linux/lib/string.c

/**
 * strlen - Find the length of a string
 * @s: The string to be sized
 */
size_t strlen(const char *s)
{
    const char *sc;

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

/**
 * strnlen - Find the length of a length-limited string
 * @s: The string to be sized
 * @count: The maximum number of bytes to search
 */
size_t strnlen(const char *s, size_t count)
{
    const char *sc;

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

/**
 * strcpy - Copy a %NUL terminated string
 * @dest: Where to copy the string to
 * @src: Where to copy the string from
 */
char *strcpy(char *dest, const char *src)
{
    char *tmp = dest;

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

/**
 * strncpy - Copy a length-limited, %NUL-terminated string
 * @dest: Where to copy the string to
 * @src: Where to copy the string from
 * @count: The maximum number of bytes to copy
 *
 * The result is not %NUL-terminated if the source exceeds
 * @count bytes.
 *
 * In the case where the length of @src is less than  that  of
 * count, the remainder of @dest will be padded with %NUL.
 *
 */
char *strncpy(char *dest, const char *src, size_t count)
{
    char *tmp = dest;

    while (count) {
        if ((*tmp = *src) != 0) /* src到尽头后不再自加使得dest后面填''了 */
            src++;
        tmp++;
        count--;
    }
    return dest;
}

/**
 * strcat - Append one %NUL-terminated string to another
 * @dest: The string to be appended to
 * @src: The string to append to it
 */
char *strcat(char *dest, const char *src)
{
    char *tmp = dest;

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

/**
 * strncat - Append a length-limited, %NUL-terminated string to another
 * @dest: The string to be appended to
 * @src: The string to append to it
 * @count: The maximum numbers of bytes to copy
 *
 * Note that in contrast to strncpy(), strncat() ensures the result is
 * terminated.
 */
char *strncat(char *dest, const char *src, size_t count)
{
    char *tmp = dest;

    if (count) {
        while (*dest)
            dest++;
        while ((*dest++ = *src++) != 0) {
            if (--count == 0) {
                *dest = '';
                break;
            }
        }
    }
    return tmp;
}

/**
 * strcmp - Compare two strings
 * @cs: One string
 * @ct: Another string
 */
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;
}

/**
 * strncmp - Compare two length-limited strings
 * @cs: One string
 * @ct: Another string
 * @count: The maximum number of bytes to compare
 */
int strncmp(const char *cs, const char *ct, size_t count)
{
    unsigned char c1, c2;

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

/**
 * strchr - Find the first occurrence of a character in a string
 * @s: The string to be searched
 * @c: The character to search for
 */
char *strchr(const char *s, int c)
{
    for (; *s != (char)c; ++s)
        if (*s == '')
            return NULL;
    return (char *)s;
}

/**
 * strnchr - Find a character in a length limited string
 * @s: The string to be searched
 * @count: The number of characters to be searched
 * @c: The character to search for
 */
char *strnchr(const char *s, size_t count, int c)
{
    for (; count-- && *s != ''; ++s)
        if (*s == (char)c)
            return (char *)s;
    return NULL;
}

/**
 * memcmp - Compare two areas of memory
 * @cs: One area of memory
 * @ct: Another area of memory
 * @count: The size of the area.
 */
int memcmp(const void *cs, const void *ct, size_t count)
{
    const unsigned char *su1, *su2;
    int res = 0;

    for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
        if ((res = *su1 - *su2) != 0)
            break;
    return res;
}

/**
 * memcpy - Copy one area of memory to another
 * @dest: Where to copy to
 * @src: Where to copy from
 * @count: The size of the area.
 *
 * You should not use this function to access IO space, use memcpy_toio()
 * or memcpy_fromio() instead.
 */
void *memcpy(void *dest, const void *src, size_t count)
{
    char *tmp = dest;
    const char *s = src;

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

/* Not static to avoid a conflict with the prototype in the Linux headers. */
void *memmove(void *dest, const void *src, size_t size)
{
    uint8_t *d = dest;
    const uint8_t *s = src;
    size_t i;
    /* 判断地址高低, 可出现重叠区域 */
    if (d < s) {
        for (i = 0; i < size; ++i)
            d[i] = s[i];
    } else if (d > s) {
        i = size;
        while (i-- > 0)
            d[i] = s[i];
    }

    return dest;
}

/**
 * strstr - Find the first substring in a %NUL terminated string
 * @s1: The string to be searched
 * @s2: The string to search for
 */
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;
}

/**
 * strnstr - Find the first substring in a length-limited string
 * @s1: The string to be searched
 * @s2: The string to search for
 * @len: the maximum number of characters to search
 */
char *strnstr(const char *s1, const char *s2, size_t len)
{
    size_t l2;

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