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1 files changed, 62 insertions, 0 deletions

diff --git a/sys/etc/envgets.x b/sys/etc/envgets.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<knet.h>
+include	<fset.h>
+include	"environ.h"
+
+# ENVGETS -- Search the environment list for the named environment variable
+# and return the string value if found.  If not found and the process input
+# is a terminal (the process is being run interactively in debug mode), generate
+# a query on the terminal, read the value of the environment variable, enter
+# it into the environment table, and return the value to the caller.
+
+int procedure envgets (key, value, maxch)
+
+char	key[ARB]		# environment variable name
+char	value[maxch]		# string value (output)
+int	maxch
+
+char	buf[SZ_FNAME]
+int	nchars, ttydriver, junk, in, out, ip
+int	gstrcpy(), envfind(), fstati(), strlen(), envputs()
+extern	zgetty()
+
+begin
+	# Search the environment list first.
+	nchars = envfind (key, value, maxch)
+	if (nchars >= 0)
+	    return (nchars)
+
+	# Key not found.  If the process input CLIN is a terminal, query the
+	# user for the value of the environment variable.  Only low level
+	# calls are used in the query to avoid the possibity of recursion.
+
+	call zlocpr (zgetty, ttydriver)
+	iferr {
+	    out = fstati (CLOUT, F_CHANNEL)
+	    in  = fstati (CLIN,  F_CHANNEL)
+	} then
+	    return (0)
+
+	if (fstati (CLIN, F_DEVICE) == ttydriver) {
+	    # Issue prompt, format "env.key: "
+	    call zputty (out, "env.", 4, junk)
+	    call zputty (out, key, strlen(key), junk)
+	    call zputty (out, ": ", 2, junk)
+	    call zflsty (out, junk)
+
+	    # Get value and enter in envlist, excluding the trailing newline.
+
+	    call zgetty (in, buf, SZ_FNAME, nchars)
+	    if (nchars <= 0)
+		return (0)
+	    for (ip=1;  buf[ip] != '\n' && ip <= nchars;  ip=ip+1)
+		;
+	    buf[ip] = EOS
+	    junk = envputs (key, buf)
+
+	    return (gstrcpy (buf, value, maxch))
+
+	} else
+	    return (0)
+end