summaryrefslogtreecommitdiffstats
path: root/Utilities/cmtar/libtar.c
blob: e9a14d8de20e738251c3c7b869c9078af5be7a28 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
/*
**  Copyright 1998-2003 University of Illinois Board of Trustees
**  Copyright 1998-2003 Mark D. Roth
**  All rights reserved.
**
**  libtar.c - demo driver program for libtar
**
**  Mark D. Roth <roth@uiuc.edu>
**  Campus Information Technologies and Educational Services
**  University of Illinois at Urbana-Champaign
*/
#include <libtar/config.h>
#include <libtar/libtar.h>

#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#if defined(_WIN32) && !defined(__CYGWIN__)
#include <libtar/compat.h>
#include <io.h>
#else
#include <sys/param.h>
#endif

#ifdef STDC_HEADERS
# include <string.h>
#endif

#ifdef HAVE_UNISTD_H
# include <unistd.h>
# include <stdlib.h>
#endif

#ifdef DEBUG
# include <signal.h>
#endif

#include CMTAR_ZLIB_HEADER

#include <libtar/compat.h>


char *progname;
int verbose = 0;
int use_gnu = 0;

#ifdef DEBUG
void
segv_handler(int sig)
{
  puts("OOPS!  Caught SIGSEGV, bailing out...");
  fflush(stdout);
  fflush(stderr);
}
#endif


#ifdef HAVE_LIBZ

int use_zlib = 0;

struct gzStruct
{
  gzFile* GZFile;
};
struct gzStruct GZStruct;
#if defined ( _MSC_VER) || defined(__WATCOMC__)
#include <io.h>
//Yogi: hack. this should work on windows where there is no O_ACCMODE defined
#ifndef O_ACCMODE
# define O_ACCMODE 0x0003
#endif
#endif

static int libtar_gzopen(void* call_data, const char *pathname,
  int oflags, mode_t mode)
{
  char *gzoflags;
  int fd;
  struct gzStruct* gzf = (struct gzStruct*)call_data;

  switch (oflags & O_ACCMODE)
  {
  case O_WRONLY:
    gzoflags = "wb";
    break;
  case O_RDONLY:
    gzoflags = "rb";
    break;
  default:
  case O_RDWR:
    errno = EINVAL;
    return -1;
  }

  fd = open(pathname, oflags, mode);
  if (fd == -1)
    {
    return -1;
    }

#if defined(__BEOS__) && !defined(__ZETA__)  /* no fchmod on BeOS...do pathname instead. */
  if ((oflags & O_CREAT) && chmod(pathname, mode & 07777))
    {
    return -1;
    }
#elif !defined(_WIN32) || defined(__CYGWIN__)
  if ((oflags & O_CREAT) && fchmod(fd, mode & 07777))
    {
    return -1;
    }
#endif

  gzf->GZFile = gzdopen(fd, gzoflags);
  if (!gzf->GZFile)
  {
    errno = ENOMEM;
    return -1;
  }

  return fd;
}

static int libtar_gzclose(void* call_data)
{
  struct gzStruct* gzf = (struct gzStruct*)call_data;
  return gzclose(gzf->GZFile);
}

static ssize_t libtar_gzread(void* call_data, void* buf, size_t count)
{
  struct gzStruct* gzf = (struct gzStruct*)call_data;
  return gzread(gzf->GZFile, buf, count);
}

static ssize_t libtar_gzwrite(void* call_data, const void* buf, size_t count)
{
  struct gzStruct* gzf = (struct gzStruct*)call_data;
  return gzwrite(gzf->GZFile, (void*)buf, count);
}

tartype_t gztype = { 
  libtar_gzopen,
  libtar_gzclose,
  libtar_gzread,
  libtar_gzwrite,
  &GZStruct
};

#endif /* HAVE_LIBZ */


static int
create(char *tarfile, char *rootdir, libtar_list_t *l)
{
  TAR *t;
  char *pathname;
  char buf[TAR_MAXPATHLEN];
  libtar_listptr_t lp;

  if (tar_open(&t, tarfile,
#ifdef HAVE_LIBZ
         (use_zlib ? &gztype : NULL),
#else
         NULL,
#endif
         O_WRONLY | O_CREAT, 0644,
         (verbose ? TAR_VERBOSE : 0)
         | (use_gnu ? TAR_GNU : 0)) == -1)
  {
    fprintf(stderr, "tar_open(): %s\n", strerror(errno));
    return -1;
  }

  libtar_listptr_reset(&lp);
  while (libtar_list_next(l, &lp) != 0)
  {
    pathname = (char *)libtar_listptr_data(&lp);
    if (pathname[0] != '/' && rootdir != NULL)
      snprintf(buf, sizeof(buf), "%s/%s", rootdir, pathname);
    else
      strlcpy(buf, pathname, sizeof(buf));
    if (tar_append_tree(t, buf, pathname) != 0)
    {
      fprintf(stderr,
        "tar_append_tree(\"%s\", \"%s\"): %s\n", buf,
        pathname, strerror(errno));
      tar_close(t);
      return -1;
    }
  }

  if (tar_append_eof(t) != 0)
  {
    fprintf(stderr, "tar_append_eof(): %s\n", strerror(errno));
    tar_close(t);
    return -1;
  }

  if (tar_close(t) != 0)
  {
    fprintf(stderr, "tar_close(): %s\n", strerror(errno));
    return -1;
  }

  return 0;
}


static int
list(char *tarfile)
{
  TAR *t;
  int i;

  if (tar_open(&t, tarfile,
#ifdef HAVE_LIBZ
         (use_zlib ? &gztype : NULL),
#else
         NULL,
#endif
         O_RDONLY, 0,
         (verbose ? TAR_VERBOSE : 0)
         | (use_gnu ? TAR_GNU : 0)) == -1)
  {
    fprintf(stderr, "tar_open(): %s\n", strerror(errno));
    return -1;
  }

  while ((i = th_read(t)) == 0)
  {
    th_print_long_ls(t);
#ifdef DEBUG
    th_print(t);
#endif
    if (TH_ISREG(t) && tar_skip_regfile(t) != 0)
    {
      fprintf(stderr, "tar_skip_regfile(): %s\n",
        strerror(errno));
      return -1;
    }
  }

#ifdef DEBUG
  printf("th_read() returned %d\n", i);
  printf("EOF mark encountered after %ld bytes\n",
# ifdef HAVE_LIBZ
         (use_zlib
    ? gzseek((gzFile) t->fd, 0, SEEK_CUR)
    :
# endif
         lseek(t->fd, 0, SEEK_CUR)
# ifdef HAVE_LIBZ
         )
# endif
         );
#endif

  if (tar_close(t) != 0)
  {
    fprintf(stderr, "tar_close(): %s\n", strerror(errno));
    return -1;
  }
  (void)i;

  return 0;
}


static int
extract(char *tarfile, char *rootdir)
{
  TAR *t;

#ifdef DEBUG
  puts("opening tarfile...");
#endif
  if (tar_open(&t, tarfile,
#ifdef HAVE_LIBZ
         (use_zlib ? &gztype : NULL),
#else
         NULL,
#endif
         O_RDONLY, 0,
         (verbose ? TAR_VERBOSE : 0)
         | (use_gnu ? TAR_GNU : 0)) == -1)
  {
    fprintf(stderr, "tar_open(): %s\n", strerror(errno));
    return -1;
  }

#ifdef DEBUG
  puts("extracting tarfile...");
#endif
  if (tar_extract_all(t, rootdir) != 0)
  {
    fprintf(stderr, "tar_extract_all(): %s\n", strerror(errno));
    return -1;
  }

#ifdef DEBUG
  puts("closing tarfile...");
#endif
  if (tar_close(t) != 0)
  {
    fprintf(stderr, "tar_close(): %s\n", strerror(errno));
    return -1;
  }

  return 0;
}


static void
usage()
{
  printf("Usage: %s [-C rootdir] [-g] [-z] -x|-t filename.tar\n",
         progname);
  printf("       %s [-C rootdir] [-g] [-z] -c filename.tar ...\n",
         progname);
  exit(-1);
}


#define MODE_LIST  1
#define MODE_CREATE  2
#define MODE_EXTRACT  3

int
main(int argc, char *argv[])
{
  char* tarfile;
  char *rootdir = NULL;
  int c;
  int mode;
  libtar_list_t *l;
#if defined(_WIN32) && !defined(__CYGWIN__)
   int optind;
#endif
  progname = basename(argv[0]);

#if !defined(_WIN32) || defined(__CYGWIN__)
  mode = 0;
  while ((c = getopt(argc, argv, "cC:gtvVxz")) != -1)
    switch (c)
    {
    case 'V':
      printf("libtar %s by Mark D. Roth <roth@uiuc.edu>\n",
             libtar_version);
      break;
    case 'C':
      rootdir = strdup(optarg);
      break;
    case 'v':
      verbose = 1;
      break;
    case 'g':
      use_gnu = 1;
      break;
    case 'c':
      if (mode)
        usage();
      mode = MODE_CREATE;
      break;
    case 'x':
      if (mode)
        usage();
      mode = MODE_EXTRACT;
      break;
    case 't':
      if (mode)
        usage();
      mode = MODE_LIST;
      break;
#ifdef HAVE_LIBZ
    case 'z':
      use_zlib = 1;
      break;
#endif /* HAVE_LIBZ */
    default:
      usage();
    }
  if (!mode || ((argc - optind) < (mode == MODE_CREATE ? 2 : 1)))
  {
#ifdef DEBUG
    printf("argc - optind == %d\tmode == %d\n", argc - optind,
           mode);
#endif
    usage();
  }

#else
  mode = MODE_EXTRACT;
  use_zlib=1;
  optind = 1;
#endif

#ifdef DEBUG
  signal(SIGSEGV, segv_handler);
#endif

  switch (mode)
  {
  case MODE_EXTRACT:
    return extract(argv[optind], rootdir);
  case MODE_CREATE:
    tarfile = argv[optind];
    l = libtar_list_new(LIST_QUEUE, NULL);
    for (c = optind + 1; c < argc; c++)
      libtar_list_add(l, argv[c]);
    return create(tarfile, rootdir, l);
  case MODE_LIST:
    return list(argv[optind]);
  default:
    break;
  }

  /* NOTREACHED */
  return -2;
}