encoder support

common.tc

@@ -0,0 +1,46 @@
+//// You must free the result if result is non-NULL.
+//char *str_replace(char *orig, char *rep, char *with) {
+//    char *result; // the return string
+//    char *ins;    // the next insert point
+//    char *tmp;    // varies
+//    int len_rep;  // length of rep (the string to remove)
+//    int len_with; // length of with (the string to replace rep with)
+//    int len_front; // distance between rep and end of last rep
+//    int count;    // number of replacements
+
+//    // sanity checks and initialization
+//    if (!orig || !rep)
+//        return null;
+//    len_rep = len(rep);
+//    if (len_rep == 0)
+//        return null; // empty rep causes infinite loop during count
+//    if (!with)
+//        with = "";
+//    len_with = len(with);
+
+//    // count the number of replacements needed
+//    ins = orig;
+//    for (count = 0; tmp = instr(ins, rep); ++count) {
+//        ins = tmp + len_rep;
+//    }
+
+//    tmp = result = malloc(len(orig) + (len_with - len_rep) * count + 1);
+
+//    if (!result)
+//        return null;
+
+//    // first time through the loop, all the variable are set correctly
+//    // from here on,
+//    //    tmp points to the end of the result string
+//    //    ins points to the next occurrence of rep in orig
+//    //    orig points to the remainder of orig after "end of rep"
+//    while (count--) {
+//        ins = instr(orig, rep);
+//        len_front = ins - orig;
+//        tmp = mid(tmp, orig, len_front) + len_front;
+//        tmp = strcpy(tmp, with) + len_with;
+//        orig += len_front + len_rep; // move to next "end of rep"
+//    }
+//    strcpy(tmp, orig);
+//    return result;
+//}