aboutsummaryrefslogtreecommitdiff
path: root/src/include/gnunet_strings_lib.h
blob: 1fe04da6b1de90b35e957b2e69f30b32e3ee6cda (plain) (blame)
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
/*
     This file is part of GNUnet.
     (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2012 Christian Grothoff (and other contributing authors)

     GNUnet 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 3, or (at your
     option) any later version.

     GNUnet 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 GNUnet; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
     Boston, MA 02111-1307, USA.
*/

/**
 * @file include/gnunet_strings_lib.h
 * @brief strings and string handling functions (including malloc
 *        and string tokenizing)
 *
 * @author Christian Grothoff
 * @author Krista Bennett
 * @author Gerd Knorr <kraxel@bytesex.org>
 * @author Ioana Patrascu
 * @author Tzvetan Horozov
 */

#ifndef GNUNET_STRINGS_LIB_H
#define GNUNET_STRINGS_LIB_H

/* we need size_t, and since it can be both unsigned int
   or unsigned long long, this IS platform dependent;
   but "stdlib.h" should be portable 'enough' to be
   unconditionally available... */
#include <stdlib.h>

#ifdef __cplusplus
extern "C"
{
#if 0                           /* keep Emacsens' auto-indent happy */
}
#endif
#endif

#include "gnunet_time_lib.h"


/**
 * Convert a given fancy human-readable size to bytes.
 *
 * @param fancy_size human readable string (i.e. 1 MB)
 * @param size set to the size in bytes
 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
 */
int
GNUNET_STRINGS_fancy_size_to_bytes (const char *fancy_size,
                                    unsigned long long *size);


/**
 * Convert a given fancy human-readable time to our internal
 * representation.
 *
 * @param fancy_time human readable string (i.e. 1 minute)
 * @param rtime set to the relative time
 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
 */
int
GNUNET_STRINGS_fancy_time_to_relative (const char *fancy_time,
                                       struct GNUNET_TIME_Relative *rtime);


/**
 * Convert a given fancy human-readable time to our internal
 * representation.
 *
 * @param fancy_time human readable string (i.e. %Y-%m-%d %H:%M:%S)
 * @param atime set to the absolute time
 * @return GNUNET_OK on success, GNUNET_SYSERR on error
 */
int
GNUNET_STRINGS_fancy_time_to_absolute (const char *fancy_time,
                                       struct GNUNET_TIME_Absolute *atime);


/**
 * Convert a given filesize into a fancy human-readable format.
 *
 * @param size number of bytes
 * @return fancy representation of the size (possibly rounded) for humans
 */
char *
GNUNET_STRINGS_byte_size_fancy (unsigned long long size);


/**
 * Convert the len characters long character sequence
 * given in input that is in the given input charset
 * to a string in given output charset.
 * @return the converted string (0-terminated),
 *  if conversion fails, a copy of the orignal
 *  string is returned.
 */
char *
GNUNET_STRINGS_conv (const char *input, size_t len,
		     const char *input_charset,
		     const char *output_charset);


/**
 * Convert the len characters long character sequence
 * given in input that is in the given charset
 * to UTF-8.
 *
 * @param input the input string (not necessarily 0-terminated)
 * @param len the number of bytes in the input
 * @param charset character set to convert from
 * @return the converted string (0-terminated)
 */
char *
GNUNET_STRINGS_to_utf8 (const char *input, 
			size_t len, 
			const char *charset);


/**
 * Convert the len bytes-long UTF-8 string
 * given in input to the given charset.

 * @return the converted string (0-terminated),
 *  if conversion fails, a copy of the orignal
 *  string is returned.
 */
char *
GNUNET_STRINGS_from_utf8 (const char *input, 
			  size_t len, 
			  const char *charset);


/**
 * Convert the utf-8 input string to lowercase
 * Output needs to be allocated appropriately
 *
 * @param input input string
 * @param output output buffer
 */
void
GNUNET_STRINGS_utf8_tolower (const char* input, 
			     char** output);


/**
 * Convert the utf-8 input string to lowercase
 * Output needs to be allocated appropriately
 *
 * @param input input string
 * @param output output buffer
 */
void
GNUNET_STRINGS_utf8_toupper (const char* input,
			     char** output);


/**
 * Complete filename (a la shell) from abbrevition.
 *
 * @param fil the name of the file, may contain ~/ or
 *        be relative to the current directory
 * @return the full file name,
 *          NULL is returned on error
 */
char *
GNUNET_STRINGS_filename_expand (const char *fil);


/**
 * Fill a buffer of the given size with count 0-terminated strings
 * (given as varargs).  If "buffer" is NULL, only compute the amount
 * of space required (sum of "strlen(arg)+1").
 *
 * Unlike using "snprintf" with "%s", this function will add
 * 0-terminators after each string.  The
 * "GNUNET_string_buffer_tokenize" function can be used to parse the
 * buffer back into individual strings.
 *
 * @param buffer the buffer to fill with strings, can
 *               be NULL in which case only the necessary
 *               amount of space will be calculated
 * @param size number of bytes available in buffer
 * @param count number of strings that follow
 * @param ... count 0-terminated strings to copy to buffer
 * @return number of bytes written to the buffer
 *         (or number of bytes that would have been written)
 */
size_t
GNUNET_STRINGS_buffer_fill (char *buffer, 
			    size_t size, 
			    unsigned int count, 
			    ...);


/**
 * Given a buffer of a given size, find "count" 0-terminated strings
 * in the buffer and assign the count (varargs) of type "const char**"
 * to the locations of the respective strings in the buffer.
 *
 * @param buffer the buffer to parse
 * @param size size of the buffer
 * @param count number of strings to locate
 * @param ... pointers to where to store the strings
 * @return offset of the character after the last 0-termination
 *         in the buffer, or 0 on error.
 */
unsigned int
GNUNET_STRINGS_buffer_tokenize (const char *buffer, size_t size,
                                unsigned int count, ...);



/**
 * "asctime", except for GNUnet time.
 * This is one of the very few calls in the entire API that is
 * NOT reentrant!
 *
 * @param t the absolute time to convert
 * @return timestamp in human-readable form
 */
const char *
GNUNET_STRINGS_absolute_time_to_string (struct GNUNET_TIME_Absolute t);


/**
 * Give relative time in human-readable fancy format.
 * This is one of the very few calls in the entire API that is
 * NOT reentrant! 
 *
 * @param delta time in milli seconds
 * @param do_round are we allowed to round a bit?
 * @return string in human-readable form
 */
const char *
GNUNET_STRINGS_relative_time_to_string (struct GNUNET_TIME_Relative delta,
					int do_round);


/**
 * "man basename"
 * Returns a pointer to a part of filename (allocates nothing)!
 *
 * @param filename filename to extract basename from
 * @return short (base) name of the file (that is, everything following the
 *         last directory separator in filename. If filename ends with a
 *         directory separator, the result will be a zero-length string.
 *         If filename has no directory separators, the result is filename
 *         itself.
 */
const char *
GNUNET_STRINGS_get_short_name (const char *filename);


/**
 * Convert binary data to ASCII encoding.  The ASCII encoding is rather
 * GNUnet specific.  It was chosen such that it only uses characters
 * in [0-9A-V], can be produced without complex arithmetics and uses a
 * small number of characters.  The GNUnet encoding uses 103 characters.
 * Does not append 0-terminator, but returns a pointer to the place where
 * it should be placed, if needed.
 *
 * @param data data to encode
 * @param size size of data (in bytes)
 * @param out buffer to fill
 * @param out_size size of the buffer. Must be large enough to hold
 * ((size*8) + (((size*8) % 5) > 0 ? 5 - ((size*8) % 5) : 0)) / 5
 * @return pointer to the next byte in 'out' or NULL on error.
 */
char *
GNUNET_STRINGS_data_to_string (const void *data, 
			       size_t size,
			       char *out, 
			       size_t out_size);


/**
 * Convert ASCII encoding back to data
 * out_size must match exactly the size of the data before it was encoded.
 *
 * @param enc the encoding
 * @param enclen number of characters in 'enc' (without 0-terminator, which can be missing)
 * @param out location where to store the decoded data
 * @param out_size size of the output buffer
 * @return GNUNET_OK on success, GNUNET_SYSERR if result has the wrong encoding
 */
int
GNUNET_STRINGS_string_to_data (const char *enc, 
			       size_t enclen,
			       void *out, 
			       size_t out_size);


/**
 * Parse a path that might be an URI.
 *
 * @param path path to parse. Must be NULL-terminated.
 * @param scheme_part a pointer to 'char *' where a pointer to a string that
 *        represents the URI scheme will be stored. Can be NULL. The string is
 *        allocated by the function, and should be freed by GNUNET_free() when
 *        it is no longer needed.
 * @param path_part a pointer to 'const char *' where a pointer to the path
 *        part of the URI will be stored. Can be NULL. Points to the same block
 *        of memory as 'path', and thus must not be freed. Might point to '\0',
 *        if path part is zero-length.
 * @return GNUNET_YES if it's an URI, GNUNET_NO otherwise. If 'path' is not
 *         an URI, '* scheme_part' and '*path_part' will remain unchanged
 *         (if they weren't NULL).
 */
int
GNUNET_STRINGS_parse_uri (const char *path, 
			  char **scheme_part,
			  const char **path_part);


/**
 * Check whether filename is absolute or not, and if it's an URI
 *
 * @param filename filename to check
 * @param can_be_uri GNUNET_YES to check for being URI, GNUNET_NO - to
 *        assume it's not URI
 * @param r_is_uri a pointer to an int that is set to GNUNET_YES if 'filename'
 *        is URI and to GNUNET_NO otherwise. Can be NULL. If 'can_be_uri' is
 *        not GNUNET_YES, *r_is_uri is set to GNUNET_NO.
 * @param r_uri_scheme a pointer to a char * that is set to a pointer to URI scheme.
 *        The string is allocated by the function, and should be freed with
 *        GNUNET_free (). Can be NULL.
 * @return GNUNET_YES if 'filename' is absolute, GNUNET_NO otherwise.
 */
int
GNUNET_STRINGS_path_is_absolute (const char *filename, 
				 int can_be_uri,
				 int *r_is_uri, 
				 char **r_uri_scheme);


/**
 * Flags for what we should check a file for.
 */
enum GNUNET_STRINGS_FilenameCheck
{
  /**
   * Check that it exists.
   */
  GNUNET_STRINGS_CHECK_EXISTS = 0x00000001,

  /**
   * Check that it is a directory.
   */
  GNUNET_STRINGS_CHECK_IS_DIRECTORY = 0x00000002,

  /**
   * Check that it is a link.
   */
  GNUNET_STRINGS_CHECK_IS_LINK = 0x00000004,

  /**
   * Check that the path is an absolute path.
   */ 
  GNUNET_STRINGS_CHECK_IS_ABSOLUTE = 0x00000008
};


/**
 * Perform checks on 'filename'.  FIXME: some duplication with
 * "GNUNET_DISK_"-APIs.  We should unify those.
 * 
 * @param filename file to check
 * @param checks checks to perform
 * @return GNUNET_YES if all checks pass, GNUNET_NO if at least one of them
 *         fails, GNUNET_SYSERR when a check can't be performed
 */
int
GNUNET_STRINGS_check_filename (const char *filename,
			       enum GNUNET_STRINGS_FilenameCheck checks);


/**
 * Tries to convert 'zt_addr' string to an IPv6 address.
 * The string is expected to have the format "[ABCD::01]:80".
 * 
 * @param zt_addr 0-terminated string. May be mangled by the function.
 * @param addrlen length of zt_addr (not counting 0-terminator).
 * @param r_buf a buffer to fill. Initially gets filled with zeroes,
 *        then its sin6_port, sin6_family and sin6_addr are set appropriately.
 * @return GNUNET_OK if conversion succeded. GNUNET_SYSERR otherwise, in which
 *         case the contents of r_buf are undefined.
 */
int
GNUNET_STRINGS_to_address_ipv6 (const char *zt_addr, 
				uint16_t addrlen,
				struct sockaddr_in6 *r_buf);


/**
 * Tries to convert 'zt_addr' string to an IPv4 address.
 * The string is expected to have the format "1.2.3.4:80".
 * 
 * @param zt_addr 0-terminated string. May be mangled by the function.
 * @param addrlen length of zt_addr (not counting 0-terminator).
 * @param r_buf a buffer to fill.
 * @return GNUNET_OK if conversion succeded. GNUNET_SYSERR otherwise, in which case
 *         the contents of r_buf are undefined.
 */
int
GNUNET_STRINGS_to_address_ipv4 (const char *zt_addr, 
				uint16_t addrlen,
				struct sockaddr_in *r_buf);


/**
 * Tries to convert 'addr' string to an IP (v4 or v6) address.
 * Will automatically decide whether to treat 'addr' as v4 or v6 address.
 * 
 * @param addr a string, may not be 0-terminated.
 * @param addrlen number of bytes in addr (if addr is 0-terminated,
 *        0-terminator should not be counted towards addrlen).
 * @param r_buf a buffer to fill.
 * @return GNUNET_OK if conversion succeded. GNUNET_SYSERR otherwise, in which
 *         case the contents of r_buf are undefined.
 */
int
GNUNET_STRINGS_to_address_ip (const char *addr,
			      uint16_t addrlen,
			      struct sockaddr_storage *r_buf);


/**
 * Returns utf-8 encoded arguments.
 * Does nothing (returns a copy of argc and argv) on any platform
 * other than W32.
 * Returned argv has u8argv[u8argc] == NULL.
 * Returned argv is a single memory block, and can be freed with a single
 *   GNUNET_free () call.
 *
 * @param argc argc (as given by main())
 * @param argv argv (as given by main())
 * @param u8argc a location to store new argc in (though it's th same as argc)
 * @param u8argv a location to store new argv in
 * @return GNUNET_OK on success, GNUNET_SYSERR on failure
 */
int
GNUNET_STRINGS_get_utf8_args (int argc, 
			      char *const *argv, 
			      int *u8argc,
                              char *const **u8argv);


#if 0                           /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif


/* ifndef GNUNET_UTIL_STRING_H */
#endif
/* end of gnunet_util_string.h */