thttpunesc.c - plan9port - [fork] Plan 9 from user space
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       ---
       thttpunesc.c (888B)
       ---
            1 #include <u.h>
            2 #include <libc.h>
            3 #include <bin.h>
            4 #include <httpd.h>
            5 
            6 /*
            7  *  go from http with latin1 escapes to utf,
            8  *  we assume that anything >= Runeself is already in utf
            9  */
           10 char *
           11 httpunesc(HConnect *cc, char *s)
           12 {
           13         char *t, *v;
           14         int c;
           15         Htmlesc *e;
           16 
           17         v = halloc(cc, UTFmax*strlen(s) + 1);
           18         for(t = v; c = *s;){
           19                 if(c == '&'){
           20                         if(s[1] == '#' && s[2] && s[3] && s[4] && s[5] == ';'){
           21                                 c = atoi(s+2);
           22                                 if(c < Runeself){
           23                                         *t++ = c;
           24                                         s += 6;
           25                                         continue;
           26                                 }
           27                                 if(c < 256 && c >= 161){
           28                                         e = &htmlesc[c-161];
           29                                         t += runetochar(t, &e->value);
           30                                         s += 6;
           31                                         continue;
           32                                 }
           33                         } else {
           34                                 for(e = htmlesc; e->name != nil; e++)
           35                                         if(strncmp(e->name, s, strlen(e->name)) == 0)
           36                                                 break;
           37                                 if(e->name != nil){
           38                                         t += runetochar(t, &e->value);
           39                                         s += strlen(e->name);
           40                                         continue;
           41                                 }
           42                         }
           43                 }
           44                 *t++ = c;
           45                 s++;
           46         }
           47         *t = 0;
           48         return v;
           49 }