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);
 }
-