From: Andre Noll <maan@systemlinux.org>
Date: Mon, 21 Jun 2010 14:29:20 +0000 (+0200)
Subject: gsu: Add gsu_check_arg_count().
X-Git-Url: http://git.tuebingen.mpg.de/?p=gsu.git;a=commitdiff_plain;h=b3e4039f76f3af4dc2c11642e9edd8309161951c

gsu: Add gsu_check_arg_count().

This function is open-coded $MANY times, so it makes sense to
have one globally visible function that can be called from all
scripts that use gsu.
---

diff --git a/funcs/gsu b/funcs/gsu
index b80fc91..75e569c 100644
--- a/funcs/gsu
+++ b/funcs/gsu
@@ -14,6 +14,7 @@ E_GSU_BAD_CONFIG_VAR		invalid config variable
 E_GSU_NEED_VALUE		value required but not given
 E_GSU_BAD_BOOL			bad value for boolian option
 E_GSU_BAD_OPTION_TYPE		invalid option type
+E_GSU_BAD_ARG_COUNT		invalid number of arguments
 E_NO_DEFAULT			missing default value
 $gsu_errors
 "
@@ -44,6 +45,29 @@ gsu_is_a_number()
 }
 export -f gsu_is_a_number
 
+# Usage: gsu_check_arg_count <num_given> <num1> [<num2>]
+#
+# If only <num1> ist given, then <num_given> must equal <num1>.
+# Otherwise, <num1>..<num2> is treated as a range and it is checked
+# that <num_given> lies between <num1> and <num2> inclusively.
+gsu_check_arg_count()
+{
+	ret=-$E_GSU_BAD_ARG_COUNT
+	if [[ $# -eq 2 ]]; then # only num1 is given
+		result="exactly $2 args needed, $1 given"
+		[[ $1 -ne $2 ]] && return
+		ret=$GSU_SUCCESS
+		return
+	fi
+	# num1 and num2 given
+	result="need at least $2 args, $1 given"
+	[[ $1 -lt $2 ]] && return
+	result="need at most $3 args, $1 given"
+	[[ $1 -gt $3 ]] && return
+	ret=$GSU_SUCCESS
+}
+export -f gsu_check_arg_count
+
 gsu_short_msg()
 {
 	echo "$1" 1>&2
@@ -62,6 +86,8 @@ gsu_date_msg()
 }
 export -f gsu_date_msg
 
+
+
 _gsu_banner_msg()
 {
 	local txt="*** $_gsu_self --"