ed.c

包括文件操作、图形系统、并口串口编程、鼠标编程、小型cad系统、编译器、病毒防火墙、海底大战等多个实例。

#include "tdestr.h"     
#include "define.h"     
#include "tdefunc.h"    
#include "global.h"     
#include "prompts.h"    
#include "default.h"    



int  insert_newline( WINDOW *window )
{
char *source;           
char *dest;             
int  len;               
int  split_len;
int  add;               
int  rcol;
int  rc;
long length;
int  carriage_return;
int  split_line;
int  wordwrap;
int  dirty;
int  old_bcol;
register WINDOW *win;   
file_infos *file;       
line_list_ptr new_node;
text_ptr new_line;      

   rc = OK;
   win = window;
   file = win->file_info;
   length = file->length;
   wordwrap = mode.word_wrap;
   switch (g_status.command) {
      case WordWrap :
         carriage_return = TRUE;
         split_line = FALSE;
         break;
      case AddLine  :
         split_line = carriage_return = FALSE;
         break;
      case SplitLine :
         split_line = carriage_return = TRUE;
         break;
      case Rturn :
      default    :

        
         if (file->crlf == BINARY)
            return( next_line( win ) );

         show_ruler_char( win );
         carriage_return = TRUE;
         split_line = FALSE;
         break;
   }

   
   new_node = (line_list_ptr)my_malloc( sizeof(line_list_struc), &rc );
   new_line = NULL;
   win->visible = FALSE;
   old_bcol = win->bcol;
   if (rc == OK) {
      new_node->line  = new_line;
      new_node->len   = 0;
      new_node->dirty = FALSE;

      if (win->ll->len != EOF) {
         win->file_info->modified = TRUE;
         if (mode.do_backups == TRUE)
            rc = backup_file( win );
         copy_line( win->ll );
         detab_linebuff( );
         len = g_status.line_buff_len;
         split_len = 0;
         if (win->rcol < len)
            win->ll->dirty = TRUE;

         source = g_status.line_buff + len;
         if (carriage_return || split_line) {
            if (win->rcol < len) {
               source = g_status.line_buff + win->rcol;
               split_len = len - win->rcol;
               len = win->rcol;
            }
         }
         g_status.line_buff_len = len;
         entab_linebuff( );
         if (un_copy_line( win->ll, win, TRUE ) == OK) {

            assert( split_len >= 0 );
            assert( split_len < MAX_LINE_LENGTH );

            memmove( g_status.line_buff, source, split_len );
            g_status.line_buff_len = len = split_len;
            g_status.copied = TRUE;
            entab_linebuff( );
         } else
            rc = ERROR;
      } else {
         g_status.line_buff_len = len = 0;
         g_status.copied = TRUE;
      }

      if (rc == OK) {
         new_node->line  = new_line;
         new_node->len   = 0;
         new_node->dirty = TRUE;

         
         if (win->ll->next != NULL) {
            win->ll->next->prev = new_node;
            new_node->next = win->ll->next;
            win->ll->next = new_node;
            new_node->prev = win->ll;
         } else {
            new_node->next = win->ll;
            if (win->ll->prev != NULL)
               win->ll->prev->next = new_node;
            new_node->prev = win->ll->prev;
            win->ll->prev = new_node;
            if (new_node->prev == NULL)
               win->file_info->line_list = new_node;
            win->ll = new_node;
         }

         ++file->length;
         detab_linebuff( );
         entab_linebuff( );
         rc = un_copy_line( new_node, win, FALSE );
         adjust_windows_cursor( win, 1 );

         file->dirty = NOT_LOCAL;
         if (length == 0l || wordwrap || win->cline == win->bottom_line)
            file->dirty = GLOBAL;
         else if (!split_line)
            update_line( win );

        
         if (rc == OK  &&  (carriage_return || split_line)) {
            dirty = file->dirty;
            if (win->cline < win->bottom_line)
               win->cline++;
            win->rline++;
            if (win->ll->next != NULL) {
               win->bin_offset += win->ll->len;
               win->ll = win->ll->next;
            }
            rcol = win->rcol;
            old_bcol = win->bcol;

            if (win->ll->next != NULL) {
               if (mode.indent || wordwrap) {
               
                  add = find_left_margin( wordwrap == FIXED_WRAP ?
                                          win->ll : win->ll->prev, wordwrap );

                  assert( add >= 0 );
                  assert( add < MAX_LINE_LENGTH );

                  copy_line( win->ll );
                  detab_linebuff( );
                  len = g_status.line_buff_len;
                  source = g_status.line_buff;
                  if (len + add > MAX_LINE_LENGTH)
                     add = MAX_LINE_LENGTH - len;
                  dest = source + add;

                  assert( len >= 0);
                  assert( len < MAX_LINE_LENGTH );

                  memmove( dest, source, len );


                  assert( add >= 0 );
                  assert( add < MAX_LINE_LENGTH );

                  memset( source, ' ', add );
                  win->rcol = add;
                  g_status.line_buff_len += add;
                  entab_linebuff( );
                  rc = un_copy_line( win->ll, win, TRUE );
               } else
                  win->rcol = 0;
            }
            if (rc == OK  &&  split_line) {
               win->rline--;
               win->ll = win->ll->prev;
               if (win->cline > win->top_line + window->ruler)
                  win->cline--;
               win->rcol = rcol;
            }
            check_virtual_col( win, win->rcol, win->ccol );
            if (dirty == GLOBAL || file->dirty == LOCAL || wordwrap)
               file->dirty = GLOBAL;
            else
               file->dirty = dirty;
         }
      } else {
         if (new_node != NULL)
            my_free( new_node );
      }
   } else {
      if (new_node != NULL)
         my_free( new_node );
      error( WARNING, window->bottom_line, main4 );
   }

  
   win->visible = TRUE;
   if (rc == OK) {
      if (file->dirty != GLOBAL)
         my_scroll_down( win );
      restore_marked_block( win, 1 );
      show_size( win );
      show_avail_mem( );
      if (old_bcol != win->bcol) {
         make_ruler( win );
         show_ruler( win );
      }
   }
   return( rc );
}



int  insert_overwrite( WINDOW *window )
{
char *source;           
char *dest;             
int  len;               
int  pad;               
int  add;               
register int rcol;
register WINDOW *win;  
int  rc;

   win = window;
   if (win->ll->len == EOF || g_status.key_pressed >= 256)
      rc = OK;
   else {
      rcol = win->rcol;
     
      if (rcol >= g_display.line_length) {
        
         error( WARNING, win->bottom_line, ed2 );
         rc = ERROR;
      } else {
         copy_line( win->ll );
         detab_linebuff( );

         len = g_status.line_buff_len;
         pad = rcol > len ? rcol - len : 0;

         if (mode.insert || rcol >= len)
          
            add = 1;
         else
           
            add = 0;

        
         if (len + pad + add >= g_display.line_length) {
           
            error( WARNING, win->bottom_line, ed3 );
            rc = ERROR;
         } else {

           
            if (pad > 0  || add > 0) {
               source = g_status.line_buff + rcol - pad;
               dest = source + pad + add;

               assert( len + pad - rcol >= 0 );
               assert( len + pad - rcol < MAX_LINE_LENGTH );

               memmove( dest, source, len + pad - rcol );

              

               assert( pad >= 0 );
               assert( pad < MAX_LINE_LENGTH );

               memset( source, ' ', pad );
            }
            g_status.line_buff[rcol] = (char)g_status.key_pressed;
            g_status.line_buff_len += pad + add;
            entab_linebuff( );

            
            win->file_info->dirty = NOT_LOCAL;
            win->ll->dirty = TRUE;
            show_changed_line( win );
            if (win->ccol < win->end_col) {
               show_curl_line( win );
               show_ruler_char( win );
               win->ccol++;
            } else {
               win->bcol++;
               win->file_info->dirty = LOCAL;
               make_ruler( win );
               show_ruler( win );
            }
            rcol++;
         }

        
         check_virtual_col( win, rcol, win->ccol );
         win->file_info->modified = TRUE;
         if (mode.word_wrap) {
            add = mode.right_justify;
            mode.right_justify = FALSE;
            g_status.command = FormatText;
            word_wrap( win );
            mode.right_justify = add;
         }
         rc = OK;
      }
   }
   return( rc );
}



int  join_line( WINDOW *window )
{
int  len;               
int  new_len;           
int  next_len;          
text_ptr q;             
text_ptr tab_free;      
int  pad;               
register WINDOW *win;   
WINDOW *wp;
line_list_ptr next_node;
int  rc;

   win = window;
   if (win->ll->len == EOF  ||  win->ll->next->len == EOF)
      return( ERROR );

   rc = OK;

   assert( win->ll->next != NULL );

   next_node = win->ll->next;
   load_undo_buffer( win->file_info, win->ll->line, win->ll->len );
   copy_line( win->ll );
   detab_linebuff( );

  
   if (win->rcol < (len = g_status.line_buff_len))
      len = win->rcol;

  
   pad = win->rcol > len ? win->rcol - len : 0;

   assert( pad >= 0 );
   assert( pad < MAX_LINE_LENGTH );

  
   next_len = next_node->len;
   tab_free = detab_a_line( next_node->line, &next_len );

   assert( next_len >= 0 );
   assert( next_len < MAX_LINE_LENGTH );
   assert( len >= 0 );
   assert( len < MAX_LINE_LENGTH );

 
   new_len = len + pad + next_len;
   if (new_len >= g_display.line_length) {
     
      error( WARNING, win->bottom_line, ed4 );
      rc = ERROR;
   } else {
      if (mode.do_backups == TRUE) {
         win->file_info->modified = TRUE;
         rc = backup_file( win );
      }
      q = (text_ptr)(g_status.line_buff + len);
   
      if (pad > 0) {
         while (pad--)
            *q++ = ' ';
      }
      _fmemcpy( q, tab_free, next_len );
      g_status.line_buff_len = new_len;
      entab_linebuff( );

      if ((rc = un_copy_line( win->ll, win, FALSE )) == OK) {

         if (next_node->next != NULL)
            next_node->next->prev = win->ll;
         win->ll->next = next_node->next;
         win->ll->dirty = TRUE;

         --win->file_info->length;
         ++win->rline;
         adjust_windows_cursor( win, -1 );
         restore_marked_block( win, -1 );
         --win->rline;

         wp = g_status.window_list;
         while (wp != NULL) {
            if (wp->file_info == win->file_info) {
            
               if (wp != win) {
                  if (wp->ll == next_node)
                     wp->ll = win->ll->next;
               }
            }
            wp = wp->next;
         }

       
         if (next_node->line != NULL)
            my_free( next_node->line );
         my_free( next_node );

         show_size( win );
         show_avail_mem( );
         win->file_info->dirty = GLOBAL;
      }
   }
   return( rc );
}



int  word_delete( WINDOW *window )
{
int  len;               
int  count;             
register int start;     
char *source;           
char *dest;             
text_ptr p;
register WINDOW *win;