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/* html.c -- html-related utilities.
$Id: html.c,v 1.5 1999/09/18 19:27:41 karl Exp $
Copyright (C) 1999 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "system.h"
#include "cmds.h"
#include "html.h"
#include "lang.h"
#include "makeinfo.h"
#include "sectioning.h"
/* See html.h. */
int html_output_head_p = 0;
void
html_output_head ()
{
char *html_title;
if (html_output_head_p)
return;
html_output_head_p = 1;
/* The <title> should not have markup. */
html_title = title ? text_expansion (title) : _("Untitled");
add_word_args ("<html lang=\"%s\"><head>\n<title>%s</title>\n",
language_table[language_code].abbrev, html_title);
add_word ("<meta http-equiv=\"Content-Type\" content=\"text/html");
if (document_encoding)
add_word_args ("; charset=%s", document_encoding);
add_word ("\">\n");
add_word_args ("<meta name=description content=\"%s\">\n", html_title);
add_word_args ("<meta name=generator content=\"makeinfo %s\">\n", VERSION);
add_word ("<link href=\"http://texinfo.org/\" rel=generator-home>\n");
add_word ("</head><body>\n\n");
}
/* Escape HTML special characters in the string if necessary,
returning a pointer to a possibly newly-allocated one. */
char *
escape_string (string)
char * string;
{
int i=0, newlen=0;
char * newstring;
do
{
/* Find how much to allocate. */
switch (string[i])
{
case '&':
newlen += 5; /* `&' */
break;
case '<':
case '>':
newlen += 4; /* `<', `>' */
break;
default:
newlen++;
}
i++;
}
while (string[i]);
if (newlen == i) return string; /* Already OK. */
newstring = xmalloc (newlen + 2);
i = 0;
do
{
switch (string[i])
{
case '&':
strcpy (newstring, "&");
newstring += 5;
break;
case '<':
strcpy (newstring, "<");
newstring += 4;
break;
case '>':
strcpy (newstring, ">");
newstring += 4;
break;
default:
newstring[0] = string[i];
newstring++;
}
}
while (string[i++]);
free (string);
return newstring - newlen -1;
}
/* Open or close TAG according to START_OR_END. */
void
insert_html_tag (start_or_end, tag)
int start_or_end;
char *tag;
{
if (!paragraph_is_open && (start_or_end == START))
{
/* Need to compensate for the <p> we are about to insert, or
else cm_xxx functions that call us will get wrong text
between START and END. */
adjust_braces_following (output_paragraph_offset, 3);
add_word ("<p>");
}
add_char ('<');
if (start_or_end != START)
add_char ('/');
add_word (tag);
add_char ('>');
}
/* Output an HTML <link> to the filename for NODE, including the
other string as extra attributes. */
void
add_link (node, attributes)
char *node, *attributes;
{
if (node)
{
add_word_args ("<link %s href=\"", attributes);
add_anchor_name (node, 1);
add_word ("\">\n");
}
}
/* Output NAME with characters escaped as appropriate for an anchor
name, i.e., escape URL special characters as %<n>. */
void
add_escaped_anchor_name (name)
char *name;
{
for (; *name; name++)
{
if (*name == '&')
add_word ("&");
else if (! URL_SAFE_CHAR (*name))
/* Cast so characters with the high bit set are treated as >128,
for example o-umlaut should be 246, not -10. */
add_word_args ("%%%x", (unsigned char) *name);
else
add_char (*name);
}
}
/* Insert the text for the name of a reference in an HTML anchor
appropriate for NODENAME. If HREF is nonzero, it will be
appropriate for a href= attribute, rather than name= i.e., including
the `#' if it's an internal reference. */
void
add_anchor_name (nodename, href)
char *nodename;
int href;
{
if (href)
add_char ('#');
add_escaped_anchor_name (nodename);
}
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