WebSVN – HelenOS – Diff – //branches/dd/kernel/generic/src/lib/string.c



 *
 *  [wide] string size    number of BYTES in a [wide] string (excluding
 *                        the NULL-terminator), size_t
 *
 *  [wide] string length  number of CHARACTERS in a [wide] string (excluding
 *                        the NULL-terminator), size_t
 *
 *  [wide] string width   number of display cells on a monospace display taken
 *                        by a [wide] string, size_t
 *
 *
 * Overview of string metrics:@n
 *
 *  Metric  Abbrev.  Type     Meaning
 *  ------  ------   ------   -------------------------------------------------
 *  size    n        size_t   number of BYTES in a string (excluding the
 *                            NULL-terminator)
 *
 *  length  l        size_t   number of CHARACTERS in a string (excluding the
 *                            null terminator)
 *
 *  width  w         size_t   number of display cells on a monospace display
 *                            taken by a string
 *
 *
 * Function naming prefixes:@n
 *

 *
 * A specific character inside a [wide] string can be referred to by:@n
 *
 *  pointer (char *, wchar_t *)
 *  byte offset (size_t)
 *  character index (size_t)
 *
 */
 
#include <string.h>
#include <print.h>

 * @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;

 *
 * @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 4420	Rev 4537
Line 60...	Line 60...
60	*	60	*
61	* [wide] string size number of BYTES in a [wide] string (excluding	61	* [wide] string size number of BYTES in a [wide] string (excluding
62	* the NULL-terminator), size_t	62	* the NULL-terminator), size_t
63	*	63	*
64	* [wide] string length number of CHARACTERS in a [wide] string (excluding	64	* [wide] string length number of CHARACTERS in a [wide] string (excluding
65	* the NULL-terminator), count_t	65	* the NULL-terminator), size_t
66	*	66	*
67	* [wide] string width number of display cells on a monospace display taken	67	* [wide] string width number of display cells on a monospace display taken
68	* by a [wide] string, count_t	68	* by a [wide] string, size_t
69	*	69	*
70	*	70	*
71	* Overview of string metrics:@n	71	* Overview of string metrics:@n
72	*	72	*
73	* Metric Abbrev. Type Meaning	73	* Metric Abbrev. Type Meaning
74	* ------ ------ ------ -------------------------------------------------	74	* ------ ------ ------ -------------------------------------------------
75	* size n size_t number of BYTES in a string (excluding the	75	* size n size_t number of BYTES in a string (excluding the
76	* NULL-terminator)	76	* NULL-terminator)
77	*	77	*
78	* length l count_t number of CHARACTERS in a string (excluding the	78	* length l size_t number of CHARACTERS in a string (excluding the
79	* null terminator)	79	* null terminator)
80	*	80	*
81	* width w count_t number of display cells on a monospace display	81	* width w size_t number of display cells on a monospace display
82	* taken by a string	82	* taken by a string
83	*	83	*
84	*	84	*
85	* Function naming prefixes:@n	85	* Function naming prefixes:@n
86	*	86	*
Line 95...	Line 95...
95	*	95	*
96	* A specific character inside a [wide] string can be referred to by:@n	96	* A specific character inside a [wide] string can be referred to by:@n
97	*	97	*
98	* pointer (char , wchar_t )	98	* pointer (char , wchar_t )
99	* byte offset (size_t)	99	* byte offset (size_t)
100	* character index (count_t)	100	* character index (size_t)
101	*	101	*
102	*/	102	*/
103		103
104	#include <string.h>	104	#include <string.h>
105	#include <print.h>	105	#include <print.h>
Line 307...	Line 307...
307	* @param max_len Maximum number of characters to measure.	307	* @param max_len Maximum number of characters to measure.
308	*	308	*
309	* @return Number of bytes used by the characters.	309	* @return Number of bytes used by the characters.
310	*	310	*
311	*/	311	*/
312	size_t str_lsize(const char *str, count_t max_len)	312	size_t str_lsize(const char *str, size_t max_len)
313	{	313	{
314	count_t len = 0;	314	size_t len = 0;
315	size_t offset = 0;	315	size_t offset = 0;
316		316
317	while (len < max_len) {	317	while (len < max_len) {
318	if (str_decode(str, &offset, STR_NO_LIMIT) == 0)	318	if (str_decode(str, &offset, STR_NO_LIMIT) == 0)
319	break;	319	break;
Line 335...	Line 335...
335	* @param max_len Maximum number of wide characters to measure.	335	* @param max_len Maximum number of wide characters to measure.
336	*	336	*
337	* @return Number of bytes used by the wide characters.	337	* @return Number of bytes used by the wide characters.
338	*	338	*
339	*/	339	*/
340	size_t wstr_lsize(const wchar_t *str, count_t max_len)	340	size_t wstr_lsize(const wchar_t *str, size_t max_len)
341	{	341	{
342	return (wstr_nlength(str, max_len * sizeof(wchar_t)) * sizeof(wchar_t));	342	return (wstr_nlength(str, max_len * sizeof(wchar_t)) * sizeof(wchar_t));
343	}	343	}
344		344
345	/** Get number of characters in a string.	345	/** Get number of characters in a string.
Line 347...	Line 347...
347	* @param str NULL-terminated string.	347	* @param str NULL-terminated string.
348	*	348	*
349	* @return Number of characters in string.	349	* @return Number of characters in string.
350	*	350	*
351	*/	351	*/
352	count_t str_length(const char *str)	352	size_t str_length(const char *str)
353	{	353	{
354	count_t len = 0;	354	size_t len = 0;
355	size_t offset = 0;	355	size_t offset = 0;
356		356
357	while (str_decode(str, &offset, STR_NO_LIMIT) != 0)	357	while (str_decode(str, &offset, STR_NO_LIMIT) != 0)
358	len++;	358	len++;
359		359
Line 365...	Line 365...
365	* @param str NULL-terminated wide string.	365	* @param str NULL-terminated wide string.
366	*	366	*
367	* @return Number of characters in @a str.	367	* @return Number of characters in @a str.
368	*	368	*
369	*/	369	*/
370	count_t wstr_length(const wchar_t *wstr)	370	size_t wstr_length(const wchar_t *wstr)
371	{	371	{
372	count_t len = 0;	372	size_t len = 0;
373		373
374	while (*wstr++ != 0)	374	while (*wstr++ != 0)
375	len++;	375	len++;
376		376
377	return len;	377	return len;
Line 383...	Line 383...
383	* @param size Maximum number of bytes to consider.	383	* @param size Maximum number of bytes to consider.
384	*	384	*
385	* @return Number of characters in string.	385	* @return Number of characters in string.
386	*	386	*
387	*/	387	*/
388	count_t str_nlength(const char *str, size_t size)	388	size_t str_nlength(const char *str, size_t size)
389	{	389	{
390	count_t len = 0;	390	size_t len = 0;
391	size_t offset = 0;	391	size_t offset = 0;
392		392
393	while (str_decode(str, &offset, size) != 0)	393	while (str_decode(str, &offset, size) != 0)
394	len++;	394	len++;
395		395
Line 402...	Line 402...
402	* @param size Maximum number of bytes to consider.	402	* @param size Maximum number of bytes to consider.
403	*	403	*
404	* @return Number of characters in string.	404	* @return Number of characters in string.
405	*	405	*
406	*/	406	*/
407	count_t wstr_nlength(const wchar_t *str, size_t size)	407	size_t wstr_nlength(const wchar_t *str, size_t size)
408	{	408	{
409	count_t len = 0;	409	size_t len = 0;
410	count_t limit = ALIGN_DOWN(size, sizeof(wchar_t));	410	size_t limit = ALIGN_DOWN(size, sizeof(wchar_t));
411	count_t offset = 0;	411	size_t offset = 0;
412		412
413	while ((offset < limit) && (*str++ != 0)) {	413	while ((offset < limit) && (*str++ != 0)) {
414	len++;	414	len++;
415	offset += sizeof(wchar_t);	415	offset += sizeof(wchar_t);
416	}	416	}
Line 494...	Line 494...
494	*	494	*
495	* @return 0 if the strings are equal, -1 if first is smaller,	495	* @return 0 if the strings are equal, -1 if first is smaller,
496	* 1 if second smaller.	496	* 1 if second smaller.
497	*	497	*
498	*/	498	*/
499	int str_lcmp(const char s1, const char s2, count_t max_len)	499	int str_lcmp(const char s1, const char s2, size_t max_len)
500	{	500	{
501	wchar_t c1 = 0;	501	wchar_t c1 = 0;
502	wchar_t c2 = 0;	502	wchar_t c2 = 0;
503		503
504	size_t off1 = 0;	504	size_t off1 = 0;
505	size_t off2 = 0;	505	size_t off2 = 0;
506		506
507	count_t len = 0;	507	size_t len = 0;
508		508
509	while (true) {	509	while (true) {
510	if (len >= max_len)	510	if (len >= max_len)
511	break;	511	break;
512		512
Line 613...	Line 613...
613	/* No space for the NULL-terminator in the buffer */	613	/* No space for the NULL-terminator in the buffer */
614	if (size == 0)	614	if (size == 0)
615	return;	615	return;
616		616
617	wchar_t ch;	617	wchar_t ch;
618	count_t src_idx = 0;	618	size_t src_idx = 0;
619	size_t dst_off = 0;	619	size_t dst_off = 0;
620		620
621	while ((ch = src[src_idx++]) != 0) {	621	while ((ch = src[src_idx++]) != 0) {
622	if (chr_encode(ch, dst, &dst_off, size) != EOK)	622	if (chr_encode(ch, dst, &dst_off, size) != EOK)
623	break;	623	break;
Line 664...	Line 664...
664	*	664	*
665	* @return True if the insertion was sucessful, false if the position	665	* @return True if the insertion was sucessful, false if the position
666	* is out of bounds.	666	* is out of bounds.
667	*	667	*
668	*/	668	*/
669	bool wstr_linsert(wchar_t *str, wchar_t ch, count_t pos, count_t max_pos)	669	bool wstr_linsert(wchar_t *str, wchar_t ch, size_t pos, size_t max_pos)
670	{	670	{
671	count_t len = wstr_length(str);	671	size_t len = wstr_length(str);
672		672
673	if ((pos > len) \|\| (pos + 1 > max_pos))	673	if ((pos > len) \|\| (pos + 1 > max_pos))
674	return false;	674	return false;
675		675
676	count_t i;	676	size_t i;
677	for (i = len; i + 1 > pos; i--)	677	for (i = len; i + 1 > pos; i--)
678	str[i + 1] = str[i];	678	str[i + 1] = str[i];
679		679
680	str[pos] = ch;	680	str[pos] = ch;
681		681
Line 692...	Line 692...
692	*	692	*
693	* @return True if the removal was sucessful, false if the position	693	* @return True if the removal was sucessful, false if the position
694	* is out of bounds.	694	* is out of bounds.
695	*	695	*
696	*/	696	*/
697	bool wstr_remove(wchar_t *str, count_t pos)	697	bool wstr_remove(wchar_t *str, size_t pos)
698	{	698	{
699	count_t len = wstr_length(str);	699	size_t len = wstr_length(str);
700		700
701	if (pos >= len)	701	if (pos >= len)
702	return false;	702	return false;
703		703
704	count_t i;	704	size_t i;
705	for (i = pos + 1; i <= len; i++)	705	for (i = pos + 1; i <= len; i++)
706	str[i - 1] = str[i];	706	str[i - 1] = str[i];
707		707
708	return true;	708	return true;
709	}	709	}

Subversion Repositories HelenOS

(root)//branches/dd/kernel/generic/src/lib/string.c – Rev 4420 → 4537