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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 {
# Quote quotes
gsub("\"", "\\\"")
# Is this the start of a new environment variable?
if (match($0, "^([^ \t=][^ =]*)=(.*)$", arr)) {
if (length(env) != 0) {
# Record the value of the variable now completed
vars[var] = env
}
var = arr[1]
env = arr[2]
# Deal with += which concatenates the new string to the existing
# variable
if (length(env) != 0 && match(var, "^(.*)[+]$", var_arr))
{
# Allow var\+=val to indicate that the variable name is
# var+ and this is not actually a concatenation
if (substr(var_arr[1], length(var_arr[1])) == "\\") {
# Drop the backslash
sub(/\\[+]$/, "+", var)
} else {
var = var_arr[1]
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
}
if (length(vars) != 0) {
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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