examples/PIPS/antiword/src/sectlist.c

/*
 * sectlist.c
 * Copyright (C) 2001-2004 A.J. van Os; Released under GNU GPL
 *
 * Description:
 * Build, read and destroy list(s) of Word section information
 */

#include <stddef.h>
#include <string.h>
#include "antiword.h"


/*
 * Private structure to hide the way the information
 * is stored from the rest of the program
 */
typedef struct section_mem_tag {
        section_block_type      tInfo;
        ULONG                   ulCharPos;
        struct section_mem_tag  *pNext;
} section_mem_type;

/* Variables needed to write the Section Information List */
static section_mem_type *pAnchor = NULL;
static section_mem_type *pSectionLast = NULL;


/*
 * vDestroySectionInfoList - destroy the Section Information List
 */
void
vDestroySectionInfoList(void)
{
        section_mem_type        *pCurr, *pNext;

        DBG_MSG("vDestroySectionInfoList");

        /* Free the Section Information List */
        pCurr = pAnchor;
        while (pCurr != NULL) {
                pNext = pCurr->pNext;
                pCurr = xfree(pCurr);
                pCurr = pNext;
        }
        pAnchor = NULL;
        /* Reset all control variables */
        pSectionLast = NULL;
} /* end of vDestroySectionInfoList */

/*
 * vAdd2SectionInfoList - Add an element to the Section Information List
 */
void
vAdd2SectionInfoList(const section_block_type *pSection, ULONG ulCharPos)
{
        section_mem_type        *pListMember;

        fail(pSection == NULL);

        /* Create list member */
        pListMember = xmalloc(sizeof(section_mem_type));
        /* Fill the list member */
        pListMember->tInfo = *pSection;
        pListMember->ulCharPos = ulCharPos;
        pListMember->pNext = NULL;
        /* Add the new member to the list */
        if (pAnchor == NULL) {
                pAnchor = pListMember;
        } else {
                fail(pSectionLast == NULL);
                pSectionLast->pNext = pListMember;
        }
        pSectionLast = pListMember;
} /* vAdd2SectionInfoList */

/*
 * vGetDefaultSection - fill the section struct with default values
 */
void
vGetDefaultSection(section_block_type *pSection)
{
        (void)memset(pSection, 0, sizeof(*pSection));
        pSection->bNewPage = TRUE;
} /* end of vGetDefaultSection */

/*
 * vDefault2SectionInfoList - Add a default to the Section Information List
 */
void
vDefault2SectionInfoList(ULONG ulCharPos)
{
        section_block_type      tSection;

        vGetDefaultSection(&tSection);
        vAdd2SectionInfoList(&tSection, ulCharPos);
} /* end of vDefault2SectionInfoList */

/*
 * pGetSectionInfo - get the section information
 */
const section_block_type *
pGetSectionInfo(const section_block_type *pOld, ULONG ulCharPos)
{
        const section_mem_type  *pCurr;

        if (pOld == NULL || ulCharPos == 0) {
                if (pAnchor == NULL) {
                        /* There are no records, make one */
                        vDefault2SectionInfoList(0);
                        fail(pAnchor == NULL);
                }
                /* The first record */
                NO_DBG_MSG("First record");
                return &pAnchor->tInfo;
        }

        NO_DBG_HEX(ulCharPos);
        for (pCurr = pAnchor; pCurr != NULL; pCurr = pCurr->pNext) {
                NO_DBG_HEX(pCurr->ulCharPos);
                if (ulCharPos == pCurr->ulCharPos ||
                    ulCharPos + 1 == pCurr->ulCharPos) {
                        NO_DBG_HEX(pCurr->ulCharPos);
                        return &pCurr->tInfo;
                }
        }
        return pOld;
} /* end of pGetSectionInfo */

/*
 * tGetNumberOfSections - get the number of sections
 */
size_t
tGetNumberOfSections(void)
{
        const section_mem_type  *pCurr;
        size_t  tCounter;

        for (tCounter = 0, pCurr = pAnchor;
             pCurr != NULL;
             tCounter++, pCurr = pCurr->pNext)
                ;       /* Empty */
        return tCounter;
} /* end of tGetNumberOfSections */

/*
 * ucGetSepHdrFtrSpecification - get the Heder/footer specification
 */
UCHAR
ucGetSepHdrFtrSpecification(size_t tSectionNumber)
{
        const section_mem_type  *pCurr;
        size_t  tIndex;

        for (tIndex = 0, pCurr = pAnchor;
             tIndex < tSectionNumber && pCurr != NULL;
             tIndex++, pCurr = pCurr->pNext)
                ;       /* Empty */
        if (pCurr == NULL) {
                DBG_DEC(tSectionNumber);
                DBG_FIXME();
                return 0x00;
        }
        return pCurr->tInfo.ucHdrFtrSpecification;
} /* end of ucGetSepHdrFtrSpecification */

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