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172
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1 /*
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2 add.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 Implements the program startup code
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22
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23 */
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24
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25 #ifdef HAVE_CONFIG_H
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26 #include "config.h"
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27 #endif
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28
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29 #include <errno.h>
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30 #include <stdio.h>
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31 #include <stdlib.h>
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32
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33 #include "lwar.h"
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34
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35 void do_add(void)
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36 {
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37 FILE *f;
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38 unsigned char buf[8];
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39 long l;
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40 int c;
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41 FILE *f2;
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42 int i;
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43
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44 f = fopen(archive_file, "r+");
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45 if (!f)
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46 {
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47 if (errno == ENOENT)
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48 {
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49 f = fopen(archive_file, "w");
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50 if (f)
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51 {
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52 fputs("LWAR1V", f);
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53 goto doadd;
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54 }
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55 }
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56 perror("Cannot open archive file");
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57 }
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58
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59 fread(buf, 1, 6, f);
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60 if (memcmp("LWAR1V", buf, 6))
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61 {
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62 fprintf(stderr, "%s is not a valid archive file.\n", archive_file);
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63 exit(1);
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64 }
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65
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66 for (;;)
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67 {
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68 c = fgetc(f);
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69 if (c == EOF && ferror(f))
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70 {
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71 perror("Reading archive file");
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72 exit(1);
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73 }
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74 if (c == EOF)
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75 goto doadd;
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76
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77 if (!c)
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78 {
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79 fseek(f, -1, SEEK_CUR);
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80 goto doadd;
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81 }
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82
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83 // find the end of the file name
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84 while (c)
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85 {
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86 c = fgetc(f);
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87 if (c == EOF || ferror(f))
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88 {
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89 fprintf(stderr, "Bad archive file\n");
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90 exit(1);
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91 }
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92 }
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93
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94 // get length of archive member
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95 l = 0;
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96 c = fgetc(f);
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97 l = c << 24;
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98 c = fgetc(f);
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99 l |= c << 16;
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100 c = fgetc(f);
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101 l |= c << 8;
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102 c = fgetc(f);
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103 l |= c;
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104
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105 fseek(f, l, SEEK_CUR);
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106 }
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107 // back up to the NUL byte at the end of the file
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108 fseek(f, -1, SEEK_CUR);
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109 doadd:
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110 for (i = 0; i < nfiles; i++)
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111 {
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112 f2 = fopen(files[i], "r");
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113 if (!f2)
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114 {
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115 fprintf(stderr, "Cannot open file %s:", files[i]);
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116 perror("");
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117 exit(1);
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118 }
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174
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119 fread(buf, 1, 6, f2);
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120 if (mergeflag && !memcmp("LWAR1V", buf, 6))
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121 {
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122 // add archive contents...
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123 for (;;)
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124 {
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125 c = fgetc(f2);
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126 if (c == EOF || ferror(f2))
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127 {
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128 perror("Reading input archive file");
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129 exit(1);
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130 }
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131 if (c == EOF)
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132 break;
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133
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134 if (!c)
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135 {
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136 break;
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137 }
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138
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139 // find the end of the file name
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140 while (c)
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141 {
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142 fputc(c, f);
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143 c = fgetc(f2);
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144 if (c == EOF || ferror(f))
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145 {
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146 fprintf(stderr, "Bad input archive file\n");
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147 exit(1);
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148 }
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149 }
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150 fputc(0, f);
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151
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152 // get length of archive member
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153 l = 0;
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154 c = fgetc(f2);
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155 fputc(c, f);
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156 l = c << 24;
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157 c = fgetc(f2);
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158 fputc(c, f);
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159 l |= c << 16;
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160 c = fgetc(f2);
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161 fputc(c, f);
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162 l |= c << 8;
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163 c = fgetc(f2);
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164 fputc(c, f);
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165 l |= c;
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166
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167 while (l)
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168 {
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169 c = fgetc(f2);
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170 fputc(c, f);
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171 l--;
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172 }
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173 }
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174
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175 fclose(f2);
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176 continue;
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177 }
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172
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178 fseek(f2, 0, SEEK_END);
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179 l = ftell(f2);
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180 fseek(f2, 0, SEEK_SET);
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181 fputs(files[i], f);
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182 fputc(0, f);
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183 fputc(l >> 24, f);
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184 fputc((l >> 16) & 0xff, f);
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185 fputc((l >> 8) & 0xff, f);
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186 fputc(l & 0xff, f);
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187 while (l)
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188 {
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189 c = fgetc(f2);
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190 fputc(c, f);
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191 l--;
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192 }
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193 }
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194
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195 // flag end of file
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196 fputc(0, f);
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197 }
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