NAME
intptr_t, uintptr_t - integer types wide enough to hold pointers
LIBRARY
Standard C library (libc)
SYNOPSIS
#include <stdint.h>typedef\n /* ... */ \nintptr_t;\n
\ntypedef\n /* ... */ \nuintptr_t;#define INTPTR_WIDTH\n /* ... */
\n#define UINTPTR_WIDTH INTPTR_WIDTH#define INTPTR_MAX\n /* 2**(INTPTR_WIDTH - 1) - 1 */
\n#define INTPTR_MIN\n /* - 2**(INTPTR_WIDTH - 1) */
\n#define UINTPTR_MAX\n /* 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)