SqlString.cpp

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/*
// $Id: //open/dev/fennel/calculator/SqlString.cpp#2 $
// Fennel is a library of data storage and processing components.
// Copyright (C) 2005-2009 The Eigenbase Project
// Copyright (C) 2004-2009 SQLstream, Inc.
// Copyright (C) 2009-2009 LucidEra, Inc.
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 of the License, or (at your option)
// any later version approved by The Eigenbase Project.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// SqlString
//
// An ascii string library that adheres to the SQL99 standard definitions
*/

#include "fennel/common/CommonPreamble.h"
#include "fennel/calculator/SqlString.h"

FENNEL_BEGIN_NAMESPACE

int
SqlStrCat(
    char* dest,
    int destStorageBytes,
    int destLenBytes,
    char const * const str,
    int strLenBytes)
{
    if (destLenBytes + strLenBytes > destStorageBytes) {
        // SQL99 Part 2 Section 22.1 22-001 "String Data Right truncation"
        throw "22001";
    }

    memcpy(dest + destLenBytes, str, strLenBytes);
    return destLenBytes + strLenBytes;
}


int
SqlStrCat(
    char* dest,
    int destStorageBytes,
    char const * const str1,
    int str1LenBytes,
    char const * const str2,
    int str2LenBytes)
{
    if (str1LenBytes + str2LenBytes > destStorageBytes) {
        // SQL99 Part 2 Section 22.1 22-001
        // "String Data Right truncation"
        throw "22001";
    }

    memcpy(dest, str1, str1LenBytes);
    memcpy(dest + str1LenBytes, str2, str2LenBytes);
    return str1LenBytes + str2LenBytes;
}

int
SqlStrCmp_Bin(
    char const * const str1,
    int str1LenBytes,
    char const * const str2,
    int str2LenBytes)
{
    // First, check for differences in "common" length. If common length
    // are contains same values, declare the longer string "larger".
    int minLenBytes =
        str1LenBytes > str2LenBytes ? str2LenBytes : str1LenBytes;
    int memc = memcmp(str1, str2, minLenBytes);
    if (memc > 0) {
        // Normalize to -1, 0, 1
        return 1;
    } else if (memc < 0) {
        // Normalize to -1, 0, 1
        return -1;
    } else if (str1LenBytes == str2LenBytes) {
        // memc == 0
        // Equal length & contain same data -> equal
        return 0;
    } else if (str1LenBytes > str2LenBytes) {
        // Common contains same data, str1 is longer -> str1 > str2
        return 1;
    } else {
        // Common contains same data, str2 is longer -> str2 > str1
        return -1;
    }
}

int
SqlStrCpy_Var(
    char* dest,
    int destStorageBytes,
    char const * const str,
    int strLenBytes)
{
    if (strLenBytes > destStorageBytes) {
        // SQL99 Part 2 Section 22.1 22-001
        // "String Data Right truncation"
        throw "22001";
    }
    memcpy(dest, str, strLenBytes);
    return strLenBytes;
}

int
SqlStrLenBit(int strLenBytes)
{
    return 8 * strLenBytes;
}

int
SqlStrLenOct(int strLenBytes)
{
    return strLenBytes;
}


FENNEL_END_NAMESPACE

// End SqlString.cpp

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