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[/] [openrisc/] [tags/] [gnu-src/] [newlib-1.18.0/] [newlib-1.18.0-or32-1.0rc1/] [newlib/] [libc/] [string/] [strcpy.c] - Rev 207
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/* FUNCTION <<strcpy>>---copy string INDEX strcpy ANSI_SYNOPSIS #include <string.h> char *strcpy(char *<[dst]>, const char *<[src]>); TRAD_SYNOPSIS #include <string.h> char *strcpy(<[dst]>, <[src]>) char *<[dst]>; char *<[src]>; DESCRIPTION <<strcpy>> copies the string pointed to by <[src]> (including the terminating null character) to the array pointed to by <[dst]>. RETURNS This function returns the initial value of <[dst]>. PORTABILITY <<strcpy>> is ANSI C. <<strcpy>> requires no supporting OS subroutines. QUICKREF strcpy ansi pure */ #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 (strcpy, (dst0, src0), char *dst0 _AND _CONST char *src0) { #if defined(PREFER_SIZE_OVER_SPEED) || defined(__OPTIMIZE_SIZE__) char *s = dst0; while (*dst0++ = *src0++) ; return s; #else char *dst = dst0; _CONST char *src = src0; 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; } while ((*dst++ = *src++)) ; return dst0; #endif /* not PREFER_SIZE_OVER_SPEED */ }
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