r2741: Start migration to pathname-less asd files, remove .system files

[clsql.git] / base / utils.cl

diff --git a/base/utils.cl b/base/utils.cl
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+++ b/base/utils.cl
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+;;;; -*- Mode: LISP; Syntax: ANSI-Common-Lisp; Base: 10 -*-
+;;;; *************************************************************************
+;;;; FILE IDENTIFICATION
+;;;;
+;;;; Name:         utils.cl
+;;;; Purpose:      SQL utility functions
+;;;; Programmer:   Kevin M. Rosenberg
+;;;; Date Started: Mar 2002
+;;;;
+;;;; $Id: utils.cl,v 1.6 2002/09/17 17:16:43 kevin Exp $
+;;;;
+;;;; This file, part of CLSQL, is Copyright (c) 2002 by Kevin M. Rosenberg
+;;;;
+;;;; CLSQL users are granted the rights to distribute and use this software
+;;;; as governed by the terms of the Lisp Lesser GNU Public License
+;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
+;;;; *************************************************************************
+
+(declaim (optimize (debug 3) (speed 3) (safety 1) (compilation-speed 0)))
+(in-package :clsql-base-sys)
+
+(defun number-to-sql-string (num)
+  (etypecase num
+    (integer
+     num)
+    (rational
+     (float-to-sql-string (coerce num 'double-float)))
+    (number
+     (float-to-sql-string num))))
+
+(defun float-to-sql-string (num)
+  "Convert exponent character for SQL"
+  (substitute #\e #\f (substitute #\e #\d (write-to-string num :readably t))))
+
+(defun sql-escape (identifier)
+  "Change hyphens to underscores, ensure string"
+  (let* ((unescaped (etypecase identifier
+                      (symbol (symbol-name identifier))
+                      (string identifier)))
+         (escaped (make-string (length unescaped))))
+    (dotimes (i (length unescaped))
+      (setf (char escaped i)
+            (cond ((equal (char unescaped i) #\-)
+                   #\_)
+                  ;; ...
+                  (t
+                   (char unescaped i)))))
+    escaped))
+
+
+(defun sql-escape-quotes (s)
+  "Escape quotes for SQL string writing"
+  (substitute-string-for-char s #\' "''"))
+
+(defun substitute-string-for-char (procstr match-char subst-str) 
+"Substitutes a string for a single matching character of a string"
+  (let ((pos (position match-char procstr)))
+    (if pos
+       (concatenate 'string
+         (subseq procstr 0 pos) subst-str
+         (substitute-string-for-char 
+          (subseq procstr (1+ pos)) match-char subst-str))
+      procstr)))
+
+