diff options
author | Corinna Vinschen <corinna@vinschen.de> | 2007-06-28 21:07:23 +0400 |
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committer | Corinna Vinschen <corinna@vinschen.de> | 2007-06-28 21:07:23 +0400 |
commit | 5d8b97a6942169497ba891acf86725ec87afa60b (patch) | |
tree | b802738264b2f57d3088579c0d9ffae9a7a09633 /newlib/libc/string/stpcpy.c | |
parent | a4b5a24055334025e399b3d1b06985a39beeaa84 (diff) |
* libc/include/string.h: Add prototypes for stpcpy and stpncpy.
* libc/string/Makefile.am (ELIX_SOURCES): Add stpcpy.c and
stpncpy.c.
(CHEWOUT_FILES): Add stpcpy.def and stpncpy.def.
* libc/string/Makefile.in: Regenerate.
* libc/string/stpcpy.c: New file.
* libc/string/stpncpy.c: New file.
* libc/string/strings.tex: Add stpcpy and stpncpy.
Diffstat (limited to 'newlib/libc/string/stpcpy.c')
-rw-r--r-- | newlib/libc/string/stpcpy.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/newlib/libc/string/stpcpy.c b/newlib/libc/string/stpcpy.c new file mode 100644 index 000000000..62fe79997 --- /dev/null +++ b/newlib/libc/string/stpcpy.c @@ -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]>); + +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; +} |