summaryrefslogtreecommitdiff
path: root/utils/utils.c
blob: 8cb1987d449fcb962b79fe704be3e7fa0a474150 (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
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
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
/*
 * Copyright 2007 Rob Kendrick <rjek@netsurf-browser.org>
 * Copyright 2004-2007 James Bursa <bursa@users.sourceforge.net>
 * Copyright 2003 Phil Mellor <monkeyson@users.sourceforge.net>
 * Copyright 2003 John M Bell <jmb202@ecs.soton.ac.uk>
 * Copyright 2004 John Tytgat <joty@netsurf-browser.org>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf 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; version 2 of the License.
 *
 * NetSurf 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/>.
 */

#include <assert.h>
#include <ctype.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/time.h>
#include <regex.h>
#include <time.h>

#include "utils/config.h"
#include "utils/messages.h"
#include "utils/utf8.h"
#include "utils/utils.h"

char * strip(char * const s)
{
	size_t i;
	for (i = strlen(s);
			i != 0 && (s[i - 1] == ' ' || s[i - 1] == '\n' ||
			s[i - 1] == '\r' || s[i - 1] == '\t');
			i--)
		;
	s[i] = 0;
	return s + strspn(s, " \t\r\n");
}

int whitespace(const char * str)
{
	unsigned int i;
	for (i = 0; i < strlen(str); i++)
		if (!isspace(str[i]))
			return 0;
	return 1;
}

/**
 * returns a string without its underscores
 * \param replacespace true to insert a space where there was an underscore
 */

char *remove_underscores(const char *s, bool replacespace)
{
	size_t i, ii, len;
	char *ret;
	len = strlen(s);
	ret = malloc(len + 1);
	if (ret == NULL)
		return NULL;
	for (i = 0, ii = 0; i < len; i++) {
		if (s[i] != '_')
			ret[ii++] = s[i];
		else if (replacespace)
			ret[ii++] = ' ';
	}
	ret[ii] = '\0';
	return ret;
}

/**
 * Replace consecutive whitespace with a single space.
 *
 * @todo determine if squash_whitespace utf-8 safe and that it needs to be
 *
 * \param  s  source string
 * \return  heap allocated result, or NULL on memory exhaustion
 */

char *squash_whitespace(const char *s)
{
	char *c;
	int i = 0, j = 0;

	c = malloc(strlen(s) + 1);
	if (c != NULL) {
		do {
			if (s[i] == ' ' ||
			    s[i] == '\n' ||
			    s[i] == '\r' ||
			    s[i] == '\t') {
				c[j++] = ' ';
				while (s[i] == ' ' ||
				       s[i] == '\n' ||
				       s[i] == '\r' ||
				       s[i] == '\t')
					i++;
			}
			c[j++] = s[i++];
		} while (s[i - 1] != 0);
	}
	return c;
}


/**
 * Converts NUL terminated UTF-8 encoded string s containing zero or more
 * spaces (char 32) or TABs (char 9) to non-breaking spaces
 * (0xC2 + 0xA0 in UTF-8 encoding).
 *
 * Caller needs to free() result.  Returns NULL in case of error.  No
 * checking is done on validness of the UTF-8 input string.
 */
char *cnv_space2nbsp(const char *s)
{
	const char *srcP;
	char *d, *d0;
	unsigned int numNBS;
	/* Convert space & TAB into non breaking space character (0xA0) */
	for (numNBS = 0, srcP = (const char *)s; *srcP != '\0'; ++srcP)
		if (*srcP == ' ' || *srcP == '\t')
			++numNBS;
	if ((d = (char *)malloc((srcP - s) + numNBS + 1)) == NULL)
		return NULL;
	for (d0 = d, srcP = (const char *)s; *srcP != '\0'; ++srcP) {
		if (*srcP == ' ' || *srcP == '\t') {
			*d0++ = 0xC2;
			*d0++ = 0xA0;
		} else
			*d0++ = *srcP;
	}
	*d0 = '\0';
	return d;
}

/**
 * Check if a directory exists.
 */

bool is_dir(const char *path)
{
	struct stat s;

	if (stat(path, &s))
		return false;

	return S_ISDIR(s.st_mode) ? true : false;
}


/**
 * Compile a regular expression, handling errors.
 *
 * Parameters as for regcomp(), see man regex.
 */

void regcomp_wrapper(regex_t *preg, const char *regex, int cflags)
{
	int r;
	r = regcomp(preg, regex, cflags);
	if (r) {
		char errbuf[200];
		regerror(r, preg, errbuf, sizeof errbuf);
		fprintf(stderr, "Failed to compile regexp '%s'\n", regex);
		die(errbuf);
	}
}

/** We can have a fairly good estimate of how long the buffer needs to
  * be.  The unsigned long can store a value representing a maximum size
  * of around 4 GB.  Therefore the greatest space required is to
  * represent 1023MB.  Currently that would be represented as "1023MB" so 12
  * including a null terminator.
  * Ideally we would be able to know this value for sure, in the mean
  * time the following should suffice.
 **/

#define BYTESIZE_BUFFER_SIZE 20

/**
  * Does a simple conversion which assumes the user speaks English.  The buffer
  * returned is one of three static ones so may change each time this call is
  * made.  Don't store the buffer for later use.  It's done this way for
  * convenience and to fight possible memory leaks, it is not necessarily pretty.
 **/

char *human_friendly_bytesize(unsigned long bsize) {
	static char buffer1[BYTESIZE_BUFFER_SIZE];
	static char buffer2[BYTESIZE_BUFFER_SIZE];
	static char buffer3[BYTESIZE_BUFFER_SIZE];
	static char *curbuffer = buffer3;
	enum {bytes, kilobytes, megabytes, gigabytes} unit = bytes;
	static char units[][7] = {"Bytes", "kBytes", "MBytes", "GBytes"};

	float bytesize = (float)bsize;

	if (curbuffer == buffer1)
		curbuffer = buffer2;
	else if (curbuffer == buffer2)
		curbuffer = buffer3;
	else
		curbuffer = buffer1;

	if (bytesize > 1024) {
		bytesize /= 1024;
		unit = kilobytes;
	}

	if (bytesize > 1024) {
		bytesize /= 1024;
		unit = megabytes;
	}

	if (bytesize > 1024) {
		bytesize /= 1024;
		unit = gigabytes;
	}

	sprintf(curbuffer, "%3.2f%s", bytesize, messages_get(units[unit]));

	return curbuffer;
}

/**
 * Create an RFC 1123 compliant date string from a Unix timestamp
 *
 * \param t The timestamp to consider
 * \return Pointer to buffer containing string - invalidated by next call.
 */
const char *rfc1123_date(time_t t)
{
	static char ret[30];

	struct tm *tm = gmtime(&t);
	const char *days[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" },
		*months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
				"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };

	snprintf(ret, sizeof ret, "%s, %02d %s %d %02d:%02d:%02d GMT",
			days[tm->tm_wday], tm->tm_mday, months[tm->tm_mon],
			tm->tm_year + 1900, tm->tm_hour, tm->tm_min,
			tm->tm_sec);

	return ret;
}

/**
 * Returns a number of centiseconds, that increases in real time, for the
 * purposes of measuring how long something takes in wall-clock terms.  It uses
 * gettimeofday() for this.  Should the call to gettimeofday() fail, it returns
 * zero.
 *
 * \return number of centiseconds that increases monotonically
 */
unsigned int wallclock(void)
{
	struct timeval tv;

	if (gettimeofday(&tv, NULL) == -1)
		return 0;

	return ((tv.tv_sec * 100) + (tv.tv_usec / 10000));
}

#ifndef HAVE_STRCASESTR

/**
 * Case insensitive strstr implementation
 *
 * \param haystack String to search in
 * \param needle String to look for
 * \return Pointer to start of found substring, or NULL if not found
 */
char *strcasestr(const char *haystack, const char *needle)
{
	size_t needle_len = strlen(needle);
	const char * last_start = haystack + (strlen(haystack) - needle_len);

	while (haystack <= last_start) {
		if (strncasecmp(haystack, needle, needle_len) == 0)
			return (char *)haystack;
		haystack++;
	}

	return NULL;
}

#endif

#ifndef HAVE_STRNDUP

/**
 * Duplicate up to n characters of a string.
 */

char *strndup(const char *s, size_t n)
{
	size_t len;
	char *s2;

	for (len = 0; len != n && s[len]; len++)
		continue;

	s2 = malloc(len + 1);
	if (!s2)
		return 0;

	memcpy(s2, s, len);
	s2[len] = 0;
	return s2;
}

#endif


/* Exported interface, documented in utils.c */
int dir_sort_alpha(const struct dirent **d1, const struct dirent **d2)
{
	const char *s1 = (*d1)->d_name;
	const char *s2 = (*d2)->d_name;

	while (*s1 != '\0' && *s2 != '\0') {
		if ((*s1 >= '0' && *s1 <= '9') &&
				(*s2 >= '0' && *s2 <= '9')) {
			int n1 = 0,  n2 = 0;
			while (*s1 >= '0' && *s1 <= '9') {
				n1 = n1 * 10 + (*s1) - '0';
				s1++;
			}
			while (*s2 >= '0' && *s2 <= '9') {
				n2 = n2 * 10 + (*s2) - '0';
				s2++;
			}
			if (n1 != n2) {
				return n1 - n2;
			}
			if (*s1 == '\0' || *s2 == '\0')
				break;
		}
		if (tolower(*s1) != tolower(*s2))
			break;

		s1++;
		s2++;
	}

	return tolower(*s1) - tolower(*s2);
}


#ifndef HAVE_SCANDIR
int alphasort(const struct dirent **d1, const struct dirent **d2)
{
	return strcasecmp((*d1)->d_name, (*d2)->d_name);
}

int scandir(const char *dir, struct dirent ***namelist,
		int (*sel)(const struct dirent *),
		int (*compar)(const struct dirent **, const struct dirent **))
{
	struct dirent **entlist = NULL;
	struct dirent **entlist_temp = NULL;
	struct dirent *ent = NULL, *new_ent;
	int alloc_n = 0;
	int n = 0;
	DIR *d;

	d = opendir(dir);
	if (d == NULL) {
		goto error;
	}

	while ((ent = readdir(d)) != NULL) {
		/* Avoid entries that caller doesn't want */
		if (sel && (*sel)(ent) == 0)
			continue;

		/* Ensure buffer is big enough to list this entry */
		if (n == alloc_n) {
			alloc_n *= 4;
			if (alloc_n == 0) {
				alloc_n = 32;
			}
			entlist_temp = realloc(entlist,
					sizeof(*entlist) * alloc_n);
			if (entlist_temp == NULL) {
				goto error;
			}
			entlist = entlist_temp;
		}

		/* Make copy of ent */
		new_ent = malloc(sizeof(*new_ent));
		if (new_ent == NULL) {
			goto error;
		}
		memcpy(new_ent, ent, sizeof(struct dirent));

		/* Make list entry point to this copy of ent */
		entlist[n] = new_ent;

		n++;
	}

	closedir(d);

	/* Sort */
	if (compar != NULL && n > 1)
		qsort(entlist, n, sizeof(*entlist),
				(int (*)(const void *, const void *))compar);
	*namelist = entlist;
	return n;

error:

	if (entlist != NULL) {
		int i;
		for (i = 0; i < n; i++) {
			free(entlist[i]);
		}
		free(entlist);
	}

	if (d != NULL) {
		closedir(d);
	}

	return -1;
}

#endif


#ifndef HAVE_STRCHRNUL

/**
 *  Find the first occurrence of C in S or the final NUL byte.
 */
char *strchrnul (const char *s, int c_in)
{
	const unsigned char *us = (const unsigned char *) s;

	while (*us != c_in && *us != '\0')
		us++;

	return (void *) us;
}

#endif

#ifndef HAVE_UTSNAME
#include "utils/utsname.h"

int uname(struct utsname *buf) {
	strcpy(buf->sysname,"windows");
	strcpy(buf->nodename,"nodename");
	strcpy(buf->release,"release");
	strcpy(buf->version,"version");
	strcpy(buf->machine,"pc");
	
	return 0;
}
#endif

#ifndef HAVE_REALPATH
char *realpath(const char *path, char *resolved_path)
{
	char *ret;
	if (resolved_path == NULL) {
		ret=strdup(path);
	} else {
		ret = resolved_path;
		strcpy(resolved_path, path);
	}
	return ret;
}

#ifndef HAVE_INETATON


int inet_aton(const char *cp, struct in_addr *inp)
{
	unsigned int b1, b2, b3, b4;
	unsigned char c;

	if (strspn(cp, "0123456789.") < strlen(cp)) 
		return 0;

	if (sscanf(cp, "%3u.%3u.%3u.%3u%c", &b1, &b2, &b3, &b4, &c) != 4)
		return 0;

	if ((b1 > 255) || (b2 > 255) || (b3 > 255) || (b4 > 255))
		return 0;

	inp->s_addr = b4 << 24 | b3 << 16 | b2 << 8 | b1;

	return 1;
}

#endif

#ifndef HAVE_INETPTON

int inet_pton(int af, const char *src, void *dst)
{
	int ret;

	if (af == AF_INET) {
		ret = inet_aton(src, dst);
	} 
#if !defined(NO_IPV6)
	else if (af == AF_INET6) {
		/* TODO: implement v6 address support */
		ret = -1;
		errno = EAFNOSUPPORT; 
	} 
#endif
	else {
		ret = -1;
		errno = EAFNOSUPPORT; 
	}

	return ret;
}

#endif


#endif