gecko-dev/extensions/xmlterm/lineterm/unistring.c

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C

/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "MPL"); you may not use this file
* except in compliance with the MPL. You may obtain a copy of
* the MPL at http://www.mozilla.org/MPL/
*
* Software distributed under the MPL is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the MPL for the specific language governing
* rights and limitations under the MPL.
*
* The Original Code is lineterm.
*
* The Initial Developer of the Original Code is Ramalingam Saravanan.
* Portions created by Ramalingam Saravanan <svn@xmlterm.org> are
* Copyright (C) 1999 Ramalingam Saravanan. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU General Public License (the "GPL"), in which case
* the provisions of the GPL are applicable instead of
* those above. If you wish to allow use of your version of this
* file only under the terms of the GPL and not to allow
* others to use your version of this file under the MPL, indicate
* your decision by deleting the provisions above and replace them
* with the notice and other provisions required by the GPL.
* If you do not delete the provisions above, a recipient
* may use your version of this file under either the MPL or the
* GPL.
*/
/* unistring.c: Unicode string operations implementation */
/* public declarations */
#include "unistring.h"
/* private declarations */
/** Encodes Unicode string US with NUS characters into UTF8 string S with
* upto NS characters, returning the number of REMAINING Unicode characters
* and the number of ENCODED Utf8 characters
*/
void ucstoutf8(const UNICHAR* us, int nus, char* s, int ns,
int* remaining, int* encoded)
{
int j, k;
j = 0;
k = 0;
while ((j < ns) && (k < nus)) {
UNICHAR uch = us[k++];
if (uch < 0x0080) {
s[j++] = uch;
} else if (uch < 0x0800) {
if (j >= ns-1) break;
s[j++] = ((uch & 0x07C0) >> 6) | 0xC0;
s[j++] = (uch & 0x003F) | 0x80;
} else {
if (j >= ns-2) break;
s[j++] = ((uch & 0xF000) >> 12) | 0xE0;
s[j++] = ((uch & 0x0FC0) >> 6) | 0x80;
s[j++] = (uch & 0x003F) | 0x80;
}
}
if (remaining)
*remaining = nus - k;
if (encoded)
*encoded = j;
}
/** Decodes UTF8 string S with NS characters to Unicode string US with
* upto NUS characters, returning the number of REMAINING Utf8 characters
* and the number of DECODED Unicode characters.
* If skipNUL is non-zero, NUL input characters are skipped.
* returns 0 if successful,
* -1 if an error occurred during decoding
*/
int utf8toucs(const char* s, int ns, UNICHAR* us, int nus,
int skipNUL, int* remaining, int* decoded)
{
int j, k;
int retcode = 0;
j = 0;
k = 0;
while ((j < ns) && (k < nus)) {
char ch = s[j];
if (0x80 & ch) {
if (0x40 & ch) {
if (0x20 & ch) {
/* consume 3 */
if (j >= ns-2) break;
if ( (s[j+1] & 0x40) || !(s[j+1] & 0x80) ||
(s[j+2] & 0x40) || !(s[j+2] & 0x80) ) {
retcode = -1;
}
us[k++] = ((ch & 0x0F) << 12)
| ((s[j+1] & 0x3F) << 6)
| ( s[j+2] & 0x3F);
j += 3;
} else {
/* consume 2 */
if (j >= ns-1) break;
if ( (s[j+1] & 0x40) || !(s[j+1] & 0x80) ) {
retcode = -1;
}
us[k++] = ((ch & 0x1F) << 6)
| ( s[j+1] & 0x3F);
j += 2;
}
} else {
/* consume 1 (error) */
retcode = -1;
j++;
}
} else {
/* consume 1 */
if (ch || !skipNUL) {
us[k++] = ch;
}
j++;
}
}
if (remaining)
*remaining = ns - j;
if (decoded)
*decoded = k;
return retcode;
}
/** Prints Unicode string US with NUS characters to file stream STREAM,
* escaping non-printable ASCII characters and all non-ASCII characters
*/
void ucsprint(FILE* stream, const UNICHAR* us, int nus)
{
static const char hexDigits[17] = "0123456789abcdef";
UNICHAR uch;
int k;
for (k=0; k<nus; k++) {
uch = us[k];
if (uch < (UNICHAR)U_SPACE) {
/* ASCII control character */
fprintf(stream, "^%c", (char) uch+U_ATSIGN);
} else if (uch == (UNICHAR)U_CARET) {
/* Caret */
fprintf(stream, "^^");
} else if (uch < (UNICHAR)U_DEL) {
/* Printable ASCII character */
fprintf(stream, "%c", (char) uch);
} else {
/* DEL or non-ASCII character */
char esc_str[8]="&#0000;";
int j;
for (j=5; j>1; j--) {
esc_str[j] = hexDigits[uch%16];
uch = uch / 16;
}
fprintf(stream, "%s", esc_str);
}
}
}
/** Copy exactly n characters from plain character source string to UNICHAR
* destination string, ignoring source characters past a null character and
* padding the destination with null characters if necessary.
*/
UNICHAR* ucscopy(register UNICHAR* dest, register const char* srcplain,
size_t n)
{
register UNICHAR ch;
register const UNICHAR* destmx = dest + n;
/* Copy characters from source to destination, stopping at NUL */
while (dest < destmx) {
*dest++ = (ch = *srcplain++);
if (ch == U_NUL)
break;
}
/* Pad with NULs, if necessary */
while (dest < destmx)
*dest++ = U_NUL;
return dest;
}
#ifndef USE_WCHAR
/** Locates first occurrence of character within string and returns pointer
* to it if found, else returning null pointer. (character may be NUL)
*/
UNICHAR* ucschr(register const UNICHAR* str, register const UNICHAR chr)
{
do {
if (*str == chr)
return (UNICHAR*) str;
} while (*str++ != U_NUL);
return NULL;
}
/** Locates last occurrence of character within string and returns pointer
* to it if found, else returning null pointer. (character may be NUL)
*/
UNICHAR* ucsrchr(register const UNICHAR* str, register const UNICHAR chr)
{
const UNICHAR* retstr = NULL;
do {
if (*str == chr)
retstr = str;
} while (*str++ != U_NUL);
return (UNICHAR*) retstr;
}
/** Compare all characters between string1 and string2, returning
* a zero value if all characters are equal, or returning
* character1 - character2 for the first character that is different
* between the two strings.
* (Characters following a null character are not compared.)
*/
int ucscmp(register const UNICHAR* str1, register const UNICHAR* str2)
{
register UNICHAR ch1, ch2;
do {
if ((ch1 = *str1++) != (ch2 = *str2++))
return ch1 - ch2;
} while (ch1 != U_NUL);
return 0;
}
/** Compare upto n characters between string1 and string2, returning
* a zero value if all compared characters are equal, or returning
* character1 - character2 for the first character that is different
* between the two strings.
* (Characters following a null character are not compared.)
*/
int ucsncmp(register const UNICHAR* str1, register const UNICHAR* str2,
size_t n)
{
register UNICHAR ch1, ch2;
register const UNICHAR* str1mx = str1 + n;
while (str1 < str1mx) {
if ((ch1 = *str1++) != (ch2 = *str2++))
return ch1 - ch2;
if (ch1 == U_NUL)
break;
}
return 0;
}
/** Copy exactly n characters from source to destination, ignoring source
* characters past a null character and padding the destination with null
* characters if necessary.
*/
UNICHAR* ucsncpy(register UNICHAR* dest, register const UNICHAR* src,
size_t n)
{
register UNICHAR ch;
register const UNICHAR* destmx = dest + n;
/* Copy characters from source to destination, stopping at NUL */
while (dest < destmx) {
*dest++ = (ch = *src++);
if (ch == U_NUL)
break;
}
/* Pad with NULs, if necessary */
while (dest < destmx)
*dest++ = U_NUL;
return dest;
}
/** Returns string length
*/
size_t ucslen(const UNICHAR* str)
{
register const UNICHAR* strcp = str;
while (*strcp++ != U_NUL);
return strcp - str - 1;
}
/** Locates substring within string and returns pointer to it if found,
* else returning null pointer. If substring has zero length, then full
* string is returned.
*/
UNICHAR* ucsstr(register const UNICHAR* str, const UNICHAR* substr)
{
register UNICHAR subch1, ch;
/* If null substring, return string */
if (*substr == U_NUL)
return (UNICHAR*) str;
/* First character of non-null substring */
subch1 = *substr;
if ((ch = *str) == U_NUL)
return NULL;
do {
if (ch == subch1) {
/* First character matches; check if rest of substring matches */
register const UNICHAR* strcp = str;
register const UNICHAR* substrcp = substr;
do {
substrcp++;
strcp++;
if (*substrcp == U_NUL)
return (UNICHAR*) str;
} while (*substrcp == *strcp);
}
} while ((ch = *(++str)) != U_NUL);
return NULL;
}
/** Returns length of longest initial segment of string that contains
* only the specified characters.
*/
size_t ucsspn(const UNICHAR* str, const UNICHAR* chars)
{
register UNICHAR strch, ch;
register const UNICHAR* charscp;
register const UNICHAR* strcp = str;
while ((strch = *strcp++) != U_NUL) {
charscp = chars;
/* Check that it is one of the specified characters */
while ((ch = *charscp++) != U_NUL) {
if (strch == ch)
break;
}
if (ch == U_NUL)
return (size_t) (strcp - str - 1);
}
return (size_t) (strcp - str - 1);
}
/** Returns length of longest initial segment of string that does not
* contain any of the specified characters.
*/
size_t ucscspn(const UNICHAR* str, const UNICHAR* chars)
{
register UNICHAR strch, ch;
register const UNICHAR* charscp;
register const UNICHAR* strcp = str;
while ((strch = *strcp++) != U_NUL) {
charscp = chars;
/* Check that it is not one of the specified characters */
while ((ch = *charscp++) != U_NUL) {
if (strch == ch)
return (size_t) (strcp - str - 1);
}
}
return (size_t) (strcp - str - 1);
}
#endif /* !USE_WCHAR */