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NetBSD/lib/libform/internals.c

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/* $NetBSD: internals.c,v 1.29 2003/03/09 00:57:18 lukem Exp $ */
/*-
* Copyright (c) 1998-1999 Brett Lymn
* (blymn@baea.com.au, brett_lymn@yahoo.com.au)
* All rights reserved.
*
* This code has been donated to The NetBSD Foundation by the Author.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: internals.c,v 1.29 2003/03/09 00:57:18 lukem Exp $");
#include <limits.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <assert.h>
#include "internals.h"
#include "form.h"
#ifdef DEBUG
/*
* file handle to write debug info to, this will be initialised when
* the form is first posted.
*/
FILE *dbg = NULL;
/*
* map the request numbers to strings for debug
*/
char *reqs[] = {
"NEXT_PAGE", "PREV_PAGE", "FIRST_PAGE", "LAST_PAGE", "NEXT_FIELD",
"PREV_FIELD", "FIRST_FIELD", "LAST_FIELD", "SNEXT_FIELD",
"SPREV_FIELD", "SFIRST_FIELD", "SLAST_FIELD", "LEFT_FIELD",
"RIGHT_FIELD", "UP_FIELD", "DOWN_FIELD", "NEXT_CHAR", "PREV_CHAR",
"NEXT_LINE", "PREV_LINE", "NEXT_WORD", "PREV_WORD", "BEG_FIELD",
"END_FIELD", "BEG_LINE", "END_LINE", "LEFT_CHAR", "RIGHT_CHAR",
"UP_CHAR", "DOWN_CHAR", "NEW_LINE", "INS_CHAR", "INS_LINE",
"DEL_CHAR", "DEL_PREV", "DEL_LINE", "DEL_WORD", "CLR_EOL",
"CLR_EOF", "CLR_FIELD", "OVL_MODE", "INS_MODE", "SCR_FLINE",
"SCR_BLINE", "SCR_FPAGE", "SCR_BPAGE", "SCR_FHPAGE", "SCR_BHPAGE",
"SCR_FCHAR", "SCR_BCHAR", "SCR_HFLINE", "SCR_HBLINE", "SCR_HFHALF",
"SCR_HBHALF", "VALIDATION", "PREV_CHOICE", "NEXT_CHOICE" };
#endif
/* define our own min function - this is not generic but will do here
* (don't believe me? think about what value you would get
* from min(x++, y++)
*/
#define min(a,b) (((a) > (b))? (b) : (a))
/* for the line joining function... */
#define JOIN_NEXT 1
#define JOIN_NEXT_NW 2 /* next join, don't wrap the joined line */
#define JOIN_PREV 3
#define JOIN_PREV_NW 4 /* previous join, don't wrap the joined line */
/* for the bump_lines function... */
#define _FORMI_USE_CURRENT -1 /* indicates current cursor pos to be used */
static void
_formi_do_char_validation(FIELD *field, FIELDTYPE *type, char c, int *ret_val);
static void
_formi_do_validation(FIELD *field, FIELDTYPE *type, int *ret_val);
static int
_formi_join_line(FIELD *field, unsigned int pos, int direction);
void
_formi_hscroll_back(FIELD *field, unsigned int amt);
void
_formi_hscroll_fwd(FIELD *field, unsigned int amt);
static void
_formi_scroll_back(FIELD *field, unsigned int amt);
static void
_formi_scroll_fwd(FIELD *field, unsigned int amt);
static int
_formi_set_cursor_xpos(FIELD *field, int no_scroll);
static int
find_sow(char *str, unsigned int offset);
static int
find_cur_line(FIELD *cur, unsigned pos);
static int
split_line(FIELD *field, unsigned pos);
static void
bump_lines(FIELD *field, int pos, int amt, bool do_len);
static bool
check_field_size(FIELD *field);
static int
add_tab(FORM *form, FIELD *field, unsigned row, unsigned int i, char c);
static int
tab_size(FIELD *field, unsigned int offset, unsigned int i);
static unsigned int
tab_fit_len(FIELD *field, unsigned int row, unsigned int len);
static int
tab_fit_window(FIELD *field, unsigned int pos, unsigned int window);
/*
* Initialise the row offset for a field, depending on the type of
* field it is and the type of justification used. The justification
* is only used on static single line fields, everything else will
* have the cursor_xpos set to 0.
*/
void
_formi_init_field_xpos(FIELD *field)
{
/* not static or is multi-line which are not justified, so 0 it is */
if (((field->opts & O_STATIC) != O_STATIC) ||
((field->rows + field->nrows) != 1)) {
field->cursor_xpos = 0;
return;
}
switch (field->justification) {
case JUSTIFY_RIGHT:
field->cursor_xpos = field->cols - 1;
break;
case JUSTIFY_CENTER:
field->cursor_xpos = (field->cols - 1) / 2;
break;
default: /* assume left justify */
field->cursor_xpos = 0;
break;
}
}
/*
* Open the debug file if it is not already open....
*/
#ifdef DEBUG
int
_formi_create_dbg_file(void)
{
if (dbg == NULL) {
dbg = fopen("___form_dbg.out", "w");
if (dbg == NULL) {
fprintf(stderr, "Cannot open debug file!\n");
return E_SYSTEM_ERROR;
}
}
return E_OK;
}
#endif
/*
* Bump the lines array elements in the given field by the given amount.
* The row to start acting on can either be inferred from the given position
* or if the special value _FORMI_USE_CURRENT is set then the row will be
* the row the cursor is currently on.
*/
static void
bump_lines(FIELD *field, int pos, int amt, bool do_len)
{
int i, row, old_len;
#ifdef DEBUG
int dbg_ok = FALSE;
#endif
if (pos == _FORMI_USE_CURRENT)
row = field->start_line + field->cursor_ypos;
else
row = find_cur_line(field, (unsigned) pos);
#ifdef DEBUG
if (_formi_create_dbg_file() == E_OK) {
dbg_ok = TRUE;
fprintf(dbg, "bump_lines: bump starting at row %d\n", row);
fprintf(dbg,
"bump_lines: len from %d to %d, end from %d to %d\n",
field->lines[row].length,
field->lines[row].length + amt,
field->lines[row].end, field->lines[row].end + amt);
}
#endif
if (((int)field->lines[row].length + amt) < 0) {
field->lines[row].length = 0;
old_len = 0;
} else {
old_len = field->lines[row].length;
if (do_len == TRUE) {
field->lines[row].length =
_formi_tab_expanded_length(
&field->buffers[0].string[
field->lines[row].start], 0,
field->lines[row].end + amt
-field->lines[row].start);
}
}
if (old_len > 0) {
if ((amt < 0) && (- amt > field->lines[row].end))
field->lines[row].end = field->lines[row].start;
else
field->lines[row].end += amt;
} else
field->lines[row].end = field->lines[row].start;
#ifdef DEBUG
if (dbg_ok)
fprintf(dbg, "bump_lines: expanded length %d\n",
field->lines[row].length);
#endif
for (i = row + 1; i < field->row_count; i++) {
#ifdef DEBUG
if (dbg_ok) {
fprintf(dbg,
"bump_lines: row %d: len from %d to %d, end from %d to %d\n",
i, field->lines[i].start,
field->lines[i].start + amt,
field->lines[i].end,
field->lines[i].end + amt);
}
fflush(dbg);
#endif
field->lines[i].start += amt;
field->lines[i].end += amt;
field->lines[i].length = _formi_tab_expanded_length(
&field->buffers[0].string[field->lines[i].start],
0, field->lines[i].end - field->lines[i].start);
#ifdef DEBUG
if (dbg_ok) {
fprintf(dbg,
"bump_lines: row %d, expanded length %d\n",
i, field->lines[i].length);
}
#endif
}
}
/*
* Check the sizing of the field, if the maximum size is set for a
* dynamic field then check that the number of rows or columns does
* not exceed the set maximum. The decision to check the rows or
* columns is made on the basis of how many rows are in the field -
* one row means the max applies to the number of columns otherwise it
* applies to the number of rows. If the row/column count is less
* than the maximum then return TRUE.
*
*/
static bool
check_field_size(FIELD *field)
{
if ((field->opts & O_STATIC) != O_STATIC) {
/* dynamic field */
if (field->max == 0) /* unlimited */
return TRUE;
if (field->rows == 1) {
return (field->buffers[0].length < field->max);
} else {
return (field->row_count <= field->max);
}
} else {
if ((field->rows + field->nrows) == 1) {
return (field->buffers[0].length <= field->cols);
} else {
return (field->row_count <= (field->rows
+ field->nrows));
}
}
}
/*
* Set the form's current field to the first valid field on the page.
* Assume the fields have been sorted and stitched.
*/
int
_formi_pos_first_field(FORM *form)
{
FIELD *cur;
int old_page;
old_page = form->page;
/* scan forward for an active page....*/
while (form->page_starts[form->page].in_use == 0) {
form->page++;
if (form->page > form->max_page) {
form->page = old_page;
return E_REQUEST_DENIED;
}
}
/* then scan for a field we can use */
cur = form->fields[form->page_starts[form->page].first];
while ((cur->opts & (O_VISIBLE | O_ACTIVE))
!= (O_VISIBLE | O_ACTIVE)) {
cur = CIRCLEQ_NEXT(cur, glue);
if (cur == (void *) &form->sorted_fields) {
form->page = old_page;
return E_REQUEST_DENIED;
}
}
form->cur_field = cur->index;
return E_OK;
}
/*
* Set the field to the next active and visible field, the fields are
* traversed in index order in the direction given. If the parameter
* use_sorted is TRUE then the sorted field list will be traversed instead
* of using the field index.
*/
int
_formi_pos_new_field(FORM *form, unsigned direction, unsigned use_sorted)
{
FIELD *cur;
int i;
i = form->cur_field;
cur = form->fields[i];
do {
if (direction == _FORMI_FORWARD) {
if (use_sorted == TRUE) {
if ((form->wrap == FALSE) &&
(cur == CIRCLEQ_LAST(&form->sorted_fields)))
return E_REQUEST_DENIED;
cur = CIRCLEQ_NEXT(cur, glue);
i = cur->index;
} else {
if ((form->wrap == FALSE) &&
((i + 1) >= form->field_count))
return E_REQUEST_DENIED;
i++;
if (i >= form->field_count)
i = 0;
}
} else {
if (use_sorted == TRUE) {
if ((form->wrap == FALSE) &&
(cur == CIRCLEQ_FIRST(&form->sorted_fields)))
return E_REQUEST_DENIED;
cur = CIRCLEQ_PREV(cur, glue);
i = cur->index;
} else {
if ((form->wrap == FALSE) && (i <= 0))
return E_REQUEST_DENIED;
i--;
if (i < 0)
i = form->field_count - 1;
}
}
if ((form->fields[i]->opts & (O_VISIBLE | O_ACTIVE))
== (O_VISIBLE | O_ACTIVE)) {
form->cur_field = i;
return E_OK;
}
}
while (i != form->cur_field);
return E_REQUEST_DENIED;
}
/*
* Find the line in a field that the cursor is currently on.
*/
static int
find_cur_line(FIELD *cur, unsigned pos)
{
unsigned row;
/* if there is only one row then that must be it */
if (cur->row_count == 1)
return 0;
/* first check if pos is at the end of the string, if this
* is true then just return the last row since the pos may
* not have been added to the lines array yet.
*/
if (pos == (cur->buffers[0].length - 1))
return (cur->row_count - 1);
for (row = 0; row < cur->row_count; row++) {
if ((pos >= cur->lines[row].start)
&& (pos <= cur->lines[row].end))
return row;
}
#ifdef DEBUG
/* barf if we get here, this should not be possible */
assert((row != row));
#endif
return 0;
}
/*
* Word wrap the contents of the field's buffer 0 if this is allowed.
* If the wrap is successful, that is, the row count nor the buffer
* size is exceeded then the function will return E_OK, otherwise it
* will return E_REQUEST_DENIED.
*/
int
_formi_wrap_field(FIELD *field, unsigned int loc)
{
char *str;
int width, row, start_row;
unsigned int pos;
str = field->buffers[0].string;
if ((field->opts & O_STATIC) == O_STATIC) {
if ((field->rows + field->nrows) == 1) {
return E_OK; /* cannot wrap a single line */
}
width = field->cols;
} else {
/* if we are limited to one line then don't try to wrap */
if ((field->drows + field->nrows) == 1) {
return E_OK;
}
/*
* hueristic - if a dynamic field has more than one line
* on the screen then the field grows rows, otherwise
* it grows columns, effectively a single line field.
* This is documented AT&T behaviour.
*/
if (field->rows > 1) {
width = field->cols;
} else {
return E_OK;
}
}
start_row = find_cur_line(field, loc);
/* if we are not at the top of the field then back up one
* row because we may be able to merge the current row into
* the one above.
*/
if (start_row > 0)
start_row--;
for (row = start_row; row < field->row_count; row++) {
AGAIN:
pos = field->lines[row].end;
if (field->lines[row].length < width) {
/* line may be too short, try joining some lines */
if ((((int) field->row_count) - 1) == row) {
/* if this is the last row then don't
* wrap
*/
continue;
}
if (_formi_join_line(field, (unsigned int) pos,
JOIN_NEXT_NW) == E_OK) {
goto AGAIN;
} else
break;
} else {
/* line is too long, split it - maybe */
/* first check if we have not run out of room */
if ((field->opts & O_STATIC) == O_STATIC) {
/* check static field */
if ((field->rows + field->nrows - 1) == row)
return E_REQUEST_DENIED;
} else {
/* check dynamic field */
if ((field->max != 0)
&& ((field->max - 1) == row))
return E_REQUEST_DENIED;
}
/*
* split on first whitespace before current word
* if the line has tabs we need to work out where
* the field border lies when the tabs are expanded.
*/
if (field->lines[row].tabs == NULL) {
pos = width + field->lines[row].start - 1;
if (pos >= field->buffers[0].length)
pos = field->buffers[0].length - 1;
} else {
pos = tab_fit_len(field, (unsigned) row,
field->cols);
}
if ((!isblank(str[pos])) &&
((field->opts & O_WRAP) == O_WRAP)) {
if (!isblank(str[pos - 1]))
pos = find_sow(str,
(unsigned int) pos);
/*
* If we cannot split the line then return
* NO_ROOM so the driver can tell that it
* should not autoskip (if that is enabled)
*/
if ((pos == 0) || (!isblank(str[pos - 1]))
|| ((pos <= field->lines[row].start)
&& (field->buffers[0].length
>= (width - 1
+ field->lines[row].start)))) {
return E_NO_ROOM;
}
}
/* if we are at the end of the string and it has
* a trailing blank, don't wrap the blank.
*/
if ((pos == field->buffers[0].length - 1) &&
(isblank(str[pos])) &&
field->lines[row].length <= field->cols)
continue;
/*
* otherwise, if we are still sitting on a
* blank but not at the end of the line
* move forward one char so the blank
* is on the line boundary.
*/
if ((isblank(str[pos])) &&
(pos != field->buffers[0].length - 1))
pos++;
if (split_line(field, pos) != E_OK) {
return E_REQUEST_DENIED;
}
}
}
return E_OK;
}
/*
* Join the two lines that surround the location pos, the type
* variable indicates the direction of the join, JOIN_NEXT will join
* the next line to the current line, JOIN_PREV will join the current
* line to the previous line, the new lines will be wrapped unless the
* _NW versions of the directions are used. Returns E_OK if the join
* was successful or E_REQUEST_DENIED if the join cannot happen.
*/
static int
_formi_join_line(FIELD *field, unsigned int pos, int direction)
{
unsigned int row, i;
int old_alloced, old_row_count;
struct _formi_field_lines *saved;
#ifdef DEBUG
int dbg_ok = FALSE;
if (_formi_create_dbg_file() == E_OK) {
dbg_ok = TRUE;
}
#endif
if ((saved = (struct _formi_field_lines *)
malloc(field->lines_alloced * sizeof(struct _formi_field_lines)))
== NULL)
return E_REQUEST_DENIED;
bcopy(field->lines, saved,
field->row_count * sizeof(struct _formi_field_lines));
old_alloced = field->lines_alloced;
old_row_count = field->row_count;
row = find_cur_line(field, pos);
#ifdef DEBUG
if (dbg_ok == TRUE) {
fprintf(dbg, "join_line: working on row %d, row_count = %d\n",
row, field->row_count);
}
#endif
if ((direction == JOIN_NEXT) || (direction == JOIN_NEXT_NW)) {
/* see if there is another line following... */
if (row == (field->row_count - 1)) {
free(saved);
return E_REQUEST_DENIED;
}
#ifdef DEBUG
if (dbg_ok == TRUE) {
fprintf(dbg,
"join_line: join_next before end = %d, length = %d",
field->lines[row].end,
field->lines[row].length);
fprintf(dbg,
" :: next row end = %d, length = %d\n",
field->lines[row + 1].end,
field->lines[row + 1].length);
}
#endif
field->lines[row].end = field->lines[row + 1].end;
field->lines[row].length =
_formi_tab_expanded_length(field->buffers[0].string,
field->lines[row].start,
field->lines[row].end);
_formi_calculate_tabs(field, row);
/* shift all the remaining lines up.... */
for (i = row + 2; i < field->row_count; i++)
field->lines[i - 1] = field->lines[i];
} else {
if ((pos == 0) || (row == 0)) {
free(saved);
return E_REQUEST_DENIED;
}
#ifdef DEBUG
if (dbg_ok == TRUE) {
fprintf(dbg,
"join_line: join_prev before end = %d, length = %d",
field->lines[row].end,
field->lines[row].length);
fprintf(dbg,
" :: prev row end = %d, length = %d\n",
field->lines[row - 1].end,
field->lines[row - 1].length);
}
#endif
field->lines[row - 1].end = field->lines[row].end;
field->lines[row - 1].length =
_formi_tab_expanded_length(field->buffers[0].string,
field->lines[row - 1].start,
field->lines[row].end);
/* shift all the remaining lines up */
for (i = row + 1; i < field->row_count; i++)
field->lines[i - 1] = field->lines[i];
}
#ifdef DEBUG
if (dbg_ok == TRUE) {
fprintf(dbg,
"join_line: exit end = %d, length = %d\n",
field->lines[row].end, field->lines[row].length);
}
#endif
field->row_count--;
/* wrap the field if required, if this fails undo the change */
if ((direction == JOIN_NEXT) || (direction == JOIN_PREV)) {
if (_formi_wrap_field(field, (unsigned int) pos) != E_OK) {
free(field->lines);
field->lines = saved;
field->lines_alloced = old_alloced;
field->row_count = old_row_count;
for (i = 0; i < field->row_count; i++)
_formi_calculate_tabs(field, i);
return E_REQUEST_DENIED;
}
}
free(saved);
return E_OK;
}
/*
* Split the line at the given position, if possible
*/
static int
split_line(FIELD *field, unsigned pos)
{
struct _formi_field_lines *new_lines;
unsigned int row, i;
#ifdef DEBUG
short dbg_ok = FALSE;
#endif
if (pos == 0)
return E_REQUEST_DENIED;
#ifdef DEBUG
if (_formi_create_dbg_file() == E_OK) {
fprintf(dbg, "split_line: splitting line at %d\n", pos);
dbg_ok = TRUE;
}
#endif
if ((field->row_count + 1) > field->lines_alloced) {
if ((new_lines = (struct _formi_field_lines *)
realloc(field->lines, (field->row_count + 1)
* sizeof(struct _formi_field_lines))) == NULL)
return E_SYSTEM_ERROR;
field->lines = new_lines;
field->lines_alloced++;
}
row = find_cur_line(field, pos);
#ifdef DEBUG
if (dbg_ok == TRUE) {
fprintf(dbg,
"split_line: enter: lines[%d].end = %d, lines[%d].length = %d\n",
row, field->lines[row].end, row,
field->lines[row].length);
}
assert(((field->lines[row].end < INT_MAX) &&
(field->lines[row].length < INT_MAX) &&
(field->lines[row].length > 0)));
#endif
/* if asked to split right where the line already starts then
* just return - nothing to do.
*/
if (field->lines[row].start == pos)
return E_OK;
for (i = field->row_count - 1; i > row; i--) {
field->lines[i + 1] = field->lines[i];
}
field->lines[row + 1].end = field->lines[row].end;
field->lines[row].end = pos - 1;
field->lines[row].length =
_formi_tab_expanded_length(field->buffers[0].string,
field->lines[row].start,
field->lines[row].end);
_formi_calculate_tabs(field, row);
field->lines[row + 1].start = pos;
field->lines[row + 1].length =
_formi_tab_expanded_length(field->buffers[0].string,
field->lines[row + 1].start,
field->lines[row + 1].end);
field->lines[row + 1].tabs = NULL;
_formi_calculate_tabs(field, row + 1);
#ifdef DEBUG
assert(((field->lines[row + 1].end < INT_MAX) &&
(field->lines[row].end < INT_MAX) &&
(field->lines[row].length < INT_MAX) &&
(field->lines[row + 1].start < INT_MAX) &&
(field->lines[row + 1].length < INT_MAX) &&
(field->lines[row].length > 0) &&
(field->lines[row + 1].length > 0)));
if (dbg_ok == TRUE) {
fprintf(dbg,
"split_line: exit: lines[%d].end = %d, lines[%d].length = %d, ",
row, field->lines[row].end, row,
field->lines[row].length);
fprintf(dbg, "lines[%d].start = %d, lines[%d].end = %d, ",
row + 1, field->lines[row + 1].start, row + 1,
field->lines[row + 1].end);
fprintf(dbg, "lines[%d].length = %d, row_count = %d\n",
row + 1, field->lines[row + 1].length,
field->row_count + 1);
}
#endif
field->row_count++;
#ifdef DEBUG
if (dbg_ok == TRUE) {
bump_lines(field, 0, 0, FALSE); /* will report line data for us */
}
#endif
return E_OK;
}
/*
* skip the blanks in the given string, start at the index start and
* continue forward until either the end of the string or a non-blank
* character is found. Return the index of either the end of the string or
* the first non-blank character.
*/
unsigned
_formi_skip_blanks(char *string, unsigned int start)
{
unsigned int i;
i = start;
while ((string[i] != '\0') && isblank(string[i]))
i++;
return i;
}
/*
* Return the index of the top left most field of the two given fields.
*/
static int
_formi_top_left(FORM *form, int a, int b)
{
/* lower row numbers always win here.... */
if (form->fields[a]->form_row < form->fields[b]->form_row)
return a;
if (form->fields[a]->form_row > form->fields[b]->form_row)
return b;
/* rows must be equal, check columns */
if (form->fields[a]->form_col < form->fields[b]->form_col)
return a;
if (form->fields[a]->form_col > form->fields[b]->form_col)
return b;
/* if we get here fields must be in exactly the same place, punt */
return a;
}
/*
* Return the index to the field that is the bottom-right-most of the
* two given fields.
*/
static int
_formi_bottom_right(FORM *form, int a, int b)
{
/* check the rows first, biggest row wins */
if (form->fields[a]->form_row > form->fields[b]->form_row)
return a;
if (form->fields[a]->form_row < form->fields[b]->form_row)
return b;
/* rows must be equal, check cols, biggest wins */
if (form->fields[a]->form_col > form->fields[b]->form_col)
return a;
if (form->fields[a]->form_col < form->fields[b]->form_col)
return b;
/* fields in the same place, punt */
return a;
}
/*
* Find the end of the current word in the string str, starting at
* offset - the end includes any trailing whitespace. If the end of
* the string is found before a new word then just return the offset
* to the end of the string.
*/
static int
find_eow(char *str, unsigned int offset)
{
int start;
start = offset;
/* first skip any non-whitespace */
while ((str[start] != '\0') && !isblank(str[start]))
start++;
/* see if we hit the end of the string */
if (str[start] == '\0')
return start;
/* otherwise skip the whitespace.... */
while ((str[start] != '\0') && isblank(str[start]))
start++;
return start;
}
/*
* Find the beginning of the current word in the string str, starting
* at offset.
*/
static int
find_sow(char *str, unsigned int offset)
{
int start;
start = offset;
if (start > 0) {
if (isblank(str[start]) || isblank(str[start - 1])) {
if (isblank(str[start - 1]))
start--;
/* skip the whitespace.... */
while ((start >= 0) && isblank(str[start]))
start--;
}
}
/* see if we hit the start of the string */
if (start < 0)
return 0;
/* now skip any non-whitespace */
while ((start >= 0) && !isblank(str[start]))
start--;
if (start > 0)
start++; /* last loop has us pointing at a space, adjust */
if (start < 0)
start = 0;
return start;
}
/*
* Scroll the field forward the given number of lines.
*/
static void
_formi_scroll_fwd(FIELD *field, unsigned int amt)
{
/* check if we have lines to scroll */
if (field->row_count < (field->start_line + field->rows))
return;
field->start_line += min(amt,
field->row_count - field->start_line
- field->rows);
}
/*
* Scroll the field backward the given number of lines.
*/
static void
_formi_scroll_back(FIELD *field, unsigned int amt)
{
if (field->start_line == 0)
return;
field->start_line -= min(field->start_line, amt);
}
/*
* Scroll the field forward the given number of characters.
*/
void
_formi_hscroll_fwd(FIELD *field, int unsigned amt)
{
unsigned int row, end, scroll_amt, expanded;
_formi_tab_t *ts;
row = field->start_line + field->cursor_ypos;
if ((field->lines[row].tabs == NULL)
|| (field->lines[row].tabs->in_use == FALSE)) {
/* if the line has no tabs things are easy... */
end = field->start_char + field->cols + amt - 1;
scroll_amt = amt;
if (end > field->lines[row].end) {
end = field->lines[row].end;
scroll_amt = end - field->start_char - field->cols + 1;
}
} else {
/*
* If there are tabs we need to add on the scroll amount,
* find the last char position that will fit into
* the field and finally fix up the start_char. This
* is a lot of work but handling the case where there
* are not enough chars to scroll by amt is difficult.
*/
end = field->start_char + field->row_xpos + amt;
if (end >= field->buffers[0].length)
end = field->buffers[0].length - 1;
else {
expanded = _formi_tab_expanded_length(
field->buffers[0].string,
field->start_char + amt,
field->start_char + field->row_xpos + amt);
ts = field->lines[0].tabs;
/* skip tabs to the lhs of our starting point */
while ((ts != NULL) && (ts->in_use == TRUE)
&& (ts->pos < end))
ts = ts->fwd;
while ((expanded <= field->cols)
&& (end < field->buffers[0].length)) {
if (field->buffers[0].string[end] == '\t') {
#ifdef DEBUG
assert((ts != NULL)
&& (ts->in_use == TRUE));
#endif
if (ts->pos == end) {
if ((expanded + ts->size)
> field->cols)
break;
expanded += ts->size;
ts = ts->fwd;
}
#ifdef DEBUG
else
assert(ts->pos == end);
#endif
} else
expanded++;
end++;
}
}
scroll_amt = tab_fit_window(field, end, field->cols);
if (scroll_amt < field->start_char)
scroll_amt = 1;
else
scroll_amt -= field->start_char;
scroll_amt = min(scroll_amt, amt);
}
field->start_char += scroll_amt;
field->cursor_xpos =
_formi_tab_expanded_length(field->buffers[0].string,
field->start_char,
field->row_xpos
+ field->start_char) - 1;
}
/*
* Scroll the field backward the given number of characters.
*/
void
_formi_hscroll_back(FIELD *field, unsigned int amt)
{
field->start_char -= min(field->start_char, amt);
field->cursor_xpos =
_formi_tab_expanded_length(field->buffers[0].string,
field->start_char,
field->row_xpos
+ field->start_char) - 1;
if (field->cursor_xpos >= field->cols) {
field->row_xpos = 0;
field->cursor_xpos = 0;
}
}
/*
* Find the different pages in the form fields and assign the form
* page_starts array with the information to find them.
*/
int
_formi_find_pages(FORM *form)
{
int i, cur_page = 0;
if ((form->page_starts = (_FORMI_PAGE_START *)
malloc((form->max_page + 1) * sizeof(_FORMI_PAGE_START))) == NULL)
return E_SYSTEM_ERROR;
/* initialise the page starts array */
memset(form->page_starts, 0,
(form->max_page + 1) * sizeof(_FORMI_PAGE_START));
for (i =0; i < form->field_count; i++) {
if (form->fields[i]->page_break == 1)
cur_page++;
if (form->page_starts[cur_page].in_use == 0) {
form->page_starts[cur_page].in_use = 1;
form->page_starts[cur_page].first = i;
form->page_starts[cur_page].last = i;
form->page_starts[cur_page].top_left = i;
form->page_starts[cur_page].bottom_right = i;
} else {
form->page_starts[cur_page].last = i;
form->page_starts[cur_page].top_left =
_formi_top_left(form,
form->page_starts[cur_page].top_left,
i);
form->page_starts[cur_page].bottom_right =
_formi_bottom_right(form,
form->page_starts[cur_page].bottom_right,
i);
}
}
return E_OK;
}
/*
* Completely redraw the field of the given form.
*/
void
_formi_redraw_field(FORM *form, int field)
{
unsigned int pre, post, flen, slen, i, row, start;
unsigned int last_row, tab, cpos, len;
char *str, c;
FIELD *cur;
#ifdef DEBUG
char buffer[100];
#endif
cur = form->fields[field];
str = cur->buffers[0].string;
flen = cur->cols;
slen = 0;
start = 0;
if ((cur->row_count - cur->start_line) < cur->rows)
last_row = cur->row_count;
else
last_row = cur->start_line + cur->rows;
for (row = cur->start_line; row < last_row; row++) {
wmove(form->scrwin,
(int) (cur->form_row + row - cur->start_line),
(int) cur->form_col);
start = cur->lines[row].start;
if ((cur->rows + cur->nrows) == 1) {
if ((cur->start_char + cur->cols)
>= cur->buffers[0].length)
len = cur->buffers[0].length;
else
len = cur->cols + cur->start_char;
slen = _formi_tab_expanded_length(
cur->buffers[0].string, cur->start_char, len);
if (slen > cur->cols)
slen = cur->cols;
slen += cur->start_char;
} else
slen = cur->lines[row].length;
if ((cur->opts & O_STATIC) == O_STATIC) {
switch (cur->justification) {
case JUSTIFY_RIGHT:
post = 0;
if (flen < slen)
pre = 0;
else
pre = flen - slen;
break;
case JUSTIFY_CENTER:
if (flen < slen) {
pre = 0;
post = 0;
} else {
pre = flen - slen;
post = pre = pre / 2;
/* get padding right if
centring is not even */
if ((post + pre + slen) < flen)
post++;
}
break;
case NO_JUSTIFICATION:
case JUSTIFY_LEFT:
default:
pre = 0;
if (flen <= slen)
post = 0;
else {
post = flen - slen;
if (post > flen)
post = flen;
}
break;
}
} else {
/* dynamic fields are not justified */
pre = 0;
if (flen <= slen)
post = 0;
else {
post = flen - slen;
if (post > flen)
post = flen;
}
/* but they do scroll.... */
if (pre > cur->start_char - start)
pre = pre - cur->start_char + start;
else
pre = 0;
if (slen > cur->start_char) {
slen -= cur->start_char;
if (slen > flen)
post = 0;
else
post = flen - slen;
if (post > flen)
post = flen;
} else {
slen = 0;
post = flen - pre;
}
}
if (form->cur_field == field)
wattrset(form->scrwin, cur->fore);
else
wattrset(form->scrwin, cur->back);
#ifdef DEBUG
if (_formi_create_dbg_file() == E_OK) {
fprintf(dbg,
"redraw_field: start=%d, pre=%d, slen=%d, flen=%d, post=%d, start_char=%d\n",
start, pre, slen, flen, post, cur->start_char);
if (str != NULL) {
strncpy(buffer,
&str[cur->start_char
+ cur->lines[row].start], flen);
} else {
strcpy(buffer, "(null)");
}
buffer[flen] = '\0';
fprintf(dbg, "redraw_field: %s\n", buffer);
}
#endif
for (i = start + cur->start_char; i < pre; i++)
waddch(form->scrwin, cur->pad);
#ifdef DEBUG
fprintf(dbg, "redraw_field: will add %d chars\n",
min(slen, flen));
#endif
str = &cur->buffers[0].string[cur->start_char
+ cur->lines[row].start];
for (i = 0, cpos = cur->start_char; i < min(slen, flen);
i++, str++, cpos++)
{
c = *str;
tab = 0; /* just to shut gcc up */
#ifdef DEBUG
fprintf(dbg, "adding char str[%d]=%c\n",
cpos + cur->start_char + cur->lines[row].start,
c);
#endif
if (((cur->opts & O_PUBLIC) != O_PUBLIC)) {
if (c == '\t')
tab = add_tab(form, cur, row,
cpos, cur->pad);
else
waddch(form->scrwin, cur->pad);
} else if ((cur->opts & O_VISIBLE) == O_VISIBLE) {
if (c == '\t')
tab = add_tab(form, cur, row, cpos,
' ');
else
waddch(form->scrwin, c);
} else {
if (c == '\t')
tab = add_tab(form, cur, row, cpos,
' ');
else
waddch(form->scrwin, ' ');
}
/*
* If we have had a tab then skip forward
* the requisite number of chars to keep
* things in sync.
*/
if (c == '\t')
i += tab - 1;
}
for (i = 0; i < post; i++)
waddch(form->scrwin, cur->pad);
}
for (row = cur->row_count - cur->start_line; row < cur->rows; row++) {
wmove(form->scrwin, (int) (cur->form_row + row),
(int) cur->form_col);
if (form->cur_field == field)
wattrset(form->scrwin, cur->fore);
else
wattrset(form->scrwin, cur->back);
for (i = 0; i < cur->cols; i++) {
waddch(form->scrwin, cur->pad);
}
}
wattrset(form->scrwin, cur->back);
return;
}
/*
* Add the correct number of the given character to simulate a tab
* in the field.
*/
static int
add_tab(FORM *form, FIELD *field, unsigned row, unsigned int i, char c)
{
int j;
_formi_tab_t *ts = field->lines[row].tabs;
while ((ts != NULL) && (ts->pos != i))
ts = ts->fwd;
#ifdef DEBUG
assert(ts != NULL);
#endif
for (j = 0; j < ts->size; j++)
waddch(form->scrwin, c);
return ts->size;
}
/*
* Display the fields attached to the form that are on the current page
* on the screen.
*
*/
int
_formi_draw_page(FORM *form)
{
int i;
if (form->page_starts[form->page].in_use == 0)
return E_BAD_ARGUMENT;
wclear(form->scrwin);
for (i = form->page_starts[form->page].first;
i <= form->page_starts[form->page].last; i++)
_formi_redraw_field(form, i);
return E_OK;
}
/*
* Add the character c at the position pos in buffer 0 of the given field
*/
int
_formi_add_char(FIELD *field, unsigned int pos, char c)
{
char *new, old_c;
unsigned int new_size;
int status;
/*
* If buffer has not had a string before, set it to a blank
* string. Everything should flow from there....
*/
if (field->buffers[0].string == NULL) {
set_field_buffer(field, 0, "");
}
if (_formi_validate_char(field, c) != E_OK) {
#ifdef DEBUG
fprintf(dbg, "add_char: char %c failed char validation\n", c);
#endif
return E_INVALID_FIELD;
}
if ((c == '\t') && (field->cols <= 8)) {
#ifdef DEBUG
fprintf(dbg, "add_char: field too small for a tab\n");
#endif
return E_NO_ROOM;
}
#ifdef DEBUG
fprintf(dbg, "add_char: pos=%d, char=%c\n", pos, c);
fprintf(dbg, "add_char enter: xpos=%d, row_pos=%d, start=%d\n",
field->cursor_xpos, field->row_xpos, field->start_char);
fprintf(dbg, "add_char enter: length=%d(%d), allocated=%d\n",
field->buffers[0].length, strlen(field->buffers[0].string),
field->buffers[0].allocated);
fprintf(dbg, "add_char enter: %s\n", field->buffers[0].string);
fprintf(dbg, "add_char enter: buf0_status=%d\n", field->buf0_status);
#endif
if (((field->opts & O_BLANK) == O_BLANK) &&
(field->buf0_status == FALSE) &&
((field->row_xpos + field->start_char) == 0)) {
field->buffers[0].length = 0;
field->buffers[0].string[0] = '\0';
pos = 0;
field->start_char = 0;
field->start_line = 0;
field->row_count = 1;
field->row_xpos = 0;
field->cursor_ypos = 0;
field->lines[0].start = 0;
field->lines[0].end = 0;
field->lines[0].length = 0;
_formi_init_field_xpos(field);
}
if ((field->overlay == 0)
|| ((field->overlay == 1) && (pos >= field->buffers[0].length))) {
/* first check if the field can have more chars...*/
if (check_field_size(field) == FALSE)
return E_REQUEST_DENIED;
if (field->buffers[0].length + 1
>= field->buffers[0].allocated) {
new_size = field->buffers[0].allocated + 64
- (field->buffers[0].allocated % 64);
if ((new = (char *) realloc(field->buffers[0].string,
new_size )) == NULL)
return E_SYSTEM_ERROR;
field->buffers[0].allocated = new_size;
field->buffers[0].string = new;
}
}
if ((field->overlay == 0) && (field->buffers[0].length > pos)) {
bcopy(&field->buffers[0].string[pos],
&field->buffers[0].string[pos + 1],
field->buffers[0].length - pos + 1);
}
old_c = field->buffers[0].string[pos];
field->buffers[0].string[pos] = c;
if (pos >= field->buffers[0].length) {
/* make sure the string is terminated if we are at the
* end of the string, the terminator would be missing
* if we are are at the end of the field.
*/
field->buffers[0].string[pos + 1] = '\0';
}
/* only increment the length if we are inserting characters
* OR if we are at the end of the field in overlay mode.
*/
if ((field->overlay == 0)
|| ((field->overlay == 1) && (pos >= field->buffers[0].length))) {
field->buffers[0].length++;
bump_lines(field, (int) pos, 1, TRUE);
} else if (field->overlay == 1)
bump_lines(field, (int) pos, 0, TRUE);
new_size = find_cur_line(field, pos);
_formi_calculate_tabs(field, new_size);
/* wrap the field, if needed */
status = _formi_wrap_field(field, pos);
/* just in case the row we are on wrapped */
new_size = find_cur_line(field, pos);
/*
* check the wrap worked or that we have not exceeded the
* max field size - this can happen if the field is re-wrapped
* and the row count is increased past the set limit.
*/
if ((status != E_OK) || (check_field_size(field) == FALSE)) {
if ((field->overlay == 0)
|| ((field->overlay == 1)
&& (pos >= field->buffers[0].length))) {
/*
* wrap failed for some reason, back out the
* char insert
*/
bcopy(&field->buffers[0].string[pos + 1],
&field->buffers[0].string[pos],
field->buffers[0].length - pos);
field->buffers[0].length--;
bump_lines(field, (int) pos, -1, TRUE);
if (pos > 0)
pos--;
} else if (field->overlay == 1) {
/* back out character overlay */
field->buffers[0].string[pos] = old_c;
}
new_size = find_cur_line(field, pos);
_formi_calculate_tabs(field, new_size);
_formi_wrap_field(field, pos);
/*
* If we are here then either the status is bad or we
* simply ran out of room. If the status is E_OK then
* we ran out of room, let the form driver know this.
*/
if (status == E_OK)
status = E_REQUEST_DENIED;
} else {
field->buf0_status = TRUE;
if ((field->rows + field->nrows) == 1) {
field->row_xpos++;
status = _formi_set_cursor_xpos(field, FALSE);
} else {
if (new_size >= field->rows) {
field->cursor_ypos = field->rows - 1;
field->start_line = field->row_count
- field->cursor_ypos - 1;
} else
field->cursor_ypos = new_size;
if ((field->lines[new_size].start) <= (pos + 1)) {
field->row_xpos = pos
- field->lines[new_size].start + 1;
field->cursor_xpos =
_formi_tab_expanded_length(
&field->buffers[0].string[
field->lines[new_size].start], 0,
field->row_xpos - 1);
} else {
field->row_xpos = 0;
field->cursor_xpos = 0;
}
/*
* Annoying corner case - if we are right in
* the bottom right corner of the field we
* need to scroll the field one line so the
* cursor is positioned correctly in the
* field.
*/
if ((field->cursor_xpos >= field->cols) &&
(field->cursor_ypos == (field->rows - 1))) {
field->cursor_ypos--;
field->start_line++;
}
}
}
#ifdef DEBUG
assert((field->cursor_xpos <= field->cols)
&& (field->cursor_ypos < 400000)
&& (field->start_line < 400000));
fprintf(dbg, "add_char exit: xpos=%d, row_pos=%d, start=%d\n",
field->cursor_xpos, field->row_xpos, field->start_char);
fprintf(dbg, "add_char_exit: length=%d(%d), allocated=%d\n",
field->buffers[0].length, strlen(field->buffers[0].string),
field->buffers[0].allocated);
fprintf(dbg, "add_char exit: ypos=%d, start_line=%d\n",
field->cursor_ypos, field->start_line);
fprintf(dbg,"add_char exit: %s\n", field->buffers[0].string);
fprintf(dbg, "add_char exit: buf0_status=%d\n", field->buf0_status);
fprintf(dbg, "add_char exit: status = %s\n",
(status == E_OK)? "OK" : "FAILED");
#endif
return status;
}
/*
* Set the position of the cursor on the screen in the row depending on
* where the current position in the string is and the justification
* that is to be applied to the field. Justification is only applied
* to single row, static fields.
*/
static int
_formi_set_cursor_xpos(FIELD *field, int noscroll)
{
int just, pos;
just = field->justification;
pos = field->start_char + field->row_xpos
+ field->lines[field->start_line + field->cursor_ypos].start;
#ifdef DEBUG
fprintf(dbg,
"cursor_xpos enter: pos %d, start_char %d, row_xpos %d, xpos %d\n",
pos, field->start_char, field->row_xpos, field->cursor_xpos);
#endif
/*
* make sure we apply the correct justification to non-static
* fields.
*/
if (((field->rows + field->nrows) != 1) ||
((field->opts & O_STATIC) != O_STATIC))
just = JUSTIFY_LEFT;
switch (just) {
case JUSTIFY_RIGHT:
field->cursor_xpos = field->cols - 1
- _formi_tab_expanded_length(
field->buffers[0].string, 0,
field->buffers[0].length - 1)
+ _formi_tab_expanded_length(
field->buffers[0].string, 0,
field->row_xpos);
break;
case JUSTIFY_CENTER:
field->cursor_xpos = ((field->cols - 1)
- _formi_tab_expanded_length(
field->buffers[0].string, 0,
field->buffers[0].length - 1) + 1) / 2
+ _formi_tab_expanded_length(field->buffers[0].string,
0, field->row_xpos);
if (field->cursor_xpos > (field->cols - 1))
field->cursor_xpos = (field->cols - 1);
break;
default:
field->cursor_xpos = _formi_tab_expanded_length(
field->buffers[0].string,
field->start_char,
field->row_xpos + field->start_char);
if ((field->cursor_xpos <= (field->cols - 1)) &&
((field->start_char + field->row_xpos)
< field->buffers[0].length))
field->cursor_xpos--;
if (field->cursor_xpos > (field->cols - 1)) {
if ((field->opts & O_STATIC) == O_STATIC) {
field->start_char = 0;
if (field->row_xpos
== (field->buffers[0].length - 1)) {
field->cursor_xpos = field->cols - 1;
} else {
field->cursor_xpos =
_formi_tab_expanded_length(
field->buffers[0].string,
field->start_char,
field->row_xpos
+ field->start_char
- 1) - 1;
}
} else {
if (noscroll == FALSE) {
field->start_char =
tab_fit_window(
field,
field->start_char
+ field->row_xpos,
field->cols);
field->row_xpos = pos
- field->start_char;
field->cursor_xpos =
_formi_tab_expanded_length(
field->buffers[0].string,
field->start_char,
field->row_xpos
+ field->start_char - 1);
} else {
field->cursor_xpos = (field->cols - 1);
}
}
}
break;
}
#ifdef DEBUG
fprintf(dbg,
"cursor_xpos exit: pos %d, start_char %d, row_xpos %d, xpos %d\n",
pos, field->start_char, field->row_xpos, field->cursor_xpos);
#endif
return E_OK;
}
/*
* Manipulate the text in a field, this takes the given form and performs
* the passed driver command on the current text field. Returns 1 if the
* text field was modified.
*/
int
_formi_manipulate_field(FORM *form, int c)
{
FIELD *cur;
char *str, saved;
unsigned int start, end, pos, row, status, old_count, size;
unsigned int old_xpos, old_row_pos;
int len;
cur = form->fields[form->cur_field];
if ((cur->buffers[0].string == NULL) || (cur->buffers[0].length == 0))
return E_REQUEST_DENIED;
#ifdef DEBUG
fprintf(dbg, "entry: request is REQ_%s\n", reqs[c - REQ_MIN_REQUEST]);
fprintf(dbg,
"entry: xpos=%d, row_pos=%d, start_char=%d, length=%d, allocated=%d\n",
cur->cursor_xpos, cur->row_xpos, cur->start_char,
cur->buffers[0].length, cur->buffers[0].allocated);
fprintf(dbg, "entry: start_line=%d, ypos=%d\n", cur->start_line,
cur->cursor_ypos);
fprintf(dbg, "entry: string=");
if (cur->buffers[0].string == NULL)
fprintf(dbg, "(null)\n");
else
fprintf(dbg, "\"%s\"\n", cur->buffers[0].string);
#endif
/* Cannot manipulate a null string! */
if (cur->buffers[0].string == NULL)
return E_REQUEST_DENIED;
row = cur->start_line + cur->cursor_ypos;
saved = cur->buffers[0].string[cur->start_char + cur->row_xpos
+ cur->lines[row].start];
switch (c) {
case REQ_RIGHT_CHAR:
/*
* The right_char request performs the same function
* as the next_char request except that the cursor is
* not wrapped if it is at the end of the line, so
* check if the cursor is at the end of the line and
* deny the request otherwise just fall through to
* the next_char request handler.
*/
if (cur->cursor_xpos >= cur->cols - 1)
return E_REQUEST_DENIED;
/* FALLTHRU */
case REQ_NEXT_CHAR:
/* for a dynamic field allow an offset of one more
* char so we can insert chars after end of string.
* Static fields cannot do this so deny request if
* cursor is at the end of the field.
*/
if (((cur->opts & O_STATIC) == O_STATIC) &&
(cur->row_xpos == cur->cols - 1) &&
((cur->rows + cur->nrows) == 1))
return E_REQUEST_DENIED;
if ((cur->row_xpos + cur->start_char + 1)
> cur->buffers[0].length)
return E_REQUEST_DENIED;
if ((cur->rows + cur->nrows) == 1) {
cur->row_xpos++;
_formi_set_cursor_xpos(cur, (c == REQ_RIGHT_CHAR));
} else {
if (cur->cursor_xpos >= (cur->lines[row].length - 1)) {
if (((row + 1) >= cur->row_count) ||
(c == REQ_RIGHT_CHAR))
return E_REQUEST_DENIED;
cur->cursor_xpos = 0;
cur->row_xpos = 0;
if (cur->cursor_ypos == (cur->rows - 1))
cur->start_line++;
else
cur->cursor_ypos++;
} else {
old_xpos = cur->cursor_xpos;
old_row_pos = cur->row_xpos;
if (saved == '\t')
cur->cursor_xpos += tab_size(cur,
cur->lines[row].start,
cur->row_xpos);
else
cur->cursor_xpos++;
cur->row_xpos++;
if (cur->cursor_xpos
>= cur->lines[row].length) {
if (((row + 1) >= cur->row_count) ||
(c == REQ_RIGHT_CHAR)) {
cur->cursor_xpos = old_xpos;
cur->row_xpos = old_row_pos;
return E_REQUEST_DENIED;
}
cur->cursor_xpos = 0;
cur->row_xpos = 0;
if (cur->cursor_ypos
== (cur->rows - 1))
cur->start_line++;
else
cur->cursor_ypos++;
}
}
}
break;
case REQ_LEFT_CHAR:
/*
* The behaviour of left_char is the same as prev_char
* except that the cursor will not wrap if it has
* reached the LHS of the field, so just check this
* and fall through if we are not at the LHS.
*/
if (cur->cursor_xpos == 0)
return E_REQUEST_DENIED;
/* FALLTHRU */
case REQ_PREV_CHAR:
if ((cur->rows + cur->nrows) == 1) {
if (cur->row_xpos == 0) {
if (cur->start_char > 0)
cur->start_char--;
else
return E_REQUEST_DENIED;
} else {
cur->row_xpos--;
_formi_set_cursor_xpos(cur, FALSE);
}
} else {
if ((cur->cursor_xpos == 0) &&
(cur->cursor_ypos == 0) &&
(cur->start_line == 0))
return E_REQUEST_DENIED;
row = cur->start_line + cur->cursor_ypos;
pos = cur->lines[row].start + cur->row_xpos;
if ((pos >= cur->buffers[0].length) && (pos > 0))
pos--;
if (cur->cursor_xpos > 0) {
if (cur->buffers[0].string[pos] == '\t') {
size = tab_size(cur,
cur->lines[row].start,
pos
- cur->lines[row].start);
if (size > cur->cursor_xpos) {
cur->cursor_xpos = 0;
cur->row_xpos = 0;
} else {
cur->row_xpos--;
cur->cursor_xpos -= size;
}
} else {
cur->cursor_xpos--;
cur->row_xpos--;
}
} else {
if (cur->cursor_ypos > 0)
cur->cursor_ypos--;
else
cur->start_line--;
row = cur->start_line + cur->cursor_ypos;
cur->cursor_xpos = cur->lines[row].length - 1;
cur->row_xpos = cur->lines[row].end -
cur->lines[row].start;
}
}
break;
case REQ_DOWN_CHAR:
/*
* The down_char request has the same functionality as
* the next_line request excepting that the field is not
* scrolled if the cursor is at the bottom of the field.
* Check to see if the cursor is at the bottom of the field
* and if it is then deny the request otherwise fall
* through to the next_line handler.
*/
if (cur->cursor_ypos >= cur->rows - 1)
return E_REQUEST_DENIED;
/* FALLTHRU */
case REQ_NEXT_LINE:
if ((cur->start_line + cur->cursor_ypos + 1) >= cur->row_count)
return E_REQUEST_DENIED;
if ((cur->cursor_ypos + 1) >= cur->rows) {
cur->start_line++;
} else
cur->cursor_ypos++;
row = cur->cursor_ypos + cur->start_line;
cur->row_xpos = tab_fit_len(cur, row, cur->cursor_xpos)
- cur->lines[row].start;
cur->cursor_xpos =
_formi_tab_expanded_length(
&cur->buffers[0].string[cur->lines[row].start],
0, cur->row_xpos);
break;
case REQ_UP_CHAR:
/*
* The up_char request has the same functionality as
* the prev_line request excepting the field is not
* scrolled, check if the cursor is at the top of the
* field, if it is deny the request otherwise fall
* through to the prev_line handler.
*/
if (cur->cursor_ypos == 0)
return E_REQUEST_DENIED;
/* FALLTHRU */
case REQ_PREV_LINE:
if (cur->cursor_ypos == 0) {
if (cur->start_line == 0)
return E_REQUEST_DENIED;
cur->start_line--;
} else
cur->cursor_ypos--;
row = cur->cursor_ypos + cur->start_line;
cur->row_xpos = tab_fit_len(cur, row, cur->cursor_xpos + 1)
- cur->lines[row].start;
cur->cursor_xpos =
_formi_tab_expanded_length(
&cur->buffers[0].string[cur->lines[row].start],
0, cur->row_xpos) - 1;
break;
case REQ_NEXT_WORD:
start = cur->lines[cur->start_line + cur->cursor_ypos].start
+ cur->row_xpos + cur->start_char;
str = cur->buffers[0].string;
start = find_eow(str, start);
/* check if we hit the end */
if (str[start] == '\0')
return E_REQUEST_DENIED;
/* otherwise we must have found the start of a word...*/
if ((cur->rows + cur->nrows) == 1) {
/* single line field */
size = _formi_tab_expanded_length(str,
cur->start_char, start);
if (size < cur->cols) {
cur->row_xpos = start - cur->start_char;
} else {
cur->start_char = start;
cur->row_xpos = 0;
}
_formi_set_cursor_xpos(cur, FALSE);
} else {
/* multiline field */
row = find_cur_line(cur, start);
cur->row_xpos = start - cur->lines[row].start;
cur->cursor_xpos = _formi_tab_expanded_length(
&str[cur->lines[row].start],
0, cur->row_xpos) - 1;
if (row != (cur->start_line + cur->cursor_ypos)) {
if (cur->cursor_ypos == (cur->rows - 1)) {
cur->start_line = row - cur->rows + 1;
} else {
cur->cursor_ypos = row
- cur->start_line;
}
}
}
break;
case REQ_PREV_WORD:
start = cur->start_char + cur->row_xpos
+ cur->lines[cur->start_line + cur->cursor_ypos].start;
if (cur->start_char > 0)
start--;
if (start == 0)
return E_REQUEST_DENIED;
str = cur->buffers[0].string;
start = find_sow(str, start);
if ((cur->rows + cur->nrows) == 1) {
/* single line field */
size = _formi_tab_expanded_length(str,
cur->start_char, start);
if (start > cur->start_char) {
cur->row_xpos = start - cur->start_char;
} else {
cur->start_char = start;
cur->row_xpos = 0;
}
_formi_set_cursor_xpos(cur, FALSE);
} else {
/* multiline field */
row = find_cur_line(cur, start);
cur->row_xpos = start - cur->lines[row].start;
cur->cursor_xpos = _formi_tab_expanded_length(
&str[cur->lines[row].start], 0,
cur->row_xpos) - 1;
if (row != (cur->start_line + cur->cursor_ypos)) {
if (cur->cursor_ypos == 0) {
cur->start_line = row;
} else {
if (cur->start_line > row) {
cur->start_line = row;
cur->cursor_ypos = 0;
} else {
cur->cursor_ypos = row -
cur->start_line;
}
}
}
}
break;
case REQ_BEG_FIELD:
cur->start_char = 0;
cur->start_line = 0;
cur->row_xpos = 0;
_formi_init_field_xpos(cur);
cur->cursor_ypos = 0;
break;
case REQ_BEG_LINE:
cur->row_xpos = 0;
_formi_init_field_xpos(cur);
cur->start_char = 0;
break;
case REQ_END_FIELD:
if (cur->row_count > cur->rows) {
cur->start_line = cur->row_count - cur->rows;
cur->cursor_ypos = cur->rows - 1;
} else {
cur->start_line = 0;
cur->cursor_ypos = cur->row_count - 1;
}
/* we fall through here deliberately, we are on the
* correct row, now we need to get to the end of the
* line.
*/
/* FALLTHRU */
case REQ_END_LINE:
row = cur->start_line + cur->cursor_ypos;
start = cur->lines[row].start;
end = cur->lines[row].end;
if ((cur->rows + cur->nrows) == 1) {
if (cur->lines[row].length > cur->cols - 1) {
if ((cur->opts & O_STATIC) != O_STATIC) {
cur->start_char = tab_fit_window(
cur, end, cur->cols) + 1;
cur->row_xpos = cur->buffers[0].length
- cur->start_char;
} else {
cur->start_char = 0;
cur->row_xpos = cur->cols - 1;
}
} else {
cur->row_xpos = end + 1;
cur->start_char = 0;
}
_formi_set_cursor_xpos(cur, FALSE);
} else {
cur->row_xpos = end - start;
cur->cursor_xpos = cur->lines[row].length - 1;
if (row == (cur->row_count - 1)) {
cur->row_xpos++;
cur->cursor_xpos++;
}
}
break;
case REQ_NEW_LINE:
if ((status = split_line(cur,
cur->start_char + cur->row_xpos)) != E_OK)
return status;
break;
case REQ_INS_CHAR:
if ((status = _formi_add_char(cur, cur->start_char
+ cur->row_xpos,
cur->pad)) != E_OK)
return status;
break;
case REQ_INS_LINE:
start = cur->lines[cur->start_line + cur->cursor_ypos].start;
if ((status = split_line(cur, start)) != E_OK)
return status;
break;
case REQ_DEL_CHAR:
if (cur->buffers[0].length == 0)
return E_REQUEST_DENIED;
row = cur->start_line + cur->cursor_ypos;
start = cur->start_char + cur->row_xpos
+ cur->lines[row].start;
end = cur->buffers[0].length;
if (start >= cur->buffers[0].length)
return E_REQUEST_DENIED;
if (start == cur->lines[row].end) {
if ((cur->rows + cur->nrows) > 1) {
/*
* If we have more than one row, join the
* next row to make things easier unless
* we are at the end of the string, in
* that case the join would fail but we
* really want to delete the last char
* in the field.
*/
if ((cur->row_count > 1)
&& (start != (end - 1))) {
if (_formi_join_line(cur,
start,
JOIN_NEXT_NW)
!= E_OK) {
return E_REQUEST_DENIED;
}
}
}
}
saved = cur->buffers[0].string[start];
bcopy(&cur->buffers[0].string[start + 1],
&cur->buffers[0].string[start],
(unsigned) end - start + 1);
bump_lines(cur, _FORMI_USE_CURRENT, -1, TRUE);
cur->buffers[0].length--;
/*
* recalculate tabs for a single line field, multiline
* fields will do this when the field is wrapped.
*/
if ((cur->rows + cur->nrows) == 1)
_formi_calculate_tabs(cur, 0);
/*
* if we are at the end of the string then back the
* cursor pos up one to stick on the end of the line
*/
if (start == cur->buffers[0].length) {
if (cur->buffers[0].length > 1) {
if ((cur->rows + cur->nrows) == 1) {
pos = cur->row_xpos + cur->start_char;
cur->start_char =
tab_fit_window(
cur,
cur->start_char + cur->row_xpos,
cur->cols);
cur->row_xpos = pos - cur->start_char
- 1;
_formi_set_cursor_xpos(cur, FALSE);
} else {
if (cur->row_xpos == 0) {
if (cur->lines[row].start !=
cur->buffers[0].length) {
if (_formi_join_line(
cur,
cur->lines[row].start,
JOIN_PREV_NW)
!= E_OK) {
return E_REQUEST_DENIED;
}
} else {
if (cur->row_count > 1)
cur->row_count--;
}
row = cur->start_line
+ cur->cursor_ypos;
if (row > 0)
row--;
}
cur->row_xpos = start
- cur->lines[row].start - 1;
cur->cursor_xpos =
_formi_tab_expanded_length(
&cur->buffers[0].string[cur->lines[row].start],
0, cur->row_xpos);
if ((cur->cursor_xpos > 0)
&& (start != (cur->buffers[0].length - 1)))
cur->cursor_xpos--;
if (row >= cur->rows)
cur->start_line = row
- cur->cursor_ypos;
else {
cur->start_line = 0;
cur->cursor_ypos = row;
}
}
start--;
} else {
start = 0;
cur->row_xpos = 0;
_formi_init_field_xpos(cur);
}
}
if ((cur->rows + cur->nrows) > 1) {
if (_formi_wrap_field(cur, start) != E_OK) {
bcopy(&cur->buffers[0].string[start],
&cur->buffers[0].string[start + 1],
(unsigned) end - start);
cur->buffers[0].length++;
cur->buffers[0].string[start] = saved;
bump_lines(cur, _FORMI_USE_CURRENT, 1, TRUE);
_formi_wrap_field(cur, start);
return E_REQUEST_DENIED;
}
}
break;
case REQ_DEL_PREV:
if ((cur->cursor_xpos == 0) && (cur->start_char == 0)
&& (cur->start_line == 0) && (cur->cursor_ypos == 0))
return E_REQUEST_DENIED;
row = cur->start_line + cur->cursor_ypos;
start = cur->row_xpos + cur->start_char
+ cur->lines[row].start;
end = cur->buffers[0].length;
if ((cur->start_char + cur->row_xpos) == 0) {
/*
* Join this line to the next one, but only if
* we are not at the end of the string because
* in that case there are no characters to join.
*/
if (cur->lines[row].start != end) {
if (_formi_join_line(cur,
cur->lines[row].start,
JOIN_PREV_NW) != E_OK) {
return E_REQUEST_DENIED;
}
} else {
/* but we do want the row count decremented */
if (cur->row_count > 1)
cur->row_count--;
}
}
saved = cur->buffers[0].string[start - 1];
bcopy(&cur->buffers[0].string[start],
&cur->buffers[0].string[start - 1],
(unsigned) end - start + 1);
bump_lines(cur, (int) start - 1, -1, TRUE);
cur->buffers[0].length--;
if ((cur->rows + cur->nrows) == 1) {
_formi_calculate_tabs(cur, 0);
pos = cur->row_xpos + cur->start_char;
if (pos > 0)
pos--;
cur->start_char =
tab_fit_window(cur,
cur->start_char + cur->row_xpos,
cur->cols);
cur->row_xpos = pos - cur->start_char;
_formi_set_cursor_xpos(cur, FALSE);
} else {
pos = start - 1;
if (pos >= cur->buffers[0].length)
pos = cur->buffers[0].length - 1;
if ((_formi_wrap_field(cur, pos) != E_OK)) {
bcopy(&cur->buffers[0].string[start - 1],
&cur->buffers[0].string[start],
(unsigned) end - start);
cur->buffers[0].length++;
cur->buffers[0].string[start - 1] = saved;
bump_lines(cur, (int) start - 1, 1, TRUE);
_formi_wrap_field(cur, pos);
return E_REQUEST_DENIED;
}
row = find_cur_line(cur, pos);
cur->row_xpos = start - cur->lines[row].start - 1;
cur->cursor_xpos = _formi_tab_expanded_length(
&cur->buffers[0].string[cur->lines[row].start],
0, cur->row_xpos);
if ((cur->cursor_xpos > 0)
&& (pos != (cur->buffers[0].length - 1)))
cur->cursor_xpos--;
if (row >= cur->rows)
cur->start_line = row - cur->cursor_ypos;
else {
cur->start_line = 0;
cur->cursor_ypos = row;
}
}
break;
case REQ_DEL_LINE:
row = cur->start_line + cur->cursor_ypos;
start = cur->lines[row].start;
end = cur->lines[row].end;
bcopy(&cur->buffers[0].string[end + 1],
&cur->buffers[0].string[start],
(unsigned) cur->buffers[0].length - end + 1);
if (((cur->rows + cur->nrows) == 1) ||
(cur->row_count == 1)) {
/* single line case */
cur->buffers[0].length = 0;
cur->lines[0].end = cur->lines[0].length = 0;
cur->row_xpos = 0;
_formi_init_field_xpos(cur);
cur->cursor_ypos = 0;
} else {
/* multiline field */
old_count = cur->row_count;
cur->row_count--;
if (cur->row_count == 0)
cur->row_count = 1;
if (cur->row_count > 1)
bcopy(&cur->lines[row + 1],
&cur->lines[row],
(unsigned) (cur->row_count - row)
* sizeof(struct _formi_field_lines));
cur->lines[row].start = start;
len = start - end - 1; /* yes, this is negative */
if (row < (cur->row_count - 1))
bump_lines(cur, (int) start, len, FALSE);
else if (old_count == 1) {
cur->lines[0].end = cur->lines[0].length = 0;
cur->cursor_xpos = 0;
cur->row_xpos = 0;
cur->cursor_ypos = 0;
} else if (cur->row_count == 1) {
cur->lines[0].length = cur->buffers[0].length
+ len;
cur->lines[0].end = cur->lines[0].length - 1;
}
cur->buffers[0].length += len;
if (row > (cur->row_count - 1)) {
row--;
if (cur->cursor_ypos == 0) {
if (cur->start_line > 0) {
cur->start_line--;
}
} else {
cur->cursor_ypos--;
}
}
if (old_count > 1) {
if (cur->cursor_xpos > cur->lines[row].length) {
cur->cursor_xpos =
cur->lines[row].length - 1;
cur->row_xpos = cur->lines[row].end;
}
if (row >= cur->rows)
cur->start_line = row
- cur->cursor_ypos;
else {
cur->start_line = 0;
cur->cursor_ypos = row;
}
}
}
break;
case REQ_DEL_WORD:
start = cur->start_char + cur->row_xpos
+ cur->lines[row].start;
str = cur->buffers[0].string;
end = find_eow(str, start);
/*
* If not at the start of a word then find the start,
* we cannot blindly call find_sow because this will
* skip back a word if we are already at the start of
* a word.
*/
if ((start > 0)
&& !(isblank(str[start - 1]) && !isblank(str[start])))
start = find_sow(cur->buffers[0].string, start);
bcopy(&cur->buffers[0].string[end],
&cur->buffers[0].string[start],
(unsigned) cur->buffers[0].length - end + 1);
len = end - start;
cur->buffers[0].length -= len;
bump_lines(cur, _FORMI_USE_CURRENT, - (int) len, TRUE);
if ((cur->rows + cur->nrows) > 1) {
row = cur->start_line + cur->cursor_ypos;
if ((row + 1) < cur->row_count) {
/*
* if not on the last row we need to
* join on the next row so the line
* will be re-wrapped.
*/
_formi_join_line(cur, cur->lines[row].end,
JOIN_NEXT_NW);
}
_formi_wrap_field(cur, start);
row = find_cur_line(cur, start);
cur->row_xpos = start - cur->lines[row].start;
cur->cursor_xpos = _formi_tab_expanded_length(
&cur->buffers[0].string[cur->lines[row].start],
0, cur->row_xpos);
if ((cur->cursor_xpos > 0)
&& (start != (cur->buffers[0].length - 1)))
cur->cursor_xpos--;
} else {
_formi_calculate_tabs(cur, 0);
cur->row_xpos = start - cur->start_char;
if (cur->row_xpos > 0)
cur->row_xpos--;
_formi_set_cursor_xpos(cur, FALSE);
}
break;
case REQ_CLR_EOL:
row = cur->start_line + cur->cursor_ypos;
start = cur->start_char + cur->cursor_xpos;
end = cur->lines[row].end;
len = end - start;
bcopy(&cur->buffers[0].string[end + 1],
&cur->buffers[0].string[start],
cur->buffers[0].length - end + 1);
cur->buffers[0].length -= len;
bump_lines(cur, _FORMI_USE_CURRENT, - (int) len, TRUE);
if (cur->row_xpos > cur->lines[row].length) {
cur->row_xpos = cur->lines[row].end;
if (cur->rows + cur->nrows == 1)
_formi_set_cursor_xpos(cur, FALSE);
else
cur->cursor_xpos = cur->lines[row].length;
}
break;
case REQ_CLR_EOF:
row = cur->start_line + cur->cursor_ypos;
cur->buffers[0].string[cur->start_char
+ cur->cursor_xpos] = '\0';
cur->buffers[0].length = strlen(cur->buffers[0].string);
cur->lines[row].end = cur->buffers[0].length;
cur->lines[row].length = cur->lines[row].end
- cur->lines[row].start;
break;
case REQ_CLR_FIELD:
cur->buffers[0].string[0] = '\0';
cur->buffers[0].length = 0;
cur->row_count = 1;
cur->start_line = 0;
cur->cursor_ypos = 0;
cur->row_xpos = 0;
_formi_init_field_xpos(cur);
cur->start_char = 0;
cur->lines[0].start = 0;
cur->lines[0].end = 0;
cur->lines[0].length = 0;
break;
case REQ_OVL_MODE:
cur->overlay = 1;
break;
case REQ_INS_MODE:
cur->overlay = 0;
break;
case REQ_SCR_FLINE:
_formi_scroll_fwd(cur, 1);
break;
case REQ_SCR_BLINE:
_formi_scroll_back(cur, 1);
break;
case REQ_SCR_FPAGE:
_formi_scroll_fwd(cur, cur->rows);
break;
case REQ_SCR_BPAGE:
_formi_scroll_back(cur, cur->rows);
break;
case REQ_SCR_FHPAGE:
_formi_scroll_fwd(cur, cur->rows / 2);
break;
case REQ_SCR_BHPAGE:
_formi_scroll_back(cur, cur->rows / 2);
break;
case REQ_SCR_FCHAR:
_formi_hscroll_fwd(cur, 1);
break;
case REQ_SCR_BCHAR:
_formi_hscroll_back(cur, 1);
break;
case REQ_SCR_HFLINE:
_formi_hscroll_fwd(cur, cur->cols);
break;
case REQ_SCR_HBLINE:
_formi_hscroll_back(cur, cur->cols);
break;
case REQ_SCR_HFHALF:
_formi_hscroll_fwd(cur, cur->cols / 2);
break;
case REQ_SCR_HBHALF:
_formi_hscroll_back(cur, cur->cols / 2);
break;
default:
return 0;
}
#ifdef DEBUG
fprintf(dbg,
"exit: xpos=%d, row_pos=%d, start_char=%d, length=%d, allocated=%d\n",
cur->cursor_xpos, cur->row_xpos, cur->start_char,
cur->buffers[0].length, cur->buffers[0].allocated);
fprintf(dbg, "exit: start_line=%d, ypos=%d\n", cur->start_line,
cur->cursor_ypos);
fprintf(dbg, "exit: string=\"%s\"\n", cur->buffers[0].string);
assert ((cur->cursor_xpos < INT_MAX) && (cur->row_xpos < INT_MAX)
&& (cur->cursor_xpos >= cur->row_xpos));
#endif
return 1;
}
/*
* Validate the give character by passing it to any type character
* checking routines, if they exist.
*/
int
_formi_validate_char(FIELD *field, char c)
{
int ret_val;
if (field->type == NULL)
return E_OK;
ret_val = E_INVALID_FIELD;
_formi_do_char_validation(field, field->type, c, &ret_val);
return ret_val;
}
/*
* Perform the validation of the character, invoke all field_type validation
* routines. If the field is ok then update ret_val to E_OK otherwise
* ret_val is not changed.
*/
static void
_formi_do_char_validation(FIELD *field, FIELDTYPE *type, char c, int *ret_val)
{
if ((type->flags & _TYPE_IS_LINKED) == _TYPE_IS_LINKED) {
_formi_do_char_validation(field, type->link->next, c, ret_val);
_formi_do_char_validation(field, type->link->prev, c, ret_val);
} else {
if (type->char_check == NULL)
*ret_val = E_OK;
else {
if (type->char_check((int)(unsigned char) c,
field->args) == TRUE)
*ret_val = E_OK;
}
}
}
/*
* Validate the current field. If the field validation returns success then
* return E_OK otherwise return E_INVALID_FIELD.
*
*/
int
_formi_validate_field(FORM *form)
{
FIELD *cur;
char *bp;
int ret_val, count;
if ((form == NULL) || (form->fields == NULL) ||
(form->fields[0] == NULL))
return E_INVALID_FIELD;
cur = form->fields[form->cur_field];
bp = cur->buffers[0].string;
count = _formi_skip_blanks(bp, 0);
/* check if we have a null field, depending on the nullok flag
* this may be acceptable or not....
*/
if (cur->buffers[0].string[count] == '\0') {
if ((cur->opts & O_NULLOK) == O_NULLOK)
return E_OK;
else
return E_INVALID_FIELD;
}
/* check if an unmodified field is ok */
if (cur->buf0_status == 0) {
if ((cur->opts & O_PASSOK) == O_PASSOK)
return E_OK;
else
return E_INVALID_FIELD;
}
/* if there is no type then just accept the field */
if (cur->type == NULL)
return E_OK;
ret_val = E_INVALID_FIELD;
_formi_do_validation(cur, cur->type, &ret_val);
return ret_val;
}
/*
* Perform the validation of the field, invoke all field_type validation
* routines. If the field is ok then update ret_val to E_OK otherwise
* ret_val is not changed.
*/
static void
_formi_do_validation(FIELD *field, FIELDTYPE *type, int *ret_val)
{
if ((type->flags & _TYPE_IS_LINKED) == _TYPE_IS_LINKED) {
_formi_do_validation(field, type->link->next, ret_val);
_formi_do_validation(field, type->link->prev, ret_val);
} else {
if (type->field_check == NULL)
*ret_val = E_OK;
else {
if (type->field_check(field, field_buffer(field, 0))
== TRUE)
*ret_val = E_OK;
}
}
}
/*
* Select the next/previous choice for the field, the driver command
* selecting the direction will be passed in c. Return 1 if a choice
* selection succeeded, 0 otherwise.
*/
int
_formi_field_choice(FORM *form, int c)
{
FIELDTYPE *type;
FIELD *field;
if ((form == NULL) || (form->fields == NULL) ||
(form->fields[0] == NULL) ||
(form->fields[form->cur_field]->type == NULL))
return 0;
field = form->fields[form->cur_field];
type = field->type;
switch (c) {
case REQ_NEXT_CHOICE:
if (type->next_choice == NULL)
return 0;
else
return type->next_choice(field,
field_buffer(field, 0));
case REQ_PREV_CHOICE:
if (type->prev_choice == NULL)
return 0;
else
return type->prev_choice(field,
field_buffer(field, 0));
default: /* should never happen! */
return 0;
}
}
/*
* Update the fields if they have changed. The parameter old has the
* previous current field as the current field may have been updated by
* the driver. Return 1 if the form page needs updating.
*
*/
int
_formi_update_field(FORM *form, int old_field)
{
int cur, i;
cur = form->cur_field;
if (old_field != cur) {
if (!((cur >= form->page_starts[form->page].first) &&
(cur <= form->page_starts[form->page].last))) {
/* not on same page any more */
for (i = 0; i < form->max_page; i++) {
if ((form->page_starts[i].in_use == 1) &&
(form->page_starts[i].first <= cur) &&
(form->page_starts[i].last >= cur)) {
form->page = i;
return 1;
}
}
}
}
_formi_redraw_field(form, old_field);
_formi_redraw_field(form, form->cur_field);
return 0;
}
/*
* Compare function for the field sorting
*
*/
static int
field_sort_compare(const void *one, const void *two)
{
const FIELD *a, *b;
int tl;
/* LINTED const castaway; we don't modify these! */
a = (const FIELD *) *((const FIELD **) one);
b = (const FIELD *) *((const FIELD **) two);
if (a == NULL)
return 1;
if (b == NULL)
return -1;
/*
* First check the page, we want the fields sorted by page.
*
*/
if (a->page != b->page)
return ((a->page > b->page)? 1 : -1);
tl = _formi_top_left(a->parent, a->index, b->index);
/*
* sort fields left to right, top to bottom so the top left is
* the less than value....
*/
return ((tl == a->index)? -1 : 1);
}
/*
* Sort the fields in a form ready for driver traversal.
*/
void
_formi_sort_fields(FORM *form)
{
FIELD **sort_area;
int i;
CIRCLEQ_INIT(&form->sorted_fields);
if ((sort_area = (FIELD **) malloc(sizeof(FIELD *) * form->field_count))
== NULL)
return;
bcopy(form->fields, sort_area, sizeof(FIELD *) * form->field_count);
qsort(sort_area, (unsigned) form->field_count, sizeof(FIELD *),
field_sort_compare);
for (i = 0; i < form->field_count; i++)
CIRCLEQ_INSERT_TAIL(&form->sorted_fields, sort_area[i], glue);
free(sort_area);
}
/*
* Set the neighbours for all the fields in the given form.
*/
void
_formi_stitch_fields(FORM *form)
{
int above_row, below_row, end_above, end_below, cur_row, real_end;
FIELD *cur, *above, *below;
/*
* check if the sorted fields circle queue is empty, just
* return if it is.
*/
if (CIRCLEQ_EMPTY(&form->sorted_fields))
return;
/* initially nothing is above..... */
above_row = -1;
end_above = TRUE;
above = NULL;
/* set up the first field as the current... */
cur = CIRCLEQ_FIRST(&form->sorted_fields);
cur_row = cur->form_row;
/* find the first field on the next row if any */
below = CIRCLEQ_NEXT(cur, glue);
below_row = -1;
end_below = TRUE;
real_end = TRUE;
while (below != (void *)&form->sorted_fields) {
if (below->form_row != cur_row) {
below_row = below->form_row;
end_below = FALSE;
real_end = FALSE;
break;
}
below = CIRCLEQ_NEXT(below, glue);
}
/* walk the sorted fields, setting the neighbour pointers */
while (cur != (void *) &form->sorted_fields) {
if (cur == CIRCLEQ_FIRST(&form->sorted_fields))
cur->left = NULL;
else
cur->left = CIRCLEQ_PREV(cur, glue);
if (cur == CIRCLEQ_LAST(&form->sorted_fields))
cur->right = NULL;
else
cur->right = CIRCLEQ_NEXT(cur, glue);
if (end_above == TRUE)
cur->up = NULL;
else {
cur->up = above;
above = CIRCLEQ_NEXT(above, glue);
if (above_row != above->form_row) {
end_above = TRUE;
above_row = above->form_row;
}
}
if (end_below == TRUE)
cur->down = NULL;
else {
cur->down = below;
below = CIRCLEQ_NEXT(below, glue);
if (below == (void *) &form->sorted_fields) {
end_below = TRUE;
real_end = TRUE;
} else if (below_row != below->form_row) {
end_below = TRUE;
below_row = below->form_row;
}
}
cur = CIRCLEQ_NEXT(cur, glue);
if ((cur != (void *) &form->sorted_fields)
&& (cur_row != cur->form_row)) {
cur_row = cur->form_row;
if (end_above == FALSE) {
for (; above != CIRCLEQ_FIRST(&form->sorted_fields);
above = CIRCLEQ_NEXT(above, glue)) {
if (above->form_row != above_row) {
above_row = above->form_row;
break;
}
}
} else if (above == NULL) {
above = CIRCLEQ_FIRST(&form->sorted_fields);
end_above = FALSE;
above_row = above->form_row;
} else
end_above = FALSE;
if (end_below == FALSE) {
while (below_row == below->form_row) {
below = CIRCLEQ_NEXT(below,
glue);
if (below ==
(void *)&form->sorted_fields) {
real_end = TRUE;
end_below = TRUE;
break;
}
}
if (below != (void *)&form->sorted_fields)
below_row = below->form_row;
} else if (real_end == FALSE)
end_below = FALSE;
}
}
}
/*
* Calculate the length of the displayed line allowing for any tab
* characters that need to be expanded. We assume that the tab stops
* are 8 characters apart. The parameters start and end are the
* character positions in the string str we want to get the length of,
* the function returns the number of characters from the start
* position to the end position that should be displayed after any
* intervening tabs have been expanded.
*/
int
_formi_tab_expanded_length(char *str, unsigned int start, unsigned int end)
{
int len, start_len, i;
/* if we have a null string then there is no length */
if (str[0] == '\0')
return 0;
len = 0;
start_len = 0;
/*
* preceding tabs affect the length tabs in the span, so
* we need to calculate the length including the stuff before
* start and then subtract off the unwanted bit.
*/
for (i = 0; i <= end; i++) {
if (i == start) /* stash preamble length for later */
start_len = len;
if (str[i] == '\0')
break;
if (str[i] == '\t')
len = len - (len % 8) + 8;
else
len++;
}
#ifdef DEBUG
if (dbg != NULL) {
fprintf(dbg,
"tab_expanded: start=%d, end=%d, expanded=%d (diff=%d)\n",
start, end, (len - start_len), (end - start));
}
#endif
return (len - start_len);
}
/*
* Calculate the tab stops on a given line in the field and set up
* the tabs list with the results. We do this by scanning the line for tab
* characters and if one is found, noting the position and the number of
* characters to get to the next tab stop. This information is kept to
* make manipulating the field (scrolling and so on) easier to handle.
*/
void
_formi_calculate_tabs(FIELD *field, unsigned row)
{
_formi_tab_t *ts = field->lines[row].tabs, *old_ts = NULL, **tsp;
int i, j;
/*
* If the line already has tabs then invalidate them by
* walking the list and killing the in_use flag.
*/
for (; ts != NULL; ts = ts->fwd)
ts->in_use = FALSE;
/*
* Now look for tabs in the row and record the info...
*/
tsp = &field->lines[row].tabs;
for (i = field->lines[row].start, j = 0; i <= field->lines[row].end;
i++, j++) {
if (field->buffers[0].string[i] == '\t') {
if (*tsp == NULL) {
if ((*tsp = (_formi_tab_t *)
malloc(sizeof(_formi_tab_t))) == NULL)
return;
(*tsp)->back = old_ts;
(*tsp)->fwd = NULL;
}
(*tsp)->in_use = TRUE;
(*tsp)->pos = i - field->lines[row].start;
(*tsp)->size = 8 - (j % 8);
j += (*tsp)->size - 1;
old_ts = *tsp;
tsp = &(*tsp)->fwd;
}
}
}
/*
* Return the size of the tab padding for a tab character at the given
* position. Return 1 if there is not a tab char entry matching the
* given location.
*/
static int
tab_size(FIELD *field, unsigned int offset, unsigned int i)
{
int row;
_formi_tab_t *ts;
row = find_cur_line(field, offset + i);
ts = field->lines[row].tabs;
while ((ts != NULL) && (ts->pos != i))
ts = ts->fwd;
if (ts == NULL)
return 1;
else
return ts->size;
}
/*
* Find the character offset that corresponds to longest tab expanded
* string that will fit into the given window. Walk the string backwards
* evaluating the sizes of any tabs that are in the string. Note that
* using this function on a multi-line window will produce undefined
* results - it is really only required for a single row field.
*/
static int
tab_fit_window(FIELD *field, unsigned int pos, unsigned int window)
{
int scroll_amt, i;
_formi_tab_t *ts;
/* first find the last tab */
ts = field->lines[0].tabs;
/*
* unless there are no tabs - just return the window size,
* if there is enough room, otherwise 0.
*/
if (ts == NULL) {
if (field->buffers[0].length < window)
return 0;
else
return field->buffers[0].length - window + 1;
}
while ((ts->fwd != NULL) && (ts->fwd->in_use == TRUE))
ts = ts->fwd;
/*
* now walk backwards finding the first tab that is to the
* left of our starting pos.
*/
while ((ts != NULL) && (ts->in_use == TRUE) && (ts->pos > pos))
ts = ts->back;
scroll_amt = 0;
for (i = pos; i >= 0; i--) {
if (field->buffers[0].string[i] == '\t') {
#ifdef DEBUG
assert((ts != NULL) && (ts->in_use == TRUE));
#endif
if (ts->pos == i) {
if ((scroll_amt + ts->size) > window) {
break;
}
scroll_amt += ts->size;
ts = ts->back;
}
#ifdef DEBUG
else
assert(ts->pos == i);
#endif
} else {
scroll_amt++;
if (scroll_amt > window)
break;
}
}
return ++i;
}
/*
* Return the position of the last character that will fit into the
* given width after tabs have been expanded for a given row of a given
* field.
*/
static unsigned int
tab_fit_len(FIELD *field, unsigned int row, unsigned int width)
{
unsigned int pos, len, row_pos;
_formi_tab_t *ts;
ts = field->lines[row].tabs;
pos = field->lines[row].start;
len = 0;
row_pos = 0;
while ((len < width) && (pos < field->buffers[0].length)) {
if (field->buffers[0].string[pos] == '\t') {
#ifdef DEBUG
assert((ts != NULL) && (ts->in_use == TRUE));
#endif
if (ts->pos == row_pos) {
if ((len + ts->size) > width)
break;
len += ts->size;
ts = ts->fwd;
}
#ifdef DEBUG
else
assert(ts->pos == row_pos);
#endif
} else
len++;
pos++;
row_pos++;
}
if (pos > 0)
pos--;
return pos;
}
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