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339
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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 #include <config.h>
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26
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27 #include <errno.h>
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28 #include <stdio.h>
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29 #include <stdlib.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_add(void)
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34 {
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35 FILE *f;
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36 unsigned char buf[8];
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37 long l;
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38 int c;
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39 FILE *f2;
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40 int i;
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41
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42 f = fopen(archive_file, "r+");
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43 if (!f)
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44 {
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45 if (errno == ENOENT)
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46 {
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47 f = fopen(archive_file, "w");
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48 if (f)
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49 {
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50 fputs("LWAR1V", f);
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51 goto doadd;
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52 }
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53 }
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54 perror("Cannot open archive file");
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55 }
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56
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57 fread(buf, 1, 6, f);
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58 if (memcmp("LWAR1V", buf, 6))
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59 {
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60 fprintf(stderr, "%s is not a valid archive file.\n", archive_file);
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61 exit(1);
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62 }
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63
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64 for (;;)
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65 {
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66 c = fgetc(f);
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67 if (c == EOF && ferror(f))
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68 {
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69 perror("Reading archive file");
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70 exit(1);
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71 }
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72 if (c == EOF)
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73 goto doadd;
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74
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75 if (!c)
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76 {
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77 fseek(f, -1, SEEK_CUR);
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78 goto doadd;
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79 }
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80
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81 // find the end of the file name
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82 while (c)
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83 {
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84 c = fgetc(f);
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85 if (c == EOF || ferror(f))
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86 {
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87 fprintf(stderr, "Bad archive file\n");
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88 exit(1);
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89 }
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90 }
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91
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92 // get length of archive member
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93 l = 0;
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94 c = fgetc(f);
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95 l = c << 24;
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96 c = fgetc(f);
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97 l |= c << 16;
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98 c = fgetc(f);
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99 l |= c << 8;
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100 c = fgetc(f);
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101 l |= c;
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102
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103 fseek(f, l, SEEK_CUR);
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104 }
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105 // back up to the NUL byte at the end of the file
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106 fseek(f, -1, SEEK_CUR);
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107 doadd:
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108 for (i = 0; i < nfiles; i++)
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109 {
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110 f2 = fopen(files[i], "r");
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111 if (!f2)
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112 {
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113 fprintf(stderr, "Cannot open file %s:", files[i]);
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114 perror("");
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115 exit(1);
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116 }
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117 fread(buf, 1, 6, f2);
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118 if (mergeflag && !memcmp("LWAR1V", buf, 6))
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119 {
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120 // add archive contents...
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121 for (;;)
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122 {
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123 c = fgetc(f2);
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124 if (c == EOF || ferror(f2))
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125 {
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126 perror("Reading input archive file");
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127 exit(1);
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128 }
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129 if (c == EOF)
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130 break;
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131
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132 if (!c)
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133 {
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134 break;
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135 }
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136
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137 // find the end of the file name
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138 while (c)
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139 {
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140 fputc(c, f);
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141 c = fgetc(f2);
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142 if (c == EOF || ferror(f))
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143 {
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144 fprintf(stderr, "Bad input archive file\n");
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145 exit(1);
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146 }
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147 }
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148 fputc(0, f);
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149
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150 // get length of archive member
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151 l = 0;
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152 c = fgetc(f2);
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153 fputc(c, f);
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154 l = c << 24;
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155 c = fgetc(f2);
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156 fputc(c, f);
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157 l |= c << 16;
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158 c = fgetc(f2);
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159 fputc(c, f);
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160 l |= c << 8;
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161 c = fgetc(f2);
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162 fputc(c, f);
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163 l |= c;
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164
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165 while (l)
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166 {
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167 c = fgetc(f2);
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168 fputc(c, f);
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169 l--;
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170 }
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171 }
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172
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173 fclose(f2);
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174 continue;
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175 }
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176 fseek(f2, 0, SEEK_END);
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177 l = ftell(f2);
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178 fseek(f2, 0, SEEK_SET);
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179 fputs(files[i], f);
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180 fputc(0, f);
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181 fputc(l >> 24, f);
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182 fputc((l >> 16) & 0xff, f);
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183 fputc((l >> 8) & 0xff, f);
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184 fputc(l & 0xff, f);
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185 while (l)
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186 {
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187 c = fgetc(f2);
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188 fputc(c, f);
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189 l--;
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190 }
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191 }
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192
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193 // flag end of file
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194 fputc(0, f);
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195 }
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