Data commit

Task/URL-decoding/AWK/url-decoding-1.awk

@@ -0,0 +1,22 @@
+# syntax:
+awk '
+BEGIN {
+    str = "http%3A%2F%2Ffoo%20bar%2F" # "http://foo bar/"
+    printf("%s\n",str)
+    len=length(str)
+    for (i=1;i<=len;i++) {
+      if ( substr(str,i,1) == "%") {
+        L = substr(str,1,i-1) # chars to left of "%"
+        M = substr(str,i+1,2) # 2 chars to right of "%"
+        R = substr(str,i+3)   # chars to right of "%xx"
+        str = sprintf("%s%c%s",L,hex2dec(M),R)
+      }
+    }
+    printf("%s\n",str)
+    exit(0)
+}
+function hex2dec(s,  num) {
+    num = index("0123456789ABCDEF",toupper(substr(s,length(s)))) - 1
+    sub(/.$/,"",s)
+    return num + (length(s) ? 16*hex2dec(s) : 0)
+} '