netsurf/render/form.c

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/*
* This file is part of NetSurf, http://netsurf.sourceforge.net/
* Licensed under the GNU General Public License,
* http://www.opensource.org/licenses/gpl-license
* Copyright 2003 James Bursa <bursa@users.sourceforge.net>
* Copyright 2003 Phil Mellor <monkeyson@users.sourceforge.net>
*/
/** \file
* Form handling functions (implementation).
*/
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include "curl/curl.h"
#include "netsurf/render/box.h"
#include "netsurf/render/form.h"
#include "netsurf/utils/utils.h"
static char *form_textarea_value(struct form_control *textarea);
/**
* Add a control to the list of controls in a form.
*/
void form_add_control(struct form *form, struct form_control *control)
{
control->form = form;
if (form->controls) {
assert(form->last_control);
form->last_control->next = control;
control->next = 0;
form->last_control = control;
} else {
form->controls = form->last_control = control;
}
}
/**
* Identify 'successful' controls.
*
* See HTML 4.01 section 17.13.2.
*/
struct form_successful_control *form_successful_controls(struct form *form,
struct form_control *submit_button)
{
struct form_control *control;
struct form_option *option;
struct form_successful_control sentinel, *last_success;
last_success = &sentinel;
for (control = form->controls; control; control = control->next) {
struct form_successful_control *success_new;
/* ignore disabled controls */
if (control->disabled)
continue;
/* ignore controls with no name */
if (!control->name)
continue;
/* only the activated submit button is successful */
if (control->type == GADGET_SUBMIT && control != submit_button)
continue;
/* ignore checkboxes and radio buttons which aren't selected */
if (control->type == GADGET_CHECKBOX && !control->data.checkbox.selected)
continue;
if (control->type == GADGET_RADIO && !control->data.radio.selected)
continue;
/* select */
if (control->type == GADGET_SELECT) {
for (option = control->data.select.items; option;
option = option->next) {
if (option->selected) {
success_new = xcalloc(1, sizeof(*success_new));
success_new->file = false;
success_new->name = xstrdup(control->name);
success_new->value = xstrdup(option->value);
success_new->next = 0;
last_success->next = success_new;
last_success = success_new;
}
}
continue;
}
/* textarea */
if (control->type == GADGET_TEXTAREA) {
success_new = xcalloc(1, sizeof(*success_new));
success_new->file = false;
success_new->name = xstrdup(control->name);
success_new->value = form_textarea_value(control);
success_new->next = 0;
last_success->next = success_new;
last_success = success_new;
continue;
}
/* image */
if (control->type == GADGET_IMAGE) {
unsigned int len = strlen(control->name) + 3;
/* x */
success_new = xcalloc(1, sizeof(*success_new));
success_new->file = false;
success_new->name = xcalloc(1, len);
sprintf(success_new->name, "%s.x", control->name);
success_new->value = xcalloc(1, 20);
sprintf(success_new->value, "%i", control->data.image.mx);
success_new->next = 0;
last_success->next = success_new;
last_success = success_new;
/* y */
success_new = xcalloc(1, sizeof(*success_new));
success_new->file = false;
success_new->name = xcalloc(1, len);
sprintf(success_new->name, "%s.y", control->name);
success_new->value = xcalloc(1, 20);
sprintf(success_new->value, "%i", control->data.image.my);
success_new->next = 0;
last_success->next = success_new;
last_success = success_new;
}
/* ignore reset */
if (control->type == GADGET_RESET)
continue;
/* file */
if (control->type == GADGET_FILE) {
success_new = xcalloc(1, sizeof(*success_new));
success_new->file = true;
success_new->name = xstrdup(control->name);
success_new->value = xstrdup(control->value);
success_new->next = 0;
last_success->next = success_new;
last_success = success_new;
continue;
}
/* all others added if they have a value */
if (control->value) {
success_new = xcalloc(1, sizeof(*success_new));
success_new->file = false;
success_new->name = xstrdup(control->name);
success_new->value = xstrdup(control->value);
success_new->next = 0;
last_success->next = success_new;
last_success = success_new;
}
}
return sentinel.next;
}
/**
* Find the value for a textarea control.
*/
char *form_textarea_value(struct form_control *textarea)
{
unsigned int len = 1;
char *value, *s;
struct box *inline_container, *text_box;
/* find required length */
for (inline_container = textarea->box->children;
inline_container;
inline_container = inline_container->next) {
for (text_box = inline_container->children;
text_box;
text_box = text_box->next) {
len += text_box->length + 1;
}
len += 2;
}
/* construct value */
s = value = xcalloc(1, len);
for (inline_container = textarea->box->children;
inline_container;
inline_container = inline_container->next) {
for (text_box = inline_container->children;
text_box;
text_box = text_box->next) {
strncpy(s, text_box->text, text_box->length);
s += text_box->length;
*s++ = ' ';
}
*s++ = '\r';
*s++ = '\n';
}
*s = 0;
return value;
}
/**
* Encode controls using application/x-www-form-urlencoded.
*/
char *form_url_encode(struct form_successful_control *control)
{
char *s = xcalloc(1, 0);
unsigned int len = 0, len1;
for (; control; control = control->next) {
char *name = curl_escape(control->name, 0);
char *value = curl_escape(control->value, 0);
len1 = len + strlen(name) + strlen(value) + 2;
s = xrealloc(s, len1 + 1);
sprintf(s + len, "%s=%s&", name, value);
len = len1;
curl_free(name);
curl_free(value);
}
if (len)
s[len - 1] = 0;
return s;
}
/**
* Free a linked list of form_successful_control.
*/
void form_free_successful(struct form_successful_control *control)
{
struct form_successful_control *next;
for (; control; control = next) {
next = control->next;
free(control->name);
free(control->value);
free(control);
}
}