source: trunk/sys/dietlibc/strcpy.c @ 21

/* fast strcpy -- Copyright (C) 2003 Thomas M. Ogrisegg <tom@hi-tek.fnord.at> */
#include <string.h>
#include "dietfeatures.h"
#include "dietstring.h"

char *
strcpy (char *s1, const char *s2)
{
    char           *res = s1;
#ifdef WANT_SMALL_STRING_ROUTINES
    while ((*s1++ = *s2++));
    return (res);
#else
    int             tmp;
    unsigned long   l;

    if (UNALIGNED(s1, s2)) {
        while ((*s1++ = *s2++));
        return (res);
    }
    if ((tmp = STRALIGN(s1))) {
        while (tmp-- && (*s1++ = *s2++));
        if (tmp != -1) return (res);
    }

    while (1) {
        l = *(const unsigned long *) s2;
        if (((l - MKW(0x1ul)) & ~l) & MKW(0x80ul)) {
            while ((*s1++ = GFC(l))) INCSTR(l);
            return (res);
        }
        *(unsigned long *) s1 = l;
        s2 += sizeof(unsigned long);
        s1 += sizeof(unsigned long);
    }
#endif
}