1 files changed, 94 insertions, 0 deletions
diff --git a/functions.c b/functions.c
index 6034250..ffd94f1 100644
--- a/functions.c
+++ b/functions.c
@@ -1,5 +1,50 @@
 #include "functions.h"
 
+// Internal function just to replace nick in server greeting strings
+// (as in ":servername 00x oldnick :Blablabla" -> ":servername 00x newnick :Blablabla")
+void updategreetingnick(char *greeting, char *greetingnum, char *newnick, char *oldnick) {
+  printf("updategreetingnick(): '%s' '%s' '%s' '%s'.\n", greeting, greetingnum, newnick, oldnick);
+
+  // Find the position of the old nick in the current greeting
+  char searchstr[MAXDATASIZE];
+  snprintf(searchstr, MAXDATASIZE, " %s %s :", greetingnum, oldnick);
+  char *ret;
+  ret = strstr(greeting, searchstr);
+
+  // If ret not found, try again without the colon (e.g. for greeting 004)
+  if (ret == NULL) {
+    snprintf(searchstr, MAXDATASIZE, " %s %s ", greetingnum, oldnick);
+    ret = strstr(greeting, searchstr);
+  }
+
+  // If ret *still* not found, abandon ship
+  if (ret == NULL) {
+    printf("Error updating greeting string, substring not found.  Exiting!\n");
+    exit(1);
+  }
+
+  int pos = ret - greeting + 5; // +5 for " 001 "
+
+  // Copy the start of the old greeting into a new string
+  char greetingtmp[MAXDATASIZE];
+  strncpy(greetingtmp, greeting, pos);
+  // Terminate it
+  greetingtmp[pos] = '\0';
+
+  // Now smash everything (start of old greeting + new nick + remainder of old greeting)
+  // together into the new greeting, put in a new temporary string
+  char greetingtmp2[MAXDATASIZE];
+  if (!snprintf(greetingtmp2, MAXDATASIZE, "%s%s %s", greetingtmp, newnick, greeting + pos + strlen(oldnick) + 1)) {
+    fprintf(stderr, "Error while preparing new greeting string!\n");
+    exit(1);
+  }
+
+  // And finally copy back to source string
+  strcpy(greeting, greetingtmp2);
+
+  printf("updategreetingnick(): Built new greeting '%s' '%s', length '%ld'.\n", greetingnum, greeting, strlen(greeting));
+}
+
 // Get stdin line with buffer overrun protection
 int getstdin(char *prompt, char *buff, size_t sz) {
   int ch, extra;
@@ -182,3 +227,52 @@ void updatenickuserhost(char *nickuserhost, char *nick) {
 
   printf("updatenickuserhost(): new nickuserhost '%s', length '%ld'.\n", nickuserhost, strlen(nickuserhost));
 }
+
+// Update existing greeting strings with a new nickuserhost and new nick
+void updategreetings(char *greeting001, char *greeting002, char *greeting003, char *greeting004, char *newnickuserhost, char *oldnickuserhost, char *newnick, char *oldnick) {
+  printf("updategreetings(): updating greetings with new nickuserhost '%s' and nick '%s'.\n", newnickuserhost, newnick);
+
+  // nickuserhost and greeting001's final component first
+  // (final component as in ":servername 001 nick :Blablabla final!com@ponent"
+
+  // Make copies of the nickuserhosts to work with
+  char newnickuserhostcpy[MAXDATASIZE];
+  strcpy(newnickuserhostcpy, newnickuserhost);
+  stripprefix(newnickuserhostcpy);
+  char oldnickuserhostcpy[MAXDATASIZE];
+  strcpy(oldnickuserhostcpy, oldnickuserhost);
+  stripprefix(oldnickuserhostcpy);
+
+  // Find the position of the old nickuserhost in the current greeting 001
+  char *ret;
+  ret = strstr(greeting001, oldnickuserhostcpy);
+  int pos = ret - greeting001;
+
+  // Terminate greeting001 where the nickuserhost begins
+  greeting001[pos] = '\0';
+
+  // Stick the new nickuserhost in place in a temporary greeting 001 string
+  char greetingtmp[MAXDATASIZE];
+  snprintf(greetingtmp, MAXDATASIZE, "%s%s", greeting001, newnickuserhostcpy);
+
+  // Terminate it
+  greetingtmp[pos + strlen(newnickuserhostcpy)] = '\0';
+
+  // Copy back to source greeting 001
+  strcpy(greeting001, greetingtmp);
+
+  printf("updategreetings(): new greeting 001 '%s', length '%ld'.\n", greeting001, strlen(greeting001));
+
+  // Get the new nick
+
+  char newnickcpy[MAXDATASIZE];
+  strcpy(newnickcpy, newnick);
+  extractnickfromprefix(newnickcpy);
+
+  // greeting nicks next
+  // (as in ":servername 00x oldnick :Blablabla" -> ":servername 00x newnick :Blablabla")
+  updategreetingnick(greeting001, "001", newnickcpy, oldnick);
+  updategreetingnick(greeting002, "002", newnickcpy, oldnick);
+  updategreetingnick(greeting003, "003", newnickcpy, oldnick);
+  updategreetingnick(greeting004, "004", newnickcpy, oldnick);
+}