about summary refs log tree commit diff
path: root/string/bits/string2.h
blob: e0a8e75311b0995f91f4d6ce653f8438c028fcfe (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
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
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
/* Machine-independant string function optimizations.
   Copyright (C) 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#ifndef _STRING_H
# error "Never use <bits/string2.h> directly; include <string.h> instead."
#endif

#ifndef __NO_STRING_INLINES

/* Unlike the definitions in the header <bits/string.h> the
   definitions contained here are not optimizing down to assembler
   level.  These optimizations are not always a good idea since this
   means the code size increases a lot.  Instead the definitions here
   optimize some functions in a way which does not dramatically
   increase the code size and which does not use assembler.  The main
   trick is to use GNU CC's `__builtin_constant_p' function.

   Every function XXX which has a defined version in
   <bits/string.h> must be accompanied by a symbol _HAVE_STRING_ARCH_XXX
   to make sure we don't get redefinitions.

   We must use here macros instead of inline functions since the
   trick won't work with the later.  */

#ifdef __cplusplus
# define __STRING_INLINE inline
#else
# define __STRING_INLINE extern __inline
#endif

#if _STRING_ARCH_unaligned
/* If we can do unaligned memory accesses we must know the endianess.  */
# include <endian.h>
# include <bits/types.h>

# if __BYTE_ORDER == __LITTLE_ENDIAN
#  define __STRING2_SMALL_GET16(src, idx) \
     (((src)[idx + 1] << 8) | (src)[idx])
#  define __STRING2_SMALL_GET32(src, idx) \
     ((((src)[idx + 3] << 8 | (src)[idx + 2]) << 8			      \
       | (src)[idx + 1]) << 8 | (src)[idx])
# else
#  define __STRING2_SMALL_GET16(src, idx) \
     (((src)[idx] << 8) | (src)[idx + 1])
#  define __STRING2_SMALL_GET32(src, idx) \
     ((((src)[idx] << 8 | (src)[idx + 1]) << 8				      \
       | (src)[idx + 2]) << 8 | (src)[idx + 3])
# endif
#else
/* These are a few types we need for the optimizations if we cannot
   use unaligned memory accesses.  */
# define __STRING2_COPY_TYPE(N) \
  typedef struct { char __arr[N]; }					      \
    __STRING2_COPY_ARR##N __attribute__ ((packed))
__STRING2_COPY_TYPE (2);
__STRING2_COPY_TYPE (3);
__STRING2_COPY_TYPE (4);
__STRING2_COPY_TYPE (5);
__STRING2_COPY_TYPE (6);
__STRING2_COPY_TYPE (7);
__STRING2_COPY_TYPE (8);
# undef __STRING2_COPY_TYPE
#endif


/* Set N bytes of S to C.  */
#ifndef _HAVE_STRING_ARCH_memset
# define memset(s, c, n) \
  (__extension__ (__builtin_constant_p (c) && (c) == '\0'		      \
		  ? ({ void *__s = (s); __bzero (__s, n); __s; })	      \
		  : memset (s, c, n)))
#endif


/* Copy SRC to DEST.  */
#ifndef _HAVE_STRING_ARCH_strcpy
# define strcpy(dest, src) \
  (__extension__ (__builtin_constant_p (src)				      \
		  ? (sizeof ((src)[0]) == 1 && strlen (src) + 1 <= 8	      \
		     ? __strcpy_small (dest, src, strlen (src) + 1)	      \
		     : (char *) memcpy (dest, src, strlen (src) + 1))	      \
		  : strcpy (dest, src)))

# if _STRING_ARCH_unaligned
#  define __strcpy_small(dest, src, srclen) \
  (__extension__ ({ unsigned char *__dest = (unsigned char *) (dest);	      \
		    switch (srclen)					      \
		      {							      \
		      case 1:						      \
			*__dest = '\0';					      \
			break;						      \
		      case 2:						      \
			*((__uint16_t *) __dest) =			      \
			  __STRING2_SMALL_GET16 (src, 0);		      \
			break;						      \
		      case 3:						      \
			*((__uint16_t *) __dest) =			      \
			  __STRING2_SMALL_GET16 (src, 0);		      \
			*(__dest + 2) = '\0';				      \
			break;						      \
		      case 4:						      \
			*((__uint32_t *) __dest) =			      \
			  __STRING2_SMALL_GET32 (src, 0);		      \
			break;						      \
		      case 5:						      \
			*((__uint32_t *) __dest) =			      \
			  __STRING2_SMALL_GET32 (src, 0);		      \
			*(__dest + 4) = '\0';				      \
			break;						      \
		      case 6:						      \
			*((__uint32_t *) __dest) =			      \
			  __STRING2_SMALL_GET32 (src, 0);		      \
			*((__uint16_t *) (__dest + 4)) =		      \
			  __STRING2_SMALL_GET16 (src, 4);		      \
			break;						      \
		      case 7:						      \
			*((__uint32_t *) __dest) =			      \
			  __STRING2_SMALL_GET32 (src, 0);		      \
			*((__uint16_t *) (__dest + 4)) =		      \
			  __STRING2_SMALL_GET16 (src, 4);		      \
			*(__dest + 6) = '\0';				      \
			break;						      \
		      case 8:						      \
			*((__uint32_t *) __dest) =			      \
			  __STRING2_SMALL_GET32 (src, 0);		      \
			*((__uint32_t *) (__dest + 4)) =		      \
			  __STRING2_SMALL_GET32 (src, 4);		      \
			break;						      \
		      }							      \
		    (char *) __dest; }))
# else
#  define __strcpy_small(dest, src, srclen) \
  (__extension__ ({ unsigned char *__dest = (unsigned char *) (dest);	      \
		    switch (srclen)					      \
		      {							      \
		      case 1:						      \
			*__dest = '\0';					      \
			break;						      \
		      case 2:						      \
			*((__STRING2_COPY_ARR2 *) __dest) =		      \
			  ((__STRING2_COPY_ARR2) { { (src)[0], '\0' } });     \
			break;						      \
		      case 3:						      \
			*((__STRING2_COPY_ARR3 *) __dest) =		      \
			  ((__STRING2_COPY_ARR3) { { (src)[0], (src)[1],      \
						     '\0' } });		      \
			break;						      \
		      case 4:						      \
			*((__STRING2_COPY_ARR4 *) __dest) =		      \
			  ((__STRING2_COPY_ARR4) { { (src)[0], (src)[1],      \
						     (src)[2], '\0' } });     \
			break;						      \
		      case 5:						      \
			*((__STRING2_COPY_ARR5 *) __dest) =		      \
			  ((__STRING2_COPY_ARR5) { { (src)[0], (src)[1],      \
						     (src)[2], (src)[3],      \
						     '\0' } });		      \
			break;						      \
		      case 6:						      \
			*((__STRING2_COPY_ARR6 *) __dest) =		      \
			  ((__STRING2_COPY_ARR6) { { (src)[0], (src)[1],      \
						     (src)[2], (src)[3],      \
						     (src)[4], '\0' } });     \
			break;						      \
		      case 7:						      \
			*((__STRING2_COPY_ARR7 *) __dest) =		      \
			  ((__STRING2_COPY_ARR7) { { (src)[0], (src)[1],      \
						     (src)[2], (src)[3],      \
						     (src)[4], (src)[5],      \
						     '\0' } });		      \
			break;						      \
		      case 8:						      \
			*((__STRING2_COPY_ARR8 *) __dest) =		      \
			  ((__STRING2_COPY_ARR8) { { (src)[0], (src)[1],      \
						     (src)[2], (src)[3],      \
						     (src)[4], (src)[5],      \
						     (src)[6], '\0' } });     \
			break;						      \
		    }							      \
		  (char *) __dest; }))
# endif
#endif


/* Copy SRC to DEST, returning pointer to final NUL byte.  */
#ifdef __USE_GNU
# ifndef _HAVE_STRING_ARCH_stpcpy
#  define __stpcpy(dest, src) \
  (__extension__ (__builtin_constant_p (src)				      \
		  ? (sizeof ((src)[0]) == 1 && strlen (src) + 1 <= 8	      \
		     ? __stpcpy_small (dest, src, strlen (src) + 1)	      \
		     : ((char *) __mempcpy (dest, src, strlen (src) + 1) - 1))\
		  : __stpcpy (dest, src)))
/* In glibc we use this function frequently but for namespace reasons
   we have to use the name `__stpcpy'.  */
#  define stpcpy(dest, src) __stpcpy (dest, src)

#  if _STRING_ARCH_unaligned
#   define __stpcpy_small(dest, src, srclen) \
  (__extension__ ({ unsigned char *__dest = (unsigned char *) (dest);	      \
		    switch (srclen)					      \
		      {							      \
		      case 1:						      \
			*__dest = '\0';					      \
			break;						      \
		      case 2:						      \
			*((__uint16_t *) __dest) =			      \
			  __STRING2_SMALL_GET16 (src, 0);		      \
			++__dest;					      \
			break;						      \
		      case 3:						      \
			*((__uint16_t *) __dest) =			      \
			  __STRING2_SMALL_GET16 (src, 0);		      \
			__dest += sizeof (__uint16_t);			      \
			*__dest = '\0';					      \
			break;						      \
		      case 4:						      \
			*((__uint32_t *) __dest) =			      \
			  __STRING2_SMALL_GET32 (src, 0);		      \
			__dest += 3;					      \
			break;						      \
		      case 5:						      \
			*((__uint32_t *) __dest) =			      \
			  __STRING2_SMALL_GET32 (src, 0);		      \
			__dest += sizeof (__uint32_t);			      \
			*__dest = '\0';					      \
			break;						      \
		      case 6:						      \
			*((__uint32_t *) __dest) =			      \
			  __STRING2_SMALL_GET32 (src, 0);		      \
			*((__uint16_t *) (__dest + 4)) =		      \
			  __STRING2_SMALL_GET16 (src, 4);		      \
			__dest += 5;					      \
			break;						      \
		      case 7:						      \
			*((__uint32_t *) __dest) =			      \
			  __STRING2_SMALL_GET32 (src, 0);		      \
			*((__uint16_t *) (__dest + 4)) =		      \
			  __STRING2_SMALL_GET16 (src, 4);		      \
			__dest += 6;					      \
			*__dest = '\0';					      \
			break;						      \
		      case 8:						      \
			*((__uint32_t *) __dest) =			      \
			  __STRING2_SMALL_GET32 (src, 0);		      \
			*((__uint32_t *) (__dest + 4)) =		      \
			  __STRING2_SMALL_GET32 (src, 4);		      \
			__dest += 7;					      \
			break;						      \
		      }							      \
		    (char *) __dest; }))
#  else
#   define __stpcpy_small(dest, src, srclen) \
  (__extension__ ({ unsigned char *__dest = (unsigned char *) (dest);	      \
		    switch (srclen)					      \
		      {							      \
		      case 1:						      \
			*__dest = '\0';					      \
			break;						      \
		      case 2:						      \
			*((__STRING2_COPY_ARR2 *) __dest) =		      \
			  ((__STRING2_COPY_ARR2) { { (src)[0], '\0' } });     \
			break;						      \
		      case 3:						      \
			*((__STRING2_COPY_ARR3 *) __dest) =		      \
			  ((__STRING2_COPY_ARR3) { { (src)[0], (src)[1],      \
						     '\0' } });		      \
			break;						      \
		      case 4:						      \
			*((__STRING2_COPY_ARR4 *) __dest) =		      \
			  ((__STRING2_COPY_ARR4) { { (src)[0], (src)[1],      \
						     (src)[2], '\0' } });     \
			break;						      \
		      case 5:						      \
			*((__STRING2_COPY_ARR5 *) __dest) =		      \
			  ((__STRING2_COPY_ARR5) { { (src)[0], (src)[1],      \
						     (src)[2], (src)[3],      \
						     '\0' } });		      \
			break;						      \
		      case 6:						      \
			*((__STRING2_COPY_ARR6 *) __dest) =		      \
			  ((__STRING2_COPY_ARR6) { { (src)[0], (src)[1],      \
						     (src)[2], (src)[3],      \
						     (src)[4], '\0' } });     \
			break;						      \
		      case 7:						      \
			*((__STRING2_COPY_ARR7 *) __dest) =		      \
			  ((__STRING2_COPY_ARR7) { { (src)[0], (src)[1],      \
						     (src)[2], (src)[3],      \
						     (src)[4], (src)[5],      \
						     '\0' } });		      \
			break;						      \
		      case 8:						      \
			*((__STRING2_COPY_ARR8 *) __dest) =		      \
			  ((__STRING2_COPY_ARR8) { { (src)[0], (src)[1],      \
						     (src)[2], (src)[3],      \
						     (src)[4], (src)[5],      \
						     (src)[6], '\0' } });     \
			break;						      \
		    }							      \
		  (char *) (__dest + ((srclen) - 1)); }))
#  endif
# endif
#endif


/* Copy no more than N characters of SRC to DEST.  */
#ifndef _HAVE_STRING_ARCH_strncpy
# if defined _HAVE_STRING_ARCH_memset && defined _HAVE_STRING_ARCH_mempcpy
#  define strncpy(dest, src, n) \
  (__extension__ ({ char *__dest = (dest);				      \
		    __builtin_constant_p (src) && __builtin_constant_p (n)    \
		    ? (strlen (src) + 1 >= ((size_t) (n))		      \
		       ? (char *) memcpy (__dest, src, n)		      \
		       : (memset (__mempcpy (__dest, src, strlen (src)),      \
				  '\0', n - strlen (src)),		      \
			  __dest))					      \
		    : strncpy (__dest, src, n); }))
# else
#  define strncpy(dest, src, n) \
  (__extension__ (__builtin_constant_p (src) && __builtin_constant_p (n)      \
		  ? (strlen (src) + 1 >= ((size_t) (n))			      \
		     ? (char *) memcpy (dest, src, n)			      \
		     : strncpy (dest, src, n))				      \
		  : strncpy (dest, src, n)))
# endif
#endif


/* Append no more than N characters from SRC onto DEST.  */
#ifndef _HAVE_STRING_ARCH_strncat
# ifdef _HAVE_STRING_ARCH_strchr
#  define strncat(dest, src, n) \
  (__extension__ ({ char *__dest = (dest);				      \
		    __builtin_constant_p (src) && __builtin_constant_p (n)    \
		    ? (strlen (src) < ((size_t) (n))			      \
		       ? strcat (__dest, src)				      \
		       : (memcpy (strchr (__dest, '\0'), src, n), __dest))    \
		    : strncat (dest, src, n); }))
# else
#  define strncat(dest, src, n) \
  (__extension__ (__builtin_constant_p (src) && __builtin_constant_p (n)      \
		  ? (strlen (src) < ((size_t) (n))			      \
		     ? strcat (dest, src)				      \
		     : strncat (dest, src, n))				      \
		  : strncat (dest, src, n)))
# endif
#endif


/* Compare characters of S1 and S2.  */
#ifndef _HAVE_STRING_ARCH_strcmp
# define strcmp(s1, s2) \
  (__extension__ (__builtin_constant_p (s1) && __builtin_constant_p (s2)      \
		  && (sizeof ((s1)[0]) != 1 || strlen (s1) >= 4)	      \
		  && (sizeof ((s2)[0]) != 1 || strlen (s2) >= 4)	      \
		  ? memcmp (s1, s2, (strlen (s1) < strlen (s2)		      \
				     ? strlen (s1) : strlen (s2)) + 1)	      \
		  : (__builtin_constant_p (s1) && sizeof ((s1)[0]) == 1	      \
		     && sizeof ((s2)[0]) == 1 && strlen (s1) < 4	      \
		     ? (__builtin_constant_p (s2)			      \
			? __strcmp_cc (s1, s2, strlen (s1))		      \
			: __strcmp_cg (s1, s2, strlen (s1)))		      \
		     : (__builtin_constant_p (s2) && sizeof ((s1)[0]) == 1    \
			&& sizeof ((s2)[0]) == 1 && strlen (s2) < 4	      \
			? (__builtin_constant_p (s1)			      \
			   ? __strcmp_cc (s1, s2, strlen (s2))		      \
			   : __strcmp_gc (s1, s2, strlen (s2)))		      \
			: strcmp (s1, s2)))))

# define __strcmp_cc(s1, s2, l) \
  (__extension__ ({ register int __result = ((unsigned char) (s1)[0]	      \
					     - (unsigned char) (s2)[0]);      \
		    if (l > 0 && __result == 0)				      \
		      {							      \
			__result = ((unsigned char) (s1)[1]		      \
				    - (unsigned char) (s2)[1]);		      \
			if (l > 1 && __result == 0)			      \
			  {						      \
			    __result = ((unsigned char) (s1)[2]		      \
					- (unsigned char) (s2)[2]);	      \
			    if (l > 2 && __result == 0)			      \
			      __result = ((unsigned char) (s1)[3]	      \
					  - (unsigned char) (s2)[3]);	      \
			  }						      \
		      }							      \
		    __result; }))

# define __strcmp_cg(s1, s2, l1) \
  (__extension__ ({ __const unsigned char *__s2 = (unsigned char *) (s2);     \
		    register int __result = (unsigned char) (s1)[0] - __s2[0];\
		    if (l1 > 0 && __result == 0)			      \
		      {							      \
			__result = (unsigned char) (s1)[1] - __s2[1];	      \
			if (l1 > 1 && __result == 0)			      \
			  {						      \
			    __result = (unsigned char) (s1)[2] - __s2[2];     \
			    if (l1 > 2 && __result == 0)		      \
			      __result = (unsigned char) (s1)[3] - __s2[3];   \
			  }						      \
		      }							      \
		    __result; }))

# define __strcmp_gc(s1, s2, l2) \
  (__extension__ ({ __const unsigned char *__s1 = (unsigned char *) (s1);     \
		    register int __result = __s1[0] - (unsigned char) (s2)[0];\
		    if (l2 > 0 && __result == 0)			      \
		      {							      \
			__result = __s1[1] - (unsigned char) (s2)[1];	      \
			if (l2 > 1 && __result == 0)			      \
			  {						      \
			    __result = __s1[2] - (unsigned char) (s2)[2];     \
			    if (l2 > 2 && __result == 0)		      \
			      __result = __s1[3] - (unsigned char) (s2)[3];   \
			  }						      \
		      }							      \
		    __result; }))
#endif


/* Compare N characters of S1 and S2.  */
#ifndef _HAVE_STRING_ARCH_strncmp
# define strncmp(s1, s2, n) \
  (__extension__ (__builtin_constant_p (s1) && strlen (s1) < ((size_t) (n))   \
		  ? strcmp (s1, s2)					      \
		  : (__builtin_constant_p (s2) && strlen (s2) < ((size_t) (n))\
		     ? strcmp (s1, s2)					      \
		     : strncmp (s1, s2, n))))
#endif


/* Return the length of the initial segment of S which
   consists entirely of characters not in REJECT.  */
#ifndef _HAVE_STRING_ARCH_strcspn
# define strcspn(s, reject) \
  (__extension__ (__builtin_constant_p (reject) && sizeof ((reject)[0]) == 1  \
		  ? ((reject)[0] == '\0'				      \
		     ? strlen (s)					      \
		     : ((reject)[1] == '\0'				      \
			? __strcspn_c1 (s, (reject)[0])			      \
			: strcspn (s, reject)))				      \
		  : strcspn (s, reject)))

__STRING_INLINE size_t __strcspn_c1 (__const char *__s, char __reject);
__STRING_INLINE size_t
__strcspn_c1 (__const char *__s, char __reject)
{
  register size_t __result = 0;
  while (__s[__result] != '\0' && __s[__result] != __reject)
    ++__result;
  return __result;
}
#endif


/* Return the length of the initial segment of S which
   consists entirely of characters in ACCEPT.  */
#ifndef _HAVE_STRING_ARCH_strspn
# define strspn(s, accept) \
  (__extension__ (__builtin_constant_p (accept) && sizeof ((accept)[0]) == 1  \
		  ? ((accept)[0] == '\0'				      \
		     ? 0						      \
		     : ((accept)[1] == '\0'				      \
			? __strspn_c1 (s, (accept)[0])			      \
			: strspn (s, accept)))				      \
		  : strspn (s, accept)))

__STRING_INLINE size_t __strspn_c1 (__const char *__s, char __accept);
__STRING_INLINE size_t
__strspn_c1 (__const char *__s, char __accept)
{
  register size_t __result = 0;
  /* Please note that __accept never can be '\0'.  */
  while (__s[__result] == __accept)
    ++__result;
  return __result;
}
#endif


/* Find the first occurrence in S of any character in ACCEPT.  */
#ifndef _HAVE_STRING_ARCH_strpbrk
# define strpbrk(s, accept) \
  (__extension__ (__builtin_constant_p (accept) && sizeof ((accept)[0]) == 1  \
		  ? ((accept)[0] == '\0'				      \
		     ? NULL						      \
		     : ((accept)[1] == '\0'				      \
			? strchr (s, (accept)[0])			      \
			: strpbrk (s, accept)))				      \
		  : strpbrk (s, accept)))
#endif


/* Find the first occurrence of NEEDLE in HAYSTACK.  */
#ifndef _HAVE_STRING_ARCH_strstr
# define strstr(haystack, needle) \
  (__extension__ (__builtin_constant_p (needle) && sizeof ((needle)[0]) == 1  \
		  ? ((needle)[0] == '\0'				      \
		     ? haystack						      \
		     : ((needle)[1] == '\0'				      \
			? strchr (haystack, (needle)[0])		      \
			: strstr (haystack, needle)))			      \
		  : strstr (haystack, needle)))
#endif


#ifdef __USE_GNU
# ifndef _HAVE_STRING_ARCH_strnlen
__STRING_INLINE size_t strnlen (__const char *__string, size_t __maxlen);
__STRING_INLINE size_t
strnlen (__const char *__string, size_t __maxlen)
{
  __const char *__end = (__const char *) memchr (__string, '\0', __maxlen);
  return __end ? __end - __string : __maxlen;
}
# endif
#endif


#ifdef __USE_BSD
# ifndef _HAVE_STRING_ARCH_strsep

#  define strsep(s, reject) \
  (__extension__ (__builtin_constant_p (reject) && sizeof ((reject)[0]) == 1  \
		  ? ((reject)[0] != '\0' && (reject)[1] == '\0'		      \
		     ? __strsep_1c (s, (reject)[0])			      \
		     : __strsep_g (s, reject))				      \
		  : __strsep_g (s, reject)))

__STRING_INLINE char *__strsep_1c (char **__s, char __reject);
__STRING_INLINE char *
__strsep_1c (char **__s, char __reject)
{
  register char *__retval = *__s;
  if (__retval == NULL || *__retval == '\0')
    return NULL;
  while (*__retval == __reject)
    ++__retval;
  if ((*__s = strchr (__retval, __reject)) != NULL)
    *(*__s)++ = '\0';
  return __retval;
}

__STRING_INLINE char *__strsep_g (char **__s, __const char *__reject);
__STRING_INLINE char *
__strsep_g (char **__s, __const char *__reject)
{
  register char *__retval = *__s;
  if (__retval == NULL || *__retval == '\0')
    return NULL;
  if ((*__s = strpbrk (__retval, __reject)) != NULL)
    *(*__s)++ = '\0';
  return __retval;
}
# endif
#endif


#undef __STRING_INLINE

#endif /* No string inlines.  */