1 files changed, 41 insertions, 0 deletions
diff --git a/examples/functions/isnum2 b/examples/functions/isnum2
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--- /dev/null
+++ b/examples/functions/isnum2
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+#
+#  Chet Ramey <chet.ramey@case.edu>
+#
+#  Copyright 1998 Chester Ramey
+#
+#   This program is free software; you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation; either version 2, or (at your option)
+#   any later version.
+#
+#   TThis program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program; if not, write to the Free Software Foundation,
+#   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+isnum2()
+{
+	case "$1" in
+	'[-+]' | '')	return 1;;	# empty or bare `-' or `+'
+	[-+]*[!0-9]*)	return 1;;	# non-digit with leading sign
+	[-+]*)		return 0;;	# OK
+	*[!0-9]*)	return 1;;	# non-digit
+	*)		return 0;;	# OK
+	esac
+}
+
+# this one handles floating point
+isnum3()
+{
+	case "$1" in
+	'')		return 1;;	# empty
+	*[!0-9.+-]*)	return 1;;	# non-digit, +, -, or .
+	*?[-+]*)	return 1;;	# sign as second or later char
+	*.*.*)		return 1;;	# multiple decimal points
+	*)		return 0;;	# OK
+	esac
+}