92 lines
2.0 KiB
C
92 lines
2.0 KiB
C
/*
|
|
FUNCTION
|
|
<<stpcpy>>---copy string returning a pointer to its end
|
|
|
|
INDEX
|
|
stpcpy
|
|
|
|
ANSI_SYNOPSIS
|
|
#include <string.h>
|
|
char *stpcpy(char *<[dst]>, const char *<[src]>);
|
|
|
|
TRAD_SYNOPSIS
|
|
#include <string.h>
|
|
char *stpcpy(<[dst]>, <[src]>)
|
|
char *<[dst]>;
|
|
char *<[src]>;
|
|
|
|
DESCRIPTION
|
|
<<stpcpy>> copies the string pointed to by <[src]>
|
|
(including the terminating null character) to the array
|
|
pointed to by <[dst]>.
|
|
|
|
RETURNS
|
|
This function returns a pointer to the end of the destination string,
|
|
thus pointing to the trailing '\0'.
|
|
|
|
PORTABILITY
|
|
<<stpcpy>> is a GNU extension, candidate for inclusion into POSIX/SUSv4.
|
|
|
|
<<stpcpy>> requires no supporting OS subroutines.
|
|
|
|
QUICKREF
|
|
stpcpy gnu
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include <limits.h>
|
|
|
|
/*SUPPRESS 560*/
|
|
/*SUPPRESS 530*/
|
|
|
|
/* Nonzero if either X or Y is not aligned on a "long" boundary. */
|
|
#define UNALIGNED(X, Y) \
|
|
(((long)X & (sizeof (long) - 1)) | ((long)Y & (sizeof (long) - 1)))
|
|
|
|
#if LONG_MAX == 2147483647L
|
|
#define DETECTNULL(X) (((X) - 0x01010101) & ~(X) & 0x80808080)
|
|
#else
|
|
#if LONG_MAX == 9223372036854775807L
|
|
/* Nonzero if X (a long int) contains a NULL byte. */
|
|
#define DETECTNULL(X) (((X) - 0x0101010101010101) & ~(X) & 0x8080808080808080)
|
|
#else
|
|
#error long int is not a 32bit or 64bit type.
|
|
#endif
|
|
#endif
|
|
|
|
#ifndef DETECTNULL
|
|
#error long int is not a 32bit or 64bit byte
|
|
#endif
|
|
|
|
char*
|
|
_DEFUN (stpcpy, (dst, src),
|
|
char *dst _AND
|
|
_CONST char *src)
|
|
{
|
|
#if !defined(PREFER_SIZE_OVER_SPEED) && !defined(__OPTIMIZE_SIZE__)
|
|
long *aligned_dst;
|
|
_CONST long *aligned_src;
|
|
|
|
/* If SRC or DEST is unaligned, then copy bytes. */
|
|
if (!UNALIGNED (src, dst))
|
|
{
|
|
aligned_dst = (long*)dst;
|
|
aligned_src = (long*)src;
|
|
|
|
/* SRC and DEST are both "long int" aligned, try to do "long int"
|
|
sized copies. */
|
|
while (!DETECTNULL(*aligned_src))
|
|
{
|
|
*aligned_dst++ = *aligned_src++;
|
|
}
|
|
|
|
dst = (char*)aligned_dst;
|
|
src = (char*)aligned_src;
|
|
}
|
|
#endif /* not PREFER_SIZE_OVER_SPEED */
|
|
|
|
while ((*dst++ = *src++))
|
|
;
|
|
return --dst;
|
|
}
|