[binutils.git] / include / libiberty.h

/* Function declarations for libiberty.

   Copyright 2001, 2002 Free Software Foundation, Inc.
   
   Note - certain prototypes declared in this header file are for
   functions whoes implementation copyright does not belong to the
   FSF.  Those prototypes are present in this file for reference
   purposes only and their presence in this file should not construed
   as an indication of ownership by the FSF of the implementation of
   those functions in any way or form whatsoever.

   This program 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 2, or (at your option)
   any later version.

   This program 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, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.
   
   Written by Cygnus Support, 1994.

   The libiberty library provides a number of functions which are
   missing on some operating systems.  We do not declare those here,
   to avoid conflicts with the system header files on operating
   systems that do support those functions.  In this file we only
   declare those functions which are specific to libiberty.  */

#ifndef LIBIBERTY_H
#define LIBIBERTY_H

#ifdef __cplusplus
extern "C" {
#endif

#include "ansidecl.h"

#ifdef ANSI_PROTOTYPES
/* Get a definition for size_t.  */
#include <stddef.h>
/* Get a definition for va_list.  */
#include <stdarg.h>
#endif

/* Build an argument vector from a string.  Allocates memory using
   malloc.  Use freeargv to free the vector.  */

extern char **buildargv PARAMS ((const char *)) ATTRIBUTE_MALLOC;

/* Free a vector returned by buildargv.  */

extern void freeargv PARAMS ((char **));

/* Duplicate an argument vector. Allocates memory using malloc.  Use
   freeargv to free the vector.  */

extern char **dupargv PARAMS ((char **)) ATTRIBUTE_MALLOC;


/* Return the last component of a path name.  Note that we can't use a
   prototype here because the parameter is declared inconsistently
   across different systems, sometimes as "char *" and sometimes as
   "const char *" */

/* HAVE_DECL_* is a three-state macro: undefined, 0 or 1.  If it is
   undefined, we haven't run the autoconf check so provide the
   declaration without arguments.  If it is 0, we checked and failed
   to find the declaration so provide a fully prototyped one.  If it
   is 1, we found it so don't provide any declaration at all.  */
#if !HAVE_DECL_BASENAME
#if defined (__GNU_LIBRARY__ ) || defined (__linux__) || defined (__FreeBSD__) || defined (__OpenBSD__) || defined(__NetBSD__) || defined (__CYGWIN__) || defined (__CYGWIN32__) || defined (HAVE_DECL_BASENAME)
extern char *basename PARAMS ((const char *));
#else
extern char *basename ();
#endif
#endif

/* A well-defined basename () that is always compiled in.  */

extern const char *lbasename PARAMS ((const char *));

/* Concatenate an arbitrary number of strings.  You must pass NULL as
   the last argument of this function, to terminate the list of
   strings.  Allocates memory using xmalloc.  */

extern char *concat PARAMS ((const char *, ...)) ATTRIBUTE_MALLOC;

/* Concatenate an arbitrary number of strings.  You must pass NULL as
   the last argument of this function, to terminate the list of
   strings.  Allocates memory using xmalloc.  The first argument is
   not one of the strings to be concatenated, but if not NULL is a
   pointer to be freed after the new string is created, similar to the
   way xrealloc works.  */

extern char *reconcat PARAMS ((char *, const char *, ...)) ATTRIBUTE_MALLOC;

/* Determine the length of concatenating an arbitrary number of
   strings.  You must pass NULL as the last argument of this function,
   to terminate the list of strings.  */

extern unsigned long concat_length PARAMS ((const char *, ...));

/* Concatenate an arbitrary number of strings into a SUPPLIED area of
   memory.  You must pass NULL as the last argument of this function,
   to terminate the list of strings.  The supplied memory is assumed
   to be large enough.  */

extern char *concat_copy PARAMS ((char *, const char *, ...));

/* Concatenate an arbitrary number of strings into a GLOBAL area of
   memory.  You must pass NULL as the last argument of this function,
   to terminate the list of strings.  The supplied memory is assumed
   to be large enough.  */

extern char *concat_copy2 PARAMS ((const char *, ...));

/* This is the global area used by concat_copy2.  */

extern char *libiberty_concat_ptr;

/* Concatenate an arbitrary number of strings.  You must pass NULL as
   the last argument of this function, to terminate the list of
   strings.  Allocates memory using alloca.  The arguments are
   evaluated twice!  */
#define ACONCAT(ACONCAT_PARAMS) \
  (libiberty_concat_ptr = alloca (concat_length ACONCAT_PARAMS + 1), \
   concat_copy2 ACONCAT_PARAMS)

/* Check whether two file descriptors refer to the same file.  */

extern int fdmatch PARAMS ((int fd1, int fd2));

/* Get the working directory.  The result is cached, so don't call
   chdir() between calls to getpwd().  */

extern char * getpwd PARAMS ((void));

/* Get the amount of time the process has run, in microseconds.  */

extern long get_run_time PARAMS ((void));

/* Generate a relocated path to some installation directory.  Allocates
   return value using malloc.  */

extern char *make_relative_prefix PARAMS ((const char *, const char *,
					   const char *));

/* Choose a temporary directory to use for scratch files.  */

extern char *choose_temp_base PARAMS ((void)) ATTRIBUTE_MALLOC;

/* Return a temporary file name or NULL if unable to create one.  */

extern char *make_temp_file PARAMS ((const char *)) ATTRIBUTE_MALLOC;

/* Allocate memory filled with spaces.  Allocates using malloc.  */

extern const char *spaces PARAMS ((int count));

/* Return the maximum error number for which strerror will return a
   string.  */

extern int errno_max PARAMS ((void));

/* Return the name of an errno value (e.g., strerrno (EINVAL) returns
   "EINVAL").  */

extern const char *strerrno PARAMS ((int));

/* Given the name of an errno value, return the value.  */

extern int strtoerrno PARAMS ((const char *));

/* ANSI's strerror(), but more robust.  */

extern char *xstrerror PARAMS ((int));

/* Return the maximum signal number for which strsignal will return a
   string.  */

extern int signo_max PARAMS ((void));

/* Return a signal message string for a signal number
   (e.g., strsignal (SIGHUP) returns something like "Hangup").  */
/* This is commented out as it can conflict with one in system headers.
   We still document its existence though.  */

/*extern const char *strsignal PARAMS ((int));*/

/* Return the name of a signal number (e.g., strsigno (SIGHUP) returns
   "SIGHUP").  */

extern const char *strsigno PARAMS ((int));

/* Given the name of a signal, return its number.  */

extern int strtosigno PARAMS ((const char *));

/* Register a function to be run by xexit.  Returns 0 on success.  */

extern int xatexit PARAMS ((void (*fn) (void)));

/* Exit, calling all the functions registered with xatexit.  */

extern void xexit PARAMS ((int status)) ATTRIBUTE_NORETURN;

/* Set the program name used by xmalloc.  */

extern void xmalloc_set_program_name PARAMS ((const char *));

/* Report an allocation failure.  */
extern void xmalloc_failed PARAMS ((size_t)) ATTRIBUTE_NORETURN;

/* Allocate memory without fail.  If malloc fails, this will print a
   message to stderr (using the name set by xmalloc_set_program_name,
   if any) and then call xexit.  */

extern PTR xmalloc PARAMS ((size_t)) ATTRIBUTE_MALLOC;

/* Reallocate memory without fail.  This works like xmalloc.  Note,
   realloc type functions are not suitable for attribute malloc since
   they may return the same address across multiple calls. */

extern PTR xrealloc PARAMS ((PTR, size_t));

/* Allocate memory without fail and set it to zero.  This works like
   xmalloc.  */

extern PTR xcalloc PARAMS ((size_t, size_t)) ATTRIBUTE_MALLOC;

/* Copy a string into a memory buffer without fail.  */

extern char *xstrdup PARAMS ((const char *)) ATTRIBUTE_MALLOC;

/* Copy an existing memory buffer to a new memory buffer without fail.  */

extern PTR xmemdup PARAMS ((const PTR, size_t, size_t)) ATTRIBUTE_MALLOC;

/* hex character manipulation routines */

#define _hex_array_size 256
#define _hex_bad	99
extern const char _hex_value[_hex_array_size];
extern void hex_init PARAMS ((void));
#define hex_p(c)	(hex_value (c) != _hex_bad)
/* If you change this, note well: Some code relies on side effects in
   the argument being performed exactly once.  */
#define hex_value(c)	(_hex_value[(unsigned char) (c)])

/* Definitions used by the pexecute routine.  */

#define PEXECUTE_FIRST   1
#define PEXECUTE_LAST    2
#define PEXECUTE_ONE     (PEXECUTE_FIRST + PEXECUTE_LAST)
#define PEXECUTE_SEARCH  4
#define PEXECUTE_VERBOSE 8

/* Execute a program.  */

extern int pexecute PARAMS ((const char *, char * const *, const char *,
			    const char *, char **, char **, int));

/* Wait for pexecute to finish.  */

extern int pwait PARAMS ((int, int *, int));

#if !HAVE_DECL_ASPRINTF
/* Like sprintf but provides a pointer to malloc'd storage, which must
   be freed by the caller.  */

extern int asprintf PARAMS ((char **, const char *, ...)) ATTRIBUTE_PRINTF_2;
#endif

#if !HAVE_DECL_VASPRINTF
/* Like vsprintf but provides a pointer to malloc'd storage, which
   must be freed by the caller.  */

extern int vasprintf PARAMS ((char **, const char *, va_list))
  ATTRIBUTE_PRINTF(2,0);
#endif

#define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))

/* Drastically simplified alloca configurator.  If we're using GCC,
   we use __builtin_alloca; otherwise we use the C alloca.  The C
   alloca is always available.  You can override GCC by defining
   USE_C_ALLOCA yourself.  The canonical autoconf macro C_ALLOCA is
   also set/unset as it is often used to indicate whether code needs
   to call alloca(0).  */
extern PTR C_alloca PARAMS ((size_t)) ATTRIBUTE_MALLOC;
#undef alloca
#if GCC_VERSION >= 2000 && !defined USE_C_ALLOCA
# define alloca(x) __builtin_alloca(x)
# undef C_ALLOCA
# define ASTRDUP(X) \
  (__extension__ ({ const char *const libiberty_optr = (X); \
   const unsigned long libiberty_len = strlen (libiberty_optr) + 1; \
   char *const libiberty_nptr = alloca (libiberty_len); \
   (char *) memcpy (libiberty_nptr, libiberty_optr, libiberty_len); }))
#else
# define alloca(x) C_alloca(x)
# undef USE_C_ALLOCA
# define USE_C_ALLOCA 1
# undef C_ALLOCA
# define C_ALLOCA 1
extern const char *libiberty_optr;
extern char *libiberty_nptr;
extern unsigned long libiberty_len;
# define ASTRDUP(X) \
  (libiberty_optr = (X), \
   libiberty_len = strlen (libiberty_optr) + 1, \
   libiberty_nptr = alloca (libiberty_len), \
   (char *) memcpy (libiberty_nptr, libiberty_optr, libiberty_len))
#endif

#ifdef __cplusplus
}
#endif


#endif /* ! defined (LIBIBERTY_H) */
Commit	Line	Data
252b5132	1	/* Function declarations for libiberty.
4f1d9bd8	2
1d619e59	3	Copyright 2001, 2002 Free Software Foundation, Inc.
4f1d9bd8	4
526c3e12 NC	5	Note - certain prototypes declared in this header file are for
	6	functions whoes implementation copyright does not belong to the
	7	FSF. Those prototypes are present in this file for reference
	8	purposes only and their presence in this file should not construed
	9	as an indication of ownership by the FSF of the implementation of
	10	those functions in any way or form whatsoever.
	11
4f1d9bd8 NC	12	This program is free software; you can redistribute it and/or modify
	13	it under the terms of the GNU General Public License as published by
	14	the Free Software Foundation; either version 2, or (at your option)
	15	any later version.
	16
	17	This program is distributed in the hope that it will be useful,
	18	but WITHOUT ANY WARRANTY; without even the implied warranty of
	19	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	20	GNU General Public License for more details.
	21
	22	You should have received a copy of the GNU General Public License
	23	along with this program; if not, write to the Free Software
	24	Foundation, Inc., 59 Temple Place - Suite 330,
	25	Boston, MA 02111-1307, USA.
	26
252b5132 RH	27	Written by Cygnus Support, 1994.
	28
	29	The libiberty library provides a number of functions which are
	30	missing on some operating systems. We do not declare those here,
	31	to avoid conflicts with the system header files on operating
	32	systems that do support those functions. In this file we only
	33	declare those functions which are specific to libiberty. */
	34
	35	#ifndef LIBIBERTY_H
	36	#define LIBIBERTY_H
	37
	38	#ifdef __cplusplus
	39	extern "C" {
	40	#endif
	41
	42	#include "ansidecl.h"
	43
b13291a9 DD	44	#ifdef ANSI_PROTOTYPES
	45	/* Get a definition for size_t. */
	46	#include <stddef.h>
	47	/* Get a definition for va_list. */
	48	#include <stdarg.h>
	49	#endif
	50
252b5132 RH	51	/* Build an argument vector from a string. Allocates memory using
	52	malloc. Use freeargv to free the vector. */
	53
e6450fe5	54	extern char *buildargv PARAMS ((const char )) ATTRIBUTE_MALLOC;
252b5132 RH	55
	56	/* Free a vector returned by buildargv. */
	57
	58	extern void freeargv PARAMS ((char **));
	59
	60	/* Duplicate an argument vector. Allocates memory using malloc. Use
	61	freeargv to free the vector. */
	62
cc89ffe6	63	extern char dupargv PARAMS ((char )) ATTRIBUTE_MALLOC;
252b5132 RH	64
	65
	66	/* Return the last component of a path name. Note that we can't use a
	67	prototype here because the parameter is declared inconsistently
	68	across different systems, sometimes as "char *" and sometimes as
	69	"const char " /
	70
79c6de76 L	71	/* HAVE_DECL_* is a three-state macro: undefined, 0 or 1. If it is
	72	undefined, we haven't run the autoconf check so provide the
	73	declaration without arguments. If it is 0, we checked and failed
	74	to find the declaration so provide a fully prototyped one. If it
	75	is 1, we found it so don't provide any declaration at all. */
931f285f	76	#if !HAVE_DECL_BASENAME
40fb7a1f	77	#if defined (__GNU_LIBRARY__ ) \|\| defined (__linux__) \|\| defined (__FreeBSD__) \|\| defined (__OpenBSD__) \|\| defined(__NetBSD__) \|\| defined (__CYGWIN__) \|\| defined (__CYGWIN32__) \|\| defined (HAVE_DECL_BASENAME)
252b5132 RH	78	extern char basename PARAMS ((const char ));
	79	#else
	80	extern char *basename ();
931f285f	81	#endif
252b5132 RH	82	#endif
252b5132 RH	83
8aa30e60 DD	84	/* A well-defined basename () that is always compiled in. */
8aa30e60 DD	85
3ea71002	86	extern const char lbasename PARAMS ((const char ));
8aa30e60	87
38bfaea8 DD	88	/* Concatenate an arbitrary number of strings. You must pass NULL as
	89	the last argument of this function, to terminate the list of
	90	strings. Allocates memory using xmalloc. */
252b5132	91
cc89ffe6	92	extern char concat PARAMS ((const char , ...)) ATTRIBUTE_MALLOC;
252b5132	93
99ee3a8f DD	94	/* Concatenate an arbitrary number of strings. You must pass NULL as
	95	the last argument of this function, to terminate the list of
	96	strings. Allocates memory using xmalloc. The first argument is
	97	not one of the strings to be concatenated, but if not NULL is a
	98	pointer to be freed after the new string is created, similar to the
	99	way xrealloc works. */
	100
	101	extern char reconcat PARAMS ((char , const char *, ...)) ATTRIBUTE_MALLOC;
	102
54c20242	103	/* Determine the length of concatenating an arbitrary number of
38bfaea8 DD	104	strings. You must pass NULL as the last argument of this function,
38bfaea8 DD	105	to terminate the list of strings. */
54c20242 DD	106
	107	extern unsigned long concat_length PARAMS ((const char *, ...));
	108
	109	/* Concatenate an arbitrary number of strings into a SUPPLIED area of
38bfaea8 DD	110	memory. You must pass NULL as the last argument of this function,
	111	to terminate the list of strings. The supplied memory is assumed
	112	to be large enough. */
54c20242 DD	113
	114	extern char concat_copy PARAMS ((char , const char *, ...));
	115
	116	/* Concatenate an arbitrary number of strings into a GLOBAL area of
38bfaea8 DD	117	memory. You must pass NULL as the last argument of this function,
	118	to terminate the list of strings. The supplied memory is assumed
	119	to be large enough. */
54c20242 DD	120
	121	extern char concat_copy2 PARAMS ((const char , ...));
	122
	123	/* This is the global area used by concat_copy2. */
	124
	125	extern char *libiberty_concat_ptr;
	126
38bfaea8 DD	127	/* Concatenate an arbitrary number of strings. You must pass NULL as
	128	the last argument of this function, to terminate the list of
	129	strings. Allocates memory using alloca. The arguments are
	130	evaluated twice! */
54c20242 DD	131	#define ACONCAT(ACONCAT_PARAMS) \
	132	(libiberty_concat_ptr = alloca (concat_length ACONCAT_PARAMS + 1), \
	133	concat_copy2 ACONCAT_PARAMS)
	134
252b5132 RH	135	/* Check whether two file descriptors refer to the same file. */
	136
	137	extern int fdmatch PARAMS ((int fd1, int fd2));
	138
cc89ffe6 ILT	139	/* Get the working directory. The result is cached, so don't call
	140	chdir() between calls to getpwd(). */
	141
	142	extern char * getpwd PARAMS ((void));
	143
252b5132 RH	144	/* Get the amount of time the process has run, in microseconds. */
	145
	146	extern long get_run_time PARAMS ((void));
	147
2a80c0a4 DD	148	/* Generate a relocated path to some installation directory. Allocates
	149	return value using malloc. */
	150
	151	extern char make_relative_prefix PARAMS ((const char , const char *,
	152	const char *));
	153
252b5132 RH	154	/* Choose a temporary directory to use for scratch files. */
252b5132 RH	155
cc89ffe6 ILT	156	extern char *choose_temp_base PARAMS ((void)) ATTRIBUTE_MALLOC;
	157
	158	/* Return a temporary file name or NULL if unable to create one. */
	159
	160	extern char make_temp_file PARAMS ((const char )) ATTRIBUTE_MALLOC;
252b5132 RH	161
	162	/* Allocate memory filled with spaces. Allocates using malloc. */
	163
	164	extern const char *spaces PARAMS ((int count));
	165
	166	/* Return the maximum error number for which strerror will return a
	167	string. */
	168
	169	extern int errno_max PARAMS ((void));
	170
	171	/* Return the name of an errno value (e.g., strerrno (EINVAL) returns
	172	"EINVAL"). */
	173
	174	extern const char *strerrno PARAMS ((int));
	175
	176	/* Given the name of an errno value, return the value. */
	177
	178	extern int strtoerrno PARAMS ((const char *));
	179
	180	/* ANSI's strerror(), but more robust. */
	181
	182	extern char *xstrerror PARAMS ((int));
	183
	184	/* Return the maximum signal number for which strsignal will return a
	185	string. */
	186
	187	extern int signo_max PARAMS ((void));
	188
	189	/* Return a signal message string for a signal number
	190	(e.g., strsignal (SIGHUP) returns something like "Hangup"). */
	191	/* This is commented out as it can conflict with one in system headers.
	192	We still document its existence though. */
	193
	194	/extern const char strsignal PARAMS ((int));*/
	195
	196	/* Return the name of a signal number (e.g., strsigno (SIGHUP) returns
	197	"SIGHUP"). */
	198
	199	extern const char *strsigno PARAMS ((int));
	200
	201	/* Given the name of a signal, return its number. */
	202
	203	extern int strtosigno PARAMS ((const char *));
	204
	205	/* Register a function to be run by xexit. Returns 0 on success. */
	206
	207	extern int xatexit PARAMS ((void (*fn) (void)));
	208
	209	/* Exit, calling all the functions registered with xatexit. */
	210
cc89ffe6	211	extern void xexit PARAMS ((int status)) ATTRIBUTE_NORETURN;
252b5132 RH	212
	213	/* Set the program name used by xmalloc. */
	214
	215	extern void xmalloc_set_program_name PARAMS ((const char *));
	216
b13291a9 DD	217	/* Report an allocation failure. */
	218	extern void xmalloc_failed PARAMS ((size_t)) ATTRIBUTE_NORETURN;
	219
252b5132 RH	220	/* Allocate memory without fail. If malloc fails, this will print a
	221	message to stderr (using the name set by xmalloc_set_program_name,
	222	if any) and then call xexit. */
	223
cc89ffe6	224	extern PTR xmalloc PARAMS ((size_t)) ATTRIBUTE_MALLOC;
252b5132	225
cc89ffe6 ILT	226	/* Reallocate memory without fail. This works like xmalloc. Note,
	227	realloc type functions are not suitable for attribute malloc since
	228	they may return the same address across multiple calls. */
252b5132 RH	229
	230	extern PTR xrealloc PARAMS ((PTR, size_t));
	231
	232	/* Allocate memory without fail and set it to zero. This works like
	233	xmalloc. */
	234
cc89ffe6	235	extern PTR xcalloc PARAMS ((size_t, size_t)) ATTRIBUTE_MALLOC;
252b5132 RH	236
	237	/* Copy a string into a memory buffer without fail. */
	238
cc89ffe6 ILT	239	extern char xstrdup PARAMS ((const char )) ATTRIBUTE_MALLOC;
	240
	241	/* Copy an existing memory buffer to a new memory buffer without fail. */
	242
	243	extern PTR xmemdup PARAMS ((const PTR, size_t, size_t)) ATTRIBUTE_MALLOC;
252b5132 RH	244
	245	/* hex character manipulation routines */
	246
	247	#define _hex_array_size 256
	248	#define _hex_bad 99
d311a83a	249	extern const char _hex_value[_hex_array_size];
252b5132 RH	250	extern void hex_init PARAMS ((void));
	251	#define hex_p(c) (hex_value (c) != _hex_bad)
	252	/* If you change this, note well: Some code relies on side effects in
	253	the argument being performed exactly once. */
	254	#define hex_value(c) (_hex_value[(unsigned char) (c)])
	255
	256	/* Definitions used by the pexecute routine. */
	257
	258	#define PEXECUTE_FIRST 1
	259	#define PEXECUTE_LAST 2
	260	#define PEXECUTE_ONE (PEXECUTE_FIRST + PEXECUTE_LAST)
	261	#define PEXECUTE_SEARCH 4
	262	#define PEXECUTE_VERBOSE 8
	263
	264	/* Execute a program. */
	265
	266	extern int pexecute PARAMS ((const char , char const , const char ,
	267	const char , char , char *, int));
	268
	269	/* Wait for pexecute to finish. */
	270
	271	extern int pwait PARAMS ((int, int *, int));
	272
bb7eb039	273	#if !HAVE_DECL_ASPRINTF
cc89ffe6 ILT	274	/* Like sprintf but provides a pointer to malloc'd storage, which must
	275	be freed by the caller. */
	276
	277	extern int asprintf PARAMS ((char *, const char , ...)) ATTRIBUTE_PRINTF_2;
bb7eb039	278	#endif
cc89ffe6	279
bb7eb039	280	#if !HAVE_DECL_VASPRINTF
cc89ffe6 ILT	281	/* Like vsprintf but provides a pointer to malloc'd storage, which
	282	must be freed by the caller. */
	283
	284	extern int vasprintf PARAMS ((char *, const char , va_list))
	285	ATTRIBUTE_PRINTF(2,0);
bb7eb039	286	#endif
cc89ffe6	287
b18903cb NC	288	#define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
b18903cb NC	289
30673bf5 DD	290	/* Drastically simplified alloca configurator. If we're using GCC,
	291	we use __builtin_alloca; otherwise we use the C alloca. The C
	292	alloca is always available. You can override GCC by defining
129e8d96 DD	293	USE_C_ALLOCA yourself. The canonical autoconf macro C_ALLOCA is
	294	also set/unset as it is often used to indicate whether code needs
	295	to call alloca(0). */
1d619e59	296	extern PTR C_alloca PARAMS ((size_t)) ATTRIBUTE_MALLOC;
30673bf5 DD	297	#undef alloca
	298	#if GCC_VERSION >= 2000 && !defined USE_C_ALLOCA
	299	# define alloca(x) __builtin_alloca(x)
129e8d96	300	# undef C_ALLOCA
54c20242 DD	301	# define ASTRDUP(X) \
	302	(__extension__ ({ const char *const libiberty_optr = (X); \
	303	const unsigned long libiberty_len = strlen (libiberty_optr) + 1; \
	304	char *const libiberty_nptr = alloca (libiberty_len); \
	305	(char *) memcpy (libiberty_nptr, libiberty_optr, libiberty_len); }))
30673bf5 DD	306	#else
	307	# define alloca(x) C_alloca(x)
	308	# undef USE_C_ALLOCA
	309	# define USE_C_ALLOCA 1
129e8d96 DD	310	# undef C_ALLOCA
129e8d96 DD	311	# define C_ALLOCA 1
54c20242 DD	312	extern const char *libiberty_optr;
	313	extern char *libiberty_nptr;
	314	extern unsigned long libiberty_len;
	315	# define ASTRDUP(X) \
	316	(libiberty_optr = (X), \
	317	libiberty_len = strlen (libiberty_optr) + 1, \
	318	libiberty_nptr = alloca (libiberty_len), \
	319	(char *) memcpy (libiberty_nptr, libiberty_optr, libiberty_len))
30673bf5 DD	320	#endif
30673bf5 DD	321
252b5132 RH	322	#ifdef __cplusplus
	323	}
	324	#endif
	325
	326
	327	#endif /* ! defined (LIBIBERTY_H) */