+/*
+ * Sort the list of online users by idle time.
+ * This function frees the supplied buffer, and returns a new one
+ * to the caller. The caller is responsible for freeing the returned buffer.
+ */
+char *SortOnlineUsers(char *listing) {
+ int rows;
+ char *sortbuf;
+ char *retbuf;
+ char buf[SIZ];
+ int i;
+
+ rows = num_tokens(listing, '\n');
+ sortbuf = malloc(rows * SIZ);
+ if (sortbuf == NULL) return(listing);
+ retbuf = malloc(rows * SIZ);
+ if (retbuf == NULL) {
+ free(sortbuf);
+ return(listing);
+ }
+
+ /* Copy the list into a fixed-record-size array for sorting */
+ for (i=0; i<rows; ++i) {
+ memset(buf, 0, SIZ);
+ extract_token(buf, listing, i, '\n');
+ memcpy(&sortbuf[i*SIZ], buf, SIZ);
+ }
+
+ /* Do the sort */
+ qsort(sortbuf, rows, SIZ, idlecmp);
+
+ /* Copy back to a \n delimited list */
+ strcpy(retbuf, "");
+ for (i=0; i<rows; ++i) {
+ strcat(retbuf, &sortbuf[i*SIZ]);
+ if (i<(rows-1)) strcat(retbuf, "\n");
+ }
+ return(retbuf);
+}