1 files changed, 88 insertions, 0 deletions
diff --git a/contrib/groff/xditview/page.c b/contrib/groff/xditview/page.c
new file mode 100644
index 0000000..9284199
--- /dev/null
+++ b/contrib/groff/xditview/page.c
@@ -0,0 +1,88 @@
+/*
+ * 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"
+
+#ifdef X_NOT_STDC_ENV
+extern long	ftell();
+#endif
+
+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;
+		XtFree ((char *) m);
+	}
+}
+
+ForgetPagePositions (dw)
+	DviWidget	dw;
+{
+	DestroyFileMap (dw->dvi.file_map);
+	dw->dvi.file_map = 0;
+}
+
+RememberPagePosition(dw, number)
+	DviWidget	dw;
+	int		number;
+{
+	DviFileMap	*m;
+
+	if (!(m = MapPageNumberToFileMap (dw, number))) {
+		m = (DviFileMap *) XtMalloc (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);
+}
+