Author: dteske
Date: Fri Oct 11 20:12:30 2013
New Revision: 256335
URL: http://svnweb.freebsd.org/changeset/base/256335
Log:
Add new f_expand_number() (shadowing expand_number(3)).
Approved by: re (glebius)
Modified:
head/usr.sbin/bsdconfig/share/strings.subr
Modified: head/usr.sbin/bsdconfig/share/strings.subr
==============================================================================
--- head/usr.sbin/bsdconfig/share/strings.subr Fri Oct 11 20:11:24 2013
(r256334)
+++ head/usr.sbin/bsdconfig/share/strings.subr Fri Oct 11 20:12:30 2013
(r256335)
@@ -324,6 +324,112 @@ f_shell_unescape()
f_replaceall "$__string" "'\\''" "'" "$__var_to_set"
}
+# f_expand_number $string [$var_to_set]
+#
+# Unformat $string into a number, optionally to be stored in $var_to_set. This
+# function follows the SI power of two convention.
+#
+# The prefixes are:
+#
+# Prefix Description Multiplier
+# k kilo 1024
+# M mega 1048576
+# G giga 1073741824
+# T tera 1099511627776
+# P peta 1125899906842624
+# E exa 1152921504606846976
+#
+# NOTE: Prefixes are case-insensitive.
+#
+# Upon successful completion, the value 0 is returned (or stored to
+# $var_to_set); otherwise -1. Reasons for a -1 return include:
+#
+# Given $string contains no digits.
+# An unrecognized prefix was given.
+# Result too large to calculate.
+#
+f_expand_number()
+{
+ local __string="$1" __var_to_set="$2"
+ local __cp __num
+
+ # Remove any leading non-digits
+ while :; do
+ __cp="$__string"
+ __string="${__cp#[!0-9]}"
+ [ "$__string" = "$__cp" ] && break
+ done
+
+ # Return `-1' if string didn't contain any digits
+ if [ ! "$__string" ]; then
+ if [ "$__var_to_set" ]; then
+ setvar "$__var_to_set" -1
+ else
+ echo -1
+ fi
+ return $FAILURE
+ fi
+
+ # Store the numbers
+ __num="${__string%%[!0-9]*}"
+
+ # Shortcut
+ if [ $__num -eq 0 ]; then
+ if [ "$__var_to_set" ]; then
+ setvar "$__var_to_set" 0
+ else
+ echo 0
+ fi
+ return $SUCCESS
+ fi
+
+ # Remove all the leading numbers from the string to get at the prefix
+ while :; do
+ __cp="$__string"
+ __string="${__cp#[0-9]}"
+ [ "$__string" = "$__cp" ] && break
+ done
+
+ # Test for invalid prefix
+ case "$__string" in
+ ""|[KkMmGgTtPpEe]*) : known prefix ;;
+ *)
+ # Unknown prefix
+ if [ "$__var_to_set" ]; then
+ setvar "$__var_to_set" -1
+ else
+ echo -1
+ fi
+ return $FAILURE
+ esac
+
+ # Multiply the number out
+ case "$__string" in
+ [Kk]) __num=$(( $__num * 1024 )) ;;
+ [Mm]) __num=$(( $__num * 1048576 )) ;;
+ [Gg]) __num=$(( $__num * 1073741824 )) ;;
+ [Tt]) __num=$(( $__num * 1099511627776 )) ;;
+ [Pp]) __num=$(( $__num * 1125899906842624 )) ;;
+ [Ee]) __num=$(( $__num * 1152921504606846976 )) ;;
+ esac
+ if [ $__num -le 0 ]; then
+ # Arithmetic overflow
+ if [ "$__var_to_set" ]; then
+ setvar "$__var_to_set" -1
+ else
+ echo -1
+ fi
+ return $FAILURE
+ fi
+
+ # Return the number
+ if [ "$__var_to_set" ]; then
+ setvar "$__var_to_set" $__num
+ else
+ echo $__num
+ fi
+}
+
############################################################ MAIN
f_dprintf "%s: Successfully loaded." strings.subr
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