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