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form.c
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/*
* form.c -- Form processing (in-memory CGI) for the GoAhead Web server
*
* Copyright (c) GoAhead Software Inc., 1995-2000. All Rights Reserved.
*
* See the file "license.txt" for usage and redistribution license requirements
*
* $Id: form.c,v 1.3 2002/10/24 14:44:50 bporter Exp $
*/
/********************************** Description *******************************/
/*
* This module implements the /goform handler. It emulates CGI processing
* but performs this in-process and not as an external process. This enables
* a very high performance implementation with easy parsing and decoding
* of query strings and posted data.
*/
/*********************************** Includes *********************************/
#include "wsIntrn.h"
/************************************ Locals **********************************/
static sym_fd_t formSymtab = -1; /* Symbol table for form handlers */
/************************************* Code ***********************************/
/*
* Process a form request. Returns 1 always to indicate it handled the URL
*/
int websFormHandler(webs_t wp, char_t *urlPrefix, char_t *webDir, int arg,
char_t *url, char_t *path, char_t *query)
{
sym_t *sp;
char_t formBuf[FNAMESIZE];
char_t *cp, *formName;
int (*fn)(void *sock, char_t *path, char_t *args);
a_assert(websValid(wp));
a_assert(url && *url);
a_assert(path && *path == '/');
websStats.formHits++;
/*
* Extract the form name
*/
gstrncpy(formBuf, path, TSZ(formBuf));
if ((formName = gstrchr(&formBuf[1], '/')) == NULL) {
websError(wp, 200, T("Missing form name"));
return 1;
}
formName++;
if ((cp = gstrchr(formName, '/')) != NULL) {
*cp = '\0';
}
/*
* Lookup the C form function first and then try tcl (no javascript support
* yet).
*/
sp = symLookup(formSymtab, formName);
if (sp == NULL) {
websError(wp, 200, T("Form %s is not defined"), formName);
} else {
fn = (int (*)(void *, char_t *, char_t *)) sp->content.value.integer;
a_assert(fn);
if (fn) {
/*
* For good practice, forms must call websDone()
*/
(*fn)((void*) wp, formName, query);
/*
* Remove the test to force websDone, since this prevents
* the server "push" from a form>
*/
#if 0 /* push */
if (websValid(wp)) {
websError(wp, 200, T("Form didn't call websDone"));
}
#endif /* push */
}
}
return 1;
}
/******************************************************************************/
/*
* Define a form function in the "form" map space.
*/
int websFormDefine(char_t *name, void (*fn)(webs_t wp, char_t *path,
char_t *query))
{
a_assert(name && *name);
a_assert(fn);
if (fn == NULL) {
return -1;
}
symEnter(formSymtab, name, valueInteger((int) fn), (int) NULL);
return 0;
}
/******************************************************************************/
/*
* Open the symbol table for forms.
*/
void websFormOpen()
{
formSymtab = symOpen(WEBS_SYM_INIT);
}
/******************************************************************************/
/*
* Close the symbol table for forms.
*/
void websFormClose()
{
if (formSymtab != -1) {
symClose(formSymtab);
formSymtab = -1;
}
}
/******************************************************************************/
/*
* Write a webs header. This is a convenience routine to write a common
* header for a form back to the browser.
*/
void websHeader(webs_t wp)
{
a_assert(websValid(wp));
websWrite(wp, T("HTTP/1.0 200 OK\n"));
/*
* By license terms the following line of code must not be modified
*/
websWrite(wp, T("Server: %s\r\n"), WEBS_NAME);
websWrite(wp, T("Pragma: no-cache\n"));
websWrite(wp, T("Cache-control: no-cache\n"));
websWrite(wp, T("Content-Type: text/html\n"));
websWrite(wp, T("\n"));
websWrite(wp, T("<html>\n"));
}
/******************************************************************************/
/*
* Write a webs footer
*/
void websFooter(webs_t wp)
{
a_assert(websValid(wp));
websWrite(wp, T("</html>\n"));
}
/******************************************************************************/