Backported bug fix for #2956.

src/interfaces/ecpg/ecpglib/execute.c

@@ -1,4 +1,4 @@
-/* $PostgreSQL: pgsql/src/interfaces/ecpg/ecpglib/execute.c,v 1.43.2.9 2007/02/06 09:41:52 meskes Exp $ */
+/* $PostgreSQL: pgsql/src/interfaces/ecpg/ecpglib/execute.c,v 1.43.2.10 2007/02/27 13:27:05 meskes Exp $ */
 
 /*
  * The aim is to get a simpler inteface to the database routines.
@@ -38,27 +38,45 @@
 static char *
 quote_postgres(char *arg, int lineno)
 {
-	char	   *res = (char *) ECPGalloc(2 * strlen(arg) + 3, lineno);
+	char	*res;
-	int			i,
+	int	error;
-				ri = 0;
+	size_t  length;
+	size_t  escaped_len;
+	size_t  buffer_len;
 
+	/*
+	 * if quote is false we just need to store things in a descriptor they
+	 * will be quoted once they are inserted in a statement
+	 */
+	length = strlen(arg);
+	buffer_len = 2 * length + 1;
+	res = (char *) ECPGalloc(buffer_len + 3, lineno);
 	if (!res)
 		return (res);
 
-	if (strchr(arg, '\\') != NULL)
+	error = 0;
-		res[ri++] = ESCAPE_STRING_SYNTAX;
+	escaped_len = PQescapeString(res+1, arg, buffer_len);
-	res[ri++] = '\'';
+	if (error)
-
-	for (i = 0; arg[i]; i++, ri++)
 	{
-		if (SQL_STR_DOUBLE(arg[i]))
+		ECPGfree(res);
-			res[ri++] = arg[i];
+		return NULL;
-		res[ri] = arg[i];
+	}
+	if (length == escaped_len)
+	{
+		res[0] = res[escaped_len+1] = '\'';
+		res[escaped_len+2] = '\0';
+	}
+	else
+	{
+		/* 
+		 * We don't know if the target database is using
+		 * standard_conforming_strings, so we always use E'' strings.
+		 */
+		memmove(res+2, res+1, escaped_len);
+		res[0] = ESCAPE_STRING_SYNTAX;
+		res[1] = res[escaped_len+2] = '\'';
+		res[escaped_len+3] = '\0';
 	}
-
-	res[ri++] = '\'';
-	res[ri] = '\0';
-
 	ECPGfree(arg);
 	return res;
 }