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comparison old-trunk/lwar/replace.c @ 339:eb230fa7d28e

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Prepare for migration to hg
author lost
date Fri, 19 Mar 2010 02:54:14 +0000
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338:e7885b3ee266 339:eb230fa7d28e
1 /*
2 replace.c
3 Copyright © 2009 William Astle
4
5 This file is part of LWAR.
6
7 LWAR is free software: you can redistribute it and/or modify it under the
8 terms of the GNU General Public License as published by the Free Software
9 Foundation, either version 3 of the License, or (at your option) any later
10 version.
11
12 This program is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 more details.
16
17 You should have received a copy of the GNU General Public License along with
18 this program. If not, see <http://www.gnu.org/licenses/>.
19
20 */
21
22 #include <config.h>
23
24 #include <errno.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28
29 #include "lwar.h"
30
31 void do_replace(void)
32 {
33 FILE *f;
34 FILE *nf;
35 unsigned char buf[8];
36 long l;
37 int c;
38 FILE *f2;
39 int i;
40 char fnbuf[1024];
41 char fnbuf2[1024];
42
43 sprintf(fnbuf, "%s.tmp", archive_file);
44
45 f = fopen(archive_file, "r+");
46 if (!f)
47 {
48 if (errno == ENOENT)
49 {
50 nf = fopen(fnbuf, "w");
51 if (nf)
52 {
53 fputs("LWAR1V", nf);
54 goto doadd;
55 }
56 }
57 perror("Cannot open archive file");
58 }
59
60 fread(buf, 1, 6, f);
61 if (memcmp("LWAR1V", buf, 6))
62 {
63 fprintf(stderr, "%s is not a valid archive file.\n", archive_file);
64 exit(1);
65 }
66
67 nf = fopen(fnbuf, "w");
68 if (!nf)
69 {
70 perror("Cannot create temp archive file");
71 exit(1);
72 }
73
74 fputs("LWAR1V", nf);
75
76 for (;;)
77 {
78 c = fgetc(f);
79 if (c == EOF && ferror(f))
80 {
81 perror("Reading archive file");
82 exit(1);
83 }
84 if (c == EOF)
85 goto doadd;
86
87 if (!c)
88 {
89 goto doadd;
90 }
91
92 // find the end of the file name
93 i = 0;
94 while (c)
95 {
96 fnbuf2[i++] = c;
97 c = fgetc(f);
98 if (c == EOF || ferror(f))
99 {
100 fprintf(stderr, "Bad archive file\n");
101 exit(1);
102 }
103 }
104 fnbuf2[i] = 0;
105
106 // get length of archive member
107 l = 0;
108 c = fgetc(f);
109 l = c << 24;
110 c = fgetc(f);
111 l |= c << 16;
112 c = fgetc(f);
113 l |= c << 8;
114 c = fgetc(f);
115 l |= c;
116
117 // is it a file we are replacing? if so, do not copy it
118 for (i = 0; i < nfiles; i++)
119 {
120 if (!strcmp(files[i], fnbuf2))
121 break;
122 }
123 if (i < nfiles)
124 {
125 fseek(f, l, SEEK_CUR);
126 }
127 else
128 {
129 // otherwise, copy it
130 fprintf(nf, "%s", fnbuf2);
131 fputc(0, nf);
132 fputc(l >> 24, nf);
133 fputc((l >> 16) & 0xff, nf);
134 fputc((l >> 8) & 0xff, nf);
135 fputc(l & 0xff, nf);
136 while (l)
137 {
138 c = fgetc(f);
139 fputc(c, nf);
140 l--;
141 }
142 }
143 }
144
145 // done with the original file
146 fclose(f);
147 doadd:
148 for (i = 0; i < nfiles; i++)
149 {
150 f2 = fopen(files[i], "r");
151 if (!f2)
152 {
153 fprintf(stderr, "Cannot open file %s:", files[i]);
154 perror("");
155 exit(1);
156 }
157 fread(buf, 1, 6, f2);
158 if (mergeflag && !memcmp("LWAR1V", buf, 6))
159 {
160 // add archive contents...
161 for (;;)
162 {
163 c = fgetc(f2);
164 if (c == EOF || ferror(f2))
165 {
166 perror("Reading input archive file");
167 exit(1);
168 }
169 if (c == EOF)
170 break;
171
172 if (!c)
173 {
174 break;
175 }
176
177 // find the end of the file name
178 while (c)
179 {
180 fputc(c, nf);
181 c = fgetc(f2);
182 if (c == EOF || ferror(f))
183 {
184 fprintf(stderr, "Bad input archive file\n");
185 exit(1);
186 }
187 }
188 fputc(0, nf);
189
190 // get length of archive member
191 l = 0;
192 c = fgetc(f2);
193 fputc(c, nf);
194 l = c << 24;
195 c = fgetc(f2);
196 fputc(c, nf);
197 l |= c << 16;
198 c = fgetc(f2);
199 fputc(c, nf);
200 l |= c << 8;
201 c = fgetc(f2);
202 fputc(c, nf);
203 l |= c;
204
205 while (l)
206 {
207 c = fgetc(f2);
208 fputc(c, nf);
209 l--;
210 }
211 }
212
213 fclose(f2);
214 continue;
215 }
216 fseek(f2, 0, SEEK_END);
217 l = ftell(f2);
218 fseek(f2, 0, SEEK_SET);
219 fputs(files[i], nf);
220 fputc(0, nf);
221 fputc(l >> 24, nf);
222 fputc((l >> 16) & 0xff, nf);
223 fputc((l >> 8) & 0xff, nf);
224 fputc(l & 0xff, nf);
225 while (l)
226 {
227 c = fgetc(f2);
228 fputc(c, nf);
229 l--;
230 }
231 }
232
233 // flag end of file
234 fputc(0, nf);
235
236 fclose(nf);
237
238 if (rename(fnbuf, archive_file) < 0)
239 {
240 perror("Cannot replace old archive file");
241 unlink(fnbuf);
242 }
243 }