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memccpy(3)							    memccpy(3)

NAME
       memccpy, memchr, memcmp, memcpy, memmove, memset - Perform memory oper‐
       ations

SYNOPSIS
       #include <string.h>

       void *memccpy(
	       void *s1,
	       const void *s2,
	       int c,
	       size_t n ); void *memchr(
	       const void *s,
	       int c,
	       size_t n ); int memcmp(
	       const void *s1,
	       const void *s2,
	       size_t n ); int *memcpy(
	       void *s1,
	       const void *s2,
	       size_t n ); int *memmove(
	       void *s1,
	       const void *s2,
	       size_t n ); int *memset(
	       void *s,
	       int c,
	       size_t n );

LIBRARY
       Standard C Library (libc)

STANDARDS
       Interfaces documented on this reference page conform to industry	 stan‐
       dards as follows:

       memchr(),   memcmp(),   memcpy(),  memmove(),  memset():	 ISO C,	 XPG4,
       XPG4-UNIX

       memccpy():  XPG4, XPG4-UNIX

       Refer to the standards(5) reference page	 for  more  information	 about
       industry standards and associated tags.

PARAMETERS
       Points to the location of a string.  Points to the location of a desti‐
       nation string.  Points to the location of a source string.  Specifies a
       character  for  which to search (except for memset(), in which c is the
       target of the copy).  Specifies the number of characters to search.

DESCRIPTION
       The memccpy(), memchr(), memcmp(), memcpy(),  memmove(),	 and  memset()
       functions  operate on strings in memory areas. A memory area is a group
       of contiguous characters bound by a count and not terminated by a  null
       character.  These  memory  functions  do	 not check for overflow of the
       receiving memory area.  All  of	the  functions	are  declared  in  the
       string.h header file.

       The  memccpy()  function	 sequentially  copies  bytes from the location
       pointed to by the s2 parameter into the location pointed to by  the  s1
       parameter until one of the following occurs: The character specified by
       the c parameter, which is converted to an  unsigned  char,  is  copied.
       The  number  of characters specified by the n parameter has been copied
       to the string at location s1.

       The memccpy() function returns a pointer to the character that  follows
       character  c  in	 the  string  pointed  to by s1. If character c is not
       encountered after n characters have been copied to the string at	 loca‐
       tion s1, this function returns a null pointer.

       The  memchr()  function	returns	 a  pointer to the first occurrence of
       character (byte) c in the string pointed to by s. If character c is not
       encountered after n bytes have been copied to the string at location s,
       this function returns a null pointer.

       The memcmp() function compares the first n  characters  (bytes),	 which
       are  converted  to  unsigned  char,  of the string pointed to by the s1
       parameter with the first n characters  (also  interpreted  as  unsigned
       char) of the string pointed to by the s2 parameter.

       The  memcmp()  function returns 0 (zero) or a nonzero value to indicate
       the results of the comparison operation. The sign of a nonzero value is
       determined  by  the  sign  of  the difference between the values of the
       first pair of bytes that differ in the strings being compared. Possible
       return  values  and their meanings follow: When s1 is less than s2 When
       s1 is equal to s2 When s1 is greater than s2

       The memcpy() function copies n bytes from the string pointed to by  the
       s2  parameter  into  the	 location pointed to by the s1 parameter. When
       copying overlapping strings, the behavior of this function  is  unreli‐
       able.

       The  memmove()  function copies n bytes from the string at the location
       pointed to by the s2 parameter to the string at the location pointed to
       by  the	s1  parameter.	Copying	 takes place as though the n number of
       bytes from string s2 were first copied into a temporary location having
       n  bytes that do not overlap either of the strings pointed to by s1 and
       s2.  Then, n number of bytes from the temporary location is  copied  to
       the  string  pointed  to	 by s1. Consequently, this operation is nonde‐
       structive and proceeds from left to right.

       The memset() function copies the value of the byte specified by	the  c
       parameter,  which  is  converted	 to an unsigned char, into each of the
       first n locations of the string pointed to by the s parameter.

RETURN VALUES
       The memccpy() function returns a pointer	 to  the  byte	following  the
       character  (byte) specified by the c parameter in the string pointed to
       by the s1 parameter. If character c is not found after  the  number  of
       bytes  specified by the n parameter are scanned, the function returns a
       null pointer.

       The memchr() function returns a pointer to the character (byte)	speci‐
       fied by the c parameter. If character c does not occur after n bytes in
       the string pointed to by the s  parameter  are  scanned,	 the  function
       returns a null pointer.

       The  memcmp()  function returns a value greater than, equal to, or less
       than 0 (zero), according to whether the string pointed  to  by  the  s1
       parameter  has  a value greater than, equal to, or less than the string
       pointed to by the s2 parameter.

       The memcpy() and memmove() functions return the string  pointed	to  by
       the s1 parameter. No return value is reserved to indicate an error.

       The memset() function returns the string pointed to by the s parameter.

SEE ALSO
       Functions: bcopy(3), string(3), swab(3), wmemcpy(3)

       Standards: standards(5)

								    memccpy(3)
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