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-/* Iterating through multibyte strings: macros for multi-byte encodings.
- Copyright (C) 2001, 2005, 2007, 2009-2022 Free Software Foundation, Inc.
-
- This file is free software: you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as
- published by the Free Software Foundation; either version 2.1 of the
- License, or (at your option) any later version.
-
- This file 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 Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with this program. If not, see <https://www.gnu.org/licenses/>. */
-
-/* Written by Bruno Haible <bruno@clisp.org>. */
-
-/* The macros in this file implement forward iteration through a
- multi-byte string.
-
- With these macros, an iteration loop that looks like
-
- char *iter;
- for (iter = buf; iter < buf + buflen; iter++)
- {
- do_something (*iter);
- }
-
- becomes
-
- mbi_iterator_t iter;
- for (mbi_init (iter, buf, buflen); mbi_avail (iter); mbi_advance (iter))
- {
- do_something (mbi_cur_ptr (iter), mb_len (mbi_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.
-
- mbi_iterator_t
- is a type usable for variable declarations.
-
- mbi_init (iter, startptr, length)
- initializes the iterator, starting at startptr and crossing length bytes.
-
- mbi_avail (iter)
- returns true if there are more multibyte characters available before
- the end of string is reached. In this case, mbi_cur (iter) is
- initialized to the next multibyte character.
-
- mbi_advance (iter)
- advances the iterator by one multibyte character.
-
- mbi_cur (iter)
- returns the current multibyte character, of type mbchar_t. All the
- macros defined in mbchar.h can be used on it.
-
- mbi_cur_ptr (iter)
- return a pointer to the beginning of the current multibyte character.
-
- mbi_reloc (iter, ptrdiff)
- relocates iterator when the string is moved by ptrdiff bytes.
-
- mbi_copy (&destiter, &srciter)
- copies srciter to destiter.
-
- Here are the function prototypes of the macros.
-
- extern void mbi_init (mbi_iterator_t iter,
- const char *startptr, size_t length);
- extern bool mbi_avail (mbi_iterator_t iter);
- extern void mbi_advance (mbi_iterator_t iter);
- extern mbchar_t mbi_cur (mbi_iterator_t iter);
- extern const char * mbi_cur_ptr (mbi_iterator_t iter);
- extern void mbi_reloc (mbi_iterator_t iter, ptrdiff_t ptrdiff);
- extern void mbi_copy (mbi_iterator_t *new, const mbi_iterator_t *old);
- */
-
-#ifndef _MBITER_H
-#define _MBITER_H 1
-
-#include <assert.h>
-#include <stddef.h>
-#include <string.h>
-#include <wchar.h>
-
-#include "mbchar.h"
-
-#ifndef _GL_INLINE_HEADER_BEGIN
- #error "Please include config.h first."
-#endif
-_GL_INLINE_HEADER_BEGIN
-#ifndef MBITER_INLINE
-# define MBITER_INLINE _GL_INLINE
-#endif
-
-struct mbiter_multi
-{
- const char *limit; /* pointer to end of string */
- 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 mbi_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 mbi_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
- */
-};
-
-MBITER_INLINE void
-mbiter_multi_next (struct mbiter_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,
- iter->limit - iter->cur.ptr, &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 = iter->limit - 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;
-}
-
-MBITER_INLINE void
-mbiter_multi_reloc (struct mbiter_multi *iter, ptrdiff_t ptrdiff)
-{
- iter->cur.ptr += ptrdiff;
- iter->limit += ptrdiff;
-}
-
-MBITER_INLINE void
-mbiter_multi_copy (struct mbiter_multi *new_iter, const struct mbiter_multi *old_iter)
-{
- new_iter->limit = old_iter->limit;
- if ((new_iter->in_shift = old_iter->in_shift))
- memcpy (&new_iter->state, &old_iter->state, sizeof (mbstate_t));
- else
- memset (&new_iter->state, 0, sizeof (mbstate_t));
- new_iter->next_done = old_iter->next_done;
- mb_copy (&new_iter->cur, &old_iter->cur);
-}
-
-/* Iteration macros. */
-typedef struct mbiter_multi mbi_iterator_t;
-#define mbi_init(iter, startptr, length) \
- ((iter).cur.ptr = (startptr), (iter).limit = (iter).cur.ptr + (length), \
- (iter).in_shift = false, memset (&(iter).state, '\0', sizeof (mbstate_t)), \
- (iter).next_done = false)
-#define mbi_avail(iter) \
- ((iter).cur.ptr < (iter).limit && (mbiter_multi_next (&(iter)), true))
-#define mbi_advance(iter) \
- ((iter).cur.ptr += (iter).cur.bytes, (iter).next_done = false)
-
-/* Access to the current character. */
-#define mbi_cur(iter) (iter).cur
-#define mbi_cur_ptr(iter) (iter).cur.ptr
-
-/* Relocation. */
-#define mbi_reloc(iter, ptrdiff) mbiter_multi_reloc (&iter, ptrdiff)
-
-/* Copying an iterator. */
-#define mbi_copy mbiter_multi_copy
-
-_GL_INLINE_HEADER_END
-
-#endif /* _MBITER_H */
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