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/*
* "$Id: html.c 8278 2009-01-22 20:35:12Z mike $"
*
* HTML support functions for the Common UNIX Printing System (CUPS).
*
* Copyright 2007-2009 by Apple Inc.
* Copyright 1997-2006 by Easy Software Products.
*
* These coded instructions, statements, and computer programs are the
* property of Apple Inc. and are protected by Federal copyright
* law. Distribution and use rights are outlined in the file "LICENSE.txt"
* which should have been included with this file. If this file is
* file is missing or damaged, see the license at "http://www.cups.org/".
*
* Contents:
*
* cgiEndHTML() - End a HTML page.
* cgiEndMultipart() - End the delivery of a multipart web page.
* cgiFormEncode() - Encode a string as a form variable.
* cgiStartHTML() - Start a HTML page.
* cgiStartMultipart() - Start a multipart delivery of a web page.
* cgiSupportsMultipart() - Does the browser support multi-part documents?
* cgi_null_passwd() - Return a NULL password for authentication.
*/
/*
* Include necessary headers...
*/
#include "cgi-private.h"
/*
* Local globals...
*/
static const char *cgi_multipart = NULL;
/* Multipart separator, if any */
/*
* Local functions...
*/
static const char *cgi_null_passwd(const char *prompt);
/*
* 'cgiEndHTML()' - End a HTML page.
*/
void
cgiEndHTML(void)
{
/*
* Send the standard trailer...
*/
cgiCopyTemplateLang("trailer.tmpl");
}
/*
* 'cgiEndMultipart()' - End the delivery of a multipart web page.
*/
void
cgiEndMultipart(void)
{
if (cgi_multipart)
{
printf("\n%s--\n", cgi_multipart);
fflush(stdout);
}
}
/*
* 'cgiFormEncode()' - Encode a string as a form variable.
*/
char * /* O - Destination string */
cgiFormEncode(char *dst, /* I - Destination string */
const char *src, /* I - Source string */
size_t dstsize) /* I - Size of destination string */
{
char *dstptr, /* Pointer into destination */
*dstend; /* End of destination */
static const char *hex = /* Hexadecimal characters */
"0123456789ABCDEF";
/*
* Mark the end of the string...
*/
dstend = dst + dstsize - 1;
/*
* Loop through the source string and copy...
*/
for (dstptr = dst; *src && dstptr < dstend;)
{
switch (*src)
{
case ' ' :
/*
* Encode spaces with a "+"...
*/
*dstptr++ = '+';
src ++;
break;
case '&' :
case '%' :
case '+' :
/*
* Encode special characters with %XX escape...
*/
if (dstptr < (dstend - 2))
{
*dstptr++ = '%';
*dstptr++ = hex[(*src & 255) >> 4];
*dstptr++ = hex[*src & 15];
src ++;
}
break;
default :
/*
* Copy other characters literally...
*/
*dstptr++ = *src++;
break;
}
}
/*
* Nul-terminate the destination string...
*/
*dstptr = '\0';
/*
* Return the encoded string...
*/
return (dst);
}
/*
* 'cgiStartHTML()' - Start a HTML page.
*/
void
cgiStartHTML(const char *title) /* I - Title of page */
{
/*
* Disable any further authentication attempts...
*/
cupsSetPasswordCB(cgi_null_passwd);
/*
* Tell the client to expect UTF-8 encoded HTML...
*/
if (cgi_multipart)
puts(cgi_multipart);
puts("Content-Type: text/html;charset=utf-8\n");
/*
* Send a standard header...
*/
cgiSetVariable("TITLE", title);
cgiSetServerVersion();
cgiCopyTemplateLang("header.tmpl");
}
/*
* 'cgiStartMultipart()' - Start a multipart delivery of a web page.
*/
void
cgiStartMultipart(void)
{
puts("MIME-Version: 1.0\n"
"Content-Type: multipart/x-mixed-replace; boundary=\"CUPS-MULTIPART\"\n");
fflush(stdout);
cgi_multipart = "--CUPS-MULTIPART";
}
/*
* 'cgiSupportsMultipart()' - Does the browser support multi-part documents?
*/
int /* O - 1 if multi-part supported, 0 otherwise */
cgiSupportsMultipart(void)
{
const char *user_agent; /* User-Agent string */
static int supports_multipart = -1;/* Cached value */
if (supports_multipart < 0)
{
/*
* CUPS STR #3049: Apparently some browsers don't support multi-part
* documents, which makes them useless for many web sites. Rather than
* abandoning those users, we'll offer a degraded single-part mode...
*
* Currently we know that anything based on Gecko, MSIE, and Safari all
* work. We'll add more as they are reported/tested.
*/
if ((user_agent = getenv("HTTP_USER_AGENT")) != NULL &&
(strstr(user_agent, " Gecko/") != NULL ||
strstr(user_agent, " MSIE ") != NULL ||
strstr(user_agent, " Safari/") != NULL))
supports_multipart = 1;
else
supports_multipart = 0;
}
return (supports_multipart);
}
/*
* 'cgi_null_passwd()' - Return a NULL password for authentication.
*/
static const char * /* O - NULL */
cgi_null_passwd(const char *prompt) /* I - Prompt string (unused) */
{
(void)prompt;
fprintf(stderr, "DEBUG: cgi_null_passwd(prompt=\"%s\") called!\n",
prompt ? prompt : "(null)");
return (NULL);
}
/*
* End of "$Id: html.c 8278 2009-01-22 20:35:12Z mike $".
*/
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