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#ifndef lint
static char SccsId[] = "%W% %G%";
#endif
/* Module: editline.c (Editor Line)
* Purpose: Manipulate the popup editor character string
* Subroutine: insert_chars() returns: void
* Subroutine: delete_chars_backward() returns: void
* Subroutine: delete_chars_forward() returns: void
* Subroutine: next_word_end() returns: int
* Subroutine: last_word_end() returns: int
* Copyright: 1989 Smithsonian Astrophysical Observatory
* You may do anything you like with this file except remove
* this copyright. The Smithsonian Astrophysical Observatory
* makes no representations about the suitability of this
* software for any purpose. It is provided "as is" without
* express or implied warranty.
* Modified: {0} Michael VanHilst initial version 4 July 1989
* {n} <who> -- <does what> -- <when>
*/
#include <stdio.h>
#include <X11/Xlib.h>
#include "hfiles/edit.h"
/*
* Subroutine: insert_chars
* Purpose: Insert new characters into the edit line
* Returns: Number of characters inserted
*/
void insert_chars ( edit, str, len )
EditStruct *edit;
char *str;
int len;
{
int i, j;
void redraw_after_insert();
/* check for end of buffer */
if( (edit->char_cnt + len) > edit->max_char_cnt ) {
(void)fprintf(stderr, "Line buffer full!\n");
if( edit->char_cnt < edit->max_char_cnt ) {
len = edit->max_char_cnt - edit->char_cnt;
} else
return;
}
/* move later characters forward */
for( i = edit->char_cnt, j = i + len;
i >= edit->active_position; i--, j-- ) {
edit->charsz[j] = edit->charsz[i];
edit->string[j] = edit->string[i];
}
/* insert new characters */
for( j = 0, ++i; j < len; j++, i++ ) {
edit->string[i] = str[j];
edit->charsz[i] = XTextWidth(edit->fontstruct, &str[j], 1);
edit->pixlen[i+1] = edit->pixlen[i] + edit->charsz[i];
}
edit->char_cnt += len;
edit->active_position += len;
/* update running lengths */
for( i--; i <= edit->char_cnt; i++ )
edit->pixlen[i+1] = edit->pixlen[i] + edit->charsz[i];
redraw_after_insert(edit, len);
}
/*
* Subroutine: delete_chars_backward
* Purpose: Delete characters before the active position
*/
void delete_chars_backward ( edit, len )
EditStruct *edit;
int len;
{
int i, j;
void redraw_after_delete();
/* delete before beginning of line? */
if( len > edit->active_position ) {
(void)fprintf(stderr, "Beginning of line!\n");
if( edit->active_position > 0 )
len = edit->active_position;
else
return;
}
/* move later characters backward */
for( i = edit->active_position, j = i - len;
i <= edit->char_cnt; i++, j++ ) {
edit->charsz[j] = edit->charsz[i];
edit->string[j] = edit->string[i];
}
edit->char_cnt -= len;
edit->active_position -= len;
/* update running lengths */
for( i=edit->active_position; i<=edit->char_cnt; i++ )
edit->pixlen[i+1] = edit->pixlen[i] + edit->charsz[i];
redraw_after_delete(edit);
}
/*
* Subroutine: delete_chars_forward
* Purpose: Delete characters from the active position forward
*/
void delete_chars_forward ( edit, len )
EditStruct *edit;
int len;
{
int i, j;
void redraw_after_delete();
/* delete beyond end of line? */
if( (edit->active_position + len) > edit->char_cnt ) {
if( edit->active_position < edit->char_cnt )
len = edit->char_cnt - edit->active_position;
else
return;
}
/* move later characters backward */
for( j = edit->active_position, i = j + len;
i <= edit->char_cnt; i++, j++ ) {
edit->charsz[j] = edit->charsz[i];
edit->string[j] = edit->string[i];
}
edit->char_cnt -= len;
/* update running lengths */
for( i=edit->active_position; i<=edit->char_cnt; i++ )
edit->pixlen[i+1] = edit->pixlen[i] + edit->charsz[i];
redraw_after_delete(edit);
}
/*
* Subroutine: next_word_end
* Returns: The distance from the active position to the next space
* following a character (or the end of the line)
*/
int next_word_end ( edit )
EditStruct *edit;
{
int i;
for( i=edit->active_position;
(i < edit->char_cnt) && ((edit->string[i] == ' ') ||
(edit->string[i] == '/') ||
(edit->string[i] == ',') ||
(edit->string[i] == '.') ||
(edit->string[i] == ';') ||
(edit->string[i] == ':')); i++ );
/* string[char_cnt]==' ', so loop will stop there, if nowhere else */
if( i < edit->char_cnt ) {
while( (edit->string[i] != ' ') && (edit->string[i] != '/') &&
(edit->string[i] != ',') && (edit->string[i] != '.') &&
(edit->string[i] != ';') && (edit->string[i] != ':') )
i++;
}
return( i - edit->active_position );
}
/*
* Subroutine: last_word_start
* Returns: The distance from the active position to the first character
* following a space found in a backward search (or the start of
* the line)
*/
int last_word_start ( edit )
EditStruct *edit;
{
int i;
if( edit->active_position == 0 )
return( 0 );
for( i = edit->active_position - 1;
(i >= 0) && ((edit->string[i] == ' ') || (edit->string[i] == '/') ||
(edit->string[i] == ',') || (edit->string[i] == '.') ||
(edit->string[i] == ';') || (edit->string[i] == ':'));
i-- );
if( i >= 0 ) {
while( (i >= 0) &&
((edit->string[i] != ' ') && (edit->string[i] != '/') &&
(edit->string[i] != ',') && (edit->string[i] != '.') &&
(edit->string[i] != ';') && (edit->string[i] != ':')) )
i--;
}
return( (i+1) - edit->active_position );
}
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