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1 files changed, 32 insertions, 0 deletions

diff --git a/sys/etc/envgetb.x b/sys/etc/envgetb.x
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+++ b/sys/etc/envgetb.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# ENVGETB -- Check whether the named option is set in the environment.
+# Return true only if the option is defined in the environment and either has
+# no value string (i.e., the existence of the variable is what is significant)
+# or a value string which begins with the character 'y' or 'Y'.
+
+bool procedure envgetb (varname)
+
+char	varname[ARB]
+bool	answer
+pointer	sp, def
+int	envfind()
+
+begin
+	call smark (sp)
+	call salloc (def, SZ_LINE, TY_CHAR)
+
+	if (envfind (varname, Memc[def], SZ_LINE) < 0)
+	    answer = false
+	else {
+	    switch (Memc[def]) {
+	    case 'y', 'Y', EOS:
+		answer = true
+	    default:				# abort not justified
+		answer = false
+	    }
+	}
+
+	call sfree (sp)
+	return (answer)
+end