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Diffstat (limited to 'gl/mbuiter.h')
| -rw-r--r-- | gl/mbuiter.h | 203 |
1 files changed, 0 insertions, 203 deletions
diff --git a/gl/mbuiter.h b/gl/mbuiter.h deleted file mode 100644 index 9da3a6c7..00000000 --- a/gl/mbuiter.h +++ /dev/null @@ -1,203 +0,0 @@ -/* Iterating through multibyte strings: macros for multi-byte encodings. - Copyright (C) 2001, 2005 Free Software Foundation, Inc. - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2, or (at your option) - any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software Foundation, - Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -/* Written by Bruno Haible <bruno@clisp.org>. */ - -/* The macros in this file implement forward iteration through a - multi-byte string, without knowing its length a-priori. - - With these macros, an iteration loop that looks like - - char *iter; - for (iter = buf; *iter != '\0'; iter++) - { - do_something (*iter); - } - - becomes - - mbui_iterator_t iter; - for (mbui_init (iter, buf); mbui_avail (iter); mbui_advance (iter)) - { - do_something (mbui_cur_ptr (iter), mb_len (mbui_cur (iter))); - } - - The benefit of these macros over plain use of mbrtowc is: - - Handling of invalid multibyte sequences is possible without - making the code more complicated, while still preserving the - invalid multibyte sequences. - - Compared to mbiter.h, the macros here don't need to know the string's - length a-priori. The downside is that at each step, the look-ahead - that guards against overrunning the terminating '\0' is more expensive. - The mbui_* macros are therefore suitable when there is a high probability - that only the first few multibyte characters need to be inspected. - Whereas the mbi_* macros are better if usually the iteration runs - through the entire string. - - mbui_iterator_t - is a type usable for variable declarations. - - mbui_init (iter, startptr) - initializes the iterator, starting at startptr. - - mbui_avail (iter) - returns true if there are more multibyte chracters available before - the end of string is reached. In this case, mbui_cur (iter) is - initialized to the next multibyte chracter. - - mbui_advance (iter) - advances the iterator by one multibyte character. - - mbui_cur (iter) - returns the current multibyte character, of type mbchar_t. All the - macros defined in mbchar.h can be used on it. - - mbui_cur_ptr (iter) - return a pointer to the beginning of the current multibyte character. - - mbui_reloc (iter, ptrdiff) - relocates iterator when the string is moved by ptrdiff bytes. - - Here are the function prototypes of the macros. - - extern void mbui_init (mbui_iterator_t iter, const char *startptr); - extern bool mbui_avail (mbui_iterator_t iter); - extern void mbui_advance (mbui_iterator_t iter); - extern mbchar_t mbui_cur (mbui_iterator_t iter); - extern const char * mbui_cur_ptr (mbui_iterator_t iter); - extern void mbui_reloc (mbui_iterator_t iter, ptrdiff_t ptrdiff); - */ - -#ifndef _MBUITER_H -#define _MBUITER_H 1 - -#include <assert.h> -#include <stdbool.h> -#include <stdlib.h> - -/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before - <wchar.h>. - BSD/OS 4.1 has a bug: <stdio.h> and <time.h> must be included before - <wchar.h>. */ -#include <stdio.h> -#include <time.h> -#include <wchar.h> - -#include "mbchar.h" -#include "strnlen1.h" - -struct mbuiter_multi -{ - bool in_shift; /* true if next byte may not be interpreted as ASCII */ - mbstate_t state; /* if in_shift: current shift state */ - bool next_done; /* true if mbui_avail has already filled the following */ - struct mbchar cur; /* the current character: - const char *cur.ptr pointer to current character - The following are only valid after mbui_avail. - size_t cur.bytes number of bytes of current character - bool cur.wc_valid true if wc is a valid wide character - wchar_t cur.wc if wc_valid: the current character - */ -}; - -static inline void -mbuiter_multi_next (struct mbuiter_multi *iter) -{ - if (iter->next_done) - return; - if (iter->in_shift) - goto with_shift; - /* Handle most ASCII characters quickly, without calling mbrtowc(). */ - if (is_basic (*iter->cur.ptr)) - { - /* These characters are part of the basic character set. ISO C 99 - guarantees that their wide character code is identical to their - char code. */ - iter->cur.bytes = 1; - iter->cur.wc = *iter->cur.ptr; - iter->cur.wc_valid = true; - } - else - { - assert (mbsinit (&iter->state)); - iter->in_shift = true; - with_shift: - iter->cur.bytes = mbrtowc (&iter->cur.wc, iter->cur.ptr, - strnlen1 (iter->cur.ptr, MB_CUR_MAX), - &iter->state); - if (iter->cur.bytes == (size_t) -1) - { - /* An invalid multibyte sequence was encountered. */ - iter->cur.bytes = 1; - iter->cur.wc_valid = false; - /* Whether to set iter->in_shift = false and reset iter->state - or not is not very important; the string is bogus anyway. */ - } - else if (iter->cur.bytes == (size_t) -2) - { - /* An incomplete multibyte character at the end. */ - iter->cur.bytes = strlen (iter->cur.ptr); - iter->cur.wc_valid = false; - /* Whether to set iter->in_shift = false and reset iter->state - or not is not important; the string end is reached anyway. */ - } - else - { - if (iter->cur.bytes == 0) - { - /* A null wide character was encountered. */ - iter->cur.bytes = 1; - assert (*iter->cur.ptr == '\0'); - assert (iter->cur.wc == 0); - } - iter->cur.wc_valid = true; - - /* When in the initial state, we can go back treating ASCII - characters more quickly. */ - if (mbsinit (&iter->state)) - iter->in_shift = false; - } - } - iter->next_done = true; -} - -static inline void -mbuiter_multi_reloc (struct mbuiter_multi *iter, ptrdiff_t ptrdiff) -{ - iter->cur.ptr += ptrdiff; -} - -/* Iteration macros. */ -typedef struct mbuiter_multi mbui_iterator_t; -#define mbui_init(iter, startptr) \ - ((iter).cur.ptr = (startptr), \ - (iter).in_shift = false, memset (&(iter).state, '\0', sizeof (mbstate_t)), \ - (iter).next_done = false) -#define mbui_avail(iter) \ - (mbuiter_multi_next (&(iter)), !mb_isnul ((iter).cur)) -#define mbui_advance(iter) \ - ((iter).cur.ptr += (iter).cur.bytes, (iter).next_done = false) - -/* Access to the current character. */ -#define mbui_cur(iter) (iter).cur -#define mbui_cur_ptr(iter) (iter).cur.ptr - -/* Relocation. */ -#define mbui_reloc(iter, ptrdiff) mbuiter_multi_reloc (&iter, ptrdiff) - -#endif /* _MBUITER_H */ |