Fixed mini_2047_decode() in textclient. It ... actually works now.

[citadel.git] / textclient / messages.c

diff --git a/textclient/messages.c b/textclient/messages.c
index 447c3922567378a14473de3596961cc99c002183..df99e3362a092d93de27102c41fe4dba50d7cd91 100644 (file)
--- a/textclient/messages.c
+++ b/textclient/messages.c
@@ -340,50 +340,60 @@ void free_parts(struct parts *p)
 /*
  * This is a mini RFC2047 decoder.
  * It only handles strings encoded from UTF-8 as Quoted-printable.
+ * We can do this "in place" because the converted string will always be smaller than the source string.
  */
 void mini_2047_decode(char *s)
 {
-       if (!s)
+       if (!s) {                                               // no null strings allowed!
                return;
+       }
 
-       char *qstart = strstr(s, "=?UTF-8?Q?");
-       if (!qstart)
+       char *qstart = strstr(s, "=?UTF-8?Q?");                 // Must start with this string
+       if (!qstart) {
                return;
+       }
 
-       char *qend = strstr(s, "?=");
-       if (!qend)
+       char *qend = strstr(qstart+10, "?=");                   // Must end with this string
+       if (!qend) {
                return;
+       }
 
-       if (qend <= qstart)
+       if (qend <= qstart) {                                   // And there must be something in between them.
                return;
+       }
 
-       strcpy(qstart, &qstart[10]);
-       qend -= 10;
+       // The string has qualified for conversion.
 
-       char *p = qstart;
-       while (p < qend) {
+       strcpy(qend, "");                                       // Strip the trailer
+       strcpy(qstart, &qstart[10]);                            // Strip the header
 
-               if (p[0] == '=') {
+       char *r = qstart;                                       // Pointer to where in the string we're reading
+       char *w = s;                                            // Pointer to where in the string we're writing
 
+       while(*r) {                                             // Loop through the source string
+               if (r[0] == '=') {                              // "=" means read a hex character
                        char ch[3];
-                       ch[0] = p[1];
-                       ch[1] = p[2];
-                       ch[2] = p[3];
+                       ch[0] = r[1];
+                       ch[1] = r[2];
+                       ch[2] = r[3];
                        int c;
                        sscanf(ch, "%02x", &c);
-                       p[0] = c;
-                       strcpy(&p[1], &p[3]);
-                       qend -= 2;
+                       w[0] = c;
+                       r += 3;
+                       ++w;
                }
-
-               if (p[0] == '_') {
-                       p[0] = ' ';
+               else if (r[0] == '_') {                         // "_" is a space
+                       w[0] = ' ';
+                       ++r;
+                       ++w;
+               }
+               else {                                          // anything else pass through literally
+                       w[0] = r[0];
+                       ++r;
+                       ++w;
                }
-
-               ++p;
        }
-
-       strcpy(qend, &qend[2]);
+       w[0] = 0;                                               // null terminate
 }
 
 
@@ -583,6 +593,7 @@ int read_message(CtdlIPC *ipc,
                                color(BRIGHT_CYAN);
                                mini_2047_decode(message->subject);
                                scr_printf("%s\n", message->subject);
+
                        }
                }
        }