[PATCH 3/8] Skip forbidden characters.

[John Keeping]

On Tue, Jul 01, 2014 at 09:40:28AM +0200, zwinkau at kit.edu wrote:
> From: Sebastian Buchwald <Sebastian.Buchwald at kit.edu>

Why do we want to do this?  Does it not break anything that uses
whitespace="pre" (explicitly or implicitly)?

> ---
>  html.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/html.c b/html.c
> index 91047ad..6037eec 100644
> --- a/html.c
> +++ b/html.c
> @@ -129,7 +129,8 @@ void html_txt(const char *txt)
>  	const char *t = txt;
>  	while (t && *t) {
>  		int c = *t;
> -		if (c == '<' || c == '>' || c == '&') {
> +		if ((c < 0x20 && c != '\t' && c != '\n' && c != '\r')
> +				|| (c == '<' || c == '>' || c == '&')) {
>  			html_raw(txt, t - txt);
>  			if (c == '>')
>  				html(">");
> @@ -150,7 +151,8 @@ void html_ntxt(int len, const char *txt)
>  	const char *t = txt;
>  	while (t && *t && len--) {
>  		int c = *t;
> -		if (c == '<' || c == '>' || c == '&') {
> +		if ((c < 0x20 && c != '\t' && c != '\n' && c != '\r')
> +				|| (c == '<' || c == '>' || c == '&')) {
>  			html_raw(txt, t - txt);
>  			if (c == '>')
>  				html(">");
> @@ -186,7 +188,8 @@ void html_attr(const char *txt)
>  	const char *t = txt;
>  	while (t && *t) {
>  		int c = *t;
> -		if (c == '<' || c == '>' || c == '\'' || c == '\"' || c == '&') {
> +		if (c == '<' || c == '>' || c == '\'' || c == '\"' || c == '&'
> +				|| (c < 0x20 && c != '\t' && c != '\n' && c != '\r')) {
>  			html_raw(txt, t - txt);
>  			if (c == '>')
>  				html(">");