WebSVN – HelenOS – Diff – /branches/dynload/uspace/lib/libc/generic/string.c



 * @param str    Output buffer.
 * @param offset Byte offset where to start writing.
 * @param size   Size of the output buffer (in bytes).
 *
 * @return EOK if the character was encoded successfully, EOVERFLOW if there
 *         was not enough space in the output buffer or EINVAL if the character
 *         code was invalid.
 */
int chr_encode(const wchar_t ch, char *str, size_t *offset, size_t size)
{
    if (*offset >= size)
        return EOVERFLOW;

 * @param max_len Maximum number of characters to measure.
 *
 * @return Number of bytes used by the characters.
 *
 */
size_t str_lsize(const char *str, size_t max_len)
{
    size_t len = 0;
    size_t offset = 0;
   
    while (len < max_len) {
        if (str_decode(str, &offset, STR_NO_LIMIT) == 0)
            break;

 * @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, size_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.
 *
 */
size_t str_length(const char *str)
{
    size_t len = 0;
    size_t offset = 0;
   
    while (str_decode(str, &offset, STR_NO_LIMIT) != 0)
        len++;
   

 * @param str NULL-terminated wide string.
 *
 * @return Number of characters in @a str.
 *
 */
size_t wstr_length(const wchar_t *wstr)
{
    size_t len = 0;
   
    while (*wstr++ != 0)
        len++;
   
    return len;

 * @param size Maximum number of bytes to consider.
 *
 * @return Number of characters in string.
 *
 */
size_t str_nlength(const char *str, size_t size)
{
    size_t len = 0;
    size_t offset = 0;
   
    while (str_decode(str, &offset, size) != 0)
        len++;
   

 * @param size Maximum number of bytes to consider.
 *
 * @return Number of characters in string.
 *
 */
size_t wstr_nlength(const wchar_t *str, size_t size)
{
    size_t len = 0;
    size_t limit = ALIGN_DOWN(size, sizeof(wchar_t));
    size_t offset = 0;
   
    while ((offset < limit) && (*str++ != 0)) {
        len++;
        offset += sizeof(wchar_t);
    }

 *
 * @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, size_t max_len)
{
    wchar_t c1 = 0;
    wchar_t c2 = 0;
   
    size_t off1 = 0;
    size_t off2 = 0;
   
    size_t len = 0;
 
    while (true) {
        if (len >= max_len)
            break;
 

    /* No space for the NULL-terminator in the buffer */
    if (size == 0)
        return;
   
    wchar_t ch;
    size_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;

 * @param str String to search.
 * @param ch  Character to look for.
 *
 * @return Pointer to character in @a str or NULL if not found.
 */
char *str_chr(const char *str, wchar_t ch)
{
    wchar_t acc;
    size_t off = 0;
    size_t last = 0;
   
    while ((acc = str_decode(str, &off, STR_NO_LIMIT)) != 0) {
        if (acc == ch)
            return (char *) (str + last);
        last = off;
    }
   
    return NULL;
}

 * @param str String to search.
 * @param ch  Character to look for.
 *
 * @return Pointer to character in @a str or NULL if not found.
 */
char *str_rchr(const char *str, wchar_t ch)
{
    wchar_t acc;
    size_t off = 0;
    size_t last = 0;
    const char *res = NULL;
   
    while ((acc = str_decode(str, &off, STR_NO_LIMIT)) != 0) {
        if (acc == ch)
            res = (str + last);
        last = off;
    }
   
    return (char *) res;
}
 
/** Insert a wide character into a wide string.
 *
 * Insert a wide character into a wide string at position

 *
 * @return True if the insertion was sucessful, false if the position
 *         is out of bounds.
 *
 */
bool wstr_linsert(wchar_t *str, wchar_t ch, size_t pos, size_t max_pos)
{
    size_t len = wstr_length(str);
   
    if ((pos > len) || (pos + 1 > max_pos))
        return false;
   
    size_t i;
    for (i = len; i + 1 > pos; i--)
        str[i + 1] = str[i];
   
    str[pos] = ch;
   

 *
 * @return True if the removal was sucessful, false if the position
 *         is out of bounds.
 *
 */
bool wstr_remove(wchar_t *str, size_t pos)
{
    size_t len = wstr_length(str);
   
    if (pos >= len)
        return false;
   
    size_t i;
    for (i = pos + 1; i <= len; i++)
        str[i - 1] = str[i];
   
    return true;
}

Rev 4348	Rev 4691
Line 136...	Line 136...
136	* @param str Output buffer.	136	* @param str Output buffer.
137	* @param offset Byte offset where to start writing.	137	* @param offset Byte offset where to start writing.
138	* @param size Size of the output buffer (in bytes).	138	* @param size Size of the output buffer (in bytes).
139	*	139	*
140	* @return EOK if the character was encoded successfully, EOVERFLOW if there	140	* @return EOK if the character was encoded successfully, EOVERFLOW if there
141	* was not enough space in the output buffer or EINVAL if the character	141	* was not enough space in the output buffer or EINVAL if the character
142	* code was invalid.	142	* code was invalid.
143	*/	143	*/
144	int chr_encode(const wchar_t ch, char str, size_t offset, size_t size)	144	int chr_encode(const wchar_t ch, char str, size_t offset, size_t size)
145	{	145	{
146	if (*offset >= size)	146	if (*offset >= size)
147	return EOVERFLOW;	147	return EOVERFLOW;
Line 241...	Line 241...
241	* @param max_len Maximum number of characters to measure.	241	* @param max_len Maximum number of characters to measure.
242	*	242	*
243	* @return Number of bytes used by the characters.	243	* @return Number of bytes used by the characters.
244	*	244	*
245	*/	245	*/
246	size_t str_lsize(const char *str, count_t max_len)	246	size_t str_lsize(const char *str, size_t max_len)
247	{	247	{
248	count_t len = 0;	248	size_t len = 0;
249	size_t offset = 0;	249	size_t offset = 0;
250		250
251	while (len < max_len) {	251	while (len < max_len) {
252	if (str_decode(str, &offset, STR_NO_LIMIT) == 0)	252	if (str_decode(str, &offset, STR_NO_LIMIT) == 0)
253	break;	253	break;
Line 269...	Line 269...
269	* @param max_len Maximum number of wide characters to measure.	269	* @param max_len Maximum number of wide characters to measure.
270	*	270	*
271	* @return Number of bytes used by the wide characters.	271	* @return Number of bytes used by the wide characters.
272	*	272	*
273	*/	273	*/
274	size_t wstr_lsize(const wchar_t *str, count_t max_len)	274	size_t wstr_lsize(const wchar_t *str, size_t max_len)
275	{	275	{
276	return (wstr_nlength(str, max_len * sizeof(wchar_t)) * sizeof(wchar_t));	276	return (wstr_nlength(str, max_len * sizeof(wchar_t)) * sizeof(wchar_t));
277	}	277	}
278		278
279	/** Get number of characters in a string.	279	/** Get number of characters in a string.
Line 281...	Line 281...
281	* @param str NULL-terminated string.	281	* @param str NULL-terminated string.
282	*	282	*
283	* @return Number of characters in string.	283	* @return Number of characters in string.
284	*	284	*
285	*/	285	*/
286	count_t str_length(const char *str)	286	size_t str_length(const char *str)
287	{	287	{
288	count_t len = 0;	288	size_t len = 0;
289	size_t offset = 0;	289	size_t offset = 0;
290		290
291	while (str_decode(str, &offset, STR_NO_LIMIT) != 0)	291	while (str_decode(str, &offset, STR_NO_LIMIT) != 0)
292	len++;	292	len++;
293		293
Line 299...	Line 299...
299	* @param str NULL-terminated wide string.	299	* @param str NULL-terminated wide string.
300	*	300	*
301	* @return Number of characters in @a str.	301	* @return Number of characters in @a str.
302	*	302	*
303	*/	303	*/
304	count_t wstr_length(const wchar_t *wstr)	304	size_t wstr_length(const wchar_t *wstr)
305	{	305	{
306	count_t len = 0;	306	size_t len = 0;
307		307
308	while (*wstr++ != 0)	308	while (*wstr++ != 0)
309	len++;	309	len++;
310		310
311	return len;	311	return len;
Line 317...	Line 317...
317	* @param size Maximum number of bytes to consider.	317	* @param size Maximum number of bytes to consider.
318	*	318	*
319	* @return Number of characters in string.	319	* @return Number of characters in string.
320	*	320	*
321	*/	321	*/
322	count_t str_nlength(const char *str, size_t size)	322	size_t str_nlength(const char *str, size_t size)
323	{	323	{
324	count_t len = 0;	324	size_t len = 0;
325	size_t offset = 0;	325	size_t offset = 0;
326		326
327	while (str_decode(str, &offset, size) != 0)	327	while (str_decode(str, &offset, size) != 0)
328	len++;	328	len++;
329		329
Line 336...	Line 336...
336	* @param size Maximum number of bytes to consider.	336	* @param size Maximum number of bytes to consider.
337	*	337	*
338	* @return Number of characters in string.	338	* @return Number of characters in string.
339	*	339	*
340	*/	340	*/
341	count_t wstr_nlength(const wchar_t *str, size_t size)	341	size_t wstr_nlength(const wchar_t *str, size_t size)
342	{	342	{
343	count_t len = 0;	343	size_t len = 0;
344	count_t limit = ALIGN_DOWN(size, sizeof(wchar_t));	344	size_t limit = ALIGN_DOWN(size, sizeof(wchar_t));
345	count_t offset = 0;	345	size_t offset = 0;
346		346
347	while ((offset < limit) && (*str++ != 0)) {	347	while ((offset < limit) && (*str++ != 0)) {
348	len++;	348	len++;
349	offset += sizeof(wchar_t);	349	offset += sizeof(wchar_t);
350	}	350	}
Line 428...	Line 428...
428	*	428	*
429	* @return 0 if the strings are equal, -1 if first is smaller,	429	* @return 0 if the strings are equal, -1 if first is smaller,
430	* 1 if second smaller.	430	* 1 if second smaller.
431	*	431	*
432	*/	432	*/
433	int str_lcmp(const char s1, const char s2, count_t max_len)	433	int str_lcmp(const char s1, const char s2, size_t max_len)
434	{	434	{
435	wchar_t c1 = 0;	435	wchar_t c1 = 0;
436	wchar_t c2 = 0;	436	wchar_t c2 = 0;
437		437
438	size_t off1 = 0;	438	size_t off1 = 0;
439	size_t off2 = 0;	439	size_t off2 = 0;
440		440
441	count_t len = 0;	441	size_t len = 0;
442		442
443	while (true) {	443	while (true) {
444	if (len >= max_len)	444	if (len >= max_len)
445	break;	445	break;
446		446
Line 566...	Line 566...
566	/* No space for the NULL-terminator in the buffer */	566	/* No space for the NULL-terminator in the buffer */
567	if (size == 0)	567	if (size == 0)
568	return;	568	return;
569		569
570	wchar_t ch;	570	wchar_t ch;
571	count_t src_idx = 0;	571	size_t src_idx = 0;
572	size_t dst_off = 0;	572	size_t dst_off = 0;
573		573
574	while ((ch = src[src_idx++]) != 0) {	574	while ((ch = src[src_idx++]) != 0) {
575	if (chr_encode(ch, dst, &dst_off, size) != EOK)	575	if (chr_encode(ch, dst, &dst_off, size) != EOK)
576	break;	576	break;
Line 587...	Line 587...
587	* @param str String to search.	587	* @param str String to search.
588	* @param ch Character to look for.	588	* @param ch Character to look for.
589	*	589	*
590	* @return Pointer to character in @a str or NULL if not found.	590	* @return Pointer to character in @a str or NULL if not found.
591	*/	591	*/
592	const char str_chr(const char str, wchar_t ch)	592	char str_chr(const char str, wchar_t ch)
593	{	593	{
594	wchar_t acc;	594	wchar_t acc;
595	size_t off = 0;	595	size_t off = 0;
596	size_t last = 0;	596	size_t last = 0;
597		597
598	while ((acc = str_decode(str, &off, STR_NO_LIMIT)) != 0) {	598	while ((acc = str_decode(str, &off, STR_NO_LIMIT)) != 0) {
599	if (acc == ch)	599	if (acc == ch)
600	return (str + last);	600	return (char *) (str + last);
601	last = off;	601	last = off;
602	}	602	}
603		603
604	return NULL;	604	return NULL;
605	}	605	}
Line 609...	Line 609...
609	* @param str String to search.	609	* @param str String to search.
610	* @param ch Character to look for.	610	* @param ch Character to look for.
611	*	611	*
612	* @return Pointer to character in @a str or NULL if not found.	612	* @return Pointer to character in @a str or NULL if not found.
613	*/	613	*/
614	const char str_rchr(const char str, wchar_t ch)	614	char str_rchr(const char str, wchar_t ch)
615	{	615	{
616	wchar_t acc;	616	wchar_t acc;
617	size_t off = 0;	617	size_t off = 0;
618	size_t last = 0;	618	size_t last = 0;
619	char *res = NULL;	619	const char *res = NULL;
620		620
621	while ((acc = str_decode(str, &off, STR_NO_LIMIT)) != 0) {	621	while ((acc = str_decode(str, &off, STR_NO_LIMIT)) != 0) {
622	if (acc == ch)	622	if (acc == ch)
623	res = (str + last);	623	res = (str + last);
624	last = off;	624	last = off;
625	}	625	}
626		626
627	return res;	627	return (char *) res;
628	}	628	}
629		629
630	/** Insert a wide character into a wide string.	630	/** Insert a wide character into a wide string.
631	*	631	*
632	* Insert a wide character into a wide string at position	632	* Insert a wide character into a wide string at position
Line 639...	Line 639...
639	*	639	*
640	* @return True if the insertion was sucessful, false if the position	640	* @return True if the insertion was sucessful, false if the position
641	* is out of bounds.	641	* is out of bounds.
642	*	642	*
643	*/	643	*/
644	bool wstr_linsert(wchar_t *str, wchar_t ch, count_t pos, count_t max_pos)	644	bool wstr_linsert(wchar_t *str, wchar_t ch, size_t pos, size_t max_pos)
645	{	645	{
646	count_t len = wstr_length(str);	646	size_t len = wstr_length(str);
647		647
648	if ((pos > len) \|\| (pos + 1 > max_pos))	648	if ((pos > len) \|\| (pos + 1 > max_pos))
649	return false;	649	return false;
650		650
651	count_t i;	651	size_t i;
652	for (i = len; i + 1 > pos; i--)	652	for (i = len; i + 1 > pos; i--)
653	str[i + 1] = str[i];	653	str[i + 1] = str[i];
654		654
655	str[pos] = ch;	655	str[pos] = ch;
656		656
Line 667...	Line 667...
667	*	667	*
668	* @return True if the removal was sucessful, false if the position	668	* @return True if the removal was sucessful, false if the position
669	* is out of bounds.	669	* is out of bounds.
670	*	670	*
671	*/	671	*/
672	bool wstr_remove(wchar_t *str, count_t pos)	672	bool wstr_remove(wchar_t *str, size_t pos)
673	{	673	{
674	count_t len = wstr_length(str);	674	size_t len = wstr_length(str);
675		675
676	if (pos >= len)	676	if (pos >= len)
677	return false;	677	return false;
678		678
679	count_t i;	679	size_t i;
680	for (i = pos + 1; i <= len; i++)	680	for (i = pos + 1; i <= len; i++)
681	str[i - 1] = str[i];	681	str[i - 1] = str[i];
682		682
683	return true;	683	return true;
684	}	684	}

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(root)/branches/dynload/uspace/lib/libc/generic/string.c @ 3769 – Rev 4348 → 4691