glibc/timezone/private.h

#ifndef PRIVATE_H

#define PRIVATE_H

/*
** This file is in the public domain, so clarified as of
** 1996-06-05 by Arthur David Olson.
*/

/*
** This header is for use ONLY with the time conversion code.
** There is no guarantee that it will remain unchanged,
** or that it will remain at all.
** Do NOT copy it to any system include directory.
** Thank you!
*/

#define GRANDPARENTED	"Local time zone must be set--see zic manual page"

/*
** Defaults for preprocessor symbols.
** You can override these in your C compiler options, e.g. `-DHAVE_ADJTIME=0'.
*/

#ifndef HAVE_ADJTIME
#define HAVE_ADJTIME		1
#endif /* !defined HAVE_ADJTIME */

#ifndef HAVE_GETTEXT
#define HAVE_GETTEXT		0
#endif /* !defined HAVE_GETTEXT */

#ifndef HAVE_INCOMPATIBLE_CTIME_R
#define HAVE_INCOMPATIBLE_CTIME_R	0
#endif /* !defined INCOMPATIBLE_CTIME_R */

#ifndef HAVE_LINK
#define HAVE_LINK		1
#endif /* !defined HAVE_LINK */

#ifndef HAVE_SETTIMEOFDAY
#define HAVE_SETTIMEOFDAY	3
#endif /* !defined HAVE_SETTIMEOFDAY */

#ifndef HAVE_SYMLINK
#define HAVE_SYMLINK		1
#endif /* !defined HAVE_SYMLINK */

#ifndef HAVE_SYS_STAT_H
#define HAVE_SYS_STAT_H		1
#endif /* !defined HAVE_SYS_STAT_H */

#ifndef HAVE_SYS_WAIT_H
#define HAVE_SYS_WAIT_H		1
#endif /* !defined HAVE_SYS_WAIT_H */

#ifndef HAVE_UNISTD_H
#define HAVE_UNISTD_H		1
#endif /* !defined HAVE_UNISTD_H */

#ifndef HAVE_UTMPX_H
#define HAVE_UTMPX_H		0
#endif /* !defined HAVE_UTMPX_H */

#ifndef LOCALE_HOME
#define LOCALE_HOME		"/usr/lib/locale"
#endif /* !defined LOCALE_HOME */

#if HAVE_INCOMPATIBLE_CTIME_R
#define asctime_r _incompatible_asctime_r
#define ctime_r _incompatible_ctime_r
#endif /* HAVE_INCOMPATIBLE_CTIME_R */

/*
** Nested includes
*/

#include "sys/types.h"	/* for time_t */
#include "stdio.h"
#include "errno.h"
#include "string.h"
#include "limits.h"	/* for CHAR_BIT et al. */
#include "time.h"
#include "stdlib.h"

#if HAVE_GETTEXT
#include "libintl.h"
#endif /* HAVE_GETTEXT */

#if HAVE_SYS_WAIT_H
#include <sys/wait.h>	/* for WIFEXITED and WEXITSTATUS */
#endif /* HAVE_SYS_WAIT_H */

#ifndef WIFEXITED
#define WIFEXITED(status)	(((status) & 0xff) == 0)
#endif /* !defined WIFEXITED */
#ifndef WEXITSTATUS
#define WEXITSTATUS(status)	(((status) >> 8) & 0xff)
#endif /* !defined WEXITSTATUS */

#if HAVE_UNISTD_H
#include "unistd.h"	/* for F_OK, R_OK, and other POSIX goodness */
#endif /* HAVE_UNISTD_H */

#ifndef F_OK
#define F_OK	0
#endif /* !defined F_OK */
#ifndef R_OK
#define R_OK	4
#endif /* !defined R_OK */

/* Unlike <ctype.h>'s isdigit, this also works if c < 0 | c > UCHAR_MAX. */
#define is_digit(c) ((unsigned)(c) - '0' <= 9)

/*
** Define HAVE_STDINT_H's default value here, rather than at the
** start, since __GLIBC__'s value depends on previously-included
** files.
** (glibc 2.1 and later have stdint.h, even with pre-C99 compilers.)
*/
#ifndef HAVE_STDINT_H
#define HAVE_STDINT_H \
   (199901 <= __STDC_VERSION__ \
    || 2 < __GLIBC__ + (1 <= __GLIBC_MINOR__)	\
    || __CYGWIN__)
#endif /* !defined HAVE_STDINT_H */

#if HAVE_STDINT_H
#include "stdint.h"
#endif /* !HAVE_STDINT_H */

#ifndef HAVE_INTTYPES_H
# define HAVE_INTTYPES_H HAVE_STDINT_H
#endif
#if HAVE_INTTYPES_H
# include <inttypes.h>
#endif

#ifndef INT_FAST64_MAX
/* Pre-C99 GCC compilers define __LONG_LONG_MAX__ instead of LLONG_MAX.  */
#if defined LLONG_MAX || defined __LONG_LONG_MAX__
typedef long long	int_fast64_t;
# ifdef LLONG_MAX
#  define INT_FAST64_MIN LLONG_MIN
#  define INT_FAST64_MAX LLONG_MAX
# else
#  define INT_FAST64_MIN __LONG_LONG_MIN__
#  define INT_FAST64_MAX __LONG_LONG_MAX__
# endif
# define SCNdFAST64 "lld"
#else /* ! (defined LLONG_MAX || defined __LONG_LONG_MAX__) */
#if (LONG_MAX >> 31) < 0xffffffff
Please use a compiler that supports a 64-bit integer type (or wider);
you may need to compile with "-DHAVE_STDINT_H".
#endif /* (LONG_MAX >> 31) < 0xffffffff */
typedef long		int_fast64_t;
# define INT_FAST64_MIN LONG_MIN
# define INT_FAST64_MAX LONG_MAX
# define SCNdFAST64 "ld"
#endif /* ! (defined LLONG_MAX || defined __LONG_LONG_MAX__) */
#endif /* !defined INT_FAST64_MAX */

#ifndef INT_FAST32_MAX
# if INT_MAX >> 31 == 0
typedef long int_fast32_t;
# else
typedef int int_fast32_t;
# endif
#endif

#ifndef INTMAX_MAX
# if defined LLONG_MAX || defined __LONG_LONG_MAX__
typedef long long intmax_t;
#  define strtoimax strtoll
#  define PRIdMAX "lld"
#  ifdef LLONG_MAX
#   define INTMAX_MAX LLONG_MAX
#   define INTMAX_MIN LLONG_MIN
#  else
#   define INTMAX_MAX __LONG_LONG_MAX__
#   define INTMAX_MIN __LONG_LONG_MIN__
#  endif
# else
typedef long intmax_t;
#  define strtoimax strtol
#  define PRIdMAX "ld"
#  define INTMAX_MAX LONG_MAX
#  define INTMAX_MIN LONG_MIN
# endif
#endif

#ifndef UINTMAX_MAX
# if defined ULLONG_MAX || defined __LONG_LONG_MAX__
typedef unsigned long long uintmax_t;
#  define PRIuMAX "llu"
# else
typedef unsigned long uintmax_t;
#  define PRIuMAX "lu"
# endif
#endif

#ifndef INT32_MAX
#define INT32_MAX 0x7fffffff
#endif /* !defined INT32_MAX */
#ifndef INT32_MIN
#define INT32_MIN (-1 - INT32_MAX)
#endif /* !defined INT32_MIN */

#ifndef SIZE_MAX
#define SIZE_MAX ((size_t) -1)
#endif

#if 2 < __GNUC__ + (96 <= __GNUC_MINOR__)
# define ATTRIBUTE_CONST __attribute__ ((const))
# define ATTRIBUTE_PURE __attribute__ ((__pure__))
# define ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
#else
# define ATTRIBUTE_CONST /* empty */
# define ATTRIBUTE_PURE /* empty */
# define ATTRIBUTE_FORMAT(spec) /* empty */
#endif

#if !defined _Noreturn && __STDC_VERSION__ < 201112
# if 2 < __GNUC__ + (8 <= __GNUC_MINOR__)
#  define _Noreturn __attribute__ ((__noreturn__))
# else
#  define _Noreturn
# endif
#endif

#if __STDC_VERSION__ < 199901 && !defined restrict
# define restrict /* empty */
#endif

/*
** Workarounds for compilers/systems.
*/

/*
** Some time.h implementations don't declare asctime_r.
** Others might define it as a macro.
** Fix the former without affecting the latter.
*/

#ifndef asctime_r
extern char *	asctime_r(struct tm const *, char *);
#endif

/*
** Compile with -Dtime_tz=T to build the tz package with a private
** time_t type equivalent to T rather than the system-supplied time_t.
** This debugging feature can test unusual design decisions
** (e.g., time_t wider than 'long', or unsigned time_t) even on
** typical platforms.
*/
#ifdef time_tz
static time_t sys_time(time_t *x) { return time(x); }

# undef  ctime
# define ctime tz_ctime
# undef  ctime_r
# define ctime_r tz_ctime_r
# undef  difftime
# define difftime tz_difftime
# undef  gmtime
# define gmtime tz_gmtime
# undef  gmtime_r
# define gmtime_r tz_gmtime_r
# undef  localtime
# define localtime tz_localtime
# undef  localtime_r
# define localtime_r tz_localtime_r
# undef  mktime
# define mktime tz_mktime
# undef  time
# define time tz_time
# undef  time_t
# define time_t tz_time_t

typedef time_tz time_t;

char *ctime(time_t const *);
char *ctime_r(time_t const *, char *);
double difftime(time_t, time_t);
struct tm *gmtime(time_t const *);
struct tm *gmtime_r(time_t const *restrict, struct tm *restrict);
struct tm *localtime(time_t const *);
struct tm *localtime_r(time_t const *restrict, struct tm *restrict);
time_t mktime(struct tm *);

static time_t
time(time_t *p)
{
	time_t r = sys_time(0);
	if (p)
		*p = r;
	return r;
}
#endif

/*
** Private function declarations.
*/

char *		icatalloc(char * old, const char * new);
char *		icpyalloc(const char * string);
const char *	scheck(const char * string, const char * format);

/*
** Finally, some convenience items.
*/

#ifndef TRUE
#define TRUE	1
#endif /* !defined TRUE */

#ifndef FALSE
#define FALSE	0
#endif /* !defined FALSE */

#ifndef TYPE_BIT
#define TYPE_BIT(type)	(sizeof (type) * CHAR_BIT)
#endif /* !defined TYPE_BIT */

#ifndef TYPE_SIGNED
#define TYPE_SIGNED(type) (((type) -1) < 0)
#endif /* !defined TYPE_SIGNED */

/* The minimum and maximum finite time values.  */
static time_t const time_t_min =
  (TYPE_SIGNED(time_t)
   ? (time_t) -1 << (CHAR_BIT * sizeof (time_t) - 1)
   : 0);
static time_t const time_t_max =
  (TYPE_SIGNED(time_t)
   ? - (~ 0 < 0) - ((time_t) -1 << (CHAR_BIT * sizeof (time_t) - 1))
   : -1);

#ifndef INT_STRLEN_MAXIMUM
/*
** 302 / 1000 is log10(2.0) rounded up.
** Subtract one for the sign bit if the type is signed;
** add one for integer division truncation;
** add one more for a minus sign if the type is signed.
*/
#define INT_STRLEN_MAXIMUM(type) \
	((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + \
	1 + TYPE_SIGNED(type))
#endif /* !defined INT_STRLEN_MAXIMUM */

/*
** INITIALIZE(x)
*/

#ifndef GNUC_or_lint
#ifdef lint
#define GNUC_or_lint
#endif /* defined lint */
#ifndef lint
#ifdef __GNUC__
#define GNUC_or_lint
#endif /* defined __GNUC__ */
#endif /* !defined lint */
#endif /* !defined GNUC_or_lint */

#ifndef INITIALIZE
#ifdef GNUC_or_lint
#define INITIALIZE(x)	((x) = 0)
#endif /* defined GNUC_or_lint */
#ifndef GNUC_or_lint
#define INITIALIZE(x)
#endif /* !defined GNUC_or_lint */
#endif /* !defined INITIALIZE */

/*
** For the benefit of GNU folk...
** `_(MSGID)' uses the current locale's message library string for MSGID.
** The default is to use gettext if available, and use MSGID otherwise.
*/

#ifndef _
#if HAVE_GETTEXT
#define _(msgid) gettext(msgid)
#else /* !HAVE_GETTEXT */
#define _(msgid) msgid
#endif /* !HAVE_GETTEXT */
#endif /* !defined _ */

#ifndef TZ_DOMAIN
#define TZ_DOMAIN "tz"
#endif /* !defined TZ_DOMAIN */

#if HAVE_INCOMPATIBLE_CTIME_R
#undef asctime_r
#undef ctime_r
char *asctime_r(struct tm const *, char *);
char *ctime_r(time_t const *, char *);
#endif /* HAVE_INCOMPATIBLE_CTIME_R */

#ifndef YEARSPERREPEAT
#define YEARSPERREPEAT		400	/* years before a Gregorian repeat */
#endif /* !defined YEARSPERREPEAT */

/*
** The Gregorian year averages 365.2425 days, which is 31556952 seconds.
*/

#ifndef AVGSECSPERYEAR
#define AVGSECSPERYEAR		31556952L
#endif /* !defined AVGSECSPERYEAR */

#ifndef SECSPERREPEAT
#define SECSPERREPEAT		((int_fast64_t) YEARSPERREPEAT * (int_fast64_t) AVGSECSPERYEAR)
#endif /* !defined SECSPERREPEAT */

#ifndef SECSPERREPEAT_BITS
#define SECSPERREPEAT_BITS	34	/* ceil(log2(SECSPERREPEAT)) */
#endif /* !defined SECSPERREPEAT_BITS */

/*
** UNIX was a registered trademark of The Open Group in 2003.
*/

#endif /* !defined PRIVATE_H */