/* stdlib.h: ANSI draft (X3J11 May 88) library header, section 4.10 */
/* Copyright (C) Codemist Ltd., 1988-1993. */
/* Copyright 1991-1998,2014 ARM Limited. All rights reserved. */
/*
* RCS $Revision$
* Checkin $Date$
* Revising $Author: agrant $
*/
/*
* stdlib.h declares four types, several general purpose functions,
* and defines several macros.
*/
#ifndef __stdlib_h
#define __stdlib_h
#define __ARMCLIB_VERSION 5060034
#if defined(__clang__) || (defined(__ARMCC_VERSION) && !defined(__STRICT_ANSI__))
/* armclang and non-strict armcc allow 'long long' in system headers */
#define __LONGLONG long long
#else
/* strict armcc has '__int64' */
#define __LONGLONG __int64
#endif
#define _ARMABI __declspec(__nothrow)
#define _ARMABI_PURE __declspec(__nothrow) __attribute__((const))
#define _ARMABI_NORETURN __declspec(__nothrow) __declspec(__noreturn)
#define _ARMABI_THROW
#ifndef __STDLIB_DECLS
#define __STDLIB_DECLS
/*
* Some of these declarations are new in C99. To access them in C++
* you can use -D__USE_C99_STDLIB (or -D__USE_C99ALL).
*/
#ifndef __USE_C99_STDLIB
#if defined(__USE_C99_ALL) || (defined(__STDC_VERSION__) && 199901L <= __STDC_VERSION__) || (defined(__cplusplus) && 201103L <= __cplusplus)
#define __USE_C99_STDLIB 1
#endif
#endif
#undef __CLIBNS
#ifdef __cplusplus
namespace std {
#define __CLIBNS ::std::
extern "C" {
#else
#define __CLIBNS
#endif /* __cplusplus */
#if defined(__cplusplus) || !defined(__STRICT_ANSI__)
/* unconditional in C++ and non-strict C for consistency of debug info */
#if __sizeof_ptr == 8
typedef unsigned long size_t; /* see <stddef.h> */
#else
typedef unsigned int size_t; /* see <stddef.h> */
#endif
#elif !defined(__size_t)
#define __size_t 1
#if __sizeof_ptr == 8
typedef unsigned long size_t; /* see <stddef.h> */
#else
typedef unsigned int size_t; /* see <stddef.h> */
#endif
#endif
#undef NULL
#define NULL 0 /* see <stddef.h> */
#ifndef __cplusplus /* wchar_t is a builtin type for C++ */
#if !defined(__STRICT_ANSI__)
/* unconditional in non-strict C for consistency of debug info */
#if defined(__WCHAR32) || (defined(__ARM_SIZEOF_WCHAR_T) && __ARM_SIZEOF_WCHAR_T == 4)
typedef unsigned int wchar_t; /* see <stddef.h> */
#else
typedef unsigned short wchar_t; /* see <stddef.h> */
#endif
#elif !defined(__wchar_t)
#define __wchar_t 1
#if defined(__WCHAR32) || (defined(__ARM_SIZEOF_WCHAR_T) && __ARM_SIZEOF_WCHAR_T == 4)
typedef unsigned int wchar_t; /* see <stddef.h> */
#else
typedef unsigned short wchar_t; /* see <stddef.h> */
#endif
#endif
#endif
typedef struct div_t { int quot, rem; } div_t;
/* type of the value returned by the div function. */
typedef struct ldiv_t { long int quot, rem; } ldiv_t;
/* type of the value returned by the ldiv function. */
#if !defined(__STRICT_ANSI__) || __USE_C99_STDLIB
typedef struct lldiv_t { __LONGLONG quot, rem; } lldiv_t;
/* type of the value returned by the lldiv function. */
#endif
#ifdef __EXIT_FAILURE
# define EXIT_FAILURE __EXIT_FAILURE
/*
* an integral expression which may be used as an argument to the exit
* function to return unsuccessful termination status to the host
* environment.
*/
#else
# define EXIT_FAILURE 1 /* unixoid */
#endif
#define EXIT_SUCCESS 0
/*
* an integral expression which may be used as an argument to the exit
* function to return successful termination status to the host
* environment.
*/
/*
* Defining __USE_ANSI_EXAMPLE_RAND at compile time switches to
* the example implementation of rand() and srand() provided in
* the ANSI C standard. This implementation is very poor, but is
* provided for completeness.
*/
#ifdef __USE_ANSI_EXAMPLE_RAND
#define srand _ANSI_srand
#define rand _ANSI_rand
#define RAND_MAX 0x7fff
#else
#define RAND_MAX 0x7fffffff
#endif
/*
* RAND_MAX: an integral constant expression, the value of which
* is the maximum value returned by the rand function.
*/
extern _ARMABI int __aeabi_MB_CUR_MAX(void);
#define MB_CUR_MAX ( __aeabi_MB_CUR_MAX() )
/*
* a positive integer expression whose value is the maximum number of bytes
* in a multibyte character for the extended character set specified by the
* current locale (category LC_CTYPE), and whose value is never greater
* than MB_LEN_MAX.
*/
/*
* If the compiler supports signalling nans as per N965 then it
* will define __SUPPORT_SNAN__, in which case a user may define
* _WANT_SNAN in order to obtain a compliant version of the strtod
* family of functions.
*/
#if defined(__SUPPORT_SNAN__) && defined(_WANT_SNAN)
#pragma import(__use_snan)
#endif
extern _ARMABI double atof(const char * /*nptr*/) __attribute__((__nonnull__(1)));
/*
* converts the initial part of the string pointed to by nptr to double
* representation.
* Returns: the converted value.
*/
extern _ARMABI int atoi(const char * /*nptr*/) __attribute__((__nonnull__(1)));
/*
* converts the initial part of the string pointed to by nptr to int
* representation.
* Returns: the converted value.
*/
extern _ARMABI long int atol(const char * /*nptr*/) __attribute__((__nonnull__(1)));
/*
* converts the initial part of the string pointed to by nptr to long int
* representation.
* Returns: the converted value.
*/
#if !defined(__STRICT_ANSI__) || __USE_C99_STDLIB
extern _ARMABI __LONGLONG atoll(const char * /*nptr*/) __attribute__((__nonnull__(1)));
/*
* converts the initial part of the string pointed to by nptr to
* long long int representation.
* Returns: the converted value.
*/
#endif
extern _ARMABI double strtod(const char * __restrict /*nptr*/, char ** __restrict /*endptr*/) __attribute__((__nonnull__(1)));
/*
* converts the initial part of the string pointed to by nptr to double
* representation. First it decomposes the input string into three parts:
* an initial, possibly empty, sequence of white-space characters (as
* specified by the isspace function), a subject sequence resembling a
* floating point constant; and a final string of one or more unrecognised
* characters, including the terminating null character of the input string.
* Then it attempts to convert the subject sequence to a floating point
* number, and returns the result. A pointer to the final string is stored
* in the object pointed to by endptr, provided that endptr is not a null
* pointer.
* Returns: the converted value if any. If no conversion could be performed,
* zero is returned. If the correct value is outside the range of
* representable values, plus or minus HUGE_VAL is returned
* (according to the sign of the value), and the value of the macro
* ERANGE is stored in errno. If the correct value would cause
* underflow, zero is returned and the value of the macro ERANGE is
* stored in errno.
*/
#if !defined(__STRICT_ANSI__) || __USE_C99_STDLIB
extern _ARMABI float strtof(const char * __restrict /*nptr*/, char ** __restrict /*endptr*/) __attribute__((__nonnull__(1)));
extern _ARMABI long double strtold(const char * __restrict /*nptr*/, char ** __restrict /*endptr*/) __attribute__((__nonnull__(1)));
/*
* same as strtod, but return float and long double respectively.
*/
#endif
extern _ARMABI long int strtol(const char * __restrict /*nptr*/,
char ** __restrict /*endptr*/, int /*base*/) __attribute__((__nonnull__(1)));
/*
* converts the initial part of the string pointed to by nptr to long int
* representation. First it decomposes the input string into three parts:
* an initial, possibly empty, sequence of white-space characters (as
* specified by the isspace function), a subject sequence resembling an
* integer represented in some radix determined by the value of base, and a
* final string of one or more unrecognised characters, including the
* terminating null character of the input string. Then it attempts to
* convert the subject sequence to an integer, and returns the result.
* If the value of base is 0, the expected form of the subject sequence is
* that of an integer constant (described in ANSI Draft, section 3.1.3.2),
* optionally preceded by a '+' or '-' sign, but not including an integer
* suffix. If the value of base is between 2 and 36, the expected form of
* the subject sequence is a sequence of letters and digits representing an
* integer with the radix specified by base, optionally preceded by a plus
* or minus sign, but not including an integer suffix. The letters from a
* (or A) through z (or Z) are ascribed the values 10 to 35; only letters
* whose ascribed values are less than that of the base are permitted. If
* the value of base is 16, the characters 0x or 0X may optionally precede
* the sequence of letters and digits following the sign if present.
* A pointer to the final string is stored in the object
* pointed to by endptr, provided that endptr is not a null pointer.
* Returns: the converted value if any. If no conversion could be performed,
* zero is returned and nptr is stored in *endptr.
* If the correct value is outside the range of
* representable values, LONG_MAX or LONG_MIN is returned
* (according to the sign of the value), and the value of the
* macro ERANGE is stored in errno.
*/
extern _ARMABI unsigned long int strtoul(const char * __restrict /*nptr*/,
char ** __restrict /*endptr*/, int /*base*/) __attribute__((__nonnull__(1)));
/*
* converts the initial part of the string pointed to by nptr to unsigned
* long int representation. First it decomposes the input string into three
* parts: an initial, possibly empty, sequence of white-space characters (as
* determined by the isspace function), a subject sequence resembling an
* unsigned integer represented in some radix determined by the value of
* base, and a final string of one or more unrecognised characters,
* including the terminating null character of the input string. Then it
* attempts to convert the subject sequence to an unsigned integer, and
* returns the result. If the value of base is zero, the expected form of
* the subject sequence is that of an integer constant (described in ANSI
* Draft, section 3.1.3.2), optionally preceded by a '+' or '-' sign, but
* not including an integer suffix. If the value of base is between 2 and
* 36, the expected form of the subject sequence is a sequence of letters
* and digits representing an integer with the radix specified by base,
* optionally preceded by a '+' or '-' sign, but not including an integer
* suffix. The letters from a (or A) through z (or Z) stand for the values
* 10 to 35; only letters whose ascribed values are less than that of the
* base are permitted. If the value of base is 16, the characters 0x or 0X
* may optionally precede the sequence of letters and digits following the
* sign, if present. A pointer to the final string is stored in the object
* pointed to by endptr, provided that endptr is not a null pointer.
* Returns: the converted value if any. If no conversion could be performed,
* zero is returned and nptr is stored in *endptr.
* If the correct value is outside the range of
* representable values, ULONG_MAX is returned, and the value of
* the macro ERANGE is stored in errno.
*/
/* C90 reserves all names beginning with 'str' */
extern _ARMABI __LONGLONG strtoll(const char * __restrict /*nptr*/,
char ** __restrict /*endptr*/, int /*base*/)
__attribute__((__nonnull__(1)));
/*
* as strtol but returns a long long int value. If the correct value is
* outside the range of representable values, LLONG_MAX or LLONG_MIN is
* returned (according to the sign of the value), and the value of the
* macro ERANGE is stored in errno.
*/
extern _ARMABI unsigned __LONGLONG strtoull(const char * __restrict /*nptr*/,
char ** __restrict /*endptr*/, int /*base*/)
__attribute__((__nonnull__(1)));
/*
* as strtoul but returns an unsigned long long int value. If the correct
* value is outside the range of representable values, ULLONG_MAX is returned,
* and the value of the macro ERANGE is stored in errno.
*/
extern _ARMABI int rand(void);
/*
* Computes a sequence of pseudo-random integers in the range 0 to RAND_MAX.
* Uses an additive generator (Mitchell & Moore) of the form:
* Xn = (X[n-24] + X[n-55]) MOD 2^31
* This is described in section 3.2.2 of Knuth, vol 2. It's period is
* in excess of 2^55 and its randomness properties, though unproven, are
* conjectured to be good. Empirical testing since 1958 has shown no flaws.
* Returns: a pseudo-random integer.
*/
extern _ARMABI void srand(unsigned int /*seed*/);
/*
* uses its argument as a seed for a new sequence of pseudo-random numbers
* to be returned by subsequent calls to rand. If srand is then called with
* the same seed value, the sequence of pseudo-random numbers is repeated.
* If rand is called before any calls to srand have been made, the same
* sequence is generated as when srand is first called with a seed value
* of 1.
*/
struct _rand_state { int __x[57]; };
extern _ARMABI int _rand_r(struct _rand_state *);
extern _ARMABI void _srand_r(struct _rand_state *, unsigned int);
struct _ANSI_rand_state { int __x[1]; };
extern _ARMABI int _ANSI_rand_r(struct _ANSI_rand_state *);
extern _ARMABI void _ANSI_srand_r(struct _ANSI_rand_state *, unsigned int);
/*
* Re-entrant variants of both flavours of rand, which operate on
* an explicitly supplied state buffer.
*/
extern _ARMABI void *calloc(size_t /*nmemb*/, size_t /*size*/);
/*
* allocates space for an array of nmemb objects, each of whose size is
* 'size'. The space is initialised to all bits zero.
* Returns: either a null pointer or a pointer to the allocated space.
*/
extern _ARMABI void free(void * /*ptr*/);
/*
* causes the space pointed to by ptr to be deallocated (i.e., made
* available for further allocation). If ptr is a null pointer, no action
* occurs. Otherwise, if ptr does not match a pointer earlier returned by
* calloc, malloc or realloc or if the space has been deallocated by a call
* to free or realloc, the behaviour is undefined.
*/
extern _ARMABI void *malloc(size_t /*size*/);
/*
* allocates space for an object whose size is specified by 'size' and whose
* value is indeterminate.
* Returns: either a null pointer or a pointer to the allocated space.
*/
extern _ARMABI void *realloc(void * /*ptr*/, size_t /*size*/);
/*
* changes the size of the object pointed to by ptr to the size specified by
* size. The contents of the object shall be unchanged up to the lesser of
* the new and old sizes. If the new size is larger, the value of the newly
* allocated portion of the object is indeterminate. If ptr is a null
* pointer, the realloc function behaves like a call to malloc for the
* specified size. Otherwise, if ptr does not match a pointer earlier
* returned by calloc, malloc or realloc, or if the space has been
* deallocated by a call to free or realloc, the behaviour is undefined.
* If the space cannot be allocated, the object pointed to by ptr is
* unchanged. If size is zero and ptr is not a null pointer, the object it
* points to is freed.
* Returns: either a null pointer or a pointer to the possibly moved
* allocated space.
*/
#if !defined(__STRICT_ANSI__)
extern _ARMABI int posix_memalign(void ** /*ret*/, size_t /*alignment*/, size_t /*size*/);
/*
* allocates space for an object of size 'size', aligned to a
* multiple of 'alignment' (which must be a power of two and at
* least 4).
*
* On success, a pointer to the allocated object is stored in
* *ret, and zero is returned. On failure, the return value is
* either ENOMEM (allocation failed because no suitable piece of
* memory was available) or EINVAL (the 'alignment' parameter was
* invalid).
*/
#endif
typedef int (*__heapprt)(void *, char const *, ...);
extern _ARMABI void __heapstats(int (* /*dprint*/)(void * /*param*/,
char const * /*format*/, ...),
void * /*param*/) __attribute__((__nonnull__(1)));
/*
* reports current heap statistics (eg. number of free blocks in
* the free-list). Output is as implementation-defined free-form
* text, provided via the dprint function. `param' gives an
* extra data word to pass to dprint. You can call
* __heapstats(fprintf,stdout) by casting fprintf to the above
* function type; the typedef `__heapprt' is provided for this
* purpose.
*
* `dprint' will not be called while the heap is being examined,
* so it can allocate memory itself without trouble.
*/
extern _ARMABI int __heapvalid(int (* /*dprint*/)(void * /*param*/,
char const * /*format*/, ...),
void * /*param*/, int /*verbose*/) __attribute__((__nonnull__(1)));
/*
* performs a consistency check on the heap. Errors are reported
* through dprint, like __heapstats. If `verbose' is nonzero,
* full diagnostic information on the heap state is printed out.
*
* This routine probably won't work if the heap isn't a
* contiguous chunk (for example, if __user_heap_extend has been
* overridden).
*
* `dprint' may be called while the heap is being examined or
* even in an invalid state, so it must perform no memory
* allocation. In particular, if `dprint' calls (or is) a stdio
* function, the stream it outputs to must already have either
* been written to or been setvbuf'ed, or else the system will
* allocate buffer space for it on the first call to dprint.
*/
extern _ARMABI_NORETURN void abort(void);
/*
* causes abnormal program termination to occur, unless the signal SIGABRT
* is being caught and the signal handler does not return. Whether open
* output streams are flushed or open streams are closed or temporary
* files removed is implementation-defined.
* An implementation-defined form of the status 'unsuccessful termination'
* is returned to the host environment by means of a call to
* raise(SIGABRT).
*/
extern _ARMABI int atexit(void (* /*func*/)(void)) __attribute__((__nonnull__(1)));
/*
* registers the function pointed to by func, to be called without its
* arguments at normal program termination. It is possible to register at
* least 32 functions.
* Returns: zero if the registration succeeds, nonzero if it fails.
*/
#if defined(__EDG__) && !defined(__GNUC__)
#define __LANGUAGE_LINKAGE_CHANGES_FUNCTION_TYPE
#endif
#if defined(__cplusplus) && defined(__LANGUAGE_LINKAGE_CHANGES_FUNCTION_TYPE)
/* atexit that takes a ptr to a function with C++ linkage
* but not in GNU mode
*/
typedef void (* __C_exitfuncptr)();
extern "C++"
inline int atexit(void (* __func)()) {
return atexit((__C_exitfuncptr)__func);
}
#endif
extern _ARMABI_NORETURN void exit(int /*status*/);
/*
* causes normal program termination to occur. If more than one call to the
* exit function is executed by a program, the behaviour is undefined.
* First, all functions registered by the atexit function are called, in the
* reverse order of their registration.
* Next, all open output streams are flushed, all open streams are closed,
* and all files created by the tmpfile function are removed.
* Finally, control is returned to the host environment. If the value of
* status is zero or EXIT_SUCCESS, an implementation-defined form of the
* status 'successful termination' is returned. If the value of status is
* EXIT_FAILURE, an implementation-defined form of the status
* 'unsuccessful termination' is returned. Otherwise the status returned
* is implementation-defined.
*/
extern _ARMABI_NORETURN void _Exit(int /*status*/);
/*
* causes normal program termination to occur. No functions registered
* by the atexit function are called.
* In this implementation, all open output streams are flushed, all
* open streams are closed, and all files created by the tmpfile function
* are removed.
* Control is returned to the host environment. The status returned to
* the host environment is determined in the same way as for 'exit'.
*/
extern _ARMABI char *getenv(const char * /*name*/) __attribute__((__nonnull__(1)));
/*
* searches the environment list, provided by the host environment, for a
* string that matches the string pointed to by name. The set of environment
* names and the method for altering the environment list are
* implementation-defined.
* Returns: a pointer to a string associated with the matched list member.
* The array pointed to shall not be modified by the program, but
* may be overwritten by a subsequent call to the getenv function.
* If the specified name cannot be found, a null pointer is
* returned.
*/
extern _ARMABI int system(const char * /*string*/);
/*
* passes the string pointed to by string to the host environment to be
* executed by a command processor in an implementation-defined manner.
* A null pointer may be used for string, to inquire whether a command
* processor exists.
*
* Returns: If the argument is a null pointer, the system function returns
* non-zero only if a command processor is available. If the
* argument is not a null pointer, the system function returns an
* implementation-defined value.
*/
extern _ARMABI_THROW void *bsearch(const void * /*key*/, const void * /*base*/,
size_t /*nmemb*/, size_t /*size*/,
int (* /*compar*/)(const void *, const void *)) __attribute__((__nonnull__(1,2,5)));
/*
* searches an array of nmemb objects, the initial member of which is
* pointed to by base, for a member that matches the object pointed to by
* key. The size of each member of the array is specified by size.
* The contents of the array shall be in ascending sorted order according to
* a comparison function pointed to by compar, which is called with two
* arguments that point to the key object and to an array member, in that
* order. The function shall return an integer less than, equal to, or
* greater than zero if the key object is considered, respectively, to be
* less than, to match, or to be greater than the array member.
* Returns: a pointer to a matching member of the array, or a null pointer
* if no match is found. If two members compare as equal, which
* member is matched is unspecified.
*/
#if defined(__cplusplus) && defined(__LANGUAGE_LINKAGE_CHANGES_FUNCTION_TYPE)
/* bsearch that takes a ptr to a function with C++ linkage
* but not in GNU mode
*/
typedef int (* __C_compareprocptr)(const void *, const void *);
extern "C++"
void *bsearch(const void * __key, const void * __base,
size_t __nmemb, size_t __size,
int (* __compar)(const void *, const void *)) __attribute__((__nonnull__(1,2,5)));
extern "C++"
inline void *bsearch(const void * __key, const void * __base,
size_t __nmemb, size_t __size,
int (* __compar)(const void *, const void *)) {
return bsearch(__key, __base, __nmemb, __size, (__C_compareprocptr)__compar);
}
#endif
extern _ARMABI_THROW void qsort(void * /*base*/, size_t /*nmemb*/, size_t /*size*/,
int (* /*compar*/)(const void *, const void *)) __attribute__((__nonnull__(1,4)));
/*
* sorts an array of nmemb objects, the initial member of which is pointed
* to by base. The size of each object is specified by size.
* The contents of the array shall be in ascending order according to a
* comparison function pointed to by compar, which is called with two
* arguments that point to the objects being compared. The function shall
* return an integer less than, equal to, or greater than zero if the first
* argument is considered to be respectively less than, equal to, or greater
* than the second. If two members compare as equal, their order in the
* sorted array is unspecified.
*/
#if defined(__cplusplus) && defined(__LANGUAGE_LINKAGE_CHANGES_FUNCTION_TYPE)
/* qsort that takes a ptr to a function with C++ linkage
* but not in GNU mode
*/
extern "C++"
void qsort(void * __base, size_t __nmemb, size_t __size,
int (* __compar)(const void *, const void *)) __attribute__((__nonnull__(1,4)));
extern "C++"
inline void qsort(void * __base, size_t __nmemb, size_t __size,
int (* __compar)(const void *, const void *)) {
qsort(__base, __nmemb, __size, (__C_compareprocptr)__compar);
}
#endif
extern _ARMABI_PURE int abs(int /*j*/);
/*
* computes the absolute value of an integer j. If the result cannot be
* represented, the behaviour is undefined.
* Returns: the absolute value.
*/
extern _ARMABI_PURE div_t div(int /*numer*/, int /*denom*/);
/*
* computes the quotient and remainder of the division of the numerator
* numer by the denominator denom. If the division is inexact, the resulting
* quotient is the integer of lesser magnitude that is the nearest to the
* algebraic quotient. If the result cannot be represented, the behaviour is
* undefined; otherwise, quot * denom + rem shall equal numer.
* Returns: a structure of type div_t, comprising both the quotient and the
* remainder. the structure shall contain the following members,
* in either order.
* int quot; int rem;
*/
extern _ARMABI_PURE long int labs(long int /*j*/);
/*
* computes the absolute value of an long integer j. If the result cannot be
* represented, the behaviour is undefined.
* Returns: the absolute value.
*/
#ifdef __cplusplus
extern "C++" inline _ARMABI_PURE long abs(long int x) { return labs(x); }
#endif
extern _ARMABI_PURE ldiv_t ldiv(long int /*numer*/, long int /*denom*/);
/*
* computes the quotient and remainder of the division of the numerator
* numer by the denominator denom. If the division is inexact, the sign of
* the resulting quotient is that of the algebraic quotient, and the
* magnitude of the resulting quotient is the largest integer less than the
* magnitude of the algebraic quotient. If the result cannot be represented,
* the behaviour is undefined; otherwise, quot * denom + rem shall equal
* numer.
* Returns: a structure of type ldiv_t, comprising both the quotient and the
* remainder. the structure shall contain the following members,
* in either order.
* long int quot; long int rem;
*/
#ifdef __cplusplus
extern "C++" inline _ARMABI_PURE ldiv_t div(long int __numer, long int __denom) {
return ldiv(__numer, __denom);
}
#endif
#if !defined(__STRICT_ANSI__) || __USE_C99_STDLIB
extern _ARMABI_PURE __LONGLONG llabs(__LONGLONG /*j*/);
/*
* computes the absolute value of a long long integer j. If the
* result cannot be represented, the behaviour is undefined.
* Returns: the absolute value.
*/
#ifdef __cplusplus
extern "C++" inline _ARMABI_PURE __LONGLONG abs(__LONGLONG x) { return llabs(x); }
#endif
extern _ARMABI_PURE lldiv_t lldiv(__LONGLONG /*numer*/, __LONGLONG /*denom*/);
/*
* computes the quotient and remainder of the division of the numerator
* numer by the denominator denom. If the division is inexact, the sign of
* the resulting quotient is that of the algebraic quotient, and the
* magnitude of the resulting quotient is the largest integer less than the
* magnitude of the algebraic quotient. If the result cannot be represented,
* the behaviour is undefined; otherwise, quot * denom + rem shall equal
* numer.
* Returns: a structure of type lldiv_t, comprising both the quotient and the
* remainder. the structure shall contain the following members,
* in either order.
* long long quot; long long rem;
*/
#ifdef __cplusplus
extern "C++" inline _ARMABI_PURE lldiv_t div(__LONGLONG __numer, __LONGLONG __denom) {
return lldiv(__numer, __denom);
}
#endif
#endif
#if !(__ARM_NO_DEPRECATED_FUNCTIONS)
/*
* ARM real-time divide functions for guaranteed performance
*/
typedef struct __sdiv32by16 { int quot, rem; } __sdiv32by16;
typedef struct __udiv32by16 { unsigned int quot, rem; } __udiv32by16;
/* used int so that values return in separate regs, although 16-bit */
typedef struct __sdiv64by32 { int rem, quot; } __sdiv64by32;
__value_in_regs extern _ARMABI_PURE __sdiv32by16 __rt_sdiv32by16(
int /*numer*/,
short int /*denom*/);
/*
* Signed divide: (16-bit quot), (16-bit rem) = (32-bit) / (16-bit)
*/
__value_in_regs extern _ARMABI_PURE __udiv32by16 __rt_udiv32by16(
unsigned int /*numer*/,
unsigned short /*denom*/);
/*
* Unsigned divide: (16-bit quot), (16-bit rem) = (32-bit) / (16-bit)
*/
__value_in_regs extern _ARMABI_PURE __sdiv64by32 __rt_sdiv64by32(
int /*numer_h*/, unsigned int /*numer_l*/,
int /*denom*/);
/*
* Signed divide: (32-bit quot), (32-bit rem) = (64-bit) / (32-bit)
*/
#endif
/*
* ARM floating-point mask/status function (for both hardfp and softfp)
*/
extern _ARMABI unsigned int __fp_status(unsigned int /*mask*/, unsigned int /*flags*/);
/*
* mask and flags are bit-fields which correspond directly to the
* floating point status register in the FPE/FPA and fplib.
* __fp_status returns the current value of the status register,
* and also sets the writable bits of the word
* (the exception control and flag bytes) to:
*
* new = (old & ~mask) ^ flags;
*/
#define __fpsr_IXE 0x100000
#define __fpsr_UFE 0x80000
#define __fpsr_OFE 0x40000
#define __fpsr_DZE 0x20000
#define __fpsr_IOE 0x10000
#define __fpsr_IXC 0x10
#define __fpsr_UFC 0x8
#define __fpsr_OFC 0x4
#define __fpsr_DZC 0x2
#define __fpsr_IOC 0x1
/*
* Multibyte Character Functions.
* The behaviour of the multibyte character functions is affected by the
* LC_CTYPE category of the current locale. For a state-dependent encoding,
* each function is placed into its initial state by a call for which its
* character pointer argument, s, is a null pointer. Subsequent calls with s
* as other than a null pointer cause the internal state of the function to be
* altered as necessary. A call with s as a null pointer causes these functions
* to return a nonzero value if encodings have state dependency, and a zero
* otherwise. After the LC_CTYPE category is changed, the shift state of these
* functions is indeterminate.
*/
extern _ARMABI int mblen(const char * /*s*/, size_t /*n*/);
/*
* If s is not a null pointer, the mblen function determines the number of
* bytes compromising the multibyte character pointed to by s. Except that
* the shift state of the mbtowc function is not affected, it is equivalent
* to mbtowc((wchar_t *)0, s, n);
* Returns: If s is a null pointer, the mblen function returns a nonzero or
* zero value, if multibyte character encodings, respectively, do
* or do not have state-dependent encodings. If s is not a null
* pointer, the mblen function either returns a 0 (if s points to a
* null character), or returns the number of bytes that compromise
* the multibyte character (if the next n of fewer bytes form a
* valid multibyte character), or returns -1 (they do not form a
* valid multibyte character).
*/
extern _ARMABI int mbtowc(wchar_t * __restrict /*pwc*/,
const char * __restrict /*s*/, size_t /*n*/);
/*
* If s is not a null pointer, the mbtowc function determines the number of
* bytes that compromise the multibyte character pointed to by s. It then
* determines the code for value of type wchar_t that corresponds to that
* multibyte character. (The value of the code corresponding to the null
* character is zero). If the multibyte character is valid and pwc is not a
* null pointer, the mbtowc function stores the code in the object pointed
* to by pwc. At most n bytes of the array pointed to by s will be examined.
* Returns: If s is a null pointer, the mbtowc function returns a nonzero or
* zero value, if multibyte character encodings, respectively, do
* or do not have state-dependent encodings. If s is not a null
* pointer, the mbtowc function either returns a 0 (if s points to
* a null character), or returns the number of bytes that
* compromise the converted multibyte character (if the next n of
* fewer bytes form a valid multibyte character), or returns -1
* (they do not form a valid multibyte character).
*/
extern _ARMABI int wctomb(char * /*s*/, wchar_t /*wchar*/);
/*
* determines the number of bytes need to represent the multibyte character
* corresponding to the code whose value is wchar (including any change in
* shift state). It stores the multibyte character representation in the
* array object pointed to by s (if s is not a null pointer). At most
* MB_CUR_MAX characters are stored. If the value of wchar is zero, the
* wctomb function is left in the initial shift state).
* Returns: If s is a null pointer, the wctomb function returns a nonzero or
* zero value, if multibyte character encodings, respectively, do
* or do not have state-dependent encodings. If s is not a null
* pointer, the wctomb function returns a -1 if the value of wchar
* does not correspond to a valid multibyte character, or returns
* the number of bytes that compromise the multibyte character
* corresponding to the value of wchar.
*/
/*
* Multibyte String Functions.
* The behaviour of the multibyte string functions is affected by the LC_CTYPE
* category of the current locale.
*/
extern _ARMABI size_t mbstowcs(wchar_t * __restrict /*pwcs*/,
const char * __restrict /*s*/, size_t /*n*/) __attribute__((__nonnull__(2)));
/*
* converts a sequence of multibyte character that begins in the initial
* shift state from the array pointed to by s into a sequence of
* corresponding codes and stores not more than n codes into the array
* pointed to by pwcs. No multibyte character that follow a null character
* (which is converted into a code with value zero) will be examined or
* converted. Each multibyte character is converted as if by a call to
* mbtowc function, except that the shift state of the mbtowc function is
* not affected. No more than n elements will be modified in the array
* pointed to by pwcs. If copying takes place between objects that overlap,
* the behaviour is undefined.
* Returns: If an invalid multibyte character is encountered, the mbstowcs
* function returns (size_t)-1. Otherwise, the mbstowcs function
* returns the number of array elements modified, not including
* a terminating zero code, if any.
*/
extern _ARMABI size_t wcstombs(char * __restrict /*s*/,
const wchar_t * __restrict /*pwcs*/, size_t /*n*/) __attribute__((__nonnull__(2)));
/*
* converts a sequence of codes that correspond to multibyte characters
* from the array pointed to by pwcs into a sequence of multibyte
* characters that begins in the initial shift state and stores these
* multibyte characters into the array pointed to by s, stopping if a
* multibyte character would exceed the limit of n total bytes or if a
* null character is stored. Each code is converted as if by a call to the
* wctomb function, except that the shift state of the wctomb function is
* not affected. No more than n elements will be modified in the array
* pointed to by s. If copying takes place between objects that overlap,
* the behaviour is undefined.
* Returns: If a code is encountered that does not correspond to a valid
* multibyte character, the wcstombs function returns (size_t)-1.
* Otherwise, the wcstombs function returns the number of bytes
* modified, not including a terminating null character, if any.
*/
extern _ARMABI void __use_realtime_heap(void);
extern _ARMABI void __use_realtime_division(void);
extern _ARMABI void __use_two_region_memory(void);
extern _ARMABI void __use_no_heap(void);
extern _ARMABI void __use_no_heap_region(void);
extern _ARMABI char const *__C_library_version_string(void);
extern _ARMABI int __C_library_version_number(void);
#ifdef __cplusplus
} /* extern "C" */
} /* namespace std */
#endif /* __cplusplus */
#endif /* __STDLIB_DECLS */
#if _AEABI_PORTABILITY_LEVEL != 0 && !defined _AEABI_PORTABLE
#define _AEABI_PORTABLE
#endif
#ifdef __cplusplus
#ifndef __STDLIB_NO_EXPORTS
#if !defined(__STRICT_ANSI__) || __USE_C99_STDLIB
using ::std::atoll;
using ::std::lldiv_t;
#endif /* !defined(__STRICT_ANSI__) || __USE_C99_STDLIB */
using ::std::div_t;
using ::std::ldiv_t;
using ::std::atof;
using ::std::atoi;
using ::std::atol;
using ::std::strtod;
#if !defined(__STRICT_ANSI__) || __USE_C99_STDLIB
using ::std::strtof;
using ::std::strtold;
#endif
using ::std::strtol;
using ::std::strtoul;
using ::std::strtoll;
using ::std::strtoull;
using ::std::rand;
using ::std::srand;
using ::std::_rand_state;
using ::std::_rand_r;
using ::std::_srand_r;
using ::std::_ANSI_rand_state;
using ::std::_ANSI_rand_r;
using ::std::_ANSI_srand_r;
using ::std::calloc;
using ::std::free;
using ::std::malloc;
using ::std::realloc;
#if !defined(__STRICT_ANSI__)
using ::std::posix_memalign;
#endif
using ::std::__heapprt;
using ::std::__heapstats;
using ::std::__heapvalid;
using ::std::abort;
using ::std::atexit;
using ::std::exit;
using ::std::_Exit;
using ::std::getenv;
using ::std::system;
using ::std::bsearch;
using ::std::qsort;
using ::std::abs;
using ::std::div;
using ::std::labs;
using ::std::ldiv;
#if !defined(__STRICT_ANSI__) || __USE_C99_STDLIB
using ::std::llabs;
using ::std::lldiv;
#endif /* !defined(__STRICT_ANSI__) || __USE_C99_STDLIB */
#if !(__ARM_NO_DEPRECATED_FUNCTIONS)
using ::std::__sdiv32by16;
using ::std::__udiv32by16;
using ::std::__sdiv64by32;
using ::std::__rt_sdiv32by16;
using ::std::__rt_udiv32by16;
using ::std::__rt_sdiv64by32;
#endif
using ::std::__fp_status;
using ::std::mblen;
using ::std::mbtowc;
using ::std::wctomb;
using ::std::mbstowcs;
using ::std::wcstombs;
using ::std::__use_realtime_heap;
using ::std::__use_realtime_division;
using ::std::__use_two_region_memory;
using ::std::__use_no_heap;
using ::std::__use_no_heap_region;
using ::std::__C_library_version_string;
using ::std::__C_library_version_number;
using ::std::size_t;
using ::std::__aeabi_MB_CUR_MAX;
#endif /* __STDLIB_NO_EXPORTS */
#endif /* __cplusplus */
#undef __LONGLONG
#endif /* __stdlib_h */
/* end of stdlib.h */
这是啥
本文深入探讨了C++编程中头文件的#ifndef和externC的关键概念及应用，包括如何解决声明冲突、函数在C++和C++之间的调用问题，以及如何在不同编译环境下正确使用externC来避免链接失败。通过实例分析，详细解释了头文件中的#ifndef和externC的具体用法。
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