Merge commit 'f6663322e3efc841d04a4336f7f9ff55a07e5128'

diff --combined cgilite/file.sh
index b6118f522d8b31d4fa0b19ec42226ab263b705cf,51ec245f2678602a12882d71d39173ff9acd98b1..51ec245f2678602a12882d71d39173ff9acd98b1
--- 1/cgilite/file.sh
--- 2/file.sh
+++ b/cgilite/file.sh
@@@ -1,6 -1,6 +1,6 @@@
  #!/bin/sh
  
- # Copyright 2016 - 2018 Paul Hänsch
+ # Copyright 2016 - 2019 Paul Hänsch
  #
  # This file is part of cgilite.
  # 
@@@ -59,7 -59,7 +59,7 @@@ FILE()
      # Parse the allowable date formats from Section 3.3.1 of
      # https://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html
      HEADER If-Modified-Since \
-     | sed -r 's;^[^ ]+, ([0-9]{2}) (...) ([0-9]{4}) (..:..:..) GMT$;\3-\2-\1 \4;;
+     | sed -E 's;^[^ ]+, ([0-9]{2}) (...) ([0-9]{4}) (..:..:..) GMT$;\3-\2-\1 \4;;
                s;^[^ ]+, ([0-9]{2})-(...)-([789][0-9]) (..:..:..) GMT$;19\3-\2-\1 \4;;
                s;^[^ ]+, ([0-9]{2})-(...)-([0-6][0-9]) (..:..:..) GMT$;20\3-\2-\1 \4;;
                s;^[^ ]+ (...) ([0-9]{2}) (..:..:..) ([0-9]{4})$;\4-\1-\2 \3;;
@@@ -69,7 -69,7 +69,7 @@@
      | xargs -r0 date +%s -ud 2>&-
    )"
  
-   range="$(HEADER Range |sed -nr 's;^bytes=([0-9]+-[0-9]*|-[0-9]+)$;\1;p;q;')"
+   range="$(HEADER Range |sed -nE 's;^bytes=([0-9]+-[0-9]*|-[0-9]+)$;\1;p;q;')"
    case "$range" in
      *-) range="${range}$((file_size - 1))";;
      -*) [ ${range#-} -le $file_size ] \

diff --combined cgilite/session.sh
index 25a65987c3671df4f4c8499279a71487edad5775,8ed8d8808e0655cc8b89c6ce7bb0df318b0b571f..8ed8d8808e0655cc8b89c6ce7bb0df318b0b571f
--- 1/cgilite/session.sh
--- 2/session.sh
+++ b/cgilite/session.sh
@@@ -41,6 -41,15 +41,15 @@@ timeid()
  
  checkid(){ grep -m 1 -xE '[0-9a-zA-Z:=]{16}'; }
  
+ transid(){
+   # transaction ID to modify a given file
+   local file="$1"
+   { stat -c %F%i%n%N%s%Y "$file" 2>&-
+     printf %s "$SESSION_ID"
+     server_key
+   } | sha256sum | cut -d\  -f1
+ }
+ 
  update_session(){
    local session sid time sig serverkey checksig
  
@@@ -53,9 -62,9 +62,9 @@@
    checksig="${checksig%% *}"
    d=$(date +%s)
    
-   if [ "$checksig" != "$sig" \
-     -o "$time" -lt "$d" \
-     -o ! "$(printf %s "$sid" |checkid)" ] 2>&-
+   if ! [ "$checksig" = "$sig" \
+     -a "$time" -ge "$d" \
+     -a "$(printf %s "$sid" |checkid)" ] 2>&-
    then
      debug Setting up new session
      sid="$(randomid)"

diff --combined cgilite/storage.sh
index 0d09b262b4d700dac399dbc165ff5250570d16fa,10a802950465c813001a3aa27f95f2f4a22dd1b7..10a802950465c813001a3aa27f95f2f4a22dd1b7
--- 1/cgilite/storage.sh
--- 2/storage.sh
+++ b/cgilite/storage.sh
@@@ -1,6 -1,6 +1,6 @@@
  #!/bin/sh
  
- # Copyright 2018 Paul Hänsch
+ # Copyright 2018, 2019 Paul Hänsch
  #
  # This is a file format helper, part of CGIlite.
  # 
@@@ -74,7 -74,7 +74,7 @@@ STRING=
  
  STRING(){
    { [ $# -eq 0 ] && cat || printf %s "$*"; } \
-   | sed -r ':X; $!{N;bX;}'"$STRING"
+   | sed -E ':X; $!{N;bX;}'"$STRING"
  }
  
  UNSTRING='
@@@ -89,5 -89,5 +89,5 @@@
  '
  UNSTRING(){
    { [ $# -eq 0 ] && cat || printf %s "$*"; } \
-   | sed -r "$UNSTRING"
+   | sed -E "$UNSTRING"
  }