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 <sys/types.h>
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39 | #include <sys/stat.h>
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40 | #if defined(__FreeBSD__) || defined(__NetBSD__) /** @todo more mmap capable OSes. */
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41 | # define CMP_USE_MMAP
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42 | # include <sys/param.h>
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43 | # include <sys/mman.h>
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44 | #endif
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45 | #include <errno.h>
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46 | #include <fcntl.h>
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47 | #include <stdio.h>
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48 | #include <stdlib.h>
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49 | #include <string.h>
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50 | #ifndef _MSC_VER
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51 | # include <unistd.h>
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52 | # ifndef O_BINARY
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53 | # define O_BINARY 0
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54 | # endif
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55 | #else
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56 | # define MSC_DO_64_BIT_IO
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57 | # include "mscfakes.h"
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58 | #endif
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59 | #include "err.h"
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60 |
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61 | #include "cmp_extern.h"
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62 |
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63 |
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64 | static int
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65 | errmsg(const char *file, off_t byte, off_t line, int lflag)
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66 | {
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67 | if (lflag)
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68 | #ifdef _MSC_VER
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69 | return err(ERR_EXIT, "%s: char %I64d, line %lld", file, (__int64)byte, (long long)line);
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70 | #else
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71 | return err(ERR_EXIT, "%s: char %lld, line %lld", file, (long long)byte, (long long)line);
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72 | #endif
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73 | return err(ERR_EXIT, "%s", file);
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74 | }
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75 |
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76 |
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77 | static int
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78 | eofmsg(const char *file, off_t byte, off_t line, int sflag, int lflag)
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79 | {
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80 | if (!sflag)
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81 | {
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82 | if (!lflag)
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83 | warnx("EOF on %s", file);
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84 | else
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85 | {
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86 | #ifdef _MSC_VER
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87 | if (line > 0)
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88 | warnx("EOF on %s: char %I64d, line %I64d", file, (__int64)byte, (__int64)line);
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89 | else
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90 | warnx("EOF on %s: char %I64d", file, (__int64)byte);
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91 | #else
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92 | if (line > 0)
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93 | warnx("EOF on %s: char %lld, line %lld", file, (long long)byte, (long long)line);
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94 | else
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95 | warnx("EOF on %s: char %lld", file, (long long)byte);
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96 | #endif
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97 | }
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98 | }
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99 | return DIFF_EXIT;
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100 | }
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101 |
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102 |
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103 | static int
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104 | diffmsg(const char *file1, const char *file2, off_t byte, off_t line, int sflag)
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105 | {
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106 | if (!sflag)
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107 | #ifdef _MSC_VER
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108 | printf("%s %s differ: char %I64d, line %I64d\n",
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109 | file1, file2, (__int64)byte, (__int64)line);
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110 | #else
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111 | printf("%s %s differ: char %lld, line %lld\n",
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112 | file1, file2, (long long)byte, (long long)line);
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113 | #endif
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114 | return DIFF_EXIT;
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115 | }
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116 |
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117 |
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118 | /**
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119 | * Compares two files, where one or both are non-regular ones.
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120 | */
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121 | static int
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122 | c_special(int fd1, const char *file1, off_t skip1,
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123 | int fd2, const char *file2, off_t skip2,
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124 | int lflag, int sflag)
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125 | {
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126 | int fd1dup, fd2dup;
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127 | FILE *fp1;
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128 | int rc;
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129 |
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130 | /* duplicate because fdopen+fclose will otherwise close the handle. */
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131 | fd1dup = dup(fd1);
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132 | if (fd1 < 0)
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133 | return err(ERR_EXIT, "%s", file1);
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134 | fp1 = fdopen(fd1dup, "rb");
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135 | if (!fp1)
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136 | fp1 = fdopen(fd1dup, "r");
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137 | if (!fp1)
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138 | {
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139 | err(ERR_EXIT, "%s", file1);
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140 | close(fd1dup);
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141 | return ERR_EXIT;
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142 | }
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143 |
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144 | fd2dup = dup(fd2);
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145 | if (fd2dup >= 0)
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146 | {
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147 | FILE *fp2 = fdopen(fd2dup, "rb");
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148 | if (!fp2)
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149 | fp2 = fdopen(fd2dup, "r");
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150 | if (fp2)
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151 | {
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152 | off_t byte;
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153 | off_t line;
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154 | int ch1 = 0;
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155 | int ch2 = 0;
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156 |
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157 | /* skipping ahead */
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158 | rc = OK_EXIT;
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159 | for (byte = line = 1; skip1--; byte++)
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160 | {
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161 | ch1 = getc(fp1);
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162 | if (ch1 == EOF)
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163 | break;
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164 | if (ch1 == '\n')
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165 | line++;
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166 | }
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167 | for (byte = line = 1; skip2--; byte++)
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168 | {
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169 | ch2 = getc(fp2);
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170 | if (ch2 == EOF)
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171 | break;
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172 | if (ch2 == '\n')
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173 | line++;
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174 | }
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175 | if (ch2 != EOF && ch1 != EOF)
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176 | {
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177 | /* compare byte by byte */
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178 | for (byte = line = 1;; ++byte)
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179 | {
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180 | ch1 = getc(fp1);
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181 | ch2 = getc(fp2);
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182 | if (ch1 == EOF || ch2 == EOF)
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183 | break;
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184 | if (ch1 != ch2)
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185 | {
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186 | if (!lflag)
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187 | {
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188 | rc = diffmsg(file1, file2, byte, line, sflag);
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189 | break;
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190 | }
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191 | rc = DIFF_EXIT;
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192 | #ifdef _MSC_VER
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193 | printf("%6i64d %3o %3o\n", (__int64)byte, ch1, ch2);
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194 | #else
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195 | printf("%6lld %3o %3o\n", (long long)byte, ch1, ch2);
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196 | #endif
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197 | }
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198 | if (ch1 == '\n')
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199 | ++line;
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200 | }
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201 | }
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202 |
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203 | /* Check for errors and length differences (EOF). */
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204 | if (ferror(fp1) && rc != ERR_EXIT)
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205 | rc = errmsg(file1, byte, line, lflag);
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206 | if (ferror(fp2) && rc != ERR_EXIT)
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207 | rc = errmsg(file2, byte, line, lflag);
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208 | if (rc == OK_EXIT)
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209 | {
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210 | if (feof(fp1))
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211 | {
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212 | if (!feof(fp2))
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213 | rc = eofmsg(file1, byte, line, sflag, lflag);
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214 | }
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215 | else if (feof(fp2))
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216 | rc = eofmsg(file2, byte, line, sflag, lflag);
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217 | }
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218 |
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219 | fclose(fp2);
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220 | }
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221 | else
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222 | {
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223 | rc = err(ERR_EXIT, "%s", file2);
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224 | close(fd2dup);
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225 | }
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226 | }
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227 | else
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228 | rc = err(ERR_EXIT, "%s", file2);
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229 |
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230 | fclose(fp1);
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231 | return rc;
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232 | }
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233 |
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234 |
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235 | #ifdef CMP_USE_MMAP
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236 | /**
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237 | * Compare two files using mmap.
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238 | */
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239 | static int
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240 | c_regular(int fd1, const char *file1, off_t skip1, off_t len1,
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241 | int fd2, const char *file2, off_t skip2, off_t len2, int sflag, int lflag)
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242 | {
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243 | unsigned char ch, *p1, *p2, *b1, *b2;
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244 | off_t byte, length, line;
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245 | int dfound;
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246 | size_t blk_sz, blk_cnt;
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247 |
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248 | if (sflag && len1 != len2)
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249 | return DIFF_EXIT;
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250 |
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251 | if (skip1 > len1)
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252 | return eofmsg(file1, len1 + 1, 0, sflag, lflag);
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253 | len1 -= skip1;
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254 | if (skip2 > len2)
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255 | return eofmsg(file2, len2 + 1, 0, sflag, lflag);
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256 | len2 -= skip2;
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257 |
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258 | byte = line = 1;
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259 | dfound = 0;
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260 | length = len1 <= len2 ? len1 : len2;
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261 | for (blk_sz = 1024 * 1024; length != 0; length -= blk_sz)
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262 | {
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263 | if (blk_sz > length)
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264 | blk_sz = length;
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265 | b1 = p1 = mmap(NULL, blk_sz, PROT_READ, MAP_FILE | MAP_SHARED, fd1, skip1);
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266 | if (p1 == MAP_FAILED)
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267 | goto l_mmap_failed;
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268 |
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269 | b2 = p2 = mmap(NULL, blk_sz, PROT_READ, MAP_FILE | MAP_SHARED, fd2, skip2);
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270 | if (p2 == MAP_FAILED)
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271 | {
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272 | munmap(p1, blk_sz);
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273 | goto l_mmap_failed;
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274 | }
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275 |
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276 | blk_cnt = blk_sz;
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277 | for (; blk_cnt--; ++p1, ++p2, ++byte)
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278 | {
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279 | if ((ch = *p1) != *p2)
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280 | {
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281 | if (!lflag)
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282 | {
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283 | munmap(b1, blk_sz);
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284 | munmap(b2, blk_sz);
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285 | return diffmsg(file1, file2, byte, line, sflag);
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286 | }
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287 | dfound = 1;
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288 | #ifdef _MSC_VER
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289 | printf("%6I64d %3o %3o\n", (__int64)byte, ch, *p2);
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290 | #else
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291 | printf("%6lld %3o %3o\n", (long long)byte, ch, *p2);
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292 | #endif
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293 | }
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294 | if (ch == '\n')
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295 | ++line;
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296 | }
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297 | munmap(p1 - blk_sz, blk_sz);
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298 | munmap(p2 - blk_sz, blk_sz);
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299 | skip1 += blk_sz;
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300 | skip2 += blk_sz;
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301 | }
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302 |
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303 | if (len1 != len2)
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304 | return eofmsg(len1 > len2 ? file2 : file1, byte, line, sflag, lflag);
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305 | if (dfound)
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306 | return DIFF_EXIT;
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307 | return OK_EXIT;
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308 |
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309 | l_mmap_failed:
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310 | return c_special(fd1, file1, skip1, fd2, file2, skip2, lflag, sflag);
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311 | }
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312 |
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313 | #else /* non-mmap c_regular: */
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314 |
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315 | /**
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316 | * Compare two files without mmaping them.
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317 | */
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318 | static int
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319 | c_regular(int fd1, const char *file1, off_t skip1, off_t len1,
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320 | int fd2, const char *file2, off_t skip2, off_t len2, int sflag, int lflag)
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321 | {
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322 | unsigned char ch, *p1, *p2, *b1 = 0, *b2 = 0;
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323 | off_t byte, length, line, bytes_read;
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324 | int dfound;
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325 | size_t blk_sz, blk_cnt;
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326 |
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327 | if (sflag && len1 != len2)
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328 | return DIFF_EXIT;
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329 |
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330 | if (skip1 > len1)
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331 | return eofmsg(file1, len1 + 1, 0, sflag, lflag);
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332 | len1 -= skip1;
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333 | if (skip2 > len2)
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334 | return eofmsg(file2, len2 + 1, 0, sflag, lflag);
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335 | len2 -= skip2;
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336 |
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337 | if (skip1 && lseek(fd1, skip1, SEEK_SET) < 0)
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338 | goto l_special;
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339 | if (skip2 && lseek(fd2, skip2, SEEK_SET) < 0)
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340 | {
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341 | if (skip1 && lseek(fd1, 0, SEEK_SET) < 0)
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342 | return err(1, "seek failed");
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343 | goto l_special;
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344 | }
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345 |
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346 | #define CMP_BUF_SIZE (128*1024)
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347 |
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348 | b1 = malloc(CMP_BUF_SIZE);
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349 | b2 = malloc(CMP_BUF_SIZE);
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350 | if (!b1 || !b2)
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351 | goto l_malloc_failed;
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352 |
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353 | byte = line = 1;
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354 | dfound = 0;
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355 | length = len1;
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356 | if (length > len2)
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357 | length = len2;
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358 | for (blk_sz = CMP_BUF_SIZE; length != 0; length -= blk_sz)
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359 | {
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360 | if ((off_t)blk_sz > length)
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361 | blk_sz = length;
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362 |
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363 | bytes_read = read(fd1, b1, blk_sz);
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364 | if (bytes_read != blk_sz)
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365 | goto l_read_error;
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366 |
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367 | bytes_read = read(fd2, b2, blk_sz);
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368 | if (bytes_read != blk_sz)
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369 | goto l_read_error;
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370 |
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371 | blk_cnt = blk_sz;
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372 | p1 = b1;
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373 | p2 = b2;
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374 | for (; blk_cnt--; ++p1, ++p2, ++byte)
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375 | {
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376 | if ((ch = *p1) != *p2)
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377 | {
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378 | if (!lflag)
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379 | {
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380 | free(b1);
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381 | free(b2);
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382 | return diffmsg(file1, file2, byte, line, sflag);
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383 | }
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384 | dfound = 1;
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385 | #ifdef _MSC_VER
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386 | printf("%6I64d %3o %3o\n", (__int64)byte, ch, *p2);
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387 | #else
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388 | printf("%6lld %3o %3o\n", (long long)byte, ch, *p2);
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389 | #endif
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390 | }
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391 | if (ch == '\n')
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392 | ++line;
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393 | }
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394 | skip1 += blk_sz;
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395 | skip2 += blk_sz;
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396 | }
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397 |
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398 | if (len1 != len2)
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399 | return eofmsg(len1 > len2 ? file2 : file1, byte, line, sflag, lflag);
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400 | if (dfound)
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401 | return DIFF_EXIT;
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402 | return OK_EXIT;
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403 |
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404 | l_read_error:
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405 | if ( lseek(fd1, 0, SEEK_SET) < 0
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406 | || lseek(fd2, 0, SEEK_SET) < 0)
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407 | {
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408 | err(1, "seek failed");
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409 | free(b1);
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410 | free(b2);
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411 | return 1;
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412 | }
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413 | l_malloc_failed:
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414 | free(b1);
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415 | free(b2);
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416 | l_special:
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417 | return c_special(fd1, file1, skip1, fd2, file2, skip2, lflag, sflag);
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418 | }
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419 | #endif /* non-mmap c_regular */
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420 |
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421 |
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422 | /**
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423 | * Compares two open files.
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424 | */
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425 | int
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426 | cmp_fd_and_fd_ex(int fd1, const char *file1, off_t skip1,
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427 | int fd2, const char *file2, off_t skip2,
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428 | int sflag, int lflag, int special)
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429 | {
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430 | struct stat st1, st2;
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431 | int rc;
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432 |
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433 | if (fstat(fd1, &st1))
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434 | return err(ERR_EXIT, "%s", file1);
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435 | if (fstat(fd2, &st2))
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436 | return err(ERR_EXIT, "%s", file2);
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437 |
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438 | if ( !S_ISREG(st1.st_mode)
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439 | || !S_ISREG(st2.st_mode)
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440 | || special)
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441 | rc = c_special(fd1, file1, skip1,
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442 | fd2, file2, skip2, sflag, lflag);
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443 | else
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444 | rc = c_regular(fd1, file1, skip1, st1.st_size,
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445 | fd2, file2, skip2, st2.st_size, sflag, lflag);
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446 | return rc;
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447 | }
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448 |
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449 |
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450 | /**
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451 | * Compares two open files.
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452 | */
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453 | int
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454 | cmp_fd_and_fd(int fd1, const char *file1,
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455 | int fd2, const char *file2,
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456 | int sflag, int lflag, int special)
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457 | {
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458 | return cmp_fd_and_fd_ex(fd1, file1, 0, fd2, file2, 0, sflag, lflag, special);
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459 | }
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460 |
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461 |
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462 | /**
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463 | * Compares an open file with another that isn't open yet.
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464 | */
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465 | int
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466 | cmp_fd_and_file_ex(int fd1, const char *file1, off_t skip1,
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467 | const char *file2, off_t skip2,
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---|
468 | int sflag, int lflag, int special)
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469 | {
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470 | int rc;
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471 | int fd2;
|
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472 |
|
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473 | if (!strcmp(file2, "-"))
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474 | {
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475 | fd2 = 0 /* stdin */;
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476 | special = 1;
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477 | file2 = "stdin";
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478 | }
|
---|
479 | else
|
---|
480 | fd2 = open(file2, O_RDONLY | O_BINARY, 0);
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481 | if (fd2 >= 0)
|
---|
482 | {
|
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483 | rc = cmp_fd_and_fd_ex(fd1, file1, skip1,
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484 | fd2, file2, skip2, sflag, lflag, special);
|
---|
485 | close(fd2);
|
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486 | }
|
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487 | else
|
---|
488 | {
|
---|
489 | if (!sflag)
|
---|
490 | warn("%s", file2);
|
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491 | rc = ERR_EXIT;
|
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492 | }
|
---|
493 | return rc;
|
---|
494 | }
|
---|
495 |
|
---|
496 |
|
---|
497 | /**
|
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498 | * Compares an open file with another that isn't open yet.
|
---|
499 | */
|
---|
500 | int
|
---|
501 | cmp_fd_and_file(int fd1, const char *file1,
|
---|
502 | const char *file2,
|
---|
503 | int sflag, int lflag, int special)
|
---|
504 | {
|
---|
505 | return cmp_fd_and_file_ex(fd1, file1, 0,
|
---|
506 | file2, 0, sflag, lflag, special);
|
---|
507 | }
|
---|
508 |
|
---|
509 |
|
---|
510 | /**
|
---|
511 | * Opens and compare two files.
|
---|
512 | */
|
---|
513 | int
|
---|
514 | cmp_file_and_file_ex(const char *file1, off_t skip1,
|
---|
515 | const char *file2, off_t skip2,
|
---|
516 | int sflag, int lflag, int special)
|
---|
517 | {
|
---|
518 | int fd1;
|
---|
519 | int rc;
|
---|
520 |
|
---|
521 | if (lflag && sflag)
|
---|
522 | return errx(ERR_EXIT, "only one of -l and -s may be specified");
|
---|
523 |
|
---|
524 | if (!strcmp(file1, "-"))
|
---|
525 | {
|
---|
526 | if (!strcmp(file2, "-"))
|
---|
527 | return errx(ERR_EXIT, "standard input may only be specified once");
|
---|
528 | file1 = "stdin";
|
---|
529 | fd1 = 1;
|
---|
530 | special = 1;
|
---|
531 | }
|
---|
532 | else
|
---|
533 | fd1 = open(file1, O_RDONLY | O_BINARY, 0);
|
---|
534 | if (fd1 >= 0)
|
---|
535 | {
|
---|
536 | rc = cmp_fd_and_file_ex(fd1, file1, skip1,
|
---|
537 | file2, skip2, sflag, lflag, special);
|
---|
538 | close(fd1);
|
---|
539 | }
|
---|
540 | else
|
---|
541 | {
|
---|
542 | if (!sflag)
|
---|
543 | warn("%s", file1);
|
---|
544 | rc = ERR_EXIT;
|
---|
545 | }
|
---|
546 |
|
---|
547 | return rc;
|
---|
548 | }
|
---|
549 |
|
---|
550 |
|
---|
551 | /**
|
---|
552 | * Opens and compare two files.
|
---|
553 | */
|
---|
554 | int
|
---|
555 | cmp_file_and_file(const char *file1, const char *file2, int sflag, int lflag, int special)
|
---|
556 | {
|
---|
557 | return cmp_file_and_file_ex(file1, 0, file2, 0, sflag, lflag, special);
|
---|
558 | }
|
---|
559 |
|
---|