12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394 |
- # 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 by alphabetic order, if using
- # gawk. This allows test_env_test.py to work on both awk (where
- # this next line does nothing)
- PROCINFO["sorted_in"] = "@ind_str_asc"
- for (var in vars) {
- env = vars[var]
- print var "=" vars[var] "\\0"
- }
- print "\"\n"
- }
- }
|