File: System.c

package info (click to toggle)
fvwm 1:2.6.8-1
  • links: PTS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 15,804 kB
  • sloc: ansic: 145,770; xml: 17,093; perl: 7,302; sh: 4,921; makefile: 1,094; yacc: 688; lex: 187; sed: 11
file content (360 lines) | stat: -rw-r--r-- 7,735 bytes parent folder | download
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
/* -*-c-*- */
/* This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see: <http://www.gnu.org/licenses/>
 */

/*
 * System.c: code for dealing with various OS system call variants
 */

#include "config.h"
#include "fvwmlib.h"
#include "envvar.h"
#include "System.h"
#include "Strings.h"

#if HAVE_UNAME
#include <sys/utsname.h>
#endif
#include "libs/fvwm_sys_stat.h"

#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif


/*
 * just in case...
 */
#ifndef FD_SETSIZE
#define FD_SETSIZE 2048
#endif


fd_set_size_t fvwmlib_max_fd = (fd_set_size_t)-9999999;

fd_set_size_t GetFdWidth(void)
{
#if HAVE_SYSCONF
	return min(sysconf(_SC_OPEN_MAX),FD_SETSIZE);
#else
	return min(getdtablesize(),FD_SETSIZE);
#endif
}

void fvwmlib_init_max_fd(void)
{
	fvwmlib_max_fd = GetFdWidth();

	return;
}


/* return a string indicating the OS type (i.e. "Linux", "SINIX-D", ... ) */
int getostype(char *buf, int max)
{
#if HAVE_UNAME
	struct utsname sysname;

	if (uname( &sysname ) >= 0)
	{
		buf[0] = '\0';
		strncat(buf, sysname.sysname, max);
		return 0;
	}
#endif
	strcpy (buf, "");
	return -1;
}


/*
 * Set a colon-separated path, with environment variable expansions,
 * and expand '+' to be the value of the previous path.
 */
void setPath(char **p_path, const char *newpath, int free_old_path)
{
	char *oldpath = *p_path;
	int oldlen = strlen(oldpath);
	char *stripped_path = stripcpy(newpath);
	int found_plus = strchr(newpath, '+') != NULL;

	/* Leave room for the old path, if we find a '+' in newpath */
	*p_path = envDupExpand(stripped_path, found_plus ? oldlen - 1 : 0);
	free(stripped_path);

	if (found_plus)
	{
		char *p = strchr(*p_path, '+');
		memmove(p + oldlen, p + 1, strlen(p + 1) + 1);
		memmove(p, oldpath, oldlen);
	}

	if (free_old_path)
	{
		free(oldpath);
	}
}


/*
 *
 * Find the specified file somewhere along the given path.
 *
 * There is a possible race condition here:  We check the file and later
 * do something with it.  By then, the file might not be accessible.
 * Oh well.
 *
 */
#include <stdio.h>
char *searchPath(
	const char *pathlist, const char *filename, const char *suffix,
	int type)
{
	char *path;
	int filename_len;
	int maxpath_len;

	if (filename == NULL || *filename == 0)
	{
		return NULL;
	}

	if (pathlist == NULL || *pathlist == 0)
	{
		/* use pwd if no path list is given */
		pathlist = ".";
	}

	filename_len = strlen(filename);
	maxpath_len = (pathlist) ? strlen(pathlist) : 0;
	maxpath_len += (suffix) ? strlen(suffix) : 0;

	/* +1 for extra / and +1 for null termination */
	path = safemalloc(maxpath_len + filename_len + 2);
	*path = '\0';

	if (*filename == '/')
	{
		/* No search if filename begins with a slash */
		strcpy(path, filename);

		/* test if the path is accessable -- the module code assumes
		 * this is done */
		if (access(filename, type) == 0)
		{
			return path;
		}

		/* the file is not accessable (don't test suffixes with full
		 * path), return NULL */
		free(path);

		return NULL;
	}

	/* Search each element of the pathlist for the file */
	while (pathlist && *pathlist)
	{
		char *path_end = strchr(pathlist, ':');
		char *curr_end;

		if (path_end != NULL)
		{
			strncpy(path, pathlist, path_end - pathlist);
			path[path_end - pathlist] = '\0';
		}
		else
		{
			strcpy(path, pathlist);
		}

		/* handle specially the path extention using semicolon */
		curr_end = strchr(path, ';');
		if (curr_end != NULL)
		{
			char *dot = strrchr(filename, '.');
			int filebase_len;
			/* count a leading nil in newext_len too */
			int newext_len = path + strlen(path) - curr_end;
			if (dot != NULL)
			{
				filebase_len = dot - filename;
			}
			else
			{
				filebase_len = filename_len;
			}
			*(curr_end++) = '/';
			memmove(curr_end + filebase_len, curr_end, newext_len);
			strncpy(curr_end, filename, filebase_len);
		}
		else
		{
			strcat(path, "/");
			strcat(path, filename);
		}

		if (access(path, type) == 0)
		{
			return path;
		}

		if (suffix && *suffix != '\0') {
			strcat(path, suffix);
			if (access(path, type) == 0)
			{
				return path;
			}
		}

		/* Point to next element of the path */
		if (path_end == NULL)
		{
			break;
		}
		else
		{
			pathlist = path_end + 1;
		}
	}

	/* Hmm, couldn't find the file.  Return NULL */
	free(path);
	return NULL;
}

/*
 * void setFileStamp(FileStamp *stamp, const char *name);
 * Bool isFileStampChanged(const FileStamp *stamp, const char *name);
 *
 * An interface for verifying cached files.
 * The first function associates a file stamp with file (named by name).
 * The second function returns True or False in case the file was changed
 * from the time the stamp was associated.
 *
 * FileStamp can be a structure; try to save memory by evaluating a checksum.
 */

FileStamp getFileStamp(const char *name)
{
	static struct stat buf;

	if (!name || stat(name, &buf))
	{
		return 0;
	}
	return ((FileStamp)buf.st_mtime << 13) + (FileStamp)buf.st_size;
}

void setFileStamp(FileStamp *stamp, const char *name)
{
	*stamp = getFileStamp(name);
}

Bool isFileStampChanged(const FileStamp *stamp, const char *name)
{
	return *stamp != getFileStamp(name);
}

#ifdef HAVE_SAFETY_MKSTEMP
int fvwm_mkstemp (char *TEMPLATE)
{
	return mkstemp(TEMPLATE);
}
#else

/* This function is an adaptation of the mkstemp() function included
 * in the Gnu C Library, version 2.2.2. The Gnu C library, in turn,
 * adapted the function from OpenBSD.
 * Michael Han <mikehan@mikehan.com> */

#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "ftime.h"

#define __set_errno(val) errno = (val)

/* These are the characters used in temporary filenames.  */
static const char letters[] =
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";

/* Generate a unique temporary file name from TEMPLATE.
   The last six characters of TEMPLATE must be "XXXXXX";
   they are replaced with a string that makes the filename unique.
   Then open the file and return a fd. */

int fvwm_mkstemp (char *template)
{
	int len;
	char *XXXXXX;
	static unsigned long value;
	struct timeval tv;
	int count, fd = -1;
	int save_errno = errno;

	len = strlen (template);
	if (len < 6 || strcmp (&template[len - 6], "XXXXXX"))
	{
		__set_errno (EINVAL);
		return -1;
	}

	/* This is where the Xs start.  */
	XXXXXX = &template[len - 6];

	/* Get some more or less random data.  */
	gettimeofday (&tv, NULL);
	value = ((unsigned long) tv.tv_usec << 16) ^ tv.tv_sec ^ getpid ();

	for (count = 0; count < TMP_MAX; value = 7777, count)
	{
		unsigned long v = value;

		/* Fill in the random bits.  */
		XXXXXX[0] = letters[v % 62];
		v /= 62;
		XXXXXX[1] = letters[v % 62];
		v /= 62;
		XXXXXX[2] = letters[v % 62];
		v /= 62;
		XXXXXX[3] = letters[v % 62];
		v /= 62;
		XXXXXX[4] = letters[v % 62];
		v /= 62;
		XXXXXX[5] = letters[v % 62];

		fd = open(
			template, O_RDWR | O_CREAT | O_EXCL,
			FVWM_S_IRUSR | FVWM_S_IWUSR);
		if (fd >= 0)
		{
			__set_errno (save_errno);
			return fd;
		}
		else if (errno != EEXIST)
		{
			return -1;
		}
	}

	/* We got out of the loop because we ran out of combinations to try.  */
	__set_errno (EEXIST);
	return -1;
}

#endif /* HAVE_SAFETY_MKSTEMP */