openwrt/package/base-files/default/usr/lib/parse-config.awk

   1 {
   2         line=$0
   3         gsub(/^[ \t]*/, "")
   4         gsub(/[ \t]*$/, "")
   5 }
   6
   7 $1 == "@define" {
   8         v[$2] = $3
   9 }
  10
  11 $1 == "@ifdef" {
  12         if_open = 1
  13         if (v[$2] != "") noprint = 0
  14         else noprint = 1
  15 }
  16
  17 $1 == "@ifndef" {
  18         if_open = 1
  19         if (v[$2] != "") noprint = 1
  20         else noprint = 0
  21 }
  22
  23 $1 == "@else" {
  24         if (noprint == 1) noprint = 0
  25         else noprint = 1
  26 }
  27
  28 ($1 !~ /^@/) && (noprint != 1) {
  29         n=split(line "@@", a, /@@/)
  30         for (i=1; i<=n; i++) {
  31                 if ((i % 2) == 1) printf a[i]
  32                 else printf v[a[i]]
  33         }
  34         print ""
  35 }
  36
  37 $1 == "@endif" {
  38         if_open = 0
  39         noprint = 0
  40 }