turlunesc.c - plan9port - [fork] Plan 9 from user space
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       ---
       turlunesc.c (995B)
       ---
            1 #include <u.h>
            2 #include <libc.h>
            3 #include <bin.h>
            4 #include <httpd.h>
            5 
            6 /* go from url with escaped utf to utf */
            7 char *
            8 hurlunesc(HConnect *cc, char *s)
            9 {
           10         char *t, *v, *u;
           11         Rune r;
           12         int c, n;
           13 
           14         /* unescape */
           15         u = halloc(cc, strlen(s)+1);
           16         for(t = u; c = *s; s++){
           17                 if(c == '%'){
           18                         n = s[1];
           19                         if(n >= '0' && n <= '9')
           20                                 n = n - '0';
           21                         else if(n >= 'A' && n <= 'F')
           22                                 n = n - 'A' + 10;
           23                         else if(n >= 'a' && n <= 'f')
           24                                 n = n - 'a' + 10;
           25                         else
           26                                 break;
           27                         r = n;
           28                         n = s[2];
           29                         if(n >= '0' && n <= '9')
           30                                 n = n - '0';
           31                         else if(n >= 'A' && n <= 'F')
           32                                 n = n - 'A' + 10;
           33                         else if(n >= 'a' && n <= 'f')
           34                                 n = n - 'a' + 10;
           35                         else
           36                                 break;
           37                         s += 2;
           38                         c = (r<<4)+n;
           39                 }
           40                 *t++ = c;
           41         }
           42         *t = '\0';
           43 
           44         /* convert to valid utf */
           45         v = halloc(cc, UTFmax*strlen(u) + 1);
           46         s = u;
           47         t = v;
           48         while(*s){
           49                 /* in decoding error, assume latin1 */
           50                 if((n=chartorune(&r, s)) == 1 && r == Runeerror)
           51                         r = (uchar)*s;
           52                 s += n;
           53                 t += runetochar(t, &r);
           54         }
           55         *t = '\0';
           56 
           57         return v;
           58 }