Subversion Repositories HelenOS

#include <align.h>

/** Get size of string.

 *

 * Get the number of bytes which are used by the string @a str (excluding the

 * NULL-terminator).

 *

 * @param str String to consider.

 *

 * @return Number of bytes used by the string

 *

 */

size_t str_size(const char *str)

{

    size_t size = 0;

    while (*str++ != 0)

        size++;

    return size;

}

/** Get size of wide string.

 *

 * Get the number of bytes which are used by the wide string @a str (excluding the

 * NULL-terminator).

 *

 * @param str Wide string to consider.

 *

 * @return Number of bytes used by the wide string

 *

 */

size_t wstr_size(const wchar_t *str)

{

    return (wstr_length(str) * sizeof(wchar_t));

}

/** Get size of string with length limit.

 *

 * Get the number of bytes which are used by up to @a max_len first

 * characters in the string @a str. If @a max_len is greater than

 * the length of @a str, the entire string is measured (excluding the

 * NULL-terminator).

 *

 * @param str     String to consider.

 * @param max_len Maximum number of characters to measure.

 *

 * @return Number of bytes used by the characters.

 *

 */

size_t str_lsize(const char *str, count_t max_len)

{

    count_t len = 0;

    size_t offset = 0;

    while (len < max_len) {

        if (str_decode(str, &offset, STR_NO_LIMIT) == 0)

            break;

        len++;

    }

    return offset;

}

/** Get size of wide string with length limit.

 *

 * Get the number of bytes which are used by up to @a max_len first

 * wide characters in the wide string @a str. If @a max_len is greater than

 * the length of @a str, the entire wide string is measured (excluding the

 * NULL-terminator).

 *

 * @param str     Wide string to consider.

 * @param max_len Maximum number of wide characters to measure.

 *

 * @return Number of bytes used by the wide characters.

 *

 */

size_t wstr_lsize(const wchar_t *str, count_t max_len)

{

    return (wstr_nlength(str, max_len * sizeof(wchar_t)) * sizeof(wchar_t));

}

/** Get number of characters in a string.

 *

 * @param str NULL-terminated string.

 *

 * @return Number of characters in string.

 *

 */

count_t str_length(const char *str)

{

    count_t len = 0;

    size_t offset = 0;

    while (str_decode(str, &offset, STR_NO_LIMIT) != 0)

        len++;

    return len;

}

/** Get number of characters in a wide string.

 *

 * @param str NULL-terminated wide string.

 *

 * @return Number of characters in @a str.

 *

 */

count_t wstr_length(const wchar_t *wstr)

{

    count_t len = 0;

    while (*wstr++ != 0)

        len++;

    return len;

}

/** Get number of characters in a string with size limit.

 *

 * @param str  NULL-terminated string.

 * @param size Maximum number of bytes to consider.

 *

 * @return Number of characters in string.

 *

 */

count_t str_nlength(const char *str, size_t size)

{

    count_t len = 0;

    size_t offset = 0;

    while (str_decode(str, &offset, size) != 0)

        len++;

    return len;

}

/** Get number of characters in a string with size limit.

 *

 * @param str  NULL-terminated string.

 * @param size Maximum number of bytes to consider.

 *

 * @return Number of characters in string.

 *

 */

count_t wstr_nlength(const wchar_t *str, size_t size)

{

    count_t len = 0;

    count_t limit = ALIGN_DOWN(size, sizeof(wchar_t));

    count_t offset = 0;

    while ((offset < limit) && (*str++ != 0)) {

        len++;

        offset += sizeof(wchar_t);

    }

    return len;

}

/** Check whether character is plain ASCII.

 *

 * @return True if character is plain ASCII.

 *

 */

bool ascii_check(wchar_t ch)

{

    if ((ch >= 0) && (ch <= 127))

        return true;

    return false;

}

/** Compare two NULL terminated strings.

 *

 * Do a char-by-char comparison of two NULL-terminated strings.

 * The strings are considered equal iff they consist of the same

 * characters on the minimum of their lengths.

 *

 * @param s1 First string to compare.

 * @param s2 Second string to compare.

 *

 * @return 0 if the strings are equal, -1 if first is smaller,

 *         1 if second smaller.

 *

 */

int str_cmp(const char *s1, const char *s2)

{

    wchar_t c1 = 0;

    wchar_t c2 = 0;

    size_t off1 = 0;

    size_t off2 = 0;

    while (true) {

        c1 = str_decode(s1, &off1, STR_NO_LIMIT);

        c2 = str_decode(s2, &off2, STR_NO_LIMIT);

        if (c1 < c2)

            return -1;

        if (c1 > c2)

            return 1;

        if (c1 == 0 || c2 == 0)

            break;     

    }

    return 0;

}

/** Compare two NULL terminated strings with length limit.

 *

 * Do a char-by-char comparison of two NULL-terminated strings.

 * The strings are considered equal iff they consist of the same

 * characters on the minimum of their lengths and the length limit.

 *

 * @param s1      First string to compare.

 * @param s2      Second string to compare.

 * @param max_len Maximum number of characters to consider.

 *

 * @return 0 if the strings are equal, -1 if first is smaller,

 *         1 if second smaller.

 *

 */

int str_lcmp(const char *s1, const char *s2, count_t max_len)

{

    wchar_t c1 = 0;

    wchar_t c2 = 0;

    size_t off1 = 0;

    size_t off2 = 0;

    count_t len = 0;

    while (true) {

        if (len >= max_len)

            break;

        c1 = str_decode(s1, &off1, STR_NO_LIMIT);

        c2 = str_decode(s2, &off2, STR_NO_LIMIT);

        if (c1 < c2)

            return -1;

        if (c1 > c2)

            return 1;

        if (c1 == 0 || c2 == 0)

            break;

        ++len; 

    }

    return 0;

}

/** Copy NULL-terminated string.

 *

 * Copy source string @a src to destination buffer @a dst.

 * No more than @a size bytes are written. NULL-terminator is always

 * written after the last succesfully copied character (i.e. if the

 * destination buffer is has at least 1 byte, it will be always

 * NULL-terminated).

 *

 * @param src   Source string.

 * @param dst   Destination buffer.

 * @param count Size of the destination buffer.

 *

 */

void str_ncpy(char *dst, const char *src, size_t size)

{

    /* No space for the NULL-terminator in the buffer */

    if (size == 0)

        return;

    wchar_t ch;

    size_t str_off = 0;

    size_t dst_off = 0;

    while ((ch = str_decode(src, &str_off, STR_NO_LIMIT)) != 0) {

        if (chr_encode(ch, dst, &dst_off, size) != EOK)

            break;

    }

    if (dst_off >= size)

        dst[size - 1] = 0;

    else

        dst[dst_off] = 0;

}

/** Copy NULL-terminated wide string to string

 *

 * Copy source wide string @a src to destination buffer @a dst.

 * No more than @a size bytes are written. NULL-terminator is always

 * written after the last succesfully copied character (i.e. if the

 * destination buffer is has at least 1 byte, it will be always

 * NULL-terminated).

 *

 * @param src   Source wide string.

 * @param dst   Destination buffer.

 * @param count Size of the destination buffer.

 *

 */

void wstr_nstr(char *dst, const wchar_t *src, size_t size)

{

    /* No space for the NULL-terminator in the buffer */

    if (size == 0)

        return;

    wchar_t ch;

    count_t src_idx = 0;

    size_t dst_off = 0;

    while ((ch = src[src_idx++]) != 0) {

        if (chr_encode(ch, dst, &dst_off, size) != EOK)

            break;

    }

    if (dst_off >= size)

        dst[size - 1] = 0;

    else

        dst[dst_off] = 0;

}

/** Find first occurence of character in string.

 *

 * @param str String to search.

 * @param ch  Character to look for.

 *

 * @return Pointer to character in @a str or NULL if not found.

 *

 */

const char *str_chr(const char *str, wchar_t ch)

{

    wchar_t acc;

    size_t off = 0;

    while ((acc = str_decode(str, &off, STR_NO_LIMIT)) != 0) {

        if (acc == ch)

            return (str + off);

    }

    return NULL;

}

/** Insert a wide character into a wide string.

 *

 * Insert a wide character into a wide string at position

 * @a pos. The characters after the position are shifted.

 *

 * @param str     String to insert to.

 * @param ch      Character to insert to.

 * @param pos     Character index where to insert.

 @ @param max_pos Characters in the buffer.

 *

 * @return True if the insertion was sucessful, false if the position

 *         is out of bounds.

 *

 */

bool wstr_linsert(wchar_t *str, wchar_t ch, count_t pos, count_t max_pos)

{

    count_t len = wstr_length(str);

    if ((pos > len) || (pos + 1 > max_pos))

        return false;

    count_t i;

    for (i = len; i + 1 > pos; i--)

        str[i + 1] = str[i];

    str[pos] = ch;

    return true;

}

/** Remove a wide character from a wide string.

 *

 * Remove a wide character from a wide string at position

 * @a pos. The characters after the position are shifted.

 *

 * @param str String to remove from.

 * @param pos Character index to remove.

 *

 * @return True if the removal was sucessful, false if the position

 *         is out of bounds.

 *

 */

bool wstr_remove(wchar_t *str, count_t pos)

{

    count_t len = wstr_length(str);

    if (pos >= len)

        return false;

    count_t i;

    for (i = pos + 1; i <= len; i++)

        str[i - 1] = str[i];

    return true;

}