gnu/dist/groff/src/devices/xditview/page.c

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