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|
/*
+----------------------------------------------------------------------+
| Copyright (c) The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| https://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Calvin Buckley <calvin@cmpct.info> |
+----------------------------------------------------------------------+
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "php.h"
/*
* This files contains functions shared between ext/pdo_odbc and ext/odbc,
* relating to i.e. connection string quoting rules.
*
* The declarations are PHPAPI due to being available for shared/static
* versions.
*/
/**
* Determines if a string matches the ODBC quoting rules.
*
* A valid quoted string begins with a '{', ends with a '}', and has no '}'
* inside of the string that aren't repeated (as to be escaped).
*
* These rules are what .NET also follows.
*/
PHPAPI bool php_odbc_connstr_is_quoted(const char *str)
{
/* ODBC quotes are curly braces */
if (str[0] != '{') {
return false;
}
/* Check for } that aren't doubled up or at the end of the string */
size_t length = strlen(str);
for (size_t i = 0; i < length; i++) {
if (str[i] == '}' && str[i + 1] == '}') {
/* Skip over so we don't count it again */
i++;
} else if (str[i] == '}' && str[i + 1] != '\0') {
/* If not at the end, not quoted */
return false;
}
}
return true;
}
/**
* Determines if a value for a connection string should be quoted.
*
* The ODBC specification mentions:
* "Because of connection string and initialization file grammar, keywords and
* attribute values that contain the characters []{}(),;?*=!@ not enclosed
* with braces should be avoided."
*
* Note that it assumes that the string is *not* already quoted. You should
* check beforehand.
*/
PHPAPI bool php_odbc_connstr_should_quote(const char *str)
{
return strpbrk(str, "[]{}(),;?*=!@") != NULL;
}
/**
* Estimates the worst-case scenario for a quoted version of a string's size.
*/
PHPAPI size_t php_odbc_connstr_estimate_quote_length(const char *in_str)
{
/* Assume all '}'. Include '{,' '}', and the null terminator too */
return (strlen(in_str) * 2) + 3;
}
/**
* Quotes a string with ODBC rules.
*
* Some characters (curly braces, semicolons) are special and must be quoted.
* In the case of '}' in a quoted string, they must be escaped SQL style; that
* is, repeated.
*/
PHPAPI size_t php_odbc_connstr_quote(char *out_str, const char *in_str, size_t out_str_size)
{
*out_str++ = '{';
out_str_size--;
while (out_str_size > 2) {
if (*in_str == '\0') {
break;
} else if (*in_str == '}' && out_str_size - 1 > 2) {
/* enough room to append */
*out_str++ = '}';
*out_str++ = *in_str++;
out_str_size -= 2;
} else if (*in_str == '}') {
/* not enough, truncate here */
break;
} else {
*out_str++ = *in_str++;
out_str_size--;
}
}
/* append termination */
*out_str++ = '}';
*out_str++ = '\0';
out_str_size -= 2;
/* return how many characters were left */
return strlen(in_str);
}
|
