+htmlsafe(){
+ # escape HTML code from string
+
+ printf %s "$*" \
+ | sed 's;&;\&\;;g;
+ s;<;\<\;;g;
+ s;>;\>\;;g;
+ s;";\"\;;g;
+ s;/;\/\;;g;
+ s;'\'';\'\;;g;'
+}
+
+urlsafe(){
+ # Code every character in URL escape hex format
+ # except alphanumeric ascii
+
+ printf %s "$*" \
+ | hexdump -v -e '/1 ",%02X"' \
+ | tr , % \
+ | sed 's;%30;0;g; s;%31;1;g; s;%32;2;g; s;%33;3;g; s;%34;4;g; s;%35;5;g;
+ s;%36;6;g; s;%37;7;g; s;%38;8;g; s;%39;9;g;
+ s;%41;A;g; s;%42;B;g; s;%43;C;g; s;%44;D;g; s;%45;E;g; s;%46;F;g;
+ s;%47;G;g; s;%48;H;g; s;%49;I;g; s;%4A;J;g; s;%4B;K;g; s;%4C;L;g;
+ s;%4D;M;g; s;%4E;N;g; s;%4F;O;g; s;%50;P;g; s;%51;Q;g; s;%52;R;g;
+ s;%53;S;g; s;%54;T;g; s;%55;U;g; s;%56;V;g; s;%57;W;g; s;%58;X;g;
+ s;%59;Y;g; s;%5A;Z;g;
+ s;%61;a;g; s;%62;b;g; s;%63;c;g; s;%64;d;g; s;%65;e;g; s;%66;f;g;
+ s;%67;g;g; s;%68;h;g; s;%69;i;g; s;%6A;j;g; s;%6B;k;g; s;%6C;l;g;
+ s;%6D;m;g; s;%6E;n;g; s;%6F;o;g; s;%70;p;g; s;%71;q;g; s;%72;r;g;
+ s;%73;s;g; s;%74;t;g; s;%75;u;g; s;%76;v;g; s;%77;w;g; s;%78;x;g;
+ s;%79;y;g; s;%7A;z;g;'
+}
+
+attribsafe(){
+ # Code every character in HTML escape hex format
+ # except alphanumerig ascii
+