1 /* vi: set sw=4 ts=4: */
2 /*
3 * Copyright 2006, Bernhard Reutner-Fischer
4 *
5 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
6 */
7 #ifndef BB_PLATFORM_H
8 #define BB_PLATFORM_H 1
9
10
11 /* Convenience macros to test the version of gcc. */
12 #undef __GNUC_PREREQ
13 #if defined __GNUC__ && defined __GNUC_MINOR__
14 # define __GNUC_PREREQ(maj, min) \
15 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
16 #else
17 # define __GNUC_PREREQ(maj, min) 0
18 #endif
19
20 /* __restrict is known in EGCS 1.2 and above. */
21 #if !__GNUC_PREREQ(2,92)
22 # ifndef __restrict
23 # define __restrict
24 # endif
25 #endif
26
27 #if !__GNUC_PREREQ(2,7)
28 # ifndef __attribute__
29 # define __attribute__(x)
30 # endif
31 #endif
32
33 #if !__GNUC_PREREQ(5,0)
34 # define deprecated(msg) deprecated
35 #endif
36
37 #undef inline
38 #if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L
39 /* it's a keyword */
40 #elif __GNUC_PREREQ(2,7)
41 # define inline __inline__
42 #else
43 # define inline
44 #endif
45
46 #ifndef __const
47 # define __const const
48 #endif
49
50 #define UNUSED_PARAM __attribute__ ((__unused__))
51 #define NORETURN __attribute__ ((__noreturn__))
52
53 #if __GNUC_PREREQ(4,5)
54 # define bb_unreachable(altcode) __builtin_unreachable()
55 #else
56 # define bb_unreachable(altcode) altcode
57 #endif
58
59 /* "The malloc attribute is used to tell the compiler that a function
60 * may be treated as if any non-NULL pointer it returns cannot alias
61 * any other pointer valid when the function returns. This will often
62 * improve optimization. Standard functions with this property include
63 * malloc and calloc. realloc-like functions have this property as long
64 * as the old pointer is never referred to (including comparing it
65 * to the new pointer) after the function returns a non-NULL value."
66 */
67 #define RETURNS_MALLOC __attribute__ ((malloc))
68 #define PACKED __attribute__ ((__packed__))
69 #define ALIGNED(m) __attribute__ ((__aligned__(m)))
70
71 /* __NO_INLINE__: some gcc's do not honor inlining! :( */
72 #if __GNUC_PREREQ(3,0) && !defined(__NO_INLINE__)
73 # define ALWAYS_INLINE __attribute__ ((always_inline)) inline
74 /* I've seen a toolchain where I needed __noinline__ instead of noinline */
75 # define NOINLINE __attribute__((__noinline__))
76 # if !ENABLE_WERROR
77 # define DEPRECATED __attribute__ ((__deprecated__))
78 # define UNUSED_PARAM_RESULT __attribute__ ((warn_unused_result))
79 # else
80 # define DEPRECATED
81 # define UNUSED_PARAM_RESULT
82 # endif
83 #else
84 # define ALWAYS_INLINE inline
85 # define NOINLINE
86 # define DEPRECATED
87 # define UNUSED_PARAM_RESULT
88 #endif
89
90 /* used by unit test machinery to run registration functions before calling main() */
91 #define INIT_FUNC __attribute__ ((constructor))
92
93 /* -fwhole-program makes all symbols local. The attribute externally_visible
94 * forces a symbol global. */
95 #if __GNUC_PREREQ(4,1)
96 # define EXTERNALLY_VISIBLE __attribute__(( visibility("default") ))
97 //__attribute__ ((__externally_visible__))
98 #else
99 # define EXTERNALLY_VISIBLE
100 #endif
101
102 /* At 4.4 gcc become much more anal about this, need to use "aliased" types */
103 #if __GNUC_PREREQ(4,4)
104 # define FIX_ALIASING __attribute__((__may_alias__))
105 #else
106 # define FIX_ALIASING
107 #endif
108
109 /* We use __extension__ in some places to suppress -pedantic warnings
110 * about GCC extensions. This feature didn't work properly before
111 * gcc 2.8. */
112 #if !__GNUC_PREREQ(2,8)
113 # ifndef __extension__
114 # define __extension__
115 # endif
116 #endif
117
118 /* FAST_FUNC is a qualifier which (possibly) makes function call faster
119 * and/or smaller by using modified ABI. It is usually only needed
120 * on non-static, busybox internal functions. Recent versions of gcc
121 * optimize statics automatically. FAST_FUNC on static is required
122 * only if you need to match a function pointer's type.
123 * FAST_FUNC may not work well with -flto so allow user to disable this.
124 * (-DFAST_FUNC= )
125 */
126 #ifndef FAST_FUNC
127 # if __GNUC_PREREQ(3,0) && defined(i386)
128 /* stdcall makes callee to pop arguments from stack, not caller */
129 # define FAST_FUNC __attribute__((regparm(3),stdcall))
130 /* #elif ... - add your favorite arch today! */
131 # else
132 # define FAST_FUNC
133 # endif
134 #endif
135
136 /* Make all declarations hidden (-fvisibility flag only affects definitions) */
137 /* (don't include system headers after this until corresponding pop!) */
138 #if __GNUC_PREREQ(4,1) && !defined(__CYGWIN__)
139 # define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN _Pragma("GCC visibility push(hidden)")
140 # define POP_SAVED_FUNCTION_VISIBILITY _Pragma("GCC visibility pop")
141 #else
142 # define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
143 # define POP_SAVED_FUNCTION_VISIBILITY
144 #endif
145
146 /* gcc-2.95 had no va_copy but only __va_copy. */
147 #if !__GNUC_PREREQ(3,0)
148 # include <stdarg.h>
149 # if !defined va_copy && defined __va_copy
150 # define va_copy(d,s) __va_copy((d),(s))
151 # endif
152 #endif
153
154
155 /* ---- Endian Detection ------------------------------------ */
156
157 #include <limits.h>
158 #if defined(__digital__) && defined(__unix__)
159 # include <sex.h>
160 #elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
161 || defined(__APPLE__)
162 # include <sys/resource.h> /* rlimit */
163 # include <machine/endian.h>
164 # define bswap_64 __bswap64
165 # define bswap_32 __bswap32
166 # define bswap_16 __bswap16
167 #else
168 # include <byteswap.h>
169 # include <endian.h>
170 #endif
171
172 #if defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN
173 # define BB_BIG_ENDIAN 1
174 # define BB_LITTLE_ENDIAN 0
175 #elif defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN
176 # define BB_BIG_ENDIAN 0
177 # define BB_LITTLE_ENDIAN 1
178 #elif defined(_BYTE_ORDER) && _BYTE_ORDER == _BIG_ENDIAN
179 # define BB_BIG_ENDIAN 1
180 # define BB_LITTLE_ENDIAN 0
181 #elif defined(_BYTE_ORDER) && _BYTE_ORDER == _LITTLE_ENDIAN
182 # define BB_BIG_ENDIAN 0
183 # define BB_LITTLE_ENDIAN 1
184 #elif defined(BYTE_ORDER) && BYTE_ORDER == BIG_ENDIAN
185 # define BB_BIG_ENDIAN 1
186 # define BB_LITTLE_ENDIAN 0
187 #elif defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN
188 # define BB_BIG_ENDIAN 0
189 # define BB_LITTLE_ENDIAN 1
190 #elif defined(__386__)
191 # define BB_BIG_ENDIAN 0
192 # define BB_LITTLE_ENDIAN 1
193 #else
194 # error "Can't determine endianness"
195 #endif
196
197 #if ULONG_MAX > 0xffffffff
198 /* inline 64-bit bswap only on 64-bit arches */
199 # define bb_bswap_64(x) bswap_64(x)
200 #endif
201
202 /* SWAP_LEnn means "convert CPU<->little_endian by swapping bytes" */
203 #if BB_BIG_ENDIAN
204 # define SWAP_BE16(x) (x)
205 # define SWAP_BE32(x) (x)
206 # define SWAP_BE64(x) (x)
207 # define SWAP_LE16(x) bswap_16(x)
208 # define SWAP_LE32(x) bswap_32(x)
209 # define SWAP_LE64(x) bb_bswap_64(x)
210 # define IF_BIG_ENDIAN(...) __VA_ARGS__
211 # define IF_LITTLE_ENDIAN(...)
212 #else
213 # define SWAP_BE16(x) bswap_16(x)
214 # define SWAP_BE32(x) bswap_32(x)
215 # define SWAP_BE64(x) bb_bswap_64(x)
216 # define SWAP_LE16(x) (x)
217 # define SWAP_LE32(x) (x)
218 # define SWAP_LE64(x) (x)
219 # define IF_BIG_ENDIAN(...)
220 # define IF_LITTLE_ENDIAN(...) __VA_ARGS__
221 #endif
222
223
224 /* ---- Unaligned access ------------------------------------ */
225
226 #include <stdint.h>
227 typedef int bb__aliased_int FIX_ALIASING;
228 typedef long bb__aliased_long FIX_ALIASING;
229 typedef uint16_t bb__aliased_uint16_t FIX_ALIASING;
230 typedef uint32_t bb__aliased_uint32_t FIX_ALIASING;
231 typedef uint64_t bb__aliased_uint64_t FIX_ALIASING;
232
233 /* NB: unaligned parameter should be a pointer, aligned one -
234 * a lvalue. This makes it more likely to not swap them by mistake
235 */
236 #if defined(i386) || defined(__x86_64__) || defined(__powerpc__)
237 # define BB_UNALIGNED_MEMACCESS_OK 1
238 # define move_from_unaligned_int(v, intp) ((v) = *(bb__aliased_int*)(intp))
239 # define move_from_unaligned_long(v, longp) ((v) = *(bb__aliased_long*)(longp))
240 # define move_from_unaligned16(v, u16p) ((v) = *(bb__aliased_uint16_t*)(u16p))
241 # define move_from_unaligned32(v, u32p) ((v) = *(bb__aliased_uint32_t*)(u32p))
242 # define move_from_unaligned64(v, u64p) ((v) = *(bb__aliased_uint64_t*)(u64p))
243 # define move_to_unaligned16(u16p, v) (*(bb__aliased_uint16_t*)(u16p) = (v))
244 # define move_to_unaligned32(u32p, v) (*(bb__aliased_uint32_t*)(u32p) = (v))
245 # define move_to_unaligned64(u64p, v) (*(bb__aliased_uint64_t*)(u64p) = (v))
246 /* #elif ... - add your favorite arch today! */
247 #else
248 # define BB_UNALIGNED_MEMACCESS_OK 0
249 /* performs reasonably well (gcc usually inlines memcpy here) */
250 # define move_from_unaligned_int(v, intp) (memcpy(&(v), (intp), sizeof(int)))
251 # define move_from_unaligned_long(v, longp) (memcpy(&(v), (longp), sizeof(long)))
252 # define move_from_unaligned16(v, u16p) (memcpy(&(v), (u16p), 2))
253 # define move_from_unaligned32(v, u32p) (memcpy(&(v), (u32p), 4))
254 # define move_from_unaligned64(v, u64p) (memcpy(&(v), (u64p), 8))
255 # define move_to_unaligned16(u16p, v) do { \
256 uint16_t __t = (v); \
257 memcpy((u16p), &__t, 2); \
258 } while (0)
259 # define move_to_unaligned32(u32p, v) do { \
260 uint32_t __t = (v); \
261 memcpy((u32p), &__t, 4); \
262 } while (0)
263 # define move_to_unaligned64(u64p, v) do { \
264 uint64_t __t = (v); \
265 memcpy((u64p), &__t, 8); \
266 } while (0)
267 #endif
268
269 /* Unaligned, fixed-endian accessors */
270 #define get_unaligned_le32(buf) ({ uint32_t v; move_from_unaligned32(v, buf); SWAP_LE32(v); })
271 #define get_unaligned_be32(buf) ({ uint32_t v; move_from_unaligned32(v, buf); SWAP_BE32(v); })
272 #define put_unaligned_le32(val, buf) move_to_unaligned32(buf, SWAP_LE32(val))
273 #define put_unaligned_be32(val, buf) move_to_unaligned32(buf, SWAP_BE32(val))
274
275 /* unxz needs an aligned fixed-endian accessor.
276 * (however, the compiler does not realize it's aligned, the cast is still necessary)
277 */
278 #define get_le32(u32p) ({ uint32_t v = *(bb__aliased_uint32_t*)(u32p); SWAP_LE32(v); })
279
280
281 /* ---- Size-saving "small" ints (arch-dependent) ----------- */
282
283 #if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__)
284 /* add other arches which benefit from this... */
285 typedef signed char smallint;
286 typedef unsigned char smalluint;
287 #else
288 /* for arches where byte accesses generate larger code: */
289 typedef int smallint;
290 typedef unsigned smalluint;
291 #endif
292
293 /* ISO C Standard: 7.16 Boolean type and values <stdbool.h> */
294 #if (defined __digital__ && defined __unix__)
295 /* old system without (proper) C99 support */
296 # define bool smalluint
297 #else
298 /* modern system, so use it */
299 # include <stdbool.h>
300 #endif
301
302
303 /*----- Kernel versioning ------------------------------------*/
304
305 #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
306
307 #ifdef __UCLIBC__
308 # define UCLIBC_VERSION KERNEL_VERSION(__UCLIBC_MAJOR__, __UCLIBC_MINOR__, __UCLIBC_SUBLEVEL__)
309 #else
310 # define UCLIBC_VERSION 0
311 #endif
312
313
314 /* ---- Miscellaneous --------------------------------------- */
315
316 #if defined __GLIBC__ \
317 || defined __UCLIBC__ \
318 || defined __dietlibc__ \
319 || defined __BIONIC__ \
320 || defined _NEWLIB_VERSION
321 # include <features.h>
322 #endif
323
324 /* Define bb_setpgrp */
325 #if (defined(__digital__) && defined(__unix__)) || defined(__FreeBSD__)
326 /* use legacy setpgrp(pid_t, pid_t) for now. move to platform.c */
327 # define bb_setpgrp() do { pid_t __me = getpid(); setpgrp(__me, __me); } while (0)
328 #else
329 # define bb_setpgrp() setpgrp()
330 #endif
331
332 /* fdprintf is more readable, we used it before dprintf was standardized */
333 #include <unistd.h>
334 #define fdprintf dprintf
335
336 /* Useful for defeating gcc's alignment of "char message[]"-like data */
337 #if !defined(__s390__)
338 /* on s390[x], non-word-aligned data accesses require larger code */
339 # define ALIGN1 __attribute__((aligned(1)))
340 # define ALIGN2 __attribute__((aligned(2)))
341 # define ALIGN4 __attribute__((aligned(4)))
342 #else
343 /* Arches which MUST have 2 or 4 byte alignment for everything are here */
344 # define ALIGN1
345 # define ALIGN2
346 # define ALIGN4
347 #endif
348 #define ALIGN8 __attribute__((aligned(8)))
349 #define ALIGN_PTR __attribute__((aligned(sizeof(void*))))
350
351 /*
352 * For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably.
353 * For earlier versions there is no reliable way to check if we are building
354 * for a mmu-less system.
355 */
356 #if ENABLE_NOMMU || \
357 (defined __UCLIBC__ && \
358 UCLIBC_VERSION > KERNEL_VERSION(0, 9, 28) && \
359 !defined __ARCH_USE_MMU__)
360 # define BB_MMU 0
361 # define USE_FOR_NOMMU(...) __VA_ARGS__
362 # define USE_FOR_MMU(...)
363 #else
364 # define BB_MMU 1
365 # define USE_FOR_NOMMU(...)
366 # define USE_FOR_MMU(...) __VA_ARGS__
367 #endif
368
369 #if defined(__digital__) && defined(__unix__)
370 # include <standards.h>
371 # include <inttypes.h>
372 # define PRIu32 "u"
373 # if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET
374 # define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET)
375 # endif
376 # if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY
377 # define ADJ_FREQUENCY MOD_FREQUENCY
378 # endif
379 # if !defined ADJ_TIMECONST && defined MOD_TIMECONST
380 # define ADJ_TIMECONST MOD_TIMECONST
381 # endif
382 # if !defined ADJ_TICK && defined MOD_CLKB
383 # define ADJ_TICK MOD_CLKB
384 # endif
385 #endif
386
387 #if defined(__CYGWIN__)
388 # define MAXSYMLINKS SYMLOOP_MAX
389 #endif
390
391 #if defined(ANDROID) || defined(__ANDROID__)
392 # define BB_ADDITIONAL_PATH ":/system/sbin:/system/bin:/system/xbin"
393 # define SYS_ioprio_set __NR_ioprio_set
394 # define SYS_ioprio_get __NR_ioprio_get
395 #endif
396
397
398 /* ---- Who misses what? ------------------------------------ */
399
400 /* Assume all these functions and header files exist by default.
401 * Platforms where it is not true will #undef them below.
402 */
403 #define HAVE_CLEARENV 1
404 #define HAVE_FDATASYNC 1
405 #define HAVE_DPRINTF 1
406 #define HAVE_MEMRCHR 1
407 #define HAVE_MKDTEMP 1
408 #define HAVE_TTYNAME_R 1
409 #define HAVE_PTSNAME_R 1
410 #define HAVE_SETBIT 1
411 #define HAVE_SIGHANDLER_T 1
412 #define HAVE_STPCPY 1
413 #define HAVE_STPNCPY 1
414 #define HAVE_MEMPCPY 1
415 #define HAVE_STRCASESTR 1
416 #define HAVE_STRCHRNUL 1
417 #define HAVE_STRSEP 1
418 #define HAVE_STRSIGNAL 1
419 #define HAVE_STRVERSCMP 1
420 #define HAVE_VASPRINTF 1
421 #define HAVE_USLEEP 1
422 #define HAVE_UNLOCKED_STDIO 1
423 #define HAVE_UNLOCKED_LINE_OPS 1
424 #define HAVE_GETLINE 1
425 #define HAVE_XTABS 1
426 #define HAVE_MNTENT_H 1
427 #define HAVE_NET_ETHERNET_H 1
428 #define HAVE_SYS_STATFS_H 1
429 #define HAVE_PRINTF_PERCENTM 1
430 #define HAVE_WAIT3 1
431 #define HAVE_DEV_FD 1
432 #define DEV_FD_PREFIX "/dev/fd/"
433
434 #if defined(__UCLIBC__)
435 # if UCLIBC_VERSION < KERNEL_VERSION(0, 9, 32)
436 # undef HAVE_STRVERSCMP
437 # endif
438 # if UCLIBC_VERSION >= KERNEL_VERSION(0, 9, 30)
439 # ifndef __UCLIBC_SUSV3_LEGACY__
440 # undef HAVE_USLEEP
441 # endif
442 # endif
443 #endif
444
445 #if defined(__WATCOMC__)
446 # undef HAVE_DPRINTF
447 # undef HAVE_GETLINE
448 # undef HAVE_MEMRCHR
449 # undef HAVE_MKDTEMP
450 # undef HAVE_SETBIT
451 # undef HAVE_STPCPY
452 # undef HAVE_STPNCPY
453 # undef HAVE_STRCASESTR
454 # undef HAVE_STRCHRNUL
455 # undef HAVE_STRSEP
456 # undef HAVE_STRSIGNAL
457 # undef HAVE_STRVERSCMP
458 # undef HAVE_VASPRINTF
459 # undef HAVE_UNLOCKED_STDIO
460 # undef HAVE_UNLOCKED_LINE_OPS
461 # undef HAVE_NET_ETHERNET_H
462 #endif
463
464 #if defined(__CYGWIN__)
465 # undef HAVE_CLEARENV
466 # undef HAVE_FDPRINTF
467 # undef HAVE_MEMRCHR
468 # undef HAVE_PTSNAME_R
469 # undef HAVE_STRVERSCMP
470 # undef HAVE_UNLOCKED_LINE_OPS
471 #endif
472
473 /* These BSD-derived OSes share many similarities */
474 #if (defined __digital__ && defined __unix__) \
475 || defined __APPLE__ \
476 || defined __OpenBSD__ || defined __NetBSD__
477 # undef HAVE_CLEARENV
478 # undef HAVE_FDATASYNC
479 # undef HAVE_GETLINE
480 # undef HAVE_MNTENT_H
481 # undef HAVE_PTSNAME_R
482 # undef HAVE_SYS_STATFS_H
483 # undef HAVE_SIGHANDLER_T
484 # undef HAVE_STRVERSCMP
485 # undef HAVE_XTABS
486 # undef HAVE_DPRINTF
487 # undef HAVE_UNLOCKED_STDIO
488 # undef HAVE_UNLOCKED_LINE_OPS
489 # undef HAVE_PRINTF_PERCENTM
490 #endif
491
492 #if defined(__dietlibc__)
493 # undef HAVE_STRCHRNUL
494 #endif
495
496 #if defined(__APPLE__)
497 # undef HAVE_STRCHRNUL
498 #endif
499
500 #if defined(__FreeBSD__)
501 /* users say mempcpy is not present in FreeBSD 9.x */
502 # undef HAVE_MEMPCPY
503 # undef HAVE_CLEARENV
504 # undef HAVE_FDATASYNC
505 # undef HAVE_MNTENT_H
506 # undef HAVE_PTSNAME_R
507 # undef HAVE_SYS_STATFS_H
508 # undef HAVE_SIGHANDLER_T
509 # undef HAVE_STRVERSCMP
510 # undef HAVE_XTABS
511 # undef HAVE_UNLOCKED_LINE_OPS
512 # undef HAVE_PRINTF_PERCENTM
513 # include <osreldate.h>
514 # if __FreeBSD_version < 1000029
515 # undef HAVE_STRCHRNUL /* FreeBSD added strchrnul() between 1000028 and 1000029 */
516 # endif
517 #endif
518
519 #if defined(__NetBSD__)
520 # define HAVE_GETLINE 1 /* Recent NetBSD versions have getline() */
521 #endif
522
523 #if defined(__digital__) && defined(__unix__)
524 # undef HAVE_STPCPY
525 # undef HAVE_STPNCPY
526 #endif
527
528 #if defined(ANDROID) || defined(__ANDROID__)
529 # if __ANDROID_API__ < 8
530 /* ANDROID < 8 has no [f]dprintf at all */
531 # undef HAVE_DPRINTF
532 # elif __ANDROID_API__ < 21
533 /* ANDROID < 21 has fdprintf */
534 # define dprintf fdprintf
535 # else
536 /* ANDROID >= 21 has standard dprintf */
537 # endif
538 # if __ANDROID_API__ < 21
539 # undef HAVE_TTYNAME_R
540 # undef HAVE_GETLINE
541 # undef HAVE_STPCPY
542 # undef HAVE_STPNCPY
543 # endif
544 # if __ANDROID_API__ >= 21
545 # undef HAVE_WAIT3
546 # endif
547 # undef HAVE_MEMPCPY
548 # undef HAVE_STRCHRNUL
549 # undef HAVE_STRVERSCMP
550 # undef HAVE_UNLOCKED_LINE_OPS
551 # undef HAVE_NET_ETHERNET_H
552 # undef HAVE_PRINTF_PERCENTM
553 #endif
554
555 /*
556 * Now, define prototypes for all the functions defined in platform.c
557 * These must come after all the HAVE_* macros are defined (or not)
558 */
559
560 #ifndef HAVE_DPRINTF
561 extern int dprintf(int fd, const char *format, ...);
562 #endif
563
564 #ifndef HAVE_MEMRCHR
565 extern void *memrchr(const void *s, int c, size_t n) FAST_FUNC;
566 #endif
567
568 #ifndef HAVE_MKDTEMP
569 extern char *mkdtemp(char *template) FAST_FUNC;
570 #endif
571
572 #ifndef HAVE_TTYNAME_R
573 #define ttyname_r bb_ttyname_r
574 extern int ttyname_r(int fd, char *buf, size_t buflen);
575 #endif
576
577 #ifndef HAVE_SETBIT
578 # define setbit(a, b) ((a)[(b) >> 3] |= 1 << ((b) & 7))
579 # define clrbit(a, b) ((a)[(b) >> 3] &= ~(1 << ((b) & 7)))
580 #endif
581
582 #ifndef HAVE_SIGHANDLER_T
583 typedef void (*sighandler_t)(int);
584 #endif
585
586 #ifndef HAVE_STPCPY
587 extern char *stpcpy(char *p, const char *to_add) FAST_FUNC;
588 #endif
589
590 #ifndef HAVE_STPNCPY
591 extern char *stpncpy(char *p, const char *to_add, size_t n) FAST_FUNC;
592 #endif
593
594 #ifndef HAVE_MEMPCPY
595 #include <string.h>
596 /* In case we are wrong about !HAVE_MEMPCPY, and toolchain _does_ have
597 * mempcpy(), avoid colliding with it:
598 */
599 #define mempcpy bb__mempcpy
mempcpy(void * dest,const void * src,size_t len)600 static ALWAYS_INLINE void *mempcpy(void *dest, const void *src, size_t len)
601 {
602 return memcpy(dest, src, len) + len;
603 }
604 #endif
605
606 #ifndef HAVE_STRCASESTR
607 extern char *strcasestr(const char *s, const char *pattern) FAST_FUNC;
608 #endif
609
610 #ifndef HAVE_STRCHRNUL
611 extern char *strchrnul(const char *s, int c) FAST_FUNC;
612 #endif
613
614 #ifndef HAVE_STRSEP
615 extern char *strsep(char **stringp, const char *delim) FAST_FUNC;
616 #endif
617
618 #ifndef HAVE_STRSIGNAL
619 /* Not exactly the same: instead of "Stopped" it shows "STOP" etc */
620 # define strsignal(sig) get_signame(sig)
621 #endif
622
623 #ifndef HAVE_USLEEP
624 extern int usleep(unsigned) FAST_FUNC;
625 #endif
626
627 #ifndef HAVE_VASPRINTF
628 extern int vasprintf(char **string_ptr, const char *format, va_list p) FAST_FUNC;
629 #endif
630
631 #ifndef HAVE_GETLINE
632 # include <stdio.h> /* for FILE */
633 # include <sys/types.h> /* size_t */
634 extern ssize_t getline(char **lineptr, size_t *n, FILE *stream) FAST_FUNC;
635 #endif
636
637 #endif
638