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env: Avoid using GNU features in awk

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GNU has a very useful third argument to match() but this is not supported
in the POSIX awk.

Update the code to cope, so that the script is POSIX-compliant.

Signed-off-by: Simon Glass <sjg@chromium.org>
Tested-by: Mark Kettenis <mark.kettenis@xs4all.nl>
This commit is contained in:
Simon Glass 2021-11-24 07:40:14 -07:00
parent 1943f2a2a7
commit 7acb322568
1 changed files with 20 additions and 9 deletions
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29
scripts/env2string.awk
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@ -21,29 +21,39 @@ BEGIN {
# Skip empty lines, as these are generated by the clang preprocessor
NF {
do_output = 0
# Quote quotes
gsub("\"", "\\\"")
# Avoid using the non-POSIX third parameter to match(), by splitting
# the work into several steps.
has_var = match($0, "^([^ \t=][^ =]*)=(.*)$")
# Is this the start of a new environment variable?
if (match($0, "^([^ \t=][^ =]*)=(.*)$", arr)) {
if (has_var) {
if (length(env) != 0) {
# Record the value of the variable now completed
vars[var] = env
do_output = 1
}
var = arr[1]
env = arr[2]
# Collect the variable name. The value follows the '='
match($0, "^([^ \t=][^ =]*)=")
var = substr($0, 1, RLENGTH - 1)
env = substr($0, RLENGTH + 1)
# Deal with += which concatenates the new string to the existing
# variable
if (length(env) != 0 && match(var, "^(.*)[+]$", var_arr))
{
# variable. Again we are careful to use POSIX match()
if (length(env) != 0 && match(var, "^(.*)[+]$")) {
plusname = substr(var, RSTART, RLENGTH - 1)
# Allow var\+=val to indicate that the variable name is
# var+ and this is not actually a concatenation
if (substr(var_arr[1], length(var_arr[1])) == "\\") {
if (substr(plusname, length(plusname)) == "\\") {
# Drop the backslash
sub(/\\[+]$/, "+", var)
} else {
var = var_arr[1]
var = plusname
env = vars[var] env
}
}
@ -65,9 +75,10 @@ END {
# empty it is not set.
if (length(env) != 0) {
vars[var] = env
do_output = 1
}
if (length(vars) != 0) {
if (do_output) {
printf("%s", "#define CONFIG_EXTRA_ENV_TEXT \"")
# Print out all the variables