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diff --git a/noao/digiphot/photcal/io/iolineid.x b/noao/digiphot/photcal/io/iolineid.x
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+++ b/noao/digiphot/photcal/io/iolineid.x
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+include	<ctype.h>
+
+
+# IO_LINEID - Get the line identification string from input line and advance
+# pointer to next non-white character. Convert matching string to uppercase,
+# and keep characters in the [A..Z, 0..9] set, but return both the original
+# and compressed matching strings. The first one is intended for output to
+# the user, and the second for internal use to avoid typos.
+
+int procedure io_lineid (line, ip, uid, cid, maxch)
+
+char	line[ARB]		# input line
+int	ip			# input pointer
+char	uid[ARB]		# user's (original) line identification string
+char	cid[ARB]		# compressed line identification string
+int	maxch			# output chars
+
+int	i, op
+
+begin
+	# Discard the leading whitespaces.
+	while (IS_WHITE (line[ip]) && line[ip] != EOS)
+	    ip = ip + 1
+
+	# Get the line identifier.
+	for (op = 1; !IS_WHITE (line[ip]) && line[ip] != EOS && op <= maxch;
+	     op = op + 1) {
+	    uid[op] = line[ip]
+	    ip = ip + 1
+	}
+	uid[op] = EOS
+
+	# Copy the orignal identifier into the compressed identifier,
+	# and convert the latter to upper case.
+	call strcpy (uid, cid, maxch)
+	call strupr (cid)
+
+	# Take out all characters not belonging to the [A-Z,0-9,+,-,_] set.
+	op = 1
+	for (i = 1; cid[i] != EOS; i = i + 1) {
+	    if (IS_UPPER (cid[i]) || IS_DIGIT (cid[i]) || (cid[i] == '+') ||
+	        (cid[i] == '-') || (cid[i] == '_')) {
+		cid[op] = cid[i]
+		op = op + 1
+	    }
+	}
+	cid[op] = EOS
+
+	# Return number of characters in compressed identifier
+	return (op - 1)
+end