1 files changed, 17 insertions, 0 deletions
diff --git a/sys/fmtio/stridx.x b/sys/fmtio/stridx.x
new file mode 100644
index 00000000..dda74f5a
--- /dev/null
+++ b/sys/fmtio/stridx.x
@@ -0,0 +1,17 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# STRIDX -- Return the index of the first occurrence of a character in a
+# string.
+
+int procedure stridx (ch, str)
+
+char	ch, str[ARB]
+int	ip
+
+begin
+	do ip = 1, ARB
+	    if (str[ip] == EOS)
+		return (0)
+	    else if (str[ip] == ch)
+		return (ip)
+end