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NetBSD/lib/libform/internals.c

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/* $NetBSD: internals.c,v 1.15 2001/05/11 14:04:48 blymn 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 withough 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 <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;
#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
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);
/*
* 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)
{
int i, row;
#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
field->lines[row].length += amt;
if (field->lines[row].length > 1)
field->lines[row].end += amt;
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;
}
}
/*
* 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;
/* 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 pos)
{
char *str;
int width, row;
str = field->buffers[0].string;
/* Don't bother if the field string is too short. */
if (field->buffers[0].length < field->cols)
return E_OK;
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;
}
}
for (row = 0; 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) ||
(field->lines[row].length == width)) {
/* if line is just right or 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 */
pos = width + field->lines[row].start;
if (pos >= field->buffers[0].length)
pos = field->buffers[0].length - 1;
if ((!isblank(str[pos])) &&
((field->opts & O_WRAP) == O_WRAP)) {
pos = find_sow(str, (unsigned int) pos);
if ((pos == 0) || (!isblank(str[pos - 1]))) {
return E_REQUEST_DENIED;
}
}
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;
if ((saved = (struct _formi_field_lines *)
malloc(field->row_count * 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);
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;
}
field->lines[row].end = field->lines[row + 1].end;
field->lines[row].length += field->lines[row + 1].length;
/* 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;
}
field->lines[row - 1].end = field->lines[row].end;
field->lines[row - 1].length += field->lines[row].length;
/* shift all the remaining lines up */
for (i = row + 1; i < field->row_count; i++)
field->lines[i - 1] = field->lines[i];
}
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;
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);
}
#endif
field->lines[row + 1].end = field->lines[row].end;
field->lines[row].end = pos - 1;
field->lines[row].length = pos - field->lines[row].start;
field->lines[row + 1].start = pos;
field->lines[row + 1].length = field->lines[row + 1].end
- field->lines[row + 1].start + 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)));
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\n", row + 1,
field->lines[row + 1].length);
}
#endif
for (i = row + 2; i < field->row_count; i++) {
field->lines[i + 1] = field->lines[i];
}
field->row_count++;
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)
{
field->start_char += min(amt,
field->lines[field->start_line + field->cursor_ypos].end);
}
/*
* 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);
}
/*
* 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;
char *str;
FIELD *cur;
#ifdef DEBUG
char buffer[100];
#endif
cur = form->fields[field];
str = cur->buffers[0].string;
flen = cur->cols;
slen = 0;
start = 0;
for (row = 0; row < cur->row_count; row++) {
wmove(form->scrwin, (int) (cur->form_row + row),
(int) cur->form_col);
start = cur->lines[row].start;
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;
post += cur->start_char;
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
for (i = 0; i < min(slen, flen); i++)
{
#ifdef DEBUG
fprintf(dbg, "adding char str[%d]=%c\n",
i + cur->start_char + cur->lines[row].start,
str[i + cur->start_char
+ cur->lines[row].start]);
#endif
if (((cur->opts & O_PUBLIC) != O_PUBLIC)) {
waddch(form->scrwin, cur->pad);
} else if ((cur->opts & O_VISIBLE) == O_VISIBLE) {
waddch(form->scrwin, str[i + cur->start_char
+ cur->lines[row].start]);
} else {
waddch(form->scrwin, ' ');
}
}
for (i = 0; i < post; i++)
waddch(form->scrwin, cur->pad);
}
return;
}
/*
* 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;
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;
}
#ifdef DEBUG
fprintf(dbg, "add_char: pos=%d, char=%c\n", pos, c);
fprintf(dbg,
"add_char enter: xpos=%d, start=%d, length=%d(%d), allocated=%d\n",
field->cursor_xpos, field->start_char,
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->cursor_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->cursor_xpos = 0;
field->cursor_ypos = 0;
field->lines[0].start = 0;
field->lines[0].end = 0;
field->lines[0].length = 0;
}
if ((field->overlay == 0)
|| ((field->overlay == 1) && (pos >= field->buffers[0].length))) {
/* first check if the field can have more chars...*/
if ((((field->opts & O_STATIC) == O_STATIC) &&
(field->buffers[0].length >= (field->cols * field->rows))) ||
(((field->opts & O_STATIC) != O_STATIC) &&
/*XXXXX this is wrong - should check max row or col */
((field->max > 0) &&
(field->buffers[0].length >= field->max))))
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);
}
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);
}
/* wrap the field, if needed */
status = _formi_wrap_field(field, pos);
if (status != E_OK) {
/* 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--;
} else {
field->buf0_status = TRUE;
if ((field->rows + field->nrows) == 1) {
if ((field->cursor_xpos < (field->cols - 1)) ||
((field->opts & O_STATIC) != O_STATIC))
field->cursor_xpos++;
if (field->cursor_xpos > field->cols) {
field->start_char++;
field->cursor_xpos = field->cols;
}
} else {
field->cursor_ypos = find_cur_line(field, pos)
- field->start_line;
field->cursor_xpos = pos
- field->lines[field->cursor_ypos
+ field->start_line].start + 1;
}
}
#ifdef DEBUG
fprintf(dbg,
"add_char exit: xpos=%d, start=%d, length=%d(%d), allocated=%d\n",
field->cursor_xpos, field->start_char,
field->buffers[0].length, strlen(field->buffers[0].string),
field->buffers[0].allocated);
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;
}
/*
* 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;
unsigned int i, start, end, pos, row, len, status;
cur = form->fields[form->cur_field];
#ifdef DEBUG
fprintf(dbg,
"entry: xpos=%d, start_char=%d, length=%d, allocated=%d\n",
cur->cursor_xpos, cur->start_char, cur->buffers[0].length,
cur->buffers[0].allocated);
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;
switch (c) {
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->cursor_xpos == cur->cols - 1))
return E_REQUEST_DENIED;
if ((cur->cursor_xpos + cur->start_char + 1)
> cur->buffers[0].length)
return E_REQUEST_DENIED;
cur->cursor_xpos++;
if (cur->cursor_xpos >= cur->cols - 1) {
cur->cursor_xpos = cur->cols - 1;
if ((cur->opts & O_STATIC) != O_STATIC)
cur->start_char++;
}
break;
case REQ_PREV_CHAR:
if (cur->cursor_xpos == 0) {
if (cur->start_char > 0)
cur->start_char--;
else
return E_REQUEST_DENIED;
} else
cur->cursor_xpos--;
break;
case REQ_NEXT_LINE:
cur->cursor_ypos++;
if (cur->cursor_ypos > cur->rows) {
if ((cur->opts & O_STATIC) == O_STATIC) {
if (cur->start_line + cur->cursor_ypos
> cur->drows) {
cur->cursor_ypos--;
return E_REQUEST_DENIED;
}
} else {
if (cur->start_line + cur->cursor_ypos
> cur->nrows + cur->rows) {
cur->cursor_ypos--;
return E_REQUEST_DENIED;
}
}
cur->start_line++;
}
break;
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--;
break;
case REQ_NEXT_WORD:
start = cur->start_char + cur->cursor_xpos;
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 (start - cur->start_char < cur->cols) {
cur->cursor_xpos = start;
} else {
cur->start_char = start;
cur->cursor_xpos = 0;
}
break;
case REQ_PREV_WORD:
start = cur->start_char + cur->cursor_xpos;
if (cur->start_char > 0)
start--;
if (start == 0)
return E_REQUEST_DENIED;
str = cur->buffers[0].string;
start = find_sow(str, start);
if (start - cur->start_char > 0) {
cur->cursor_xpos = start;
} else {
cur->start_char = start;
cur->cursor_xpos = 0;
}
break;
case REQ_BEG_FIELD:
cur->start_char = 0;
cur->start_line = 0;
cur->cursor_xpos = 0;
cur->cursor_ypos = 0;
break;
case REQ_BEG_LINE:
cur->start_char =
cur->lines[cur->start_line + cur->cursor_ypos].start;
cur->cursor_xpos = 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;
}
cur->start_char =
cur->lines[cur->start_line + cur->cursor_ypos].start;
cur->cursor_xpos = 0;
/* 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:
start = cur->lines[cur->start_line + cur->cursor_ypos].start;
end = cur->lines[cur->start_line + cur->cursor_ypos].end;
if (end - start > cur->cols - 1) {
cur->cursor_xpos = cur->cols - 1;
cur->start_char = end - cur->cols;
if ((cur->opts & O_STATIC) != O_STATIC)
cur->start_char++;
} else {
cur->cursor_xpos = end - start + 1;
if (((cur->opts & O_STATIC) == O_STATIC) &&
((end - start) == (cur->cols - 1)))
cur->cursor_xpos--;
cur->start_char = start;
}
break;
case REQ_LEFT_CHAR:
if ((cur->cursor_xpos == 0) && (cur->start_char == 0))
return E_REQUEST_DENIED;
if (cur->cursor_xpos == 0) {
cur->start_char--;
start = cur->lines[cur->cursor_ypos
+ cur->start_line].start;
if (cur->start_char < start) {
if ((cur->cursor_ypos == 0) &&
(cur->start_line == 0))
{
cur->start_char++;
return E_REQUEST_DENIED;
}
if (cur->cursor_ypos == 0)
cur->start_line--;
else
cur->cursor_ypos--;
end = cur->lines[cur->cursor_ypos
+ cur->start_line].end;
len = cur->lines[cur->cursor_ypos
+ cur->start_line].length;
if (len >= cur->cols) {
cur->cursor_xpos = cur->cols - 1;
cur->start_char = end - cur->cols;
} else {
cur->cursor_xpos = len;
cur->start_char = start;
}
}
} else
cur->cursor_xpos--;
break;
case REQ_RIGHT_CHAR:
pos = cur->start_char + cur->cursor_xpos;
row = cur->start_line + cur->cursor_ypos;
end = cur->lines[row].end;
if (cur->buffers[0].string[pos] == '\0')
return E_REQUEST_DENIED;
#ifdef DEBUG
fprintf(dbg, "req_right_char enter: start=%d, xpos=%d, c=%c\n",
cur->start_char, cur->cursor_xpos,
cur->buffers[0].string[pos]);
#endif
if (pos == end) {
start = pos + 1;
if ((cur->buffers[0].length <= start)
|| ((row + 1) >= cur->row_count))
return E_REQUEST_DENIED;
if ((cur->cursor_ypos + 1) >= cur->rows) {
cur->start_line++;
cur->cursor_ypos = cur->rows - 1;
} else
cur->cursor_ypos++;
row++;
cur->cursor_xpos = 0;
cur->start_char = cur->lines[row].start;
} else {
if (cur->cursor_xpos == cur->cols - 1)
cur->start_char++;
else
cur->cursor_xpos++;
}
#ifdef DEBUG
fprintf(dbg, "req_right_char exit: start=%d, xpos=%d, c=%c\n",
cur->start_char, cur->cursor_xpos,
cur->buffers[0].string[cur->start_char +
cur->cursor_xpos]);
#endif
break;
case REQ_UP_CHAR:
if (cur->cursor_ypos == 0) {
if (cur->start_line == 0)
return E_REQUEST_DENIED;
cur->start_line--;
} else
cur->cursor_ypos--;
row = cur->start_line + cur->cursor_ypos;
cur->start_char = cur->lines[row].start;
if (cur->cursor_xpos > cur->lines[row].length)
cur->cursor_xpos = cur->lines[row].length;
break;
case REQ_DOWN_CHAR:
if (cur->cursor_ypos == cur->rows - 1) {
if (cur->start_line + cur->rows == cur->row_count)
return E_REQUEST_DENIED;
cur->start_line++;
} else
cur->cursor_ypos++;
row = cur->start_line + cur->cursor_ypos;
cur->start_char = cur->lines[row].start;
if (cur->cursor_xpos > cur->lines[row].length)
cur->cursor_xpos = cur->lines[row].length;
break;
case REQ_NEW_LINE:
if ((status = split_line(cur,
cur->start_char + cur->cursor_xpos)) != E_OK)
return status;
break;
case REQ_INS_CHAR:
_formi_add_char(cur, cur->start_char + cur->cursor_xpos,
cur->pad);
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->cursor_xpos;
end = cur->buffers[0].length;
if (start == cur->lines[row].start) {
if (cur->row_count > 1) {
if (_formi_join_line(cur,
start, JOIN_NEXT) != E_OK) {
return E_REQUEST_DENIED;
}
} else {
cur->buffers[0].string[start] = '\0';
if (cur->lines[row].end > 0) {
cur->lines[row].end--;
cur->lines[row].length--;
}
}
} else {
bcopy(&cur->buffers[0].string[start + 1],
&cur->buffers[0].string[start],
(unsigned) end - start + 1);
bump_lines(cur, _FORMI_USE_CURRENT, -1);
}
cur->buffers[0].length--;
break;
case REQ_DEL_PREV:
if ((cur->cursor_xpos == 0) && (cur->start_char == 0))
return E_REQUEST_DENIED;
start = cur->cursor_xpos + cur->start_char;
end = cur->buffers[0].length;
row = cur->start_line + cur->cursor_ypos;
if (cur->lines[row].start ==
(cur->start_char + cur->cursor_xpos)) {
_formi_join_line(cur,
cur->start_char + cur->cursor_xpos,
JOIN_PREV);
} else {
bcopy(&cur->buffers[0].string[start],
&cur->buffers[0].string[start - 1],
(unsigned) end - start + 1);
bump_lines(cur, _FORMI_USE_CURRENT, -1);
}
cur->buffers[0].length--;
if ((cur->cursor_xpos == 0) && (cur->start_char > 0))
cur->start_char--;
else if ((cur->cursor_xpos == cur->cols - 1)
&& (cur->start_char > 0))
cur->start_char--;
else if (cur->cursor_xpos > 0)
cur->cursor_xpos--;
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->row_count > 1) {
cur->row_count--;
bcopy(&cur->lines[row + 1], &cur->lines[row],
sizeof(struct _formi_field_lines)
* cur->row_count);
len = end - start;
for (i = row; i < cur->row_count; i++) {
cur->lines[i].start -= len;
cur->lines[i].end -= len;
}
if (row > cur->row_count) {
if (cur->cursor_ypos == 0) {
if (cur->start_line > 0) {
cur->start_line--;
}
} else {
cur->cursor_ypos--;
}
row--;
}
if (cur->cursor_xpos > cur->lines[row].length)
cur->cursor_xpos = cur->lines[row].length;
}
break;
case REQ_DEL_WORD:
start = cur->start_char + cur->cursor_xpos;
end = find_eow(cur->buffers[0].string, start);
start = find_sow(cur->buffers[0].string, start);
bcopy(&cur->buffers[0].string[end + 1],
&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);
if (cur->cursor_xpos > cur->lines[row].length)
cur->cursor_xpos = cur->lines[row].length;
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);
if (cur->cursor_xpos > cur->lines[row].length)
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;
for (i = cur->start_char + cur->cursor_xpos;
i < cur->buffers[0].length; i++)
cur->buffers[0].string[i] = cur->pad;
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->cursor_xpos = 0;
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, start_char=%d, length=%d, allocated=%d\n",
cur->cursor_xpos, cur->start_char, cur->buffers[0].length,
cur->buffers[0].allocated);
fprintf(dbg, "exit: string=\"%s\"\n", cur->buffers[0].string);
#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;
}
}
}
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