зеркало из https://github.com/mozilla/pjs.git
243 строки
6.5 KiB
C
243 строки
6.5 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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/* uft8.c - misc. utf8 "string" functions. */
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#include "ldap.h"
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#include "ldap-int.h"
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static char UTF8len[64]
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= {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 5, 6};
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int
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LDAP_CALL
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ldap_utf8len (const char* s)
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/* Return the number of char's in the character at *s. */
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{
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return ldap_utf8next((char*)s) - s;
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}
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char*
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LDAP_CALL
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ldap_utf8next (char* s)
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/* Return a pointer to the character immediately following *s.
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Handle any valid UTF-8 character, including '\0' and ASCII.
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Try to handle a misaligned pointer or a malformed character.
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*/
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{
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register unsigned char* next = (unsigned char*)s;
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switch (UTF8len [(*next >> 2) & 0x3F]) {
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case 0: /* erroneous: s points to the middle of a character. */
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case 6: if ((*++next & 0xC0) != 0x80) break;
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case 5: if ((*++next & 0xC0) != 0x80) break;
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case 4: if ((*++next & 0xC0) != 0x80) break;
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case 3: if ((*++next & 0xC0) != 0x80) break;
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case 2: if ((*++next & 0xC0) != 0x80) break;
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case 1: ++next;
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}
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return (char*) next;
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}
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char*
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LDAP_CALL
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ldap_utf8prev (char* s)
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/* Return a pointer to the character immediately preceding *s.
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Handle any valid UTF-8 character, including '\0' and ASCII.
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Try to handle a misaligned pointer or a malformed character.
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*/
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{
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register unsigned char* prev = (unsigned char*)s;
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unsigned char* limit = prev - 6;
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while (((*--prev & 0xC0) == 0x80) && (prev != limit)) {
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;
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}
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return (char*) prev;
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}
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int
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LDAP_CALL
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ldap_utf8copy (char* dst, const char* src)
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/* Copy a character from src to dst; return the number of char's copied.
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Handle any valid UTF-8 character, including '\0' and ASCII.
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Try to handle a misaligned pointer or a malformed character.
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*/
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{
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register const unsigned char* s = (const unsigned char*)src;
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switch (UTF8len [(*s >> 2) & 0x3F]) {
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case 0: /* erroneous: s points to the middle of a character. */
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case 6: *dst++ = *s++; if ((*s & 0xC0) != 0x80) break;
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case 5: *dst++ = *s++; if ((*s & 0xC0) != 0x80) break;
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case 4: *dst++ = *s++; if ((*s & 0xC0) != 0x80) break;
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case 3: *dst++ = *s++; if ((*s & 0xC0) != 0x80) break;
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case 2: *dst++ = *s++; if ((*s & 0xC0) != 0x80) break;
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case 1: *dst = *s++;
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}
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return s - (const unsigned char*)src;
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}
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size_t
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LDAP_CALL
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ldap_utf8characters (const char* src)
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/* Return the number of UTF-8 characters in the 0-terminated array s. */
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{
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register char* s = (char*)src;
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size_t n;
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for (n = 0; *s; LDAP_UTF8INC(s)) ++n;
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return n;
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}
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unsigned long LDAP_CALL
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ldap_utf8getcc( const char** src )
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{
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register unsigned long c;
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register const unsigned char* s = (const unsigned char*)*src;
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switch (UTF8len [(*s >> 2) & 0x3F]) {
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case 0: /* erroneous: s points to the middle of a character. */
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c = (*s++) & 0x3F; goto more5;
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case 1: c = (*s++); break;
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case 2: c = (*s++) & 0x1F; goto more1;
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case 3: c = (*s++) & 0x0F; goto more2;
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case 4: c = (*s++) & 0x07; goto more3;
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case 5: c = (*s++) & 0x03; goto more4;
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case 6: c = (*s++) & 0x01; goto more5;
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more5: if ((*s & 0xC0) != 0x80) break; c = (c << 6) | ((*s++) & 0x3F);
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more4: if ((*s & 0xC0) != 0x80) break; c = (c << 6) | ((*s++) & 0x3F);
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more3: if ((*s & 0xC0) != 0x80) break; c = (c << 6) | ((*s++) & 0x3F);
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more2: if ((*s & 0xC0) != 0x80) break; c = (c << 6) | ((*s++) & 0x3F);
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more1: if ((*s & 0xC0) != 0x80) break; c = (c << 6) | ((*s++) & 0x3F);
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break;
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}
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*src = (const char*)s;
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return c;
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}
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char*
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LDAP_CALL
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ldap_utf8strtok_r( char* sp, const char* brk, char** next)
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{
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const char *bp;
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unsigned long sc, bc;
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char *tok;
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if (sp == NULL && (sp = *next) == NULL)
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return NULL;
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/* Skip leading delimiters; roughly, sp += strspn(sp, brk) */
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cont:
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sc = LDAP_UTF8GETC(sp);
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for (bp = brk; (bc = LDAP_UTF8GETCC(bp)) != 0;) {
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if (sc == bc)
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goto cont;
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}
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if (sc == 0) { /* no non-delimiter characters */
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*next = NULL;
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return NULL;
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}
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tok = LDAP_UTF8PREV(sp);
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/* Scan token; roughly, sp += strcspn(sp, brk)
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* Note that brk must be 0-terminated; we stop if we see that, too.
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*/
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while (1) {
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sc = LDAP_UTF8GETC(sp);
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bp = brk;
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do {
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if ((bc = LDAP_UTF8GETCC(bp)) == sc) {
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if (sc == 0) {
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*next = NULL;
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} else {
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*next = sp;
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*(LDAP_UTF8PREV(sp)) = 0;
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}
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return tok;
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}
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} while (bc != 0);
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}
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/* NOTREACHED */
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}
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int
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LDAP_CALL
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ldap_utf8isalnum( char* s )
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{
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register unsigned char c = *(unsigned char*)s;
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if (0x80 & c) return 0;
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if (c >= 'A' && c <= 'Z') return 1;
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if (c >= 'a' && c <= 'z') return 1;
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if (c >= '0' && c <= '9') return 1;
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return 0;
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}
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int
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LDAP_CALL
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ldap_utf8isalpha( char* s )
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{
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register unsigned char c = *(unsigned char*)s;
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if (0x80 & c) return 0;
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if (c >= 'A' && c <= 'Z') return 1;
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if (c >= 'a' && c <= 'z') return 1;
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return 0;
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}
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int
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LDAP_CALL
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ldap_utf8isdigit( char* s )
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{
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register unsigned char c = *(unsigned char*)s;
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if (0x80 & c) return 0;
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if (c >= '0' && c <= '9') return 1;
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return 0;
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}
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int
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LDAP_CALL
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ldap_utf8isxdigit( char* s )
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{
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register unsigned char c = *(unsigned char*)s;
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if (0x80 & c) return 0;
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if (c >= '0' && c <= '9') return 1;
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if (c >= 'A' && c <= 'F') return 1;
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if (c >= 'a' && c <= 'f') return 1;
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return 0;
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}
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int
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LDAP_CALL
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ldap_utf8isspace( char* s )
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{
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register unsigned char c = *(unsigned char*)s;
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if (0x80 & c) return 0;
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switch (c) {
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case ' ':
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case '\t':
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case '\n':
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case '\r':
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case '\v':
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case '\f':
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return 1;
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default: break;
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}
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return 0;
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}
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