MEMSCAN(9) Basic C Library Functions MEMSCAN(9)NAME
memscan - Find a character in an area of memory.
SYNOPSIS
void * memscan(void * addr, int c, size_t size);
ARGUMENTS
addr
The memory area
c
The byte to search for
size
The size of the area.
DESCRIPTION
returns the address of the first occurrence of c, or 1 byte past the area if c is not found
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 MEMSCAN(9)
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memory(3) Library Functions Manual memory(3)Name
memccpy, memchr, memcmp, memcpy, memmove, memset - memory operations
Syntax
#include <string.h>
void *memccpy (s1, s2, c, n)
void *s1, *s2;
int c;
size_t n;
void *memchr (s, c, n)
void *s;
int c;
size_t n;
int memcmp (s1, s2, n)
void *s1, *s2;
size_t n;
void *memcpy (s1, s2, n)
void *s1, *s2;
size_t n;
void *memset (s, c, n)
void *s;
int c;
size_t n;
void *memmove (s1, s2, n)
void *s1, *s2;
size_t n;
Description
These functions operate efficiently on memory areas (arrays of characters bounded by a count, not terminated by a null character). They do
not check for the overflow of any receiving memory area.
The subroutine copies characters from memory area s2 into s1, stopping after the first occurrence of character c has been copied, or after
n characters have been copied, whichever comes first. It returns a pointer to the character after the copy of c in s1, or a NULL pointer
if c was not found in the first n characters of s2.
The subroutine returns a pointer to the first occurrence of character c in the first n characters of memory area s, or a NULL pointer if c
does not occur.
The subroutine compares its arguments, looking at the first n characters only, and returns an integer less than, equal to, or greater than
0, according as s1 is lexicographically less than, equal to, or greater than s2.
The subroutine copies n characters from memory area s2 to s1. It returns s1.
The subroutine is like , except that if s1 and s2 specify overlapping areas, works as if an intermediate buffer is used.
The subroutine sets the first n characters in memory area s to the value of character c. It returns s.
Restrictions
The subroutine uses native character comparison, which is signed on PDP-11s, unsigned on other machines.
Character movement is performed differently in different implementations of and Thus overlapping moves, using these subroutines, may yield
unpredictable results.
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