limits.h

#ifndef _LIMITS_H
#define _LIMITS_H

/* Most limits are system-specific */

#include <bits/limits.h>

/* Some universal constants... */

#define CHAR_BIT 8
#define SCHAR_MIN (-128)
#define SCHAR_MAX 127
#define UCHAR_MAX 255
#define CHAR_MIN (-128)
#define CHAR_MAX 127

#define MB_LEN_MAX 4

#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
 || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE)

#define SSIZE_MAX LONG_MAX
#define TZNAME_MAX 6
#define TTY_NAME_MAX 20
#define HOST_NAME_MAX 255

/* Implementation choices... */

#define PTHREAD_KEYS_MAX  1024
#define PTHREAD_STACK_MIN PAGE_SIZE
#define PTHREAD_DESTRUCTOR_ITERATIONS 4

/* Arbitrary numbers... */

#define BC_BASE_MAX 99
#define BC_DIM_MAX 2048
#define BC_SCALE_MAX 99
#define BC_STRING_MAX 1000
#define CHARCLASS_NAME_MAX 14
#define COLL_WEIGHTS_MAX 2
#define EXPR_NEST_MAX 32
#define LINE_MAX 4096
#define RE_DUP_MAX 255

#define NL_ARGMAX 9
#define NL_LANGMAX 32
#define NL_MSGMAX 32767
#define NL_NMAX (MB_LEN_MAX*4)
#define NL_SETMAX 255
#define NL_TEXTMAX 2048

/* POSIX/SUS requirements follow. These numbers come directly
 * from SUS and have nothing to do with the host system. */

#define _POSIX_AIO_LISTIO_MAX   2
#define _POSIX_AIO_MAX          1
#define _POSIX_ARG_MAX          4096
#define _POSIX_CHILD_MAX        25
#define _POSIX_DELAYTIMER_MAX   32
#define _POSIX_HOST_NAME_MAX    255
#define _POSIX_LINK_MAX         8
#define _POSIX_LOGIN_NAME_MAX   9
#define _POSIX_MAX_CANON        255
#define _POSIX_MAX_INPUT        255
#define _POSIX_MQ_OPEN_MAX      8
#define _POSIX_MQ_PRIO_MAX      32
#define _POSIX_NAME_MAX         14
#define _POSIX_NGROUPS_MAX      8
#define _POSIX_OPEN_MAX         20
#define _POSIX_PATH_MAX         256
#define _POSIX_PIPE_BUF         512
#define _POSIX_RE_DUP_MAX       255
#define _POSIX_RTSIG_MAX        8
#define _POSIX_SEM_NSEMS_MAX    256
#define _POSIX_SEM_VALUE_MAX    32767
#define _POSIX_SIGQUEUE_MAX     32
#define _POSIX_SSIZE_MAX        32767
#define _POSIX_STREAM_MAX       8
#define _POSIX_SS_REPL_MAX      4
#define _POSIX_SYMLINK_MAX      255
#define _POSIX_SYMLOOP_MAX      8
#define _POSIX_THREAD_DESTRUCTOR_ITERATIONS 4
#define _POSIX_THREAD_KEYS_MAX  128
#define _POSIX_THREAD_THREADS_MAX 64
#define _POSIX_TIMER_MAX        32
#define _POSIX_TRACE_EVENT_NAME_MAX 30
#define _POSIX_TRACE_NAME_MAX   8
#define _POSIX_TRACE_SYS_MAX    8
#define _POSIX_TRACE_USER_EVENT_MAX 32
#define _POSIX_TTY_NAME_MAX     9
#define _POSIX_TZNAME_MAX       6
#define _POSIX2_BC_BASE_MAX     99
#define _POSIX2_BC_DIM_MAX      2048
#define _POSIX2_BC_SCALE_MAX    99
#define _POSIX2_BC_STRING_MAX   1000
#define _POSIX2_CHARCLASS_NAME_MAX 14
#define _POSIX2_COLL_WEIGHTS_MAX 2
#define _POSIX2_EXPR_NEST_MAX   32
#define _POSIX2_LINE_MAX        2048
#define _POSIX2_RE_DUP_MAX      255

#define _XOPEN_IOV_MAX          16
#define _XOPEN_NAME_MAX         255
#define _XOPEN_PATH_MAX         1024

#endif

#endif