gnu/usr.bin/groff/libXdvi/page.c

   1 /*
   2  * page.c
   3  *
   4  * map page numbers to file position
   5  */
   6
   7 #include <X11/Xos.h>
   8 #include <X11/IntrinsicP.h>
   9 #include <X11/StringDefs.h>
  10 #include <stdio.h>
  11 #include <ctype.h>
  12 #include "DviP.h"
  13
  14 static DviFileMap *
  15 MapPageNumberToFileMap (dw, number)
  16         DviWidget       dw;
  17         int             number;
  18 {
  19         DviFileMap      *m;
  20
  21         for (m = dw->dvi.file_map; m; m=m->next)
  22                 if (m->page_number == number)
  23                         break;
  24         return m;
  25 }
  26
  27 DestroyFileMap (m)
  28         DviFileMap      *m;
  29 {
  30         DviFileMap      *next;
  31
  32         for (; m; m = next) {
  33                 next = m->next;
  34                 free ((char *) m);
  35         }
  36 }
  37
  38 ForgetPagePositions (dw)
  39         DviWidget       dw;
  40 {
  41         DestroyFileMap (dw->dvi.file_map);
  42         dw->dvi.file_map = 0;
  43 }
  44
  45 RememberPagePosition(dw, number)
  46         DviWidget       dw;
  47         int             number;
  48 {
  49         extern long     ftell();
  50         DviFileMap      *m;
  51
  52         if (!(m = MapPageNumberToFileMap (dw, number))) {
  53                 m = (DviFileMap *) malloc (sizeof *m);
  54                 m->page_number = number;
  55                 m->next = dw->dvi.file_map;
  56                 dw->dvi.file_map = m;
  57         }
  58         if (dw->dvi.tmpFile)
  59                 m->position = ftell (dw->dvi.tmpFile);
  60         else
  61                 m->position = ftell (dw->dvi.file);
  62 }
  63
  64 SearchPagePosition (dw, number)
  65         DviWidget       dw;
  66         int             number;
  67 {
  68         DviFileMap      *m;
  69
  70         if (!(m = MapPageNumberToFileMap (dw, number)))
  71                 return -1;
  72         return m->position;
  73 }
  74
  75 FileSeek(dw, position)
  76 DviWidget       dw;
  77 long            position;
  78 {
  79         if (dw->dvi.tmpFile) {
  80                 dw->dvi.readingTmp = 1;
  81                 fseek (dw->dvi.tmpFile, position, 0);
  82         } else
  83                 fseek (dw->dvi.file, position, 0);
  84 }
  85