memchr man page on Ultrix

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memory(3)							     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 charac‐
       ters 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 charac‐
       ters 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  implementa‐
       tions of and Thus overlapping moves, using these subroutines, may yield
       unpredictable results.

								     memory(3)
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