0,0 → 1,91 |
/* |
FUNCTION |
<<stpcpy>>---copy string returning a pointer to its end |
|
INDEX |
stpcpy |
|
ANSI_SYNOPSIS |
#include <string.h> |
char *stpcpy(char *<[dst]>, const char *<[src]>); |
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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. |
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<<stpcpy>> requires no supporting OS subroutines. |
|
QUICKREF |
stpcpy gnu |
*/ |
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#include <string.h> |
#include <limits.h> |
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/*SUPPRESS 560*/ |
/*SUPPRESS 530*/ |
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/* 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; |
} |