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/* Main typedefs and defines.

      Copyright (C) 1993-1998 Sebastiano Vigna 
      Copyright (C) 1999-2011 Todd M. Lewis and Sebastiano Vigna

      This file is part of ne, the nice editor.

      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 3 of the License, 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 program; if not, see <http://www.gnu.org/licenses/>.  */

#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>

#define PARAMS(protos) protos
#include "syn_types.h"
#include "syn_hash.h"
#include "syn_regex.h"
#include "syn_utf8.h"
#include "syn_utils.h"

#include <limits.h>
#include <fcntl.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>

#ifndef TERMCAP
#include <curses.h>
#include <term.h>
#include "info2cap.h"

#include <termios.h>

#include "termchar.h"
#include "utf8.h"

#define CURDIR "."
#include <unistd.h>

#ifndef min
#define   min(a,b)    ((a)<(b)?(a):(b))
#ifndef max
#define   max(a,b)    ((a)>(b)?(a):(b))

/* Include the list of all possible actions that do_action() can execute.
   Note also that menu handling is governed by such a command (ESCAPE). */

#include "enums.h"

/* The input_class of a character is a first differentiation between
   alphabetic, command-activating, and ignorable character. The class[] vector
   (indexed by the extended character code) gives back the input class. */

typedef enum {
} input_class;

extern const char *input_class_names[];

/* The name of the default preferences file name. */

#define DEF_PREFS_NAME     ".default"

/* The name of the syntax subdirectory (global and local). */

#define SYNTAX_DIR         "syntax"

/* This is the extension of syntax definition files. */

#define SYNTAX_EXT         ".jsf"

/* The name of the file containing the mappings from extensions to syntax names. */

#define EXT_2_SYN          "ext2syn"

/* This is the name taken by unnamed documents. */

#define UNNAMED_NAME       "<unnamed>"

/* The number of key codes, including ISO-8859-1 plus 256 extra codes. */

#define NUM_KEYS           (256+256)

/* A key code that has class INVALID. */

#define INVALID_CHAR       INT_MIN

/* The mask for commands. */

#define COMMAND_MASK       0x80000000

#define CHAR_CLASS(c) ( ((c)<0) ? (((-c - 1) == INVALID_CHAR) ? INVALID : COMMAND) : ((c)>0xFF) ? ALPHA : char_class[c] )

/* This number is used throughout ne when an integer has to be expanded in
   characters. It is expected that sprintf("%d")ing an integer will produce a
   string shorter than the following number. PORTABILITY PROBLEM: improbable,
   but possible. */

#define MAX_INT_LEN        32

/* A buffer or clip at any given time may be marked as ASCII, UTF-8 or
   8-bit. This means, respectively, that it contains just bytes below 0x80, an
   UTF-8-encoded byte sequence or an arbitrary byte sequence.

   The attribution is lazy, but stable. This means that a buffer starts as ASCII,
   and becomes UTF-8 or 8-bit as soon as some insertion makes it necessary. This
   is useful to delay the encoding choice as much as possible. */

typedef enum {
      ENC_ASCII = 0, ENC_UTF8, ENC_8_BIT
} encoding_type;

/* The number of bookmarks per buffer. It comprises the automatic bookmark (0). */

#define NUM_BOOKMARKS      11

/* These are the list and node structures used throughout ne. See the exec.c
   source for some elaborations on the subject. */

00138 typedef struct struct_node {
      struct struct_node *next;
      struct struct_node *prev;
} node;

00144 typedef struct {
      node *head;
      node *tail;
      node *tail_pred;
} list;

/* All the structures that follow have an assertion macro which checks for
   partial internal consistency of the structure. These macros are extensively
   used in the code. */

/* This structure represent a sequence, or stream, of NULL-terminated
   strings. It is used for many purposes, such as storage of macros, clips,
   etc. General functions allow to allocate, free, load, save and append to
   such streams. Size represent the size of the chunk of memory pointed to by
   stream, while len gives you the number of bytes currently used. You can
   append in the last size-len bytes, or realloc() stream, updating size
   correspondingly. */

00165 typedef struct {
      int size, len;
      encoding_type encoding;
      unsigned char *stream;
} char_stream;

#ifndef NDEBUG
#define assert_char_stream(cs) {if ((cs)) {\
      assert((cs)->len >= 0);\
      assert(((cs)->size == 0) == ((cs)->stream == NULL));\
#define assert_char_stream(cs) ;

/* This structure defines a line descriptor; it is a node containing a pointer
   to the line text, and an integer containing the line length in bytes. The
   line pointer by ld_text is NOT NULL-terminated. line_len is zero iff line
   is zero, in which case we are representing an empty line. ld_node->next
   is NULL iff this node is free for use. */

00190 typedef struct {
      node ld_node;
      unsigned char *line;
      int line_len;
      HIGHLIGHT_STATE highlight_state; /* Initial highlight state for this line */
} line_desc;

/* The purpose of this structure is to provide the byte count for allocating
   line descriptors when no syntax highlighting is required.  */

00200 typedef struct {
      node ld_node;
      unsigned char *line;
      int line_len;
} no_syntax_line_desc;

#ifndef NDEBUG
#define assert_line_desc(ld, encoding) {if ((ld)) { \
      assert((ld)->line_len >= 0);\
      assert(((ld)->line == NULL) == ((ld)->line_len == 0));\
      assert(((ld)->line_len == 0) || ((ld)->line[0] != 0 && (ld)->line[(ld)->line_len - 1] != 0));\
      if (encoding == ENC_UTF8) { int i = 0; while(i < (ld)->line_len) { assert(utf8len((ld)->line[i]) > 0); i = next_pos((ld)->line, i, encoding);} } \
#define assert_line_desc(ld, encoding) ;

/* This structure defines a pool of line descriptors. pool points to an
   array of size line descriptors. The first free descriptor is contained in
   first_free. The last free descriptor is contained in last_free. The
   allocated_items field keeps track of how many items are allocated. */

00223 typedef struct {
      node ldp_node;
      list free_list;
      int size;
      int allocated_items;
      line_desc *pool;
} line_desc_pool;

#ifndef NDEBUG
#define assert_line_desc_pool(ldp) {if ((ldp)) {\
      assert((ldp)->allocated_items <= (ldp)->size);\
      assert((ldp)->allocated_items == (ldp)->size || (ldp)->free_list.head->next);\
      assert((ldp)->pool != NULL);\
      assert((ldp)->size != 0);\
#define assert_line_desc_pool(ldp) ;

/* This structure defines a pool of characters. size represents the size of
   the pool pointed by pool, while first_used and last_used represent
   the min and max characters which are used. A character is not used if it
   is zero. It is perfectly possible (and likely) that between first_used
   and last_used there are many free chars, which are named "lost" chars. See
   the source buffer.c for some elaboration on the subject. */

00251 typedef struct {
      node cp_node;
      int  size, first_used, last_used;
      unsigned char *pool;
} char_pool;

#ifndef NDEBUG
#define assert_char_pool(cp) {if ((cp)) {\
      assert((cp)->pool[(cp)->first_used] != 0);\
      assert((cp)->first_used >= 0);\
      assert((cp)->first_used == 0 || (cp)->pool[(cp)->first_used - 1] == 0);\
      assert((cp)->pool[(cp)->last_used] != 0);\
      assert((cp)->last_used >= 0);\
      assert((cp)->last_used == (cp)->size - 1 || (cp)->pool[(cp)->last_used + 1] == 0);\
      assert((cp)->pool != NULL);\
      assert((cp)->size != 0);\
#define assert_char_pool(cp) ;

/* This structure defines a macro. A macro is just a stream plus a node, a
   file name and a hash code relative to the filename (it is used to make the
   search for a given macro quicker). */

00278 typedef struct struct_macro_desc {
      struct struct_macro_desc *next;
      char *name;
      char_stream *cs;
} macro_desc;

#ifndef NDEBUG
#define assert_macro_desc(md) if (md) assert_char_stream((md)->cs);
#define assert_macro_desc(md) ;

/* This structure defines a clip. Clip are numbered from 0 onwards, and
   contain a stream of characters. The stream may be optionally marked as UTF-8. */

00294 typedef struct {
      node cd_node;
      int n;
      char_stream *cs;
} clip_desc;

#ifndef NDEBUG
#define assert_clip_desc(cd) {if ((cd)) {\
      assert((cd)->n >= 0);\
#define assert_clip_desc(cd) ;

/* An undo step is given by a position, a transformation which can be
   INSERT_CHAR or DELETE_CHAR and the length of the stream to which the
   transformation applies. For compactness reasons, the transformation is
   really stored in the sign of the length. Plus means insert, minus means
   delete. Note also that pos can be negative, in which case the real position
   is -(pos+1), and the undo step is linked to the following one (in the sense
   that they should be performed indivisibly). */

00317 typedef struct {
      int line;
      int pos;
      int len;
} undo_step;

/* This structure defines an undo buffer. steps points to an array of
   steps_size undo_steps, used up to cur_step. last_step represent the undo step
   which is the next to be redone in case some undo had place. Note that the
   characters stored in streams, which are used when executing an insertion undo
   step, are not directly pointed to by the undo step. The correct position is
   calculated incrementally, and kept in cur_stream and last_stream.  Redo
   contains the stream of characters necessary to perform the redo
   steps. last_save_step is the step (if any) corresponding to the last successful
   buffer save operation. */

00336 typedef struct {
      undo_step *steps;
      char *streams;
      char_stream redo;
      int steps_size;
      int streams_size;
      int cur_step;
      int cur_stream;
      int last_step;
      int last_stream;
      int last_save_step;
} undo_buffer;

#ifndef NDEBUG
#define assert_undo_buffer(ub) {if ((ub)) {\
#define assert_undo_buffer(ub) ;

/* This structure defines all the per document options which can be
   used with PushPrefs and PopPrefs. */

00366 typedef struct {
      int cur_clip;
      int tab_size;
      int right_margin;
      unsigned int
            free_form:1,       /* Editing is free form (cursor can be anywhere) */
            hex_code:1,        /* Show hexadecimal code under the cursor */
            word_wrap:1,       /* Word wrap is on */
            auto_indent:1,     /* Replicate indentation when creating a new line */
            preserve_cr:1,     /* Preserve Carriage Returns, don't treat as line terminators. */
            insert:1,          /* Insert mode */
            do_undo:1,         /* Record each action and allow undoing it */
            auto_prefs:1,      /* Use autoprefs */
            no_file_req:1,     /* Do not display the file requester */
            read_only:1,       /* Read-only mode */
            search_back:1,     /* Last search was backwards */
            case_search:1,     /* Look at case matching in searches */
            tabs:1,            /* TAB inserts TABs vs. spaces */
            automatch:4,       /* Automatically match visible brackets */
            binary:1,          /* Load and save in binary mode */
            utf8auto:1,        /* Try to detect automatically UTF-8 */
            visual_bell:1;     /* Prefer visible bell to audible */
  } options_t;

#ifndef NDEBUG
#define assert_options(o) {if ((o)) {\
      assert((o)->tab_size > 0);\
#define assert_options(o) ;

/* This structure defines a buffer node; a buffer is composed by two lists,
   the list of line descriptor pools and the list of character pools, plus some
   data as the current window and cursor position. The line descriptors are
   kept in a list, too. The other fields are more or less self-documented.
   wanted_x represents the position the cursor would like to be on, but cannot
   because a line is too short or because it falls inside a TAB expansion. When
   a flag is declared as multilevel, this means that the flag is
   incremented/decremented rather than set/unset, so that activations and
   deactivations can be nested. */

00409 typedef struct {
      node b_node;
      list line_desc_pool_list;
      list line_desc_list;
      list char_pool_list;
      line_desc *cur_line_desc;
      line_desc *top_line_desc;
      char_stream *cur_macro;
      char_stream *last_deleted;
      char *filename;
      char *find_string;
      char *replace_string;
      char *command_line;
      int win_x, win_y;         /* line and pos of upper left-most visible character. */
      int cur_x, cur_y;         /* position of cursor within the window */
      int wanted_x;             /* desired x position modulo short lines, tabs, etc. Valid only if x_wanted is TRUE. */
      int wanted_y;             /* desired y position modulo top or bottom of buffer. Valid if y_wanted is TRUE. */
      int wanted_cur_y;         /* desired cur_y, valid if y_wanted is TRUE */
      int cur_line;             /* the current line */
      int cur_pos;              /* position of cursor within the document buffer (counts bytes) */
      int cur_char;             /* position of cursor within the attribute buffer (counts characters) */
      int num_lines;
      int block_start_line, block_start_col;
      struct {
            int shown;
            int x;                 /* Visual (on-screen) coordinates of the highlighted bracket, if shown is true. */
            int y;
      } automatch;
      int allocated_chars;
      int free_chars;
      encoding_type encoding;
      undo_buffer undo;
      struct {
            int pos;
            int line;
            int cur_y;
      } bookmark[NUM_BOOKMARKS];
      int bookmark_mask;          /* bit N is set if bookmark[N] is set */
      int cur_bookmark;           /* For Goto(Next|Prev)Bookmark. */
      struct high_syntax *syn;    /* Syntax loaded for this buffer. */
      int *attr_buf;              /* If attr_len >= 0, a pointer to the list of *current* attributes of the *current* line. */ 
      int attr_size;              /* attr_buf size. */
      int attr_len;               /* attr_buf valid number of characters, or -1 to denote that attr_buf is not valid. */
      HIGHLIGHT_STATE next_state; /* If attr_len >= 0, the state after the *current* line. */

      unsigned int

            link_undos,              /* Link the undo steps. Multilevel. */
            is_modified:1,           /* Buffer has been modified since last save */
            recording:1,             /* We are recording a macro */
            marking:1,               /* We are marking a block */
            x_wanted:1,              /* We're not where we would like to be */
            y_wanted:1,              /* We've been paging up/down */
            exec_only_options:1,     /* Only option changes can be executed */
            find_string_changed:1,   /* The search string has to be recompiled before use. */
            last_was_replace:1,      /* The last search operation was a replace */
            last_was_regexp:1,       /* The last search operation was done with regexps */
            undoing:1,               /* We are currently undoing an action */
            redoing:1,               /* We are currently redoing an action */
            mark_is_vertical:1,      /* The current marking is vertical */
            executing_internal_macro:1,  /* We are currently executing the internal macro of the current buffer */
            is_CRLF:1;               /* Buffer should be saved with CR/LF terminators */

      options_t opt;              /* These get pushed/popped on the prefs stack */
} buffer;

#ifndef NDEBUG
#define assert_buffer(b) {if ((b)) {\
      assert((b)->line_desc_list.head->next == NULL || (b)->cur_line_desc != NULL);\
      assert((b)->line_desc_list.head->next == NULL || (b)->top_line_desc != NULL);\
      assert_line_desc((b)->cur_line_desc, (b)->encoding);\
      assert_line_desc((b)->top_line_desc, (b)->encoding);\
      assert((b)->win_y + (b)->cur_y<(b)->num_lines);\
      assert((b)->num_lines > 0);\
      assert((b)->opt.tab_size > 0);\
      assert((b)->free_chars <= (b)->allocated_chars);\
      assert((b)->cur_line == (b)->win_y + (b)->cur_y);\
      assert((b)->cur_pos >= (b)->cur_line_desc->line_len || b->encoding != ENC_UTF8 || utf8len((b)->cur_line_desc->line[(b)->cur_pos] > 0));\

#define assert_buffer_content(b) {if ((b)) {\
      line_desc *ld;\
      ld = (line_desc *)b->line_desc_list.head;\
      while(ld->ld_node.next) {\
            assert_line_desc(ld, (b)->encoding);\
            if ((b)->syn) assert(ld->highlight_state.state != -1);\
            ld = (line_desc *)ld->ld_node.next;\
      assert(b->attr_len < 0 || b->attr_len == calc_char_len(b->cur_line_desc, b->encoding));\
#define assert_buffer(b) ;
#define assert_buffer_content(b);

#include "syntax.h"

extern const char *key_binding[];

extern buffer *cur_buffer;

/* These are the global lists. */

extern list buffers, clips, macros;

/* This integer keeps the global turbo parameter. */

extern int turbo;

/* If true, the current line has changed and care must be taken
   to update the initial state of the following lines. */

extern int need_attr_update;

/* If true, we want the hardwired ANSI terminal, not a real one. */

extern int ansi;

/* If true, we want requests by column, otherwise by row. */

extern int req_order;

/* The status bar is displayed */

extern int status_bar;

/* If true, we want abbreviated screen updates. */

extern int fast_gui;

/* Recorded macros use long command names */

extern int verbose_macros;

/* If true, we want syntax highlighting. */

extern int do_syntax;

/* This flag can be set anywhere to FALSE, and will become TRUE if the user
   hits the interrupt key (usually CTRL-'\'). It is handled through SIGQUIT and
   SIGINT. */

extern unsigned int stop;

/* This is set by the signal handler whenever a SIGWINCH happens. */

extern unsigned int window_changed_size;

/* This vector associates to an extended key code (as returned by
get_key_code()) its input class. */

extern const input_class char_class[];

/* A boolean recording whether the last replace was for an empty string 
  (of course, this can happen only with regular expressions). */

extern int last_replace_empty_match;

/* This number defines the macro hash table size. This table can have
   conflicts. */


/* Upcasing vectors for the regex library. */
extern unsigned char localised_up_case[];
extern const unsigned char ascii_up_case[];

#include "keycodes.h"
#include "names.h"
#include "errors.h"
#include "protos.h"
#include "utf8.h"
#include "debug.h"

/* In the unfortunate case we are compiling in some known system
   with a completely different handling of binary and ASCII files,
   we force the use of binary files. */

#ifdef O_BINARY

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