int strcmp (const char *s1, const char *s2) {
#ifdef WANT_SMALL_STRING_ROUTINES
    while (*s1 && *s1 == *s2)
        s1++, s2++;
    return (*s1 - *s2);
#else
    const unsigned long *lx1, *lx2;
    unsigned long   l1, l2;
    int             tmp;

    if (UNALIGNED(s1, s2)) {
        while (*s1 && *s1 == *s2) s1++, s2++;
        return (*s1 - *s2);
    }

    if ((tmp = STRALIGN(s1)))
        for (; tmp--; s1++, s2++)
            if (!*s1 || *s1 != *s2)
                return (*s1 - *s2);

    lx1 = (unsigned long *) s1;
    lx2 = (unsigned long *) s2;

    while (1) {
        l1 = *lx1++;
        l2 = *lx2++;
        if ((((l1 - MKW(0x1ul)) & ~l1) & MKW(0x80ul)) ||
            ((((l2 - MKW(0x1ul)) & ~l2) & MKW(0x80ul))) || l1 != l2) {
            unsigned char c1, c2;
            while (1) {
		c1 = GFC(l1);
                c2 = GFC(l2);
                if (!c1 || c1 != c2)
                    return (c1 - c2);
                INCSTR(l1);
                INCSTR(l2);
            }
        }
    }
#endif
}
示例#2
0
文件: strcpy.c 项目: ensc/dietlibc
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)
#ifdef WANT_VALGRIND_SUPPORT
            || __unlikely(__valgrind)
#endif
       ) {
        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
}