Test for NULL-pointers in html_txt() and friends

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

1 files changed, 3 insertions, 4 deletions

diff --git a/html.c b/html.c
index 957b326..3a5d28d 100644
--- a/html.c
+++ b/html.c
@@ -40,17 +40,17 @@ void htmlf(const char *format, ...)
 	vsnprintf(buf, sizeof(buf), format, args);
 	va_end(args);
 	html(buf);
 }
 
 void html_txt(char *txt)
 {
 	char *t = txt;
-	while(*t){
+	while(t && *t){
 		int c = *t;
 		if (c=='<' || c=='>' || c=='&') {
 			*t = '\0';
 			html(txt);
 			*t = c;
 			if (c=='>')
 				html("&gt;");
 			else if (c=='<')
@@ -63,17 +63,17 @@ void html_txt(char *txt)
 	}
 	if (t!=txt)
 		html(txt);
 }
 
 void html_ntxt(int len, char *txt)
 {
 	char *t = txt;
-	while(*t && len--){
+	while(t && *t && len--){
 		int c = *t;
 		if (c=='<' || c=='>' || c=='&') {
 			*t = '\0';
 			html(txt);
 			*t = c;
 			if (c=='>')
 				html("&gt;");
 			else if (c=='<')
@@ -92,17 +92,17 @@ void html_ntxt(int len, char *txt)
 	}
 	if (len<0)
 		html("...");
 }
 
 void html_attr(char *txt)
 {
 	char *t = txt;
-	while(*t){
+	while(t && *t){
 		int c = *t;
 		if (c=='<' || c=='>' || c=='\'') {
 			*t = '\0';
 			html(txt);
 			*t = c;
 			if (c=='>')
 				html("&gt;");
 			else if (c=='<')
@@ -150,9 +150,8 @@ void html_filemode(unsigned short mode)
 	else if (S_ISLNK(mode))
 		html("l");
 	else
 		html("-");
 	html_fileperm(mode >> 6);
 	html_fileperm(mode >> 3);
 	html_fileperm(mode);
 }
-