NAME

       intptr_t, uintptr_t - integer types wide enough to hold pointers

LIBRARY

       Standard C library (libc)

SYNOPSIS

       #include <stdint.h>

       typedef /* ... */ intptr_t;
       typedef /* ... */ uintptr_t;

       #define INTPTR_WIDTH  /* ... */
       #define UINTPTR_WIDTH INTPTR_WIDTH

       #define INTPTR_MAX    /*  2**(INTPTR_WIDTH - 1) - 1  */
       #define INTPTR_MIN    /*  - 2**(INTPTR_WIDTH - 1)    */
       #define UINTPTR_MAX   /*  2**UINTPTR_WIDTH - 1       */

DESCRIPTION

       intptr_t  is  a signed integer type such that any valid (void *) value can be converted to
       this type and then converted  back.   It  is  capable  of  storing  values  in  the  range
       [INTPTR_MIN, INTPTR_MAX].

       uintptr_t  is an unsigned integer type such that any valid (void *) value can be converted
       to this type and then converted back.  It is capable of storing values in  the  range  [0,
       INTPTR_MAX].

       The macros [U]INTPTR_WIDTH expand to the width in bits of these types.

       The macros [U]INTPTR_MAX expand to the maximum value that these types can hold.

       The macro INTPTR_MIN expands to the minimum value that intptr_t can hold.

       The  length  modifiers for the [u]intptr_t types for the printf(3) family of functions are
       expanded by the macros PRIdPTR, PRIiPTR, and PRIuPTR (defined in <inttypes.h>);  resulting
       commonly  in  %"PRIdPTR" or %"PRIiPTR" for printing intptr_t values.  The length modifiers
       for the [u]intptr_t types for the scanf(3) family of functions are expanded by the  macros
       SCNdPTR,  SCNiPTR, and SCNuPTR (defined in <inttypes.h>); resulting commonly in %"SCNuPTR"
       for scanning uintptr_t values.

STANDARDS

       C11, POSIX.1-2008.

HISTORY

       C99, POSIX.1-2001.

NOTES

       The following header also provides these types: <inttypes.h>.

SEE ALSO

       intmax_t(3type), void(3)