字符串操作函数总结

(1)strcpy:

char *strcpy(char *dest, const char *src)
{
        char *tmp = dest;

        while ((*dest++ = *src++) != '\0')
                /* nothing */;
        return tmp;
}

(2)strcat:

char *strcat(char *dest, const char *src)
{
        char *tmp = dest;

        while (*dest)
                dest++;
        while ((*dest++ = *src++) != '\0')
                ;
        return tmp;
}

(3)strcmp:

int strcmp(const char *cs, const char *ct)
{
        unsigned char c1, c2;

        while (1) {
                c1 = *cs++;
                c2 = *ct++;
                if (c1 != c2)
                        return c1 < c2 ? -1 : 1;
                if (!c1)
                        break;
        }
        return 0;
}

(4)strlen:

size_t strlen(const char *s)
{
        const char *sc;

        for (sc = s; *sc != '\0'; ++sc)
                /* nothing */;
        return sc - s;
}

(5)strstr:

char *strstr(const char *s1, const char *s2)
{
        size_t l1, l2;

        l2 = strlen(s2);
        if (!l2)
                return (char *)s1;
        l1 = strlen(s1);
        while (l1 >= l2) {
                l1--;
                if (!memcmp(s1, s2, l2))
                        return (char *)s1;
                s1++;
        }
        return NULL;
}

(6)memset:

void *memset(void *s, int c, size_t count)
{
        char *xs = s;

        while (count--)
                *xs++ = c;
        return s;
}

(7)memcpy:

void *memcpy(void *dest, const void *src, size_t count)
{
        char *tmp = dest;
        const char *s = src;

        while (count--)
                *tmp++ = *s++;
        return dest;
}