devtools/check-forbidden-tokens.awk

   1 # SPDX-License-Identifier: BSD-3-Clause
   2 # Copyright 2018 Arnon Warshavsky <arnon@qwilt.com>
   3
   4 # This awk script receives a list of expressions to monitor
   5 # and a list of folders to search these expressions in
   6 # - No search is done inside comments
   7 # - Both additions and removals of the expressions are checked
   8 #   A positive balance of additions fails the check
   9
  10 BEGIN {
  11         split(FOLDERS,deny_folders," ");
  12         split(EXPRESSIONS,deny_expr," ");
  13         in_file=0;
  14         in_comment=0;
  15         count=0;
  16         comment_start="/*"
  17         comment_end="*/"
  18 }
  19 # search for add/remove instances in current file
  20 # state machine assumes the comments structure is enforced by
  21 # checkpatches.pl
  22 (in_file) {
  23         # comment start
  24         if (index($0,comment_start) > 0) {
  25                 in_comment = 1
  26         }
  27         # non comment code
  28         if (in_comment == 0) {
  29                 for (i in deny_expr) {
  30                         forbidden_added = "^\\+.*" deny_expr[i];
  31                         forbidden_removed="^-.*" deny_expr[i];
  32                         current = expressions[deny_expr[i]]
  33                         if ($0 ~ forbidden_added) {
  34                                 count = count + 1;
  35                                 expressions[deny_expr[i]] = current + 1
  36                         }
  37                         if ($0 ~ forbidden_removed) {
  38                                 count = count - 1;
  39                                 expressions[deny_expr[i]] = current - 1
  40                         }
  41                 }
  42         }
  43         # comment end
  44         if (index($0,comment_end) > 0) {
  45                 in_comment = 0
  46         }
  47 }
  48 # switch to next file , check if the balance of add/remove
  49 # of previous filehad new additions
  50 ($0 ~ "^\\+\\+\\+ b/") {
  51         in_file = 0;
  52         if (count > 0) {
  53                 exit;
  54         }
  55         for (i in deny_folders) {
  56                 re = "^\\+\\+\\+ b/" deny_folders[i];
  57                 if ($0 ~ deny_folders[i]) {
  58                         in_file = 1
  59                         last_file = $0
  60                 }
  61         }
  62 }
  63 END {
  64         if (count > 0) {
  65                 print "Warning in " substr(last_file,7) ":"
  66                 print MESSAGE
  67                 exit RET_ON_FAIL
  68         }
  69 }