1 files changed, 77 insertions, 0 deletions
diff --git a/functions.c b/functions.c
index 97f8629..86a1f03 100644
--- a/functions.c
+++ b/functions.c
@@ -50,3 +50,80 @@ void appendcrlf(char *string) {
   string[startlen + 1] = '\n'; // Add LF
   string[startlen + 2] = '\0'; // Finish with null terminator
 }
+
+// Remove leading colon ':' which is the starting character of a prefix in an IRC message
+void stripprefix(char *string) {
+  // Make a copy to work with
+  char string2[strlen(string)];
+
+  printf("stripprefix(): starting with '%s', strlen: %zd.\n", string, strlen(string));
+
+  // Don't bother if this isn't a prefix with a leading ':'
+  if (string[0] != ':') {
+    printf("stripprefix(): no leading ':', returning.\n");
+    return;
+  }
+
+  // Copy the old string into a new one, but...
+  for (size_t i = 1; i < strlen(string); i++) {
+    printf("i: %zd.  strlen: %zd.\n", i, strlen(string));
+    string2[i - 1] = string[i];
+  }
+
+  // Copy result back to original string
+  strncpy(string, string2, strlen(string) - 1);
+
+  // Finish with null terminator
+  string[strlen(string) - 1] = '\0';
+
+  printf("stripprefix(): finishing with '%s', strlen: %zd.\n", string, strlen(string));
+}
+
+// Extract final parameter from IRC message, removing the leading colon ':'
+// e.g. given this string:
+// ":irc.tghost.co.uk 332 blabounce #test :This is a test topic!"
+// We want to end up with:
+// "This is a test topic!"
+void extractfinalparameter(char *string) {
+  // Make a copy to work with
+  char string2[strlen(string)];
+
+  // Position of colon
+  int colonpos = -1;
+
+  printf("extractfinalparameter(): starting with '%s', strlen: %zd.\n", string, strlen(string));
+
+  // Strip the colon at position 0 if there is one
+  stripprefix(string);
+
+  // Find the colon
+  for (size_t i = 0; i < strlen(string); i++) {
+    printf("i: %zd.  strlen: %zd.\n", i, strlen(string));
+    if (string[i] == ':') {
+      printf("Found colon at position %zd!\n", i);
+      colonpos = i;
+      break;
+    }
+  }
+
+  if (colonpos == -1) {
+    printf("no colon found, returning\n");
+    return;
+  }
+
+  // Build a new string starting from the next position after the colon
+  int counter = 0;
+  for (size_t i = colonpos + 1; i < strlen(string); i++) {
+    printf("i: %zd.  strlen: %zd.\n", i, strlen(string));
+    string2[counter] = string[i];
+    counter++;
+  }
+
+  // Copy result back to original string
+  strncpy(string, string2, counter);
+
+  // Finish with null terminator
+  string[counter] = '\0';
+
+  printf("extractfinalparameter(): finishing with '%s', strlen: %zd.\n", string, strlen(string));
+}