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339
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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 #include <config.h>
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23
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24 #include <errno.h>
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25 #include <stdio.h>
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26 #include <stdlib.h>
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27 #include <string.h>
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28
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29 #include "lwar.h"
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30
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31 void do_replace(void)
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32 {
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33 FILE *f;
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34 FILE *nf;
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35 unsigned char buf[8];
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36 long l;
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37 int c;
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38 FILE *f2;
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39 int i;
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40 char fnbuf[1024];
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41 char fnbuf2[1024];
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42
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43 sprintf(fnbuf, "%s.tmp", archive_file);
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44
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45 f = fopen(archive_file, "r+");
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46 if (!f)
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47 {
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48 if (errno == ENOENT)
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49 {
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50 nf = fopen(fnbuf, "w");
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51 if (nf)
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52 {
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53 fputs("LWAR1V", nf);
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54 goto doadd;
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55 }
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56 }
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57 perror("Cannot open archive file");
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58 }
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59
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60 fread(buf, 1, 6, f);
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61 if (memcmp("LWAR1V", buf, 6))
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62 {
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63 fprintf(stderr, "%s is not a valid archive file.\n", archive_file);
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64 exit(1);
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65 }
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66
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67 nf = fopen(fnbuf, "w");
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68 if (!nf)
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69 {
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70 perror("Cannot create temp archive file");
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71 exit(1);
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72 }
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73
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74 fputs("LWAR1V", nf);
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75
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76 for (;;)
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77 {
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78 c = fgetc(f);
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79 if (c == EOF && ferror(f))
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80 {
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81 perror("Reading archive file");
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82 exit(1);
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83 }
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84 if (c == EOF)
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85 goto doadd;
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86
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87 if (!c)
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88 {
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89 goto doadd;
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90 }
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91
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92 // find the end of the file name
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93 i = 0;
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94 while (c)
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95 {
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96 fnbuf2[i++] = c;
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97 c = fgetc(f);
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98 if (c == EOF || ferror(f))
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99 {
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100 fprintf(stderr, "Bad archive file\n");
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101 exit(1);
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102 }
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103 }
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104 fnbuf2[i] = 0;
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105
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106 // get length of archive member
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107 l = 0;
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108 c = fgetc(f);
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109 l = c << 24;
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110 c = fgetc(f);
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111 l |= c << 16;
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112 c = fgetc(f);
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113 l |= c << 8;
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114 c = fgetc(f);
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115 l |= c;
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116
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117 // is it a file we are replacing? if so, do not copy it
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118 for (i = 0; i < nfiles; i++)
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119 {
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120 if (!strcmp(files[i], fnbuf2))
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121 break;
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122 }
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123 if (i < nfiles)
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124 {
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125 fseek(f, l, SEEK_CUR);
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126 }
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127 else
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128 {
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129 // otherwise, copy it
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130 fprintf(nf, "%s", fnbuf2);
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131 fputc(0, nf);
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132 fputc(l >> 24, nf);
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133 fputc((l >> 16) & 0xff, nf);
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134 fputc((l >> 8) & 0xff, nf);
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135 fputc(l & 0xff, nf);
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136 while (l)
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137 {
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138 c = fgetc(f);
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139 fputc(c, nf);
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140 l--;
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141 }
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142 }
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143 }
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144
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145 // done with the original file
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146 fclose(f);
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147 doadd:
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148 for (i = 0; i < nfiles; i++)
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149 {
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150 f2 = fopen(files[i], "r");
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151 if (!f2)
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152 {
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153 fprintf(stderr, "Cannot open file %s:", files[i]);
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154 perror("");
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155 exit(1);
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156 }
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157 fread(buf, 1, 6, f2);
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158 if (mergeflag && !memcmp("LWAR1V", buf, 6))
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159 {
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160 // add archive contents...
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161 for (;;)
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162 {
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163 c = fgetc(f2);
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164 if (c == EOF || ferror(f2))
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165 {
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166 perror("Reading input archive file");
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167 exit(1);
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168 }
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169 if (c == EOF)
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170 break;
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171
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172 if (!c)
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173 {
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174 break;
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175 }
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176
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177 // find the end of the file name
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178 while (c)
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179 {
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180 fputc(c, nf);
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181 c = fgetc(f2);
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182 if (c == EOF || ferror(f))
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183 {
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184 fprintf(stderr, "Bad input archive file\n");
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185 exit(1);
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186 }
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187 }
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188 fputc(0, nf);
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189
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190 // get length of archive member
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191 l = 0;
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192 c = fgetc(f2);
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193 fputc(c, nf);
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194 l = c << 24;
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195 c = fgetc(f2);
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196 fputc(c, nf);
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197 l |= c << 16;
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198 c = fgetc(f2);
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199 fputc(c, nf);
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200 l |= c << 8;
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201 c = fgetc(f2);
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202 fputc(c, nf);
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203 l |= c;
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204
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205 while (l)
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206 {
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207 c = fgetc(f2);
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208 fputc(c, nf);
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209 l--;
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210 }
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211 }
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212
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213 fclose(f2);
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214 continue;
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215 }
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216 fseek(f2, 0, SEEK_END);
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217 l = ftell(f2);
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218 fseek(f2, 0, SEEK_SET);
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219 fputs(files[i], nf);
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220 fputc(0, nf);
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221 fputc(l >> 24, nf);
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222 fputc((l >> 16) & 0xff, nf);
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223 fputc((l >> 8) & 0xff, nf);
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224 fputc(l & 0xff, nf);
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225 while (l)
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226 {
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227 c = fgetc(f2);
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228 fputc(c, nf);
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229 l--;
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230 }
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231 }
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232
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233 // flag end of file
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234 fputc(0, nf);
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235
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236 fclose(nf);
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237
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238 if (rename(fnbuf, archive_file) < 0)
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239 {
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240 perror("Cannot replace old archive file");
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241 unlink(fnbuf);
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242 }
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243 }
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