-
Notifications
You must be signed in to change notification settings - Fork 1
/
utils.c
486 lines (425 loc) · 9.77 KB
/
utils.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
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
/*-------------------------------------------------------------------------
*
* utils.c:
*
* Copyright (c) 2009-2011, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
*
*-------------------------------------------------------------------------
*/
#include "pg_rman.h"
#include <dirent.h>
#include <time.h>
#include <limits.h>
#ifdef WIN32
#include <winioctl.h>
#endif
/*
* Convert time_t value to ISO-8601 format string.
* The size of buffer must be larger than DATESTRLEN.
*/
char *
date2str(char *buf, time_t date)
{
struct tm *tm = localtime(&date);
strftime(buf, DATESTRLEN, "%Y-%m-%d %H:%M:%S", tm);
return buf;
}
/*
* The size of buffer must be larger than TIMESTRLEN.
*/
char *
time2str(char *buf, time_t time)
{
/* set empty if nagative duration */
if (time < 0)
buf[0] = '\0';
else if (time >= 100 * 24 * 60 * 60)
snprintf(buf, TIMESTRLEN, "%.1fd", time / 86400.0);
else if (time >= 60 * 60)
snprintf(buf, TIMESTRLEN, "%.1fh", time / 3600.0);
else if (time >= 60)
snprintf(buf, TIMESTRLEN, "%.1fm", time / 60.0);
else
snprintf(buf, TIMESTRLEN, "%lds", (long) time);
return buf;
}
/*
* The size of buffer must be larger than SIZESTRLEN.
*/
char *
size2str(char *buf, int64 size)
{
int exp;
int64 base;
double n;
static const char *units[] = { "B ", "KB", "MB", "GB", "TB", "PB" };
/* set empty if nagative size */
if (size < 0)
{
buf[0] = '\0';
return buf;
}
/* determine the unit */
for (exp = 0, base = 1;
exp < lengthof(units) && base * 1024 < size;
++exp, base *= 1024)
;
n = size / (double) base;
if (n >= 100.0)
snprintf(buf, SIZESTRLEN, "%4.0f%s", n, units[exp]);
else if (n >= 10.0)
snprintf(buf, SIZESTRLEN, "%3.1f%s", n, units[exp]);
else
snprintf(buf, SIZESTRLEN, "%3.2f%s", n, units[exp]);
return buf;
}
/*
* Parse for backup mode. empty input is treated as full.
*/
BackupMode
parse_backup_mode(const char *value)
{
const char *v = value;
size_t len;
if (v == NULL)
return MODE_FULL; /* null input is full. */
while (IsSpace(*v)) { v++; }
if ((len = strlen(v)) == 0)
return MODE_FULL; /* empty input is full. */
/* Do a prefix match. For example, "incr" means incremental. */
if (pg_strncasecmp("full", v, len) == 0)
return MODE_FULL;
else if (pg_strncasecmp("incremental", v, len) == 0)
return MODE_INCREMENTAL;
else if (pg_strncasecmp("archive", v, len) == 0)
return MODE_ARCHIVE;
ereport(ERROR,
(errcode(EINVAL),
errmsg("invalid backup mode: '%s'", value)));
return (BackupMode) -1;
}
XLogName
parse_xlogname(const char *value)
{
XLogName xlog;
char junk[2];
if (sscanf(value, "%08X%08X%08X%1s",
&xlog.tli, &xlog.log, &xlog.seg, junk) != 3)
ereport(ERROR,
(errcode(EINVAL),
errmsg("invalid xlog name: '%s'", value)));
return xlog;
}
/* return max value of time_t */
time_t
time_max(void)
{
static time_t value = 0;
if (value == 0)
{
if (sizeof(time_t) > sizeof(int32))
{
struct tm tm = { 0 };
/* '9999-12-31 23:59:59' for 64bit time_t */
tm.tm_year = 9999 - 1900;
tm.tm_mon = 12 - 1;
tm.tm_mday = 31;
tm.tm_hour = 23;
tm.tm_min = 59;
tm.tm_sec = 59;
value = mktime(&tm);
}
else
{
/* '2038-01-19 03:14:07' for 32bit time_t */
value = INT_MAX;
}
}
return value;
}
/*
* Create range object from one or two arguments.
* All not-digit characters in the argument(s) are igonred.
*/
pgRange
make_range(int argc, char * const *argv)
{
pgRange range;
const char *arg1;
const char *arg2;
size_t len;
char *tmp;
int i;
struct tm tm;
char junk[2];
/* takes 0, 1, or 2 arguments */
if (argc > 2)
ereport(ERROR,
(errcode(EINVAL),
errmsg("too many arguments")));
/* no input means unlimited range */
if (argc < 1)
{
range.begin = 0;
range.end = time_max();
return range;
}
arg1 = argv[0];
arg2 = (argc > 1 ? argv[1] : "");
/* tmp = replace( concat(arg1, arg2), !isalnum, ' ' ) */
tmp = pgut_malloc(strlen(arg1) + strlen(arg2) + 1);
len = 0;
for (i = 0; arg1[i]; i++)
tmp[len++] = (IsAlnum(arg1[i]) ? arg1[i] : ' ');
for (i = 0; arg2[i]; i++)
tmp[len++] = (IsAlnum(arg2[i]) ? arg2[i] : ' ');
tmp[len] = '\0';
/* parse for "YYYY-MM-DD HH:MI:SS" */
tm.tm_year = 0; /* tm_year is year - 1900 */
tm.tm_mon = 0; /* tm_mon is 0 - 11 */
tm.tm_mday = 1; /* tm_mday is 1 - 31 */
tm.tm_hour = 0;
tm.tm_min = 0;
tm.tm_sec = 0;
i = sscanf(tmp, "%04d %02d %02d %02d %02d %02d%1s",
&tm.tm_year, &tm.tm_mon, &tm.tm_mday,
&tm.tm_hour, &tm.tm_min, &tm.tm_sec, junk);
if (i < 1 || 6 < i)
ereport(ERROR,
(errcode(EINVAL),
errmsg("invalid range syntax: '%s'", tmp)));
free(tmp);
/* adjust year */
if (tm.tm_year < 100)
tm.tm_year += 2000 - 1900;
else if (tm.tm_year >= 1900)
tm.tm_year -= 1900;
/* adjust month */
if (i > 1)
tm.tm_mon -= 1;
range.begin = mktime(&tm);
switch (i)
{
case 1:
tm.tm_year++;
break;
case 2:
tm.tm_mon++;
break;
case 3:
tm.tm_mday++;
break;
case 4:
tm.tm_hour++;
break;
case 5:
tm.tm_min++;
break;
case 6:
tm.tm_sec++;
break;
}
range.end = mktime(&tm);
return range;
}
/*
* check path is a directory and returns errno of opendir.
* ENOENT is treated as succeeded if missing_ok.
*/
int
check_dir(const char *path, bool missing_ok)
{
DIR *dir;
if ((dir = opendir(path)) == NULL)
{
if (missing_ok && errno == ENOENT)
return 0;
else
return errno;
}
closedir(dir);
return 0;
}
/*
* make sure the directory either doesn't exist or is empty
*
* Returns 0 if nonexistent, 1 if exists and empty, 2 if not empty,
* or -1 if trouble accessing directory
*/
void
make_empty_dir(const char *path)
{
DIR *dir;
errno = 0;
if ((dir = opendir(path)) == NULL)
{
/* Directory does not exist. */
if (errno != ENOENT)
ereport(ERROR,
(errcode_errno(),
errmsg("could not access directory \"%s\": ", path)));
pgut_mkdir(path);
}
else
{
/* Directory exists. */
struct dirent *file;
while ((file = readdir(dir)) != NULL)
{
if (strcmp(".", file->d_name) == 0 ||
strcmp("..", file->d_name) == 0)
{
/* skip this and parent directory */
continue;
}
else
{
/* Present and not empty */
closedir(dir);
ereport(ERROR,
(errcode(EEXIST),
errmsg("directory \"%s\" exists but is not empty", path)));
}
}
#ifdef WIN32
/*
* This fix is in mingw cvs (runtime/mingwex/dirent.c rev 1.4),
* but not in released version
*/
if (GetLastError() == ERROR_NO_MORE_FILES)
errno = 0;
#endif
closedir(dir);
}
}
/*
* Remove files recursively, but follow symbolic link to directories.
* We remove the symbolic link files, but delete the linked directories.
*/
void
remove_file(const char *path)
{
remove_children(path);
if (remove(path) != 0 && errno != ENOENT)
elog(ERROR, "could not remove file \"%s\": %s", path, strerror(errno));
}
void
remove_children(const char *path)
{
DIR *dir;
/* try to open as directory and remove children. */
if ((dir = opendir(path)) != NULL)
{
struct dirent *dent;
while ((dent = readdir(dir)) != NULL)
{
char child[MAXPGPATH];
/* skip entries point current dir or parent dir */
if (strcmp(dent->d_name, ".") == 0 ||
strcmp(dent->d_name, "..") == 0)
continue;
join_path_components(child, path, dent->d_name);
remove_file(child);
}
closedir(dir);
}
}
#ifdef WIN32
#define REPARSE_DATA_SIZE 1024
/* same layout as REPARSE_DATA_BUFFER, which is defined only in old winnt.h */
typedef struct REPARSE_DATA
{
ULONG ReparseTag;
WORD ReparseDataLength;
WORD Reserved;
union
{
struct
{
WORD SubstituteNameOffset;
WORD SubstituteNameLength;
WORD PrintNameOffset;
WORD PrintNameLength;
ULONG Flags;
WCHAR PathBuffer[1];
} Symlink;
struct
{
WORD SubstituteNameOffset;
WORD SubstituteNameLength;
WORD PrintNameOffset;
WORD PrintNameLength;
WCHAR PathBuffer[1];
} Mount;
struct
{
BYTE DataBuffer[REPARSE_DATA_SIZE];
} Generic;
};
} REPARSE_DATA;
ssize_t
readlink(const char *path, char *target, size_t size)
{
HANDLE handle;
DWORD attr;
REPARSE_DATA data;
DWORD datasize;
PCWSTR wpath;
int wlen;
int r;
attr = GetFileAttributes(path);
if (attr == INVALID_FILE_ATTRIBUTES)
{
_dosmaperr(GetLastError());
return -1;
}
if ((attr & FILE_ATTRIBUTE_REPARSE_POINT) == 0)
{
errno = EINVAL; /* not a symlink */
return -1;
}
handle = CreateFileA(path, 0,
FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE, NULL,
OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OPEN_REPARSE_POINT, NULL);
if (handle == INVALID_HANDLE_VALUE)
{
_dosmaperr(GetLastError());
return -1;
}
wpath = NULL;
if (DeviceIoControl(handle, FSCTL_GET_REPARSE_POINT, NULL, 0,
&data, sizeof(data), &datasize, NULL))
{
switch (data.ReparseTag)
{
case IO_REPARSE_TAG_MOUNT_POINT:
{
wpath = data.Mount.PathBuffer + data.Mount.SubstituteNameOffset;
wlen = data.Mount.SubstituteNameLength;
break;
}
case IO_REPARSE_TAG_SYMLINK:
{
wpath = data.Symlink.PathBuffer + data.Symlink.SubstituteNameOffset;
wlen = data.Symlink.SubstituteNameLength;
break;
}
}
}
if (wpath == NULL)
r = -1;
else
{
if (wcsncmp(wpath, L"\\??\\", 4) == 0 ||
wcsncmp(wpath, L"\\\\?\\", 4) == 0)
{
wpath += 4;
wlen -= 4;
}
r = WideCharToMultiByte(CP_ACP, 0, wpath, wlen, target, size, NULL, NULL);
}
CloseHandle(handle);
return r;
}
#endif