cplstring.cpp

国际海图标准S-57格式数据读取源码VC

#include "stdafx.h"
#include "CplString.h"
#include "CplVsi.h"

CPL_CVSID("$Id: cpl_string.cpp,v 1.37 2003/12/02 15:56:47 warmerda Exp $");

/*=====================================================================
                    StringList manipulation functions.
 =====================================================================*/

/**********************************************************************
 *                       CSLAddString()
 *
 * Append a string to a StringList and return a pointer to the modified
 * StringList.
 * If the input StringList is NULL, then a new StringList is created.
 **********************************************************************/
char **CSLAddString(char **papszStrList, const char *pszNewString)
{
    int nItems=0;

    if (pszNewString == NULL)
        return papszStrList;    /* Nothing to do!*/

    /* Allocate room for the new string */
    if (papszStrList == NULL)
        papszStrList = (char**) CPLCalloc(2,sizeof(char*));
    else
    {
        nItems = CSLCount(papszStrList);
        papszStrList = (char**)CPLRealloc(papszStrList, 
                                          (nItems+2)*sizeof(char*));
    }

    /* Copy the string in the list */
    papszStrList[nItems] = CPLStrdup(pszNewString);
    papszStrList[nItems+1] = NULL;

    return papszStrList;
}

/**********************************************************************
 *                       CSLCount()
 *
 * Return the number of lines in a Stringlist.
 **********************************************************************/
int CSLCount(char **papszStrList)
{
    int nItems=0;

    if (papszStrList)
    {
        while(*papszStrList != NULL)
        {
            nItems++;
            papszStrList++;
        }
    }

    return nItems;
}


/************************************************************************/
/*                            CSLGetField()                             */
/*                                                                      */
/*      Fetches the indicated field, being careful not to crash if      */
/*      the field doesn't exist within this string list.  The           */
/*      returned pointer should not be freed, and doesn't               */
/*      necessarily last long.                                          */
/************************************************************************/

const char * CSLGetField( char ** papszStrList, int iField )

{
    int         i;

    if( papszStrList == NULL || iField < 0 )
        return( "" );

    for( i = 0; i < iField+1; i++ )
    {
        if( papszStrList[i] == NULL )
            return "";
    }

    return( papszStrList[iField] );
}

/**********************************************************************
 *                       CSLDestroy()
 *
 * Free all memory used by a StringList.
 **********************************************************************/
void CSLDestroy(char **papszStrList)
{
    char **papszPtr;

    if (papszStrList)
    {
        papszPtr = papszStrList;
        while(*papszPtr != NULL)
        {
            CPLFree(*papszPtr);
            papszPtr++;
        }

        CPLFree(papszStrList);
    }
}


/**********************************************************************
 *                       CSLDuplicate()
 *
 * Allocate and return a copy of a StringList.
 **********************************************************************/
char    **CSLDuplicate(char **papszStrList)
{
    char **papszNewList, **papszSrc, **papszDst;
    int  nLines;

    nLines = CSLCount(papszStrList);

    if (nLines == 0)
        return NULL;

    papszNewList = (char **)CPLMalloc((nLines+1)*sizeof(char*));
    papszSrc = papszStrList;
    papszDst = papszNewList;

    while(*papszSrc != NULL)
    {
        *papszDst = CPLStrdup(*papszSrc);

        papszSrc++;
        papszDst++;
    }
    *papszDst = NULL;

    return papszNewList;
}

/**********************************************************************
 *                       CSLLoad()
 *
 * Load a test file into a stringlist.
 *
 * Lines are limited in length by the size of the CPLReadLine() buffer.
 **********************************************************************/
char **CSLLoad(const char *pszFname)
{
    FILE        *fp;
    const char  *pszLine;
    char        **papszStrList=NULL;

    fp = VSIFOpen(pszFname, "rb");

    if (fp)
    {
        while(!VSIFEof(fp))
        {
            if ( (pszLine = CPLReadLine(fp)) != NULL )
            {
                papszStrList = CSLAddString(papszStrList, pszLine);
            }
        }

        VSIFClose(fp);

        CPLReadLine( NULL );
    }
    else
    {
        /* Unable to open file */
        CPLError(CE_Failure, CPLE_OpenFailed,
                 "CSLLoad(%s): %s", pszFname, strerror(errno));
    }

    return papszStrList;
}

/**********************************************************************
 *                       CSLSave()
 *
 * Write a stringlist to a text file.
 *
 * Returns the number of lines written, or 0 if the file could not 
 * be written.
 **********************************************************************/
int  CSLSave(char **papszStrList, const char *pszFname)
{
    FILE    *fp;
    int     nLines = 0;

    if (papszStrList)
    {
        if ((fp = VSIFOpen(pszFname, "wt")) != NULL)
        {
            while(*papszStrList != NULL)
            {
                if (VSIFPuts(*papszStrList, fp) == EOF ||
                    VSIFPutc('\n', fp) == EOF)
                {
                    CPLError(CE_Failure, CPLE_FileIO,
                             "CSLSave(%s): %s", pszFname, 
                             strerror(errno));
                    break;  /* A Problem happened... abort */
                }

                nLines++;
                papszStrList++;
            }

            VSIFClose(fp);
        }
        else
        {
            /* Unable to open file */
            CPLError(CE_Failure, CPLE_OpenFailed,
                     "CSLSave(%s): %s", pszFname, strerror(errno));
        }
    }

    return nLines;
}

/**********************************************************************
 *                       CSLPrint()
 *
 * Print a StringList to fpOut.  If fpOut==NULL, then output is sent
 * to stdout.
 *
 * Returns the number of lines printed.
 **********************************************************************/
int  CSLPrint(char **papszStrList, FILE *fpOut)
{
    int     nLines=0;

    if (fpOut == NULL)
        fpOut = stdout;

    if (papszStrList)
    {
        while(*papszStrList != NULL)
        {
            VSIFPrintf(fpOut, "%s\n", *papszStrList);
            nLines++;
            papszStrList++;
        }
    }

    return nLines;
}


/**********************************************************************
 *                       CSLInsertStrings()
 *
 * Copies the contents of a StringList inside another StringList 
 * before the specified line.
 *
 * nInsertAtLineNo is a 0-based line index before which the new strings
 * should be inserted.  If this value is -1 or is larger than the actual 
 * number of strings in the list then the strings are added at the end
 * of the source StringList.
 *
 * Returns the modified StringList.
 **********************************************************************/
char **CSLInsertStrings(char **papszStrList, int nInsertAtLineNo, 
                        char **papszNewLines)
{
    int     i, nSrcLines, nDstLines, nToInsert;
    char    **ppszSrc, **ppszDst;

    if (papszNewLines == NULL ||
        ( nToInsert = CSLCount(papszNewLines) ) == 0)
        return papszStrList;    /* Nothing to do!*/

    nSrcLines = CSLCount(papszStrList);
    nDstLines = nSrcLines + nToInsert;

    /* Allocate room for the new strings */
    papszStrList = (char**)CPLRealloc(papszStrList, 
                                      (nDstLines+1)*sizeof(char*));

    /* Make sure the array is NULL-terminated... it may not be if
     * papszStrList was NULL before Realloc()
     */
    papszStrList[nSrcLines] = NULL;

    /* Make some room in the original list at the specified location 
     * Note that we also have to move the NULL pointer at the end of
     * the source StringList.
     */
    if (nInsertAtLineNo == -1 || nInsertAtLineNo > nSrcLines)
        nInsertAtLineNo = nSrcLines;

    ppszSrc = papszStrList + nSrcLines;
    ppszDst = papszStrList + nDstLines;

    for (i=nSrcLines; i>=nInsertAtLineNo; i--)
    {
        *ppszDst = *ppszSrc;
        ppszDst--;
        ppszSrc--;
    }

    /* Copy the strings to the list */
    ppszSrc = papszNewLines;
    ppszDst = papszStrList + nInsertAtLineNo;

    for (; *ppszSrc != NULL; ppszSrc++, ppszDst++)
    {
        *ppszDst = CPLStrdup(*ppszSrc);
    }
    
    return papszStrList;
}

/**********************************************************************
 *                       CSLInsertString()
 *
 * Insert a string at a given line number inside a StringList 
 *
 * nInsertAtLineNo is a 0-based line index before which the new string
 * should be inserted.  If this value is -1 or is larger than the actual 
 * number of strings in the list then the string is added at the end
 * of the source StringList.
 *
 * Returns the modified StringList.
 **********************************************************************/
char **CSLInsertString(char **papszStrList, int nInsertAtLineNo, 
                           char *pszNewLine)
{
    char *apszList[2];

    /* Create a temporary StringList and call CSLInsertStrings()
     */
    apszList[0] = pszNewLine;
    apszList[1] = NULL;

    return CSLInsertStrings(papszStrList, nInsertAtLineNo, apszList);
}


/**********************************************************************
 *                       CSLRemoveStrings()
 *
 * Remove strings inside a StringList 
 *
 * nFirstLineToDelete is the 0-based line index of the first line to 
 * remove. If this value is -1 or is larger than the actual 
 * number of strings in list then the nNumToRemove last strings are
 * removed.
 *
 * If ppapszRetStrings != NULL then the deleted strings won't be
 * free'd, they will be stored in a new StringList and the pointer to
 * this new list will be returned in *ppapszRetStrings.
 *
 * Returns the modified StringList.
 **********************************************************************/
char **CSLRemoveStrings(char **papszStrList, int nFirstLineToDelete,
                        int nNumToRemove, char ***ppapszRetStrings)
{
    int     i, nSrcLines, nDstLines;
    char    **ppszSrc, **ppszDst;

    nSrcLines = CSLCount(papszStrList);
    nDstLines = nSrcLines - nNumToRemove;

    if (nNumToRemove < 1 || nSrcLines == 0)
        return papszStrList;    /* Nothing to do!*/

    /* If operation will result in an empty StringList then don't waste
     * time here!
     */
    if (nDstLines < 1)
    {
        CSLDestroy(papszStrList);
        return NULL;
    }

    
    /* Remove lines from the source StringList...
     * Either free() each line or store them to a new StringList depending on
     * the caller's choice.
     */
    ppszDst = papszStrList + nFirstLineToDelete;

    if (ppapszRetStrings == NULL)
    {
        /* free() all the strings that will be removed.
         */
        for (i=0; i < nNumToRemove; i++)
        {
            CPLFree(*ppszDst);
            *ppszDst = NULL;
        }
    }
    else
    {
        /* Store the strings to remove in a new StringList
         */
        *ppapszRetStrings = (char **)CPLCalloc(nNumToRemove+1, sizeof(char*));

        for (i=0; i < nNumToRemove; i++)
        {
            (*ppapszRetStrings)[i] = *ppszDst;
            *ppszDst = NULL;
            ppszDst++;
        }
    }


    /* Shift down all the lines that follow the lines to remove.
     */
    if (nFirstLineToDelete == -1 || nFirstLineToDelete > nSrcLines)
        nFirstLineToDelete = nDstLines;

    ppszSrc = papszStrList + nFirstLineToDelete + nNumToRemove;
    ppszDst = papszStrList + nFirstLineToDelete;

    for ( ; *ppszSrc != NULL; ppszSrc++, ppszDst++)
    {
        *ppszDst = *ppszSrc;
    }
    /* Move the NULL pointer at the end of the StringList     */
    *ppszDst = *ppszSrc; 

    /* At this point, we could realloc() papszStrList to a smaller size, but
     * since this array will likely grow again in further operations on the
     * StringList we'll leave it as it is.
     */