contrib/groff-1.19/src/xditview/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 #ifdef X_NOT_STDC_ENV
  15 extern long     ftell();
  16 #endif
  17
  18 static DviFileMap *
  19 MapPageNumberToFileMap (dw, number)
  20         DviWidget       dw;
  21         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 (m)
  33         DviFileMap      *m;
  34 {
  35         DviFileMap      *next;
  36
  37         for (; m; m = next) {
  38                 next = m->next;
  39                 XtFree ((char *) m);
  40         }
  41 }
  42
  43 void
  44 ForgetPagePositions (dw)
  45         DviWidget       dw;
  46 {
  47         DestroyFileMap (dw->dvi.file_map);
  48         dw->dvi.file_map = 0;
  49 }
  50
  51 void
  52 RememberPagePosition(dw, number)
  53         DviWidget       dw;
  54         int             number;
  55 {
  56         DviFileMap      *m;
  57
  58         if (!(m = MapPageNumberToFileMap (dw, number))) {
  59                 m = (DviFileMap *) XtMalloc (sizeof *m);
  60                 m->page_number = number;
  61                 m->next = dw->dvi.file_map;
  62                 dw->dvi.file_map = m;
  63         }
  64         if (dw->dvi.tmpFile)
  65                 m->position = ftell (dw->dvi.tmpFile);
  66         else
  67                 m->position = ftell (dw->dvi.file);
  68 }
  69
  70 long
  71 SearchPagePosition (dw, number)
  72         DviWidget       dw;
  73         int             number;
  74 {
  75         DviFileMap      *m;
  76
  77         if (!(m = MapPageNumberToFileMap (dw, number)))
  78                 return -1;
  79         return m->position;
  80 }
  81
  82 void
  83 FileSeek(dw, position)
  84 DviWidget       dw;
  85 long            position;
  86 {
  87         if (dw->dvi.tmpFile) {
  88                 dw->dvi.readingTmp = 1;
  89                 fseek (dw->dvi.tmpFile, position, 0);
  90         } else
  91                 fseek (dw->dvi.file, position, 0);
  92 }
  93