/
posix.c
424 lines (325 loc) · 10.2 KB
/
posix.c
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
423
/*
* Posix-esque support routines for PhysicsFS.
*
* Please see the file LICENSE.txt in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
#define __PHYSICSFS_INTERNAL__
#include "physfs_platforms.h"
#ifdef PHYSFS_PLATFORM_POSIX
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#ifdef PHYSFS_HAVE_LLSEEK
#include <linux/unistd.h>
#endif
#include "physfs_internal.h"
const char *__PHYSFS_platformDirSeparator = "/";
char *__PHYSFS_platformCopyEnvironmentVariable(const char *varname)
{
const char *envr = getenv(varname);
char *retval = NULL;
if (envr != NULL)
{
retval = (char *) allocator.Malloc(strlen(envr) + 1);
if (retval != NULL)
strcpy(retval, envr);
} /* if */
return(retval);
} /* __PHYSFS_platformCopyEnvironmentVariable */
static char *getUserNameByUID(void)
{
uid_t uid = getuid();
struct passwd *pw;
char *retval = NULL;
pw = getpwuid(uid);
if ((pw != NULL) && (pw->pw_name != NULL))
{
retval = (char *) allocator.Malloc(strlen(pw->pw_name) + 1);
if (retval != NULL)
strcpy(retval, pw->pw_name);
} /* if */
return(retval);
} /* getUserNameByUID */
static char *getUserDirByUID(void)
{
uid_t uid = getuid();
struct passwd *pw;
char *retval = NULL;
pw = getpwuid(uid);
if ((pw != NULL) && (pw->pw_dir != NULL))
{
retval = (char *) allocator.Malloc(strlen(pw->pw_dir) + 1);
if (retval != NULL)
strcpy(retval, pw->pw_dir);
} /* if */
return(retval);
} /* getUserDirByUID */
char *__PHYSFS_platformGetUserName(void)
{
char *retval = getUserNameByUID();
if (retval == NULL)
retval = __PHYSFS_platformCopyEnvironmentVariable("USER");
return(retval);
} /* __PHYSFS_platformGetUserName */
char *__PHYSFS_platformGetUserDir(void)
{
char *retval = __PHYSFS_platformCopyEnvironmentVariable("HOME");
/* if the environment variable was set, make sure it's really a dir. */
if (retval != NULL)
{
struct stat statbuf;
if ((stat(retval, &statbuf) == -1) || (S_ISDIR(statbuf.st_mode) == 0))
{
allocator.Free(retval);
retval = NULL;
} /* if */
} /* if */
if (retval == NULL)
retval = getUserDirByUID();
return(retval);
} /* __PHYSFS_platformGetUserDir */
int __PHYSFS_platformExists(const char *fname)
{
struct stat statbuf;
BAIL_IF_MACRO(lstat(fname, &statbuf) == -1, strerror(errno), 0);
return(1);
} /* __PHYSFS_platformExists */
int __PHYSFS_platformIsSymLink(const char *fname)
{
struct stat statbuf;
BAIL_IF_MACRO(lstat(fname, &statbuf) == -1, strerror(errno), 0);
return( (S_ISLNK(statbuf.st_mode)) ? 1 : 0 );
} /* __PHYSFS_platformIsSymlink */
int __PHYSFS_platformIsDirectory(const char *fname)
{
struct stat statbuf;
BAIL_IF_MACRO(stat(fname, &statbuf) == -1, strerror(errno), 0);
return( (S_ISDIR(statbuf.st_mode)) ? 1 : 0 );
} /* __PHYSFS_platformIsDirectory */
char *__PHYSFS_platformCvtToDependent(const char *prepend,
const char *dirName,
const char *append)
{
int len = ((prepend) ? strlen(prepend) : 0) +
((append) ? strlen(append) : 0) +
strlen(dirName) + 1;
char *retval = (char *) allocator.Malloc(len);
BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
/* platform-independent notation is Unix-style already. :) */
if (prepend)
strcpy(retval, prepend);
else
retval[0] = '\0';
strcat(retval, dirName);
if (append)
strcat(retval, append);
return(retval);
} /* __PHYSFS_platformCvtToDependent */
void __PHYSFS_platformEnumerateFiles(const char *dirname,
int omitSymLinks,
PHYSFS_EnumFilesCallback callback,
const char *origdir,
void *callbackdata)
{
DIR *dir;
struct dirent *ent;
int bufsize = 0;
char *buf = NULL;
int dlen = 0;
if (omitSymLinks) /* !!! FIXME: this malloc sucks. */
{
dlen = strlen(dirname);
bufsize = dlen + 256;
buf = (char *) allocator.Malloc(bufsize);
if (buf == NULL)
return;
strcpy(buf, dirname);
if (buf[dlen - 1] != '/')
{
buf[dlen++] = '/';
buf[dlen] = '\0';
} /* if */
} /* if */
errno = 0;
dir = opendir(dirname);
if (dir == NULL)
{
allocator.Free(buf);
return;
} /* if */
while ((ent = readdir(dir)) != NULL)
{
if (strcmp(ent->d_name, ".") == 0)
continue;
if (strcmp(ent->d_name, "..") == 0)
continue;
if (omitSymLinks)
{
char *p;
int len = strlen(ent->d_name) + dlen + 1;
if (len > bufsize)
{
p = (char *) allocator.Realloc(buf, len);
if (p == NULL)
continue;
buf = p;
bufsize = len;
} /* if */
strcpy(buf + dlen, ent->d_name);
if (__PHYSFS_platformIsSymLink(buf))
continue;
} /* if */
callback(callbackdata, origdir, ent->d_name);
} /* while */
allocator.Free(buf);
closedir(dir);
} /* __PHYSFS_platformEnumerateFiles */
int __PHYSFS_platformMkDir(const char *path)
{
int rc;
errno = 0;
rc = mkdir(path, S_IRWXU);
BAIL_IF_MACRO(rc == -1, strerror(errno), 0);
return(1);
} /* __PHYSFS_platformMkDir */
static void *doOpen(const char *filename, int mode)
{
const int appending = (mode & O_APPEND);
int fd;
int *retval;
errno = 0;
/* O_APPEND doesn't actually behave as we'd like. */
mode &= ~O_APPEND;
fd = open(filename, mode, S_IRUSR | S_IWUSR);
BAIL_IF_MACRO(fd < 0, strerror(errno), NULL);
if (appending)
{
if (lseek(fd, 0, SEEK_END) < 0)
{
close(fd);
BAIL_MACRO(strerror(errno), NULL);
} /* if */
} /* if */
retval = (int *) allocator.Malloc(sizeof (int));
if (retval == NULL)
{
close(fd);
BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
} /* if */
*retval = fd;
return((void *) retval);
} /* doOpen */
void *__PHYSFS_platformOpenRead(const char *filename)
{
return(doOpen(filename, O_RDONLY));
} /* __PHYSFS_platformOpenRead */
void *__PHYSFS_platformOpenWrite(const char *filename)
{
return(doOpen(filename, O_WRONLY | O_CREAT | O_TRUNC));
} /* __PHYSFS_platformOpenWrite */
void *__PHYSFS_platformOpenAppend(const char *filename)
{
return(doOpen(filename, O_WRONLY | O_CREAT | O_APPEND));
} /* __PHYSFS_platformOpenAppend */
PHYSFS_sint64 __PHYSFS_platformRead(void *opaque, void *buffer,
PHYSFS_uint32 size, PHYSFS_uint32 count)
{
int fd = *((int *) opaque);
int max = size * count;
int rc = read(fd, buffer, max);
BAIL_IF_MACRO(rc == -1, strerror(errno), rc);
assert(rc <= max);
if ((rc < max) && (size > 1))
lseek(fd, -(rc % size), SEEK_CUR); /* rollback to object boundary. */
return(rc / size);
} /* __PHYSFS_platformRead */
PHYSFS_sint64 __PHYSFS_platformWrite(void *opaque, const void *buffer,
PHYSFS_uint32 size, PHYSFS_uint32 count)
{
int fd = *((int *) opaque);
int max = size * count;
int rc = write(fd, (void *) buffer, max);
BAIL_IF_MACRO(rc == -1, strerror(errno), rc);
assert(rc <= max);
if ((rc < max) && (size > 1))
lseek(fd, -(rc % size), SEEK_CUR); /* rollback to object boundary. */
return(rc / size);
} /* __PHYSFS_platformWrite */
int __PHYSFS_platformSeek(void *opaque, PHYSFS_uint64 pos)
{
int fd = *((int *) opaque);
#ifdef PHYSFS_HAVE_LLSEEK
unsigned long offset_high = ((pos >> 32) & 0xFFFFFFFF);
unsigned long offset_low = (pos & 0xFFFFFFFF);
loff_t retoffset;
int rc = llseek(fd, offset_high, offset_low, &retoffset, SEEK_SET);
BAIL_IF_MACRO(rc == -1, strerror(errno), 0);
#else
BAIL_IF_MACRO(lseek(fd, (int) pos, SEEK_SET) == -1, strerror(errno), 0);
#endif
return(1);
} /* __PHYSFS_platformSeek */
PHYSFS_sint64 __PHYSFS_platformTell(void *opaque)
{
int fd = *((int *) opaque);
PHYSFS_sint64 retval;
#ifdef PHYSFS_HAVE_LLSEEK
loff_t retoffset;
int rc = llseek(fd, 0, &retoffset, SEEK_CUR);
BAIL_IF_MACRO(rc == -1, strerror(errno), -1);
retval = (PHYSFS_sint64) retoffset;
#else
retval = (PHYSFS_sint64) lseek(fd, 0, SEEK_CUR);
BAIL_IF_MACRO(retval == -1, strerror(errno), -1);
#endif
return(retval);
} /* __PHYSFS_platformTell */
PHYSFS_sint64 __PHYSFS_platformFileLength(void *opaque)
{
int fd = *((int *) opaque);
struct stat statbuf;
BAIL_IF_MACRO(fstat(fd, &statbuf) == -1, strerror(errno), -1);
return((PHYSFS_sint64) statbuf.st_size);
} /* __PHYSFS_platformFileLength */
int __PHYSFS_platformEOF(void *opaque)
{
PHYSFS_sint64 pos = __PHYSFS_platformTell(opaque);
PHYSFS_sint64 len = __PHYSFS_platformFileLength(opaque);
return((tell < 0) || (len < 0) || (pos >= len));
} /* __PHYSFS_platformEOF */
int __PHYSFS_platformFlush(void *opaque)
{
int fd = *((int *) opaque);
BAIL_IF_MACRO(fsync(fd) == -1, strerror(errno), 0);
return(1);
} /* __PHYSFS_platformFlush */
int __PHYSFS_platformClose(void *opaque)
{
int fd = *((int *) opaque);
BAIL_IF_MACRO(close(fd) == -1, strerror(errno), 0);
allocator.Free(opaque);
return(1);
} /* __PHYSFS_platformClose */
int __PHYSFS_platformDelete(const char *path)
{
BAIL_IF_MACRO(remove(path) == -1, strerror(errno), 0);
return(1);
} /* __PHYSFS_platformDelete */
PHYSFS_sint64 __PHYSFS_platformGetLastModTime(const char *fname)
{
struct stat statbuf;
BAIL_IF_MACRO(stat(fname, &statbuf) < 0, strerror(errno), -1);
return statbuf.st_mtime;
} /* __PHYSFS_platformGetLastModTime */
#endif /* PHYSFS_PLATFORM_POSIX */
/* end of posix.c ... */