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