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# SPDX-License-Identifier: GPL-2.0+
#
# Copyright 2021 Google, Inc
#
# SPDX-License-Identifier: GPL-2.0+
#
# Awk script to parse a text file containing an environment and convert it
# to a C string which can be compiled into U-Boot.
# The resulting output is:
#
# #define CONFIG_EXTRA_ENV_TEXT "<environment here>"
#
# If the input is empty, this script outputs a comment instead.
BEGIN {
# env holds the env variable we are currently processing
env = "";
ORS = ""
}
# 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 (has_var) {
if (length(env) != 0) {
# Record the value of the variable now completed
vars[var] = env
do_output = 1
}
# Collect the variable name. The value follows the '='
match($0, "^([^ \t=][^ =]*)=")
var = substr($0, 1, RLENGTH - 1)
env = substr($0, RLENGTH + 1)
# Deal with += which concatenates the new string to the existing
# variable. Again we are careful to use POSIX match()
if (length(env) != 0 && match(var, "^(.*)[+]$")) {
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(plusname, length(plusname)) == "\\") {
# Drop the backslash
sub(/\\[+]$/, "+", var)
} else {
var = plusname
env = vars[var] env
}
}
} else {
# Change newline to space
gsub(/^[ \t]+/, "")
# Don't keep leading spaces generated by the previous blank line
if (length(env) == 0) {
env = $0
} else {
env = env " " $0
}
}
}
END {
# Record the value of the variable now completed. If the variable is
# empty it is not set.
if (length(env) != 0) {
vars[var] = env
do_output = 1
}
if (do_output) {
printf("%s", "#define CONFIG_EXTRA_ENV_TEXT \"")
# Print out all the variables
for (var in vars) {
env = vars[var]
print var "=" vars[var] "\\0"
}
print "\"\n"
}
}
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