cdr_pgsql, cel_pgsql: Store maximum buffer size to prevent reallocation

The code previously used a fixed size of 512 for the SQL
queries. Depending on the size this may require it to grow.

This change makes it so if the buffer size does grow the size
is stored and next time the buffer will be large enough.

Change-Id: I55385899f1c06dee47e4274c2d21538037b2d895

cdr/cdr_pgsql.c

@@ -75,6 +75,7 @@ static char *encoding;
 static char *tz;
 
 static int connected = 0;
+/* Optimization to reduce number of memory allocations */
 static int maxsize = 512, maxsize2 = 512;
 static time_t connect_time = 0;
 static int totalrecords = 0;
@@ -453,6 +454,15 @@ static int pgsql_log(struct ast_cdr *cdr)
 			records++;
 		}
 		PQclear(result);
+
+		/* Next time, just allocate buffers that are that big to start with. */
+		if (ast_str_strlen(sql) > maxsize) {
+			maxsize = ast_str_strlen(sql);
+		}
+		if (ast_str_strlen(sql2) > maxsize2) {
+			maxsize2 = ast_str_strlen(sql2);
+		}
+
 		ast_free(sql);
 		ast_free(sql2);
 	}

cel/cel_pgsql.c

@@ -71,6 +71,7 @@ static char *pgdbport;
 static char *table;
 
 static int connected = 0;
+/* Optimization to reduce number of memory allocations */
 static int maxsize = 512, maxsize2 = 512;
 static int usegmtime = 0;
 
@@ -372,6 +373,14 @@ static void pgsql_log(struct ast_event *event)
 		}
 		PQclear(result);
 
+		/* Next time, just allocate buffers that are that big to start with. */
+		if (ast_str_strlen(sql) > maxsize) {
+			maxsize = ast_str_strlen(sql);
+		}
+		if (ast_str_strlen(sql2) > maxsize2) {
+			maxsize2 = ast_str_strlen(sql2);
+		}
+
 ast_log_cleanup:
 		ast_free(sql);
 		ast_free(sql2);