From fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 Mon Sep 17 00:00:00 2001
From: Joseph Hunkeler <jhunkeler@gmail.com>
Date: Wed, 8 Jul 2015 20:46:52 -0400
Subject: Initial commit

---
 pkg/images/imutil/src/hselect.x | 132 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 pkg/images/imutil/src/hselect.x

(limited to 'pkg/images/imutil/src/hselect.x')

diff --git a/pkg/images/imutil/src/hselect.x b/pkg/images/imutil/src/hselect.x
new file mode 100644
index 00000000..5be85627
--- /dev/null
+++ b/pkg/images/imutil/src/hselect.x
@@ -0,0 +1,132 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<error.h>
+include	<evexpr.h>
+include	<ctype.h>
+
+define	LEN_USERAREA	28800		# allow for the largest possible header
+
+
+# HSELECT -- Perform a relational select operation upon a set of images.
+# Our function is to select all images from the input set matching some
+# criteria, printing the listed fields of each selected image on the standard
+# output in list form.
+#
+# N.B.: this task shares code with the HEDIT task.
+
+procedure t_hselect()
+
+pointer	sp, im, image, fields, expr, missing, section
+int	imlist, ip, min_lenuserarea
+int	imtopenp(), imtgetim(), envfind(), ctoi()
+pointer	immap()
+
+begin
+	call smark (sp)
+	call salloc (image,   SZ_FNAME, TY_CHAR)
+	call salloc (fields,  SZ_LINE,  TY_CHAR)
+	call salloc (expr,    SZ_LINE,  TY_CHAR)
+	call salloc (missing, SZ_LINE,  TY_CHAR)
+	call salloc (section, SZ_FNAME, TY_CHAR)
+
+	# Get the primary operands.
+	imlist = imtopenp ("images")
+	call clgstr ("fields", Memc[fields], SZ_LINE)
+	call clgstr ("expr",   Memc[expr],   SZ_LINE)
+	call clgstr ("missing", Memc[missing], SZ_LINE)
+
+	# Main processing loop.  An image is processed in each pass through
+	# the loop.
+
+	while (imtgetim (imlist, Memc[image], SZ_FNAME) != EOF) {
+
+	    # Check size of user area
+	    if (envfind ("min_lenuserarea", Memc[section], SZ_FNAME) > 0) {
+		ip = 1
+		if (ctoi (Memc[section], ip, min_lenuserarea) <= 0)
+		    min_lenuserarea = LEN_USERAREA
+		else
+		    min_lenuserarea = max (LEN_USERAREA, min_lenuserarea)
+	    } else
+		min_lenuserarea = LEN_USERAREA
+
+	    # Open the image.
+	    iferr (im = immap (Memc[image], READ_ONLY, min_lenuserarea)) {
+		call erract (EA_WARN)
+		next
+	    }
+
+	    call he_getopsetimage (im, Memc[image], Memc[image])
+	    call hs_select (im, Memc[image], Memc[fields], Memc[expr],
+	        Memc[missing])
+
+	    call imunmap (im)
+	    call flush (STDOUT)
+	}
+
+	call imtclose (imlist)
+	call sfree (sp)
+end
+
+
+# HS_SELECT -- Evaluate the user supplied boolean expression using the
+# header parameter values for an image, and print the values of the listed
+# parameters on the standard output if the expression is true.
+
+procedure hs_select (im, image, fields, expr, missing)
+
+pointer	im			# image descriptor
+char	image[ARB]		# name of image being evaluated
+char	fields[ARB]		# fields to be passed if record is selected
+char	expr[ARB]		# exression to be evaluated
+char	missing[ARB]		# missing output value
+
+int	fieldno
+pointer	o, sp, field, value, flist
+pointer	evexpr(), imofnlu()
+int	locpr(), imgnfn()
+extern	he_getop()
+errchk	evexpr, imofnlu, imgnfn
+
+begin
+	call smark (sp)
+	call salloc (field, SZ_FNAME, TY_CHAR)
+	call salloc (value, SZ_LINE,  TY_CHAR)
+
+	# Evaluate selection criteria.
+	o = evexpr (expr, locpr(he_getop), 0)
+	if (O_TYPE(o) != TY_BOOL)
+	    call error (1, "expression must be boolean")
+
+	# Print the values of the listed fields if the record was selected.
+	if (O_VALB(o)) {
+	    flist = imofnlu (im, fields)
+
+	    fieldno = 1
+	    while (imgnfn (flist, Memc[field], SZ_FNAME) != EOF) {
+		iferr {
+		    call he_gval (im, image, Memc[field], Memc[value], SZ_LINE)
+		} then {
+		    call printf ("\t%s")
+		        call pargstr (missing)
+		} else {
+		    if (fieldno == 1) {
+			call printf ("%s")
+			    call he_pargstr (Memc[value])
+		    } else {
+			call printf ("\t%s")
+			    call he_pargstr (Memc[value])
+		    }
+		}
+		fieldno = fieldno + 1
+	    }
+	    call printf ("\n")
+
+	    call imcfnl (flist)
+	    call flush (STDOUT)
+	}
+
+	call xev_freeop (o)
+	call mfree (o, TY_STRUCT)
+	call sfree (sp)
+end
-- 
cgit