php_odbc_utils.c

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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.
 */

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;
}

PHPAPI bool php_odbc_connstr_should_quote(const char *str)
{
    return strpbrk(str, "[]{}(),;?*=!@") != NULL;
}

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;
}

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);
}