Initial commit

1 files changed, 46 insertions, 0 deletions

diff --git a/pkg/lists/unique.x b/pkg/lists/unique.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# UNIQUE -- Pass only unique lines from the (presumably sorted) standard
+# input to the standard output.  In other words, if a sequence of identical
+# lines are found in the input, only one copy is passed to the output.
+
+procedure t_unique()
+
+int	list, fd
+pointer	sp, fname, old_line, new_line, temp
+bool	streq()
+int	getline(), clpopni(), clgfil(), clplen(), open()
+
+begin
+	call smark (sp)
+	call salloc (fname, SZ_FNAME, TY_CHAR)
+	call salloc (old_line, SZ_LINE, TY_CHAR)
+	call salloc (new_line, SZ_LINE, TY_CHAR)
+
+	list = clpopni ("files")
+
+	while (clgfil (list, Memc[fname], SZ_FNAME) != EOF) {
+	    fd = open (Memc[fname], READ_ONLY, TEXT_FILE)
+	    if (clplen (list) > 1) {
+		call printf ("\n\n==> %s <==\n")
+		    call pargstr (Memc[fname])
+	    }
+
+	    Memc[old_line] = EOS
+
+	    while (getline (fd, Memc[new_line]) != EOF) {
+		if (streq (Memc[old_line], Memc[new_line]))
+		    next
+		call putline (STDOUT, Memc[new_line])
+
+		# Swap buffers.
+		temp = old_line
+		old_line = new_line
+		new_line = temp
+	    }
+
+	    call close (fd)
+	}
+
+	call sfree (sp)
+end