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Diffstat (limited to 'contrib/libio/editbuf.h')
| -rw-r--r-- | contrib/libio/editbuf.h | 185 |
1 files changed, 0 insertions, 185 deletions
diff --git a/contrib/libio/editbuf.h b/contrib/libio/editbuf.h deleted file mode 100644 index d15758f..0000000 --- a/contrib/libio/editbuf.h +++ /dev/null @@ -1,185 +0,0 @@ -/* This is part of libio/iostream, providing -*- C++ -*- input/output. -Copyright (C) 1993 Free Software Foundation - -This file is part of the GNU IO Library. This library 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 library 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 library; see the file COPYING. If not, write to the Free -Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - -As a special exception, if you link this library with files -compiled with a GNU compiler to produce an executable, this does not cause -the resulting executable to be covered by the GNU General Public License. -This exception does not however invalidate any other reasons why -the executable file might be covered by the GNU General Public License. - -Written by Per Bothner (bothner@cygnus.com). */ - -#ifndef _EDITBUF_H -#define _EDITBUF_H -#ifdef __GNUG__ -#pragma interface -#endif -#include <stdio.h> -#include <fstream.h> - -extern "C++" { -typedef unsigned long mark_pointer; -// At some point, it might be nice to parameterize this code -// in terms of buf_char. -typedef /*unsigned*/ char buf_char; - -// Logical pos from start of buffer (does not count gap). -typedef long buf_index; - -// Pos from start of buffer, possibly including gap_size. -typedef long buf_offset; - -#if 0 -struct buf_cookie { - FILE *file; - struct edit_string *str; - struct buf_cookie *next; - buf_index tell(); -}; -#endif - -struct edit_buffer; -struct edit_mark; - -// A edit_string is defined as the region between the 'start' and 'end' marks. -// Normally (always?) 'start->insert_before()' should be false, -// and 'end->insert_before()' should be true. - -struct edit_string { - struct edit_buffer *buffer; // buffer that 'start' and 'end' belong to - struct edit_mark *start, *end; - int length() const; // count of buf_chars currently in string - edit_string(struct edit_buffer *b, - struct edit_mark *ms, struct edit_mark *me) - { buffer = b; start = ms; end = me; } -/* Make a fresh, contiguous copy of the data in STR. - Assign length of STR to *LENP. - (Output has extra NUL at out[*LENP].) */ - buf_char *copy_bytes(int *lenp) const; -// FILE *open_file(char *mode); - void assign(struct edit_string *src); // copy bytes from src to this -}; - -struct edit_streambuf : public streambuf { - friend edit_buffer; - edit_string *str; - edit_streambuf* next; // Chain of edit_streambuf's for a edit_buffer. - short _mode; - edit_streambuf(edit_string* bstr, int mode); - ~edit_streambuf(); - virtual int underflow(); - virtual int overflow(int c = EOF); - virtual streampos seekoff(streamoff, _seek_dir, int mode=ios::in|ios::out); - void flush_to_buffer(); - void flush_to_buffer(edit_buffer* buffer); - int _inserting; - int inserting() { return _inserting; } - void inserting(int i) { _inserting = i; } -// int delete_chars(int count, char* cut_buf); Not implemented. - int truncate(); - int is_reading() { return gptr() != NULL; } - buf_char* current() { return is_reading() ? gptr() : pptr(); } - void set_current(char *p, int is_reading); - protected: - void disconnect_gap_from_file(edit_buffer* buffer); -}; - -// A 'edit_mark' indicates a position in a buffer. -// It is "attached" the text (rather than the offset). -// There are two kinds of mark, which have different behavior -// when text is inserted at the mark: -// If 'insert_before()' is true the mark will be adjusted to be -// *after* the new text. - -struct edit_mark { - struct edit_mark *chain; - mark_pointer _pos; - inline int insert_before() { return _pos & 1; } - inline unsigned long index_in_buffer(struct edit_buffer *) - { return _pos >> 1; } - inline buf_char *ptr(struct edit_buffer *buf); - buf_index tell(); - edit_mark() { } - edit_mark(struct edit_string *str, long delta); - edit_buffer *buffer(); - ~edit_mark(); -}; - -// A 'edit_buffer' consists of a sequence of buf_chars (the data), -// a list of edit_marks pointing into the data, and a list of FILEs -// also pointing into the data. -// A 'edit_buffer' coerced to a edit_string is the string of -// all the buf_chars in the buffer. - -// This implementation uses a conventional buffer gap (as in Emacs). -// The gap start is defined by de-referencing a (buf_char**). -// This is because sometimes a FILE is inserting into the buffer, -// so rather than having each putc adjust the gap, we use indirection -// to have the gap be defined as the write pointer of the FILE. -// (This assumes that putc adjusts a pointer (as in GNU's libc), not an index.) - -struct edit_buffer { - buf_char *data; /* == emacs buffer_text.p1+1 */ - buf_char *_gap_start; - edit_streambuf* _writer; // If non-NULL, currently writing stream - inline buf_char *gap_start() - { return _writer ? _writer->pptr() : _gap_start; } - buf_offset __gap_end_pos; // size of part 1 + size of gap - /* int gap; implicit: buf_size - size1 - size2 */ - int buf_size; - struct edit_streambuf *files; - struct edit_mark start_mark; - struct edit_mark end_mark; - edit_buffer(); - inline buf_offset gap_end_pos() { return __gap_end_pos; } - inline struct edit_mark *start_marker() { return &start_mark; } - inline struct edit_mark *end_marker() { return &end_mark; } -/* these should be protected, ultimately */ - buf_index tell(edit_mark*); - buf_index tell(buf_char*); - inline buf_char *gap_end() { return data + gap_end_pos(); } - inline int gap_size() { return gap_end() - gap_start(); } - inline int size1() { return gap_start() - data; } - inline int size2() { return buf_size - gap_end_pos(); } - inline struct edit_mark * mark_list() { return &start_mark; } - void make_gap (buf_offset); - void move_gap (buf_offset pos); - void move_gap (buf_char *pos) { move_gap(pos - data); } - void gap_left (int pos); - void gap_right (int pos); - void adjust_markers(mark_pointer low, mark_pointer high, - int amount, buf_char *old_data); - void delete_range(buf_index from, buf_index to); - void delete_range(struct edit_mark *start, struct edit_mark *end); -}; - -extern buf_char * bstr_copy(struct edit_string *str, int *lenp); - -// Convert a edit_mark to a (buf_char*) - -inline buf_char *edit_mark::ptr(struct edit_buffer *buf) - { return buf->data + index_in_buffer(buf); } - -inline void edit_streambuf::flush_to_buffer() -{ - edit_buffer* buffer = str->buffer; - if (buffer->_writer == this) flush_to_buffer(buffer); -} -} // extern "C++" -#endif /* !_EDITBUF_H*/ - |
