add libhttpd

src/libhttpd/httpunesc.c

@@ -0,0 +1,49 @@
+#include <u.h>
+#include <libc.h>
+#include <bin.h>
+#include <httpd.h>
+
+/*
+ *  go from http with latin1 escapes to utf,
+ *  we assume that anything >= Runeself is already in utf
+ */
+char *
+httpunesc(HConnect *cc, char *s)
+{
+	char *t, *v;
+	int c;
+	Htmlesc *e;
+
+	v = halloc(cc, UTFmax*strlen(s) + 1);
+	for(t = v; c = *s;){
+		if(c == '&'){
+			if(s[1] == '#' && s[2] && s[3] && s[4] && s[5] == ';'){
+				c = atoi(s+2);
+				if(c < Runeself){
+					*t++ = c;
+					s += 6;
+					continue;
+				}
+				if(c < 256 && c >= 161){
+					e = &htmlesc[c-161];
+					t += runetochar(t, &e->value);
+					s += 6;
+					continue;
+				}
+			} else {
+				for(e = htmlesc; e->name != nil; e++)
+					if(strncmp(e->name, s, strlen(e->name)) == 0)
+						break;
+				if(e->name != nil){
+					t += runetochar(t, &e->value);
+					s += strlen(e->name);
+					continue;
+				}
+			}
+		}
+		*t++ = c;
+		s++;
+	}
+	*t = 0;
+	return v;
+}