avoid eval leaks

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@5617 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/base-files/default/etc/functions.sh b/package/base-files/default/etc/functions.sh
index 0e7216d..1909ab2 100755 (executable)
--- a/package/base-files/default/etc/functions.sh
+++ b/package/base-files/default/etc/functions.sh
@@ -5,7 +5,7 @@
 alias debug=${DEBUG:-:}
 
 # newline
-N="
+readonly N="
 "
 
 _C=0
@@ -19,7 +19,7 @@ append() {
        local value="$2"
        local sep="${3:- }"
        
-       eval "$var=\"\${$var:+\${$var}\${value:+\$sep}}\$value\""
+       eval "export -n -- \"$var=\${$var:+\${$var}\${value:+\$sep}}\$value\""
 }
 
 reset_cb() {
@@ -36,14 +36,14 @@ config () {
        name="${name:-cfg${_C}}"
        config_cb "$cfgtype" "$name"
        CONFIG_SECTION="$name"
-       eval CONFIG_${CONFIG_SECTION}_TYPE="\$cfgtype"
+       export -n "CONFIG_${CONFIG_SECTION}_TYPE=$cfgtype"
 }
 
 option () {
        local varname="$1"; shift
        local value="$*"
        
-       eval CONFIG_${CONFIG_SECTION}_${varname}="\$value"
+       export -n "CONFIG_${CONFIG_SECTION}_${varname}=$value"
        option_cb "$varname" "$*"
 }
 
@@ -57,7 +57,7 @@ config_rename() {
        for oldvar in `set | grep ^CONFIG_${OLD}_ | \
                sed -e 's/\(.*\)=.*$/\1/'` ; do
                newvar="CONFIG_${NEW}_${oldvar##CONFIG_${OLD}_}"
-               eval "$newvar=\${$oldvar}"
+               export -n "$newvar=\${$oldvar}"
                unset "$oldvar"
        done
        
@@ -93,7 +93,7 @@ config_load() {
 config_get() {
        case "$3" in
                "") eval "echo \"\${CONFIG_${1}_${2}}\"";;
-               *)  eval "$1=\"\${CONFIG_${2}_${3}}\"";;
+               *)  eval "export -n -- \"$1=\${CONFIG_${2}_${3}}\"";;
        esac
 }
 
@@ -101,7 +101,7 @@ config_set() {
        local section="$1"
        local option="$2"
        local value="$3"
-       eval CONFIG_${section}_${option}="\$value"
+       export -n "CONFIG_${section}_${option}=$value"
 }
 
 load_modules() {
@@ -137,12 +137,12 @@ strtok() { # <string> { <variable> [<separator>] ... }
 
                val="${val#$tmp$2}"
 
-               eval $1="\$tmp"; count=$((count+1))
+               export -n "$1=$tmp"; count=$((count+1))
                shift 2
        done
 
        if [ $# -gt 0 -a "$val" ]; then
-               eval $1="\$val"; count=$((count+1))
+               export -n "$1=$val"; count=$((count+1))
        fi
 
        return $count