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188
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1 /*
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2 replace.c
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3 Copyright © 2009 William Astle
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4
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5 This file is part of LWAR.
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6
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7 LWAR is free software: you can redistribute it and/or modify it under the
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8 terms of the GNU General Public License as published by the Free Software
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9 Foundation, either version 3 of the License, or (at your option) any later
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10 version.
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11
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12 This program is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 more details.
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16
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17 You should have received a copy of the GNU General Public License along with
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18 this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 */
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21
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22 #ifdef HAVE_CONFIG_H
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23 #include "config.h"
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24 #endif
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25
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26 #include <errno.h>
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27 #include <stdio.h>
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28 #include <stdlib.h>
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29 #include <string.h>
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30
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31 #include "lwar.h"
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32
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33 void do_replace(void)
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34 {
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35 FILE *f;
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36 FILE *nf;
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37 unsigned char buf[8];
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38 long l;
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39 int c;
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40 FILE *f2;
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41 int i;
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42 char fnbuf[1024];
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43 char fnbuf2[1024];
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44
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45 sprintf(fnbuf, "%s.tmp", archive_file);
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46
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47 f = fopen(archive_file, "r+");
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48 if (!f)
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49 {
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50 if (errno == ENOENT)
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51 {
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52 nf = fopen(fnbuf, "w");
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53 if (nf)
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54 {
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55 fputs("LWAR1V", nf);
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56 goto doadd;
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57 }
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58 }
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59 perror("Cannot open archive file");
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60 }
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61
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62 fread(buf, 1, 6, f);
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63 if (memcmp("LWAR1V", buf, 6))
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64 {
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65 fprintf(stderr, "%s is not a valid archive file.\n", archive_file);
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66 exit(1);
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67 }
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68
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69 nf = fopen(fnbuf, "w");
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70 if (!nf)
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71 {
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72 perror("Cannot create temp archive file");
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73 exit(1);
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74 }
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75
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76 fputs("LWAR1V", nf);
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77
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78 for (;;)
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79 {
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80 c = fgetc(f);
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81 if (c == EOF && ferror(f))
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82 {
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83 perror("Reading archive file");
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84 exit(1);
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85 }
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86 if (c == EOF)
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87 goto doadd;
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88
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89 if (!c)
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90 {
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91 goto doadd;
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92 }
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93
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94 // find the end of the file name
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95 i = 0;
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96 while (c)
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97 {
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98 fnbuf2[i++] = c;
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99 c = fgetc(f);
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100 if (c == EOF || ferror(f))
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101 {
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102 fprintf(stderr, "Bad archive file\n");
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103 exit(1);
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104 }
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105 }
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106 fnbuf2[i] = 0;
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107
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108 // get length of archive member
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109 l = 0;
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110 c = fgetc(f);
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111 l = c << 24;
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112 c = fgetc(f);
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113 l |= c << 16;
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114 c = fgetc(f);
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115 l |= c << 8;
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116 c = fgetc(f);
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117 l |= c;
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118
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119 // is it a file we are replacing? if so, do not copy it
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120 for (i = 0; i < nfiles; i++)
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121 {
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122 if (!strcmp(files[i], fnbuf2))
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123 break;
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124 }
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125 if (i < nfiles)
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126 {
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127 fseek(f, l, SEEK_CUR);
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128 }
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129 else
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130 {
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131 // otherwise, copy it
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132 fprintf(nf, "%s", fnbuf2);
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133 fputc(0, nf);
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134 fputc(l >> 24, nf);
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135 fputc((l >> 16) & 0xff, nf);
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136 fputc((l >> 8) & 0xff, nf);
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137 fputc(l & 0xff, nf);
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138 while (l)
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139 {
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140 c = fgetc(f);
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141 fputc(c, nf);
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142 l--;
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143 }
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144 }
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145 }
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146
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147 // done with the original file
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148 fclose(f);
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149 doadd:
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150 for (i = 0; i < nfiles; i++)
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151 {
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152 f2 = fopen(files[i], "r");
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153 if (!f2)
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154 {
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155 fprintf(stderr, "Cannot open file %s:", files[i]);
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156 perror("");
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157 exit(1);
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158 }
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159 fread(buf, 1, 6, f2);
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160 if (mergeflag && !memcmp("LWAR1V", buf, 6))
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161 {
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162 // add archive contents...
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163 for (;;)
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164 {
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165 c = fgetc(f2);
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166 if (c == EOF || ferror(f2))
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167 {
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168 perror("Reading input archive file");
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169 exit(1);
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170 }
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171 if (c == EOF)
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172 break;
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173
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174 if (!c)
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175 {
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176 break;
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177 }
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178
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179 // find the end of the file name
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180 while (c)
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181 {
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182 fputc(c, nf);
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183 c = fgetc(f2);
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184 if (c == EOF || ferror(f))
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185 {
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186 fprintf(stderr, "Bad input archive file\n");
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187 exit(1);
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188 }
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189 }
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190 fputc(0, nf);
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191
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192 // get length of archive member
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193 l = 0;
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194 c = fgetc(f2);
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195 fputc(c, nf);
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196 l = c << 24;
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197 c = fgetc(f2);
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198 fputc(c, nf);
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199 l |= c << 16;
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200 c = fgetc(f2);
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201 fputc(c, nf);
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202 l |= c << 8;
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203 c = fgetc(f2);
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204 fputc(c, nf);
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205 l |= c;
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206
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207 while (l)
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208 {
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209 c = fgetc(f2);
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210 fputc(c, nf);
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211 l--;
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212 }
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213 }
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214
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215 fclose(f2);
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216 continue;
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217 }
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218 fseek(f2, 0, SEEK_END);
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219 l = ftell(f2);
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220 fseek(f2, 0, SEEK_SET);
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221 fputs(files[i], nf);
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222 fputc(0, nf);
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223 fputc(l >> 24, nf);
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224 fputc((l >> 16) & 0xff, nf);
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225 fputc((l >> 8) & 0xff, nf);
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226 fputc(l & 0xff, nf);
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227 while (l)
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228 {
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229 c = fgetc(f2);
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230 fputc(c, nf);
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231 l--;
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232 }
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233 }
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234
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235 // flag end of file
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236 fputc(0, nf);
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237
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238 fclose(nf);
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239
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240 if (rename(fnbuf, archive_file) < 0)
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241 {
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242 perror("Cannot replace old archive file");
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243 unlink(fnbuf);
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244 }
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245 }
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