1 files changed, 47 insertions, 0 deletions
diff --git a/pkg/dataio/export/bltins/expgm.x b/pkg/dataio/export/bltins/expgm.x
new file mode 100644
index 00000000..c8a7a1d7
--- /dev/null
+++ b/pkg/dataio/export/bltins/expgm.x
@@ -0,0 +1,47 @@
+include <mach.h>
+include "../export.h"
+
+
+# EX_PGM - Write the evaluated expressions as a PGM format file.
+
+procedure ex_pgm (ex)
+
+pointer	ex					#i task struct pointer
+
+pointer	sp, hdr
+int	len, flags
+
+int	strlen()
+
+begin
+	# Check to see that we have the correct number of expressions to
+	# write this format.
+	flags = EX_OUTFLAGS(ex)
+	if (EX_NEXPR(ex) != 1 && !bitset(flags, OF_BAND))
+	    call error (7, "Invalid number of expressions for PGM file.")
+	if (bitset(flags, OF_LINE) || bitset (flags, LINE_STORAGE))
+	    call error (7, "Line storage illegal for PGM file.")
+
+	# Write the header to the file.
+	call smark (sp)
+	call salloc (hdr, SZ_LINE, TY_CHAR)
+	call aclrc (Memc[hdr], SZ_LINE)
+
+	call sprintf (Memc[hdr], SZ_LINE, "P5\n%-6d  %-6d\n255\n")
+	    call pargi (EX_OCOLS(ex) - mod (EX_OCOLS(ex),2))
+	    call pargi (EX_OROWS(ex))
+	len = strlen (Memc[hdr])
+	call strpak (Memc[hdr], Memc[hdr], SZ_LINE)
+	call write (EX_FD(ex), Memc[hdr], len/SZB_CHAR)
+	call sfree (sp)
+
+	# Fix the output pixel type to single bytes.
+	call ex_do_outtype (ex, "b1")
+	EX_OUTFLAGS(ex) = or (EX_OUTFLAGS(ex), OF_FLIPY)
+
+	# Finally, evaluate the expressions and write the image.
+	if (EX_NEXPR(ex) == 1 || bitset (flags, OF_BAND))
+	    call ex_no_interleave (ex)
+	else
+	    call error (7, "Shouldn't be here.")
+end