386BSD 0.0 development

[unix-history] / usr / src / usr.bin / groff / libXdvi / page.c

/*
* page.c
*
* map page numbers to file position
*/

#include <X11/Xos.h>
#include <X11/IntrinsicP.h>
#include <X11/StringDefs.h>
#include <stdio.h>
#include <ctype.h>
#include "DviP.h"

static DviFileMap *
MapPageNumberToFileMap (dw, number)
       DviWidget       dw;
       int             number;
{
       DviFileMap      *m;

       for (m = dw->dvi.file_map; m; m=m->next)
               if (m->page_number == number)
                       break;
       return m;
}

DestroyFileMap (m)
       DviFileMap      *m;
{
       DviFileMap      *next;

       for (; m; m = next) {
               next = m->next;
               free ((char *) m);
       }
}

ForgetPagePositions (dw)
       DviWidget       dw;
{
       DestroyFileMap (dw->dvi.file_map);
       dw->dvi.file_map = 0;
}

RememberPagePosition(dw, number)
       DviWidget       dw;
       int             number;
{
       extern long     ftell();
       DviFileMap      *m;

       if (!(m = MapPageNumberToFileMap (dw, number))) {
               m = (DviFileMap *) malloc (sizeof *m);
               m->page_number = number;
               m->next = dw->dvi.file_map;
               dw->dvi.file_map = m;
       }
       if (dw->dvi.tmpFile)
               m->position = ftell (dw->dvi.tmpFile);
       else
               m->position = ftell (dw->dvi.file);
}

SearchPagePosition (dw, number)
       DviWidget       dw;
       int             number;
{
       DviFileMap      *m;

       if (!(m = MapPageNumberToFileMap (dw, number)))
               return -1;
       return m->position;
}

FileSeek(dw, position)
DviWidget       dw;
long            position;
{
       if (dw->dvi.tmpFile) {
               dw->dvi.readingTmp = 1;
               fseek (dw->dvi.tmpFile, position, 0);
       } else
               fseek (dw->dvi.file, position, 0);
}