source: trunk/src/gmake/make.h@ 657

Last change on this file since 657 was 591, checked in by bird, 19 years ago

Added --pretty-command-printing for simplifying makefile debugging.
  • Property svn:eol-style set to native
File size: 19.7 KB
Line 
1/* Miscellaneous global declarations and portability cruft for GNU Make.
2Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
31998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software
4Foundation, Inc.
5This file is part of GNU Make.
6
7GNU Make is free software; you can redistribute it and/or modify it under the
8terms of the GNU General Public License as published by the Free Software
9Foundation; either version 2, or (at your option) any later version.
10
11GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
13A PARTICULAR PURPOSE. See the GNU General Public License for more details.
14
15You should have received a copy of the GNU General Public License along with
16GNU Make; see the file COPYING. If not, write to the Free Software
17Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. */
18
19/* We use <config.h> instead of "config.h" so that a compilation
20 using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
21 (which it would do because make.h was found in $srcdir). */
22#include <config.h>
23#undef HAVE_CONFIG_H
24#define HAVE_CONFIG_H 1
25
26/* AIX requires this to be the first thing in the file. */
27#ifndef __GNUC__
28# if HAVE_ALLOCA_H
29# include <alloca.h>
30# else
31# ifdef _AIX
32 #pragma alloca
33# else
34# ifndef alloca /* predefined by HP cc +Olibcalls */
35char *alloca ();
36# endif
37# endif
38# endif
39#endif
40
41
42/* Use prototypes if available. */
43#if defined (__cplusplus) || defined (__STDC__) || defined WINDOWS32 /* bird: protos on windows */
44# undef PARAMS
45# define PARAMS(protos) protos
46#else /* Not C++ or ANSI C. */
47# undef PARAMS
48# define PARAMS(protos) ()
49#endif /* C++ or ANSI C. */
50
51/* Specify we want GNU source code. This must be defined before any
52 system headers are included. */
53
54#define _GNU_SOURCE 1
55
56
57#ifdef CRAY
58/* This must happen before #include <signal.h> so
59 that the declaration therein is changed. */
60# define signal bsdsignal
61#endif
62
63/* If we're compiling for the dmalloc debugger, turn off string inlining. */
64#if defined(HAVE_DMALLOC_H) && defined(__GNUC__)
65# define __NO_STRING_INLINES
66#endif
67
68#include <sys/types.h>
69#include <sys/stat.h>
70#include <signal.h>
71#include <stdio.h>
72#include <ctype.h>
73#ifdef HAVE_SYS_TIMEB_H
74/* SCO 3.2 "devsys 4.2" has a prototype for `ftime' in <time.h> that bombs
75 unless <sys/timeb.h> has been included first. Does every system have a
76 <sys/timeb.h>? If any does not, configure should check for it. */
77# include <sys/timeb.h>
78#endif
79
80#if TIME_WITH_SYS_TIME
81# include <sys/time.h>
82# include <time.h>
83#else
84# if HAVE_SYS_TIME_H
85# include <sys/time.h>
86# else
87# include <time.h>
88# endif
89#endif
90
91#include <errno.h>
92
93#ifndef errno
94extern int errno;
95#endif
96
97#ifndef isblank
98# define isblank(c) ((c) == ' ' || (c) == '\t')
99#endif
100
101#ifdef HAVE_UNISTD_H
102# include <unistd.h>
103/* Ultrix's unistd.h always defines _POSIX_VERSION, but you only get
104 POSIX.1 behavior with `cc -YPOSIX', which predefines POSIX itself! */
105# if defined (_POSIX_VERSION) && !defined (ultrix) && !defined (VMS)
106# define POSIX 1
107# endif
108#endif
109
110/* Some systems define _POSIX_VERSION but are not really POSIX.1. */
111#if (defined (butterfly) || defined (__arm) || (defined (__mips) && defined (_SYSTYPE_SVR3)) || (defined (sequent) && defined (i386)))
112# undef POSIX
113#endif
114
115#if !defined (POSIX) && defined (_AIX) && defined (_POSIX_SOURCE)
116# define POSIX 1
117#endif
118
119#ifndef RETSIGTYPE
120# define RETSIGTYPE void
121#endif
122
123#ifndef sigmask
124# define sigmask(sig) (1 << ((sig) - 1))
125#endif
126
127#ifndef HAVE_SA_RESTART
128# define SA_RESTART 0
129#endif
130
131#ifdef HAVE_LIMITS_H
132# include <limits.h>
133#endif
134#ifdef HAVE_SYS_PARAM_H
135# include <sys/param.h>
136#endif
137
138#ifndef PATH_MAX
139# ifndef POSIX
140# define PATH_MAX MAXPATHLEN
141# endif
142#endif
143#ifndef MAXPATHLEN
144# define MAXPATHLEN 1024
145#endif
146
147#ifdef PATH_MAX
148# define GET_PATH_MAX PATH_MAX
149# define PATH_VAR(var) char var[PATH_MAX]
150#else
151# define NEED_GET_PATH_MAX 1
152# define GET_PATH_MAX (get_path_max ())
153# define PATH_VAR(var) char *var = (char *) alloca (GET_PATH_MAX)
154extern unsigned int get_path_max PARAMS ((void));
155#endif
156
157#ifndef CHAR_BIT
158# define CHAR_BIT 8
159#endif
160
161/* Nonzero if the integer type T is signed. */
162#define INTEGER_TYPE_SIGNED(t) ((t) -1 < 0)
163
164/* The minimum and maximum values for the integer type T.
165 Use ~ (t) 0, not -1, for portability to 1's complement hosts. */
166#define INTEGER_TYPE_MINIMUM(t) \
167 (! INTEGER_TYPE_SIGNED (t) ? (t) 0 : ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))
168#define INTEGER_TYPE_MAXIMUM(t) (~ (t) 0 - INTEGER_TYPE_MINIMUM (t))
169
170#ifndef CHAR_MAX
171# define CHAR_MAX INTEGER_TYPE_MAXIMUM (char)
172#endif
173
174#ifdef STAT_MACROS_BROKEN
175# ifdef S_ISREG
176# undef S_ISREG
177# endif
178# ifdef S_ISDIR
179# undef S_ISDIR
180# endif
181#endif /* STAT_MACROS_BROKEN. */
182
183#ifndef S_ISREG
184# define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
185#endif
186#ifndef S_ISDIR
187# define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
188#endif
189
190#ifdef VMS
191# include <types.h>
192# include <unixlib.h>
193# include <unixio.h>
194# include <perror.h>
195/* Needed to use alloca on VMS. */
196# include <builtins.h>
197#endif
198
199#ifndef __attribute__
200/* This feature is available in gcc versions 2.5 and later. */
201# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5) || __STRICT_ANSI__
202# define __attribute__(x)
203# endif
204/* The __-protected variants of `format' and `printf' attributes
205 are accepted by gcc versions 2.6.4 (effectively 2.7) and later. */
206# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7)
207# define __format__ format
208# define __printf__ printf
209# endif
210#endif
211#define UNUSED __attribute__ ((unused))
212
213#if defined (STDC_HEADERS) || defined (__GNU_LIBRARY__)
214# include <stdlib.h>
215# include <string.h>
216# define ANSI_STRING 1
217#else /* No standard headers. */
218# ifdef HAVE_STRING_H
219# include <string.h>
220# define ANSI_STRING 1
221# else
222# include <strings.h>
223# endif
224# ifdef HAVE_MEMORY_H
225# include <memory.h>
226# endif
227# ifdef HAVE_STDLIB_H
228# include <stdlib.h>
229# else
230extern char *malloc PARAMS ((int));
231extern char *realloc PARAMS ((char *, int));
232extern void free PARAMS ((char *));
233
234extern void abort PARAMS ((void)) __attribute__ ((noreturn));
235extern void exit PARAMS ((int)) __attribute__ ((noreturn));
236# endif /* HAVE_STDLIB_H. */
237
238#endif /* Standard headers. */
239
240/* These should be in stdlib.h. Make sure we have them. */
241#ifndef EXIT_SUCCESS
242# define EXIT_SUCCESS 0
243#endif
244#ifndef EXIT_FAILURE
245# define EXIT_FAILURE 0
246#endif
247
248#ifdef ANSI_STRING
249
250# ifndef bcmp
251# define bcmp(s1, s2, n) memcmp ((s1), (s2), (n))
252# endif
253# ifndef bzero
254# define bzero(s, n) memset ((s), 0, (n))
255# endif
256# if defined(HAVE_MEMMOVE) && !defined(bcopy)
257# define bcopy(s, d, n) memmove ((d), (s), (n))
258# endif
259
260#else /* Not ANSI_STRING. */
261
262# ifndef HAVE_STRCHR
263# define strchr(s, c) index((s), (c))
264# define strrchr(s, c) rindex((s), (c))
265# endif
266
267# ifndef bcmp
268extern int bcmp PARAMS ((const char *, const char *, int));
269# endif
270# ifndef bzero
271extern void bzero PARAMS ((char *, int));
272#endif
273# ifndef bcopy
274extern void bcopy PARAMS ((const char *b1, char *b2, int));
275# endif
276
277/* SCO Xenix has a buggy macro definition in <string.h>. */
278#undef strerror
279#if !defined(__DECC)
280extern char *strerror PARAMS ((int errnum));
281#endif
282
283#endif /* !ANSI_STRING. */
284#undef ANSI_STRING
285
286#if HAVE_INTTYPES_H
287# include <inttypes.h>
288#endif
289#define FILE_TIMESTAMP uintmax_t
290
291#if !defined(HAVE_STRSIGNAL)
292extern char *strsignal PARAMS ((int signum));
293#endif
294
295/* ISDIGIT offers the following features:
296 - Its arg may be any int or unsigned int; it need not be an unsigned char.
297 - It's guaranteed to evaluate its argument exactly once.
298 NOTE! Make relies on this behavior, don't change it!
299 - It's typically faster.
300 POSIX 1003.2-1992 section 2.5.2.1 page 50 lines 1556-1558 says that
301 only '0' through '9' are digits. Prefer ISDIGIT to isdigit() unless
302 it's important to use the locale's definition of `digit' even when the
303 host does not conform to POSIX. */
304#define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)
305
306#ifndef iAPX286
307# define streq(a, b) \
308 ((a) == (b) || \
309 (*(a) == *(b) && (*(a) == '\0' || !strcmp ((a) + 1, (b) + 1))))
310# ifdef HAVE_CASE_INSENSITIVE_FS
311/* This is only used on Windows/DOS platforms, so we assume strcmpi(). */
312# define strieq(a, b) \
313 ((a) == (b) \
314 || (tolower((unsigned char)*(a)) == tolower((unsigned char)*(b)) \
315 && (*(a) == '\0' || !strcmpi ((a) + 1, (b) + 1))))
316# else
317# define strieq(a, b) streq(a, b)
318# endif
319#else
320/* Buggy compiler can't handle this. */
321# define streq(a, b) (strcmp ((a), (b)) == 0)
322# define strieq(a, b) (strcmp ((a), (b)) == 0)
323#endif
324#define strneq(a, b, l) (strncmp ((a), (b), (l)) == 0)
325#ifdef VMS
326extern int strcmpi (const char *,const char *);
327#endif
328
329#if defined(__GNUC__) || defined(ENUM_BITFIELDS)
330# define ENUM_BITFIELD(bits) :bits
331#else
332# define ENUM_BITFIELD(bits)
333#endif
334
335/* Handle gettext and locales. */
336
337#if HAVE_LOCALE_H
338# include <locale.h>
339#else
340# define setlocale(category, locale)
341#endif
342
343#include <gettext.h>
344
345#define _(msgid) gettext (msgid)
346#define N_(msgid) gettext_noop (msgid)
347#define S_(msg1,msg2,num) ngettext (msg1,msg2,num)
348
349/* Handle other OSs. */
350#if defined(HAVE_DOS_PATHS)
351# define PATH_SEPARATOR_CHAR ';'
352#elif defined(VMS)
353# define PATH_SEPARATOR_CHAR ','
354#else
355# define PATH_SEPARATOR_CHAR ':'
356#endif
357
358/* This is needed for getcwd() and chdir(). */
359#if defined(_MSC_VER) || defined(__BORLANDC__)
360# include <direct.h>
361#endif
362
363#ifdef WINDOWS32
364# include <fcntl.h>
365# include <malloc.h>
366# define pipe(p) _pipe(p, 512, O_BINARY)
367# define kill(pid,sig) w32_kill(pid,sig)
368
369extern void sync_Path_environment(void);
370extern int kill(int pid, int sig);
371extern char *end_of_token_w32(char *s, char stopchar);
372extern int find_and_set_default_shell(char *token);
373
374/* indicates whether or not we have Bourne shell */
375extern int no_default_sh_exe;
376
377/* is default_shell unixy? */
378extern int unixy_shell;
379#endif /* WINDOWS32 */
380
381struct floc
382 {
383 const char *filenm;
384 unsigned long lineno;
385 };
386#define NILF ((struct floc *)0)
387
388#define STRING_SIZE_TUPLE(_s) (_s), (sizeof (_s)-1)
389
390
391
392/* We have to have stdarg.h or varargs.h AND v*printf or doprnt to use
393 variadic versions of these functions. */
394
395#if HAVE_STDARG_H || HAVE_VARARGS_H
396# if HAVE_VPRINTF || HAVE_DOPRNT
397# define USE_VARIADIC 1
398# endif
399#endif
400
401#if HAVE_ANSI_COMPILER && USE_VARIADIC && HAVE_STDARG_H
402extern void message (int prefix, const char *fmt, ...)
403 __attribute__ ((__format__ (__printf__, 2, 3)));
404extern void error (const struct floc *flocp, const char *fmt, ...)
405 __attribute__ ((__format__ (__printf__, 2, 3)));
406extern void fatal (const struct floc *flocp, const char *fmt, ...)
407 __attribute__ ((noreturn, __format__ (__printf__, 2, 3)));
408#else
409extern void message ();
410extern void error ();
411extern void fatal ();
412#endif
413
414extern void die PARAMS ((int)) __attribute__ ((noreturn));
415extern void log_working_directory PARAMS ((int));
416extern void pfatal_with_name PARAMS ((const char *)) __attribute__ ((noreturn));
417extern void perror_with_name PARAMS ((const char *, const char *));
418extern char *savestring PARAMS ((const char *, unsigned int));
419extern char *concat PARAMS ((const char *, const char *, const char *));
420extern char *xmalloc PARAMS ((unsigned int));
421extern char *xrealloc PARAMS ((char *, unsigned int));
422extern char *xstrdup PARAMS ((const char *));
423extern char *find_next_token PARAMS ((char **, unsigned int *));
424extern char *next_token PARAMS ((const char *));
425extern char *end_of_token PARAMS ((const char *));
426extern void collapse_continuations PARAMS ((char *));
427#ifdef CONFIG_WITH_OPTIMIZATION_HACKS /* memchr is usually compiler intrinsic, thus faster. */
428#define lindex(s, limit, c) ((char *)memchr((s), (c), (limit) - (s)))
429#else
430extern char *lindex PARAMS ((const char *, const char *, int));
431#endif
432extern int alpha_compare PARAMS ((const void *, const void *));
433extern void print_spaces PARAMS ((unsigned int));
434extern char *find_percent PARAMS ((char *));
435extern FILE *open_tmpfile PARAMS ((char **, const char *));
436
437#ifndef NO_ARCHIVES
438extern int ar_name PARAMS ((char *));
439extern void ar_parse_name PARAMS ((char *, char **, char **));
440extern int ar_touch PARAMS ((char *));
441extern time_t ar_member_date PARAMS ((char *));
442#endif
443
444extern int dir_file_exists_p PARAMS ((char *, char *));
445extern int file_exists_p PARAMS ((char *));
446extern int file_impossible_p PARAMS ((char *));
447extern void file_impossible PARAMS ((char *));
448extern char *dir_name PARAMS ((char *));
449extern void hash_init_directories PARAMS ((void));
450
451extern void define_default_variables PARAMS ((void));
452extern void set_default_suffixes PARAMS ((void));
453extern void install_default_suffix_rules PARAMS ((void));
454extern void install_default_implicit_rules PARAMS ((void));
455
456extern void build_vpath_lists PARAMS ((void));
457extern void construct_vpath_list PARAMS ((char *pattern, char *dirpath));
458extern int vpath_search PARAMS ((char **file, FILE_TIMESTAMP *mtime_ptr));
459extern int gpath_search PARAMS ((char *file, unsigned int len));
460
461extern void construct_include_path PARAMS ((char **arg_dirs));
462
463extern void user_access PARAMS ((void));
464extern void make_access PARAMS ((void));
465extern void child_access PARAMS ((void));
466
467extern void close_stdout PARAMS ((void));
468
469extern char *strip_whitespace PARAMS ((const char **begpp, const char **endpp));
470
471/* String caching */
472extern void strcache_init PARAMS ((void));
473extern void strcache_print_stats PARAMS ((const char *prefix));
474extern int strcache_iscached PARAMS ((const char *str));
475extern const char *strcache_add PARAMS ((const char *str));
476extern const char *strcache_add_len PARAMS ((const char *str, int len));
477extern int strcache_setbufsize PARAMS ((int size));
478
479#ifdef HAVE_VFORK_H
480# include <vfork.h>
481#endif
482
483/* We omit these declarations on non-POSIX systems which define _POSIX_VERSION,
484 because such systems often declare them in header files anyway. */
485
486#if !defined (__GNU_LIBRARY__) && !defined (POSIX) && !defined (_POSIX_VERSION) && !defined(WINDOWS32)
487
488extern long int atol ();
489# ifndef VMS
490extern long int lseek ();
491# endif
492
493#endif /* Not GNU C library or POSIX. */
494
495#ifdef HAVE_GETCWD
496# if !defined(VMS) && !defined(__DECC)
497extern char *getcwd ();
498# endif
499#else
500extern char *getwd ();
501# define getcwd(buf, len) getwd (buf)
502#endif
503
504extern const struct floc *reading_file;
505extern const struct floc **expanding_var;
506
507extern char **environ;
508
509extern int just_print_flag, silent_flag, ignore_errors_flag, keep_going_flag;
510extern int print_data_base_flag, question_flag, touch_flag, always_make_flag;
511extern int env_overrides, no_builtin_rules_flag, no_builtin_variables_flag;
512extern int print_version_flag, print_directory_flag, check_symlink_flag;
513extern int warn_undefined_variables_flag, posix_pedantic, not_parallel;
514extern int second_expansion, clock_skew_detected, rebuilding_makefiles;
515#ifdef CONFIG_PRETTY_COMMAND_PRINTING
516extern int pretty_command_printing;
517#endif
518
519/* can we run commands via 'sh -c xxx' or must we use batch files? */
520extern int batch_mode_shell;
521
522extern unsigned int job_slots;
523extern int job_fds[2];
524extern int job_rfd;
525#ifndef NO_FLOAT
526extern double max_load_average;
527#else
528extern int max_load_average;
529#endif
530
531extern char *program;
532extern char *starting_directory;
533extern unsigned int makelevel;
534extern char *version_string, *remote_description, *make_host;
535
536extern unsigned int commands_started;
537
538extern int handling_fatal_signal;
539
540
541#ifndef MIN
542#define MIN(_a,_b) ((_a)<(_b)?(_a):(_b))
543#endif
544#ifndef MAX
545#define MAX(_a,_b) ((_a)>(_b)?(_a):(_b))
546#endif
547
548#ifdef VMS
549# define MAKE_SUCCESS 1
550# define MAKE_TROUBLE 2
551# define MAKE_FAILURE 3
552#else
553# define MAKE_SUCCESS 0
554# define MAKE_TROUBLE 1
555# define MAKE_FAILURE 2
556#endif
557
558/* Set up heap debugging library dmalloc. */
559
560#ifdef HAVE_DMALLOC_H
561#include <dmalloc.h>
562#endif
563
564#ifndef initialize_main
565# ifdef __EMX__
566# define initialize_main(pargc, pargv) \
567 { _wildcard(pargc, pargv); _response(pargc, pargv); }
568# else
569# define initialize_main(pargc, pargv)
570# endif
571#endif
572
573
574#ifdef __EMX__
575# if !HAVE_STRCASECMP
576# define strcasecmp stricmp
577# endif
578
579# if !defined chdir
580# define chdir _chdir2
581# endif
582# if !defined getcwd
583# define getcwd _getcwd2
584# endif
585
586/* NO_CHDIR2 causes make not to use _chdir2() and _getcwd2() instead of
587 chdir() and getcwd(). This avoids some error messages for the
588 make testsuite but restricts the drive letter support. */
589# ifdef NO_CHDIR2
590# warning NO_CHDIR2: usage of drive letters restricted
591# undef chdir
592# undef getcwd
593# endif
594#endif
595
596#ifndef initialize_main
597# define initialize_main(pargc, pargv)
598#endif
599
600
601/* Some systems (like Solaris, PTX, etc.) do not support the SA_RESTART flag
602 properly according to POSIX. So, we try to wrap common system calls with
603 checks for EINTR. Note that there are still plenty of system calls that
604 can fail with EINTR but this, reportedly, gets the vast majority of
605 failure cases. If you still experience failures you'll need to either get
606 a system where SA_RESTART works, or you need to avoid -j. */
607
608#define EINTRLOOP(_v,_c) while (((_v)=_c)==-1 && errno==EINTR)
609
610/* While system calls that return integers are pretty consistent about
611 returning -1 on failure and setting errno in that case, functions that
612 return pointers are not always so well behaved. Sometimes they return
613 NULL for expected behavior: one good example is readdir() which returns
614 NULL at the end of the directory--and _doesn't_ reset errno. So, we have
615 to do it ourselves here. */
616
617#define ENULLLOOP(_v,_c) do{ errno = 0; \
618 while (((_v)=_c)==0 && errno==EINTR); }while(0)
619
620#if defined(__EMX__) && defined(CONFIG_WITH_OPTIMIZATION_HACKS) /* bird: saves 40-100ms on libc. */
621static inline void *__my_rawmemchr (const void *__s, int __c);
622#undef strchr
623#define strchr(s, c) \
624 (__extension__ (__builtin_constant_p (c) \
625 ? ((c) == '\0' \
626 ? (char *) __my_rawmemchr ((s), (c)) \
627 : __my_strchr_c ((s), ((c) & 0xff) << 8)) \
628 : __my_strchr_g ((s), (c))))
629static inline char *__my_strchr_c (const char *__s, int __c)
630{
631 register unsigned long int __d0;
632 register char *__res;
633 __asm__ __volatile__
634 ("1:\n\t"
635 "movb (%0),%%al\n\t"
636 "cmpb %%ah,%%al\n\t"
637 "je 2f\n\t"
638 "leal 1(%0),%0\n\t"
639 "testb %%al,%%al\n\t"
640 "jne 1b\n\t"
641 "xorl %0,%0\n"
642 "2:"
643 : "=r" (__res), "=&a" (__d0)
644 : "0" (__s), "1" (__c),
645 "m" ( *(struct { char __x[0xfffffff]; } *)__s)
646 : "cc");
647 return __res;
648}
649
650static inline char *__my_strchr_g (__const char *__s, int __c)
651{
652 register unsigned long int __d0;
653 register char *__res;
654 __asm__ __volatile__
655 ("movb %%al,%%ah\n"
656 "1:\n\t"
657 "movb (%0),%%al\n\t"
658 "cmpb %%ah,%%al\n\t"
659 "je 2f\n\t"
660 "leal 1(%0),%0\n\t"
661 "testb %%al,%%al\n\t"
662 "jne 1b\n\t"
663 "xorl %0,%0\n"
664 "2:"
665 : "=r" (__res), "=&a" (__d0)
666 : "0" (__s), "1" (__c),
667 "m" ( *(struct { char __x[0xfffffff]; } *)__s)
668 : "cc");
669 return __res;
670}
671
672static inline void *__my_rawmemchr (const void *__s, int __c)
673{
674 register unsigned long int __d0;
675 register unsigned char *__res;
676 __asm__ __volatile__
677 ("cld\n\t"
678 "repne; scasb\n\t"
679 : "=D" (__res), "=&c" (__d0)
680 : "a" (__c), "0" (__s), "1" (0xffffffff),
681 "m" ( *(struct { char __x[0xfffffff]; } *)__s)
682 : "cc");
683 return __res - 1;
684}
685
686#undef memchr
687#define memchr(a,b,c) __my_memchr((a),(b),(c))
688static inline void *__my_memchr (__const void *__s, int __c, size_t __n)
689{
690 register unsigned long int __d0;
691 register unsigned char *__res;
692 if (__n == 0)
693 return NULL;
694 __asm__ __volatile__
695 ("repne; scasb\n\t"
696 "je 1f\n\t"
697 "movl $1,%0\n"
698 "1:"
699 : "=D" (__res), "=&c" (__d0)
700 : "a" (__c), "0" (__s), "1" (__n),
701 "m" ( *(struct { __extension__ char __x[__n]; } *)__s)
702 : "cc");
703 return __res - 1;
704}
705
706#endif /* __EMX__ (bird) */
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