line > 0)
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89 | warnx("EOF on %s: char %I64d, line %I64d", file, (__int64)byte, (__int64)line);
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90 | else
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91 | warnx("EOF on %s: char %I64d", file, (__int64)byte);
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92 | #else
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93 | if (line > 0)
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94 | warnx("EOF on %s: char %lld, line %lld", file, (long long)byte, (long long)line);
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95 | else
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96 | warnx("EOF on %s: char %lld", file, (long long)byte);
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97 | #endif
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98 | }
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99 | }
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100 | return DIFF_EXIT;
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101 | }
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102 |
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103 |
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104 | static int
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105 | diffmsg(const char *file1, const char *file2, off_t byte, off_t line, int sflag)
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106 | {
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107 | if (!sflag)
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108 | #ifdef _MSC_VER
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109 | printf("%s %s differ: char %I64d, line %I64d\n",
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110 | file1, file2, (__int64)byte, (__int64)line);
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111 | #else
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112 | printf("%s %s differ: char %lld, line %lld\n",
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113 | file1, file2, (long long)byte, (long long)line);
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114 | #endif
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115 | return DIFF_EXIT;
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116 | }
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117 |
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118 |
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119 | /**
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120 | * Compares two files, where one or both are non-regular ones.
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121 | */
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122 | static int
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123 | c_special(int fd1, const char *file1, off_t skip1,
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124 | int fd2, const char *file2, off_t skip2,
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125 | int lflag, int sflag)
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126 | {
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127 | int fd1dup, fd2dup;
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128 | FILE *fp1;
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129 | int rc;
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130 |
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131 | /* duplicate because fdopen+fclose will otherwise close the handle. */
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132 | fd1dup = dup(fd1);
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133 | if (fd1 < 0)
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134 | return err(ERR_EXIT, "%s", file1);
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135 | fp1 = fdopen(fd1dup, "rb");
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136 | if (!fp1)
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137 | fp1 = fdopen(fd1dup, "r");
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138 | if (!fp1)
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139 | {
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140 | err(ERR_EXIT, "%s", file1);
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141 | close(fd1dup);
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142 | return ERR_EXIT;
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143 | }
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144 |
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145 | fd2dup = dup(fd2);
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146 | if (fd2dup >= 0)
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147 | {
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148 | FILE *fp2 = fdopen(fd2dup, "rb");
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149 | if (!fp2)
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150 | fp2 = fdopen(fd2dup, "r");
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151 | if (fp2)
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152 | {
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153 | off_t byte;
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154 | off_t line;
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155 | int ch1 = 0;
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156 | int ch2 = 0;
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157 |
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158 | /* skipping ahead */
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159 | rc = OK_EXIT;
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160 | for (byte = line = 1; skip1--; byte++)
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161 | {
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162 | ch1 = getc(fp1);
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163 | if (ch1 == EOF)
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164 | break;
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165 | if (ch1 == '\n')
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166 | line++;
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167 | }
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168 | for (byte = line = 1; skip2--; byte++)
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169 | {
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170 | ch2 = getc(fp2);
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171 | if (ch2 == EOF)
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172 | break;
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173 | if (ch2 == '\n')
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174 | line++;
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175 | }
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176 | if (ch2 != EOF && ch1 != EOF)
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177 | {
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178 | /* compare byte by byte */
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179 | for (byte = line = 1;; ++byte)
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180 | {
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181 | ch1 = getc(fp1);
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182 | ch2 = getc(fp2);
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183 | if (ch1 == EOF || ch2 == EOF)
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184 | break;
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185 | if (ch1 != ch2)
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186 | {
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187 | if (!lflag)
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188 | {
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189 | rc = diffmsg(file1, file2, byte, line, sflag);
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190 | break;
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191 | }
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192 | rc = DIFF_EXIT;
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193 | #ifdef _MSC_VER
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194 | printf("%6i64d %3o %3o\n", (__int64)byte, ch1, ch2);
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195 | #else
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196 | printf("%6lld %3o %3o\n", (long long)byte, ch1, ch2);
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197 | #endif
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198 | }
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199 | if (ch1 == '\n')
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200 | ++line;
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201 | }
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202 | }
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203 |
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204 | /* Check for errors and length differences (EOF). */
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205 | if (ferror(fp1) && rc != ERR_EXIT)
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206 | rc = errmsg(file1, byte, line, lflag);
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207 | if (ferror(fp2) && rc != ERR_EXIT)
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208 | rc = errmsg(file2, byte, line, lflag);
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209 | if (rc == OK_EXIT)
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210 | {
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211 | if (feof(fp1))
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212 | {
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213 | if (!feof(fp2))
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214 | rc = eofmsg(file1, byte, line, sflag, lflag);
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215 | }
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216 | else if (feof(fp2))
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217 | rc = eofmsg(file2, byte, line, sflag, lflag);
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218 | }
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219 |
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220 | fclose(fp2);
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221 | }
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222 | else
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223 | {
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224 | rc = err(ERR_EXIT, "%s", file2);
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225 | close(fd2dup);
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226 | }
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227 | }
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228 | else
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229 | rc = err(ERR_EXIT, "%s", file2);
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230 |
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231 | fclose(fp1);
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232 | return rc;
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233 | }
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234 |
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235 |
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236 | #ifdef CMP_USE_MMAP
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237 | /**
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238 | * Compare two files using mmap.
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239 | */
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240 | static int
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241 | c_regular(int fd1, const char *file1, off_t skip1, off_t len1,
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242 | int fd2, const char *file2, off_t skip2, off_t len2, int sflag, int lflag)
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243 | {
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244 | unsigned char ch, *p1, *p2, *b1, *b2;
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245 | off_t byte, length, line;
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246 | int dfound;
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247 | size_t blk_sz, blk_cnt;
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248 |
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249 | if (sflag && len1 != len2)
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250 | return DIFF_EXIT;
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251 |
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252 | if (skip1 > len1)
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253 | return eofmsg(file1, len1 + 1, 0, sflag, lflag);
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254 | len1 -= skip1;
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255 | if (skip2 > len2)
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256 | return eofmsg(file2, len2 + 1, 0, sflag, lflag);
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257 | len2 -= skip2;
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258 |
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259 | byte = line = 1;
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260 | dfound = 0;
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261 | length = len1 <= len2 ? len1 : len2;
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262 | for (blk_sz = 1024 * 1024; length != 0; length -= blk_sz)
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263 | {
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264 | if (blk_sz > length)
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265 | blk_sz = length;
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266 | b1 = p1 = mmap(NULL, blk_sz, PROT_READ, MAP_FILE | MAP_SHARED, fd1, skip1);
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267 | if (p1 == MAP_FAILED)
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268 | goto l_mmap_failed;
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269 |
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270 | b2 = p2 = mmap(NULL, blk_sz, PROT_READ, MAP_FILE | MAP_SHARED, fd2, skip2);
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271 | if (p2 == MAP_FAILED)
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272 | {
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273 | munmap(p1, blk_sz);
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274 | goto l_mmap_failed;
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275 | }
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276 |
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277 | blk_cnt = blk_sz;
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278 | for (; blk_cnt--; ++p1, ++p2, ++byte)
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279 | {
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280 | if ((ch = *p1) != *p2)
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281 | {
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282 | if (!lflag)
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283 | {
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284 | munmap(b1, blk_sz);
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285 | munmap(b2, blk_sz);
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286 | return diffmsg(file1, file2, byte, line, sflag);
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287 | }
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288 | dfound = 1;
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289 | #ifdef _MSC_VER
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290 | printf("%6I64d %3o %3o\n", (__int64)byte, ch, *p2);
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291 | #else
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292 | printf("%6lld %3o %3o\n", (long long)byte, ch, *p2);
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293 | #endif
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294 | }
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295 | if (ch == '\n')
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296 | ++line;
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297 | }
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298 | munmap(p1 - blk_sz, blk_sz);
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299 | munmap(p2 - blk_sz, blk_sz);
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300 | skip1 += blk_sz;
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301 | skip2 += blk_sz;
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302 | }
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303 |
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304 | if (len1 != len2)
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305 | return eofmsg(len1 > len2 ? file2 : file1, byte, line, sflag, lflag);
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306 | if (dfound)
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307 | return DIFF_EXIT;
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308 | return OK_EXIT;
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309 |
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310 | l_mmap_failed:
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311 | return c_special(fd1, file1, skip1, fd2, file2, skip2, lflag, sflag);
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312 | }
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313 |
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314 | #else /* non-mmap c_regular: */
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315 |
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316 | /**
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317 | * Compare two files without mmaping them.
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318 | */
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319 | static int
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320 | c_regular(int fd1, const char *file1, off_t skip1, off_t len1,
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321 | int fd2, const char *file2, off_t skip2, off_t len2, int sflag, int lflag)
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322 | {
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323 | unsigned char ch, *p1, *p2, *b1 = 0, *b2 = 0;
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324 | off_t byte, length, line, bytes_read;
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325 | int dfound;
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326 | size_t blk_sz, blk_cnt;
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327 |
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328 | if (sflag && len1 != len2)
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329 | return DIFF_EXIT;
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330 |
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331 | if (skip1 > len1)
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332 | return eofmsg(file1, len1 + 1, 0, sflag, lflag);
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333 | len1 -= skip1;
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334 | if (skip2 > len2)
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335 | return eofmsg(file2, len2 + 1, 0, sflag, lflag);
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336 | len2 -= skip2;
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337 |
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338 | if (skip1 && lseek(fd1, skip1, SEEK_SET) < 0)
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339 | goto l_special;
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340 | if (skip2 && lseek(fd2, skip2, SEEK_SET) < 0)
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341 | {
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342 | if (skip1 && lseek(fd1, 0, SEEK_SET) < 0)
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343 | return err(1, "seek failed");
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344 | goto l_special;
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345 | }
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346 |
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347 | #define CMP_BUF_SIZE (128*1024)
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348 |
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349 | b1 = malloc(CMP_BUF_SIZE);
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350 | b2 = malloc(CMP_BUF_SIZE);
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351 | if (!b1 || !b2)
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352 | goto l_malloc_failed;
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353 |
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354 | byte = line = 1;
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355 | dfound = 0;
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356 | length = len1;
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357 | if (length > len2)
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358 | length = len2;
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359 | for (blk_sz = CMP_BUF_SIZE; length != 0; length -= blk_sz)
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360 | {
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361 | if ((off_t)blk_sz > length)
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362 | blk_sz = length;
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363 |
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364 | bytes_read = read(fd1, b1, blk_sz);
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365 | if (bytes_read != blk_sz)
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366 | goto l_read_error;
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367 |
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368 | bytes_read = read(fd2, b2, blk_sz);
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369 | if (bytes_read != blk_sz)
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370 | goto l_read_error;
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371 |
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372 | blk_cnt = blk_sz;
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373 | p1 = b1;
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374 | p2 = b2;
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375 | for (; blk_cnt--; ++p1, ++p2, ++byte)
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376 | {
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377 | if ((ch = *p1) != *p2)
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378 | {
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379 | if (!lflag)
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380 | {
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381 | free(b1);
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382 | free(b2);
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383 | return diffmsg(file1, file2, byte, line, sflag);
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384 | }
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385 | dfound = 1;
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386 | #ifdef _MSC_VER
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387 | printf("%6I64d %3o %3o\n", (__int64)byte, ch, *p2);
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388 | #else
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389 | printf("%6lld %3o %3o\n", (long long)byte, ch, *p2);
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390 | #endif
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391 | }
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392 | if (ch == '\n')
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393 | ++line;
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394 | }
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395 | skip1 += blk_sz;
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396 | skip2 += blk_sz;
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397 | }
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398 |
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399 | if (len1 != len2)
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400 | return eofmsg(len1 > len2 ? file2 : file1, byte, line, sflag, lflag);
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401 | if (dfound)
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402 | return DIFF_EXIT;
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403 | return OK_EXIT;
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404 |
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405 | l_read_error:
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406 | if ( lseek(fd1, 0, SEEK_SET) < 0
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407 | || lseek(fd2, 0, SEEK_SET) < 0)
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408 | {
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409 | err(1, "seek failed");
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410 | free(b1);
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411 | free(b2);
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412 | return 1;
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413 | }
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414 | l_malloc_failed:
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415 | free(b1);
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416 | free(b2);
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417 | l_special:
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418 | return c_special(fd1, file1, skip1, fd2, file2, skip2, lflag, sflag);
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419 | }
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420 | #endif /* non-mmap c_regular */
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421 |
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422 |
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423 | /**
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424 | * Compares two open files.
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425 | */
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426 | int
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427 | cmp_fd_and_fd_ex(int fd1, const char *file1, off_t skip1,
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428 | int fd2, const char *file2, off_t skip2,
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429 | int sflag, int lflag, int special)
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430 | {
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431 | struct stat st1, st2;
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432 | int rc;
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433 |
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434 | if (fstat(fd1, &st1))
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435 | return err(ERR_EXIT, "%s", file1);
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436 | if (fstat(fd2, &st2))
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437 | return err(ERR_EXIT, "%s", file2);
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438 |
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439 | if ( !S_ISREG(st1.st_mode)
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440 | || !S_ISREG(st2.st_mode)
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441 | || special)
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442 | rc = c_special(fd1, file1, skip1,
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443 | fd2, file2, skip2, sflag, lflag);
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444 | else
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445 | rc = c_regular(fd1, file1, skip1, st1.st_size,
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446 | fd2, file2, skip2, st2.st_size, sflag, lflag);
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447 | return rc;
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448 | }
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449 |
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450 |
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451 | /**
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452 | * Compares two open files.
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453 | */
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454 | int
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455 | cmp_fd_and_fd(int fd1, const char *file1,
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456 | int fd2, const char *file2,
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457 | int sflag, int lflag, int special)
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458 | {
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459 | return cmp_fd_and_fd_ex(fd1, file1, 0, fd2, file2, 0, sflag, lflag, special);
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460 | }
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461 |
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462 |
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463 | /**
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464 | * Compares an open file with another that isn't open yet.
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465 | */
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466 | int
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467 | cmp_fd_and_file_ex(int fd1, const char *file1, off_t skip1,
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468 | const char *file2, off_t skip2,
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469 | int sflag, int lflag, int special)
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470 | {
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471 | int rc;
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472 | int fd2;
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473 |
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474 | if (!strcmp(file2, "-"))
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475 | {
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476 | fd2 = 0 /* stdin */;
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477 | special = 1;
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478 | file2 = "stdin";
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479 | }
|
---|
480 | else
|
---|
481 | fd2 = open(file2, O_RDONLY | O_BINARY, 0);
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482 | if (fd2 >= 0)
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483 | {
|
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484 | rc = cmp_fd_and_fd_ex(fd1, file1, skip1,
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485 | fd2, file2, skip2, sflag, lflag, special);
|
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486 | close(fd2);
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487 | }
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488 | else
|
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489 | {
|
---|
490 | if (!sflag)
|
---|
491 | warn("%s", file2);
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492 | rc = ERR_EXIT;
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493 | }
|
---|
494 | return rc;
|
---|
495 | }
|
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496 |
|
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497 |
|
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498 | /**
|
---|
499 | * Compares an open file with another that isn't open yet.
|
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500 | */
|
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501 | int
|
---|
502 | cmp_fd_and_file(int fd1, const char *file1,
|
---|
503 | const char *file2,
|
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504 | int sflag, int lflag, int special)
|
---|
505 | {
|
---|
506 | return cmp_fd_and_file_ex(fd1, file1, 0,
|
---|
507 | file2, 0, sflag, lflag, special);
|
---|
508 | }
|
---|
509 |
|
---|
510 |
|
---|
511 | /**
|
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512 | * Opens and compare two files.
|
---|
513 | */
|
---|
514 | int
|
---|
515 | cmp_file_and_file_ex(const char *file1, off_t skip1,
|
---|
516 | const char *file2, off_t skip2,
|
---|
517 | int sflag, int lflag, int special)
|
---|
518 | {
|
---|
519 | int fd1;
|
---|
520 | int rc;
|
---|
521 |
|
---|
522 | if (lflag && sflag)
|
---|
523 | return errx(ERR_EXIT, "only one of -l and -s may be specified");
|
---|
524 |
|
---|
525 | if (!strcmp(file1, "-"))
|
---|
526 | {
|
---|
527 | if (!strcmp(file2, "-"))
|
---|
528 | return errx(ERR_EXIT, "standard input may only be specified once");
|
---|
529 | file1 = "stdin";
|
---|
530 | fd1 = 1;
|
---|
531 | special = 1;
|
---|
532 | }
|
---|
533 | else
|
---|
534 | fd1 = open(file1, O_RDONLY | O_BINARY, 0);
|
---|
535 | if (fd1 >= 0)
|
---|
536 | {
|
---|
537 | rc = cmp_fd_and_file_ex(fd1, file1, skip1,
|
---|
538 | file2, skip2, sflag, lflag, special);
|
---|
539 | close(fd1);
|
---|
540 | }
|
---|
541 | else
|
---|
542 | {
|
---|
543 | if (!sflag)
|
---|
544 | warn("%s", file1);
|
---|
545 | rc = ERR_EXIT;
|
---|
546 | }
|
---|
547 |
|
---|
548 | return rc;
|
---|
549 | }
|
---|
550 |
|
---|
551 |
|
---|
552 | /**
|
---|
553 | * Opens and compare two files.
|
---|
554 | */
|
---|
555 | int
|
---|
556 | cmp_file_and_file(const char *file1, const char *file2, int sflag, int lflag, int special)
|
---|
557 | {
|
---|
558 | return cmp_file_and_file_ex(file1, 0, file2, 0, sflag, lflag, special);
|
---|
559 | }
|
---|
560 |
|
---|