136 lines
3.2 KiB
Awk
136 lines
3.2 KiB
Awk
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#!/bin/awk -f
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# scripts/dfn.awk - process a .dfn file
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#
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# last changed in libpng version 1.5.14 - February 4, 2013
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#
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# Copyright (c) 2013-2013 Glenn Randers-Pehrson
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#
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# This code is released under the libpng license.
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# For conditions of distribution and use, see the disclaimer
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# and license in png.h
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# The output of this script is written to the file given by
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# the variable 'out', which should be set on the command line.
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# Error messages are printed to stdout and if any are printed
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# the script will exit with error code 1.
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BEGIN{
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out="/dev/null" # as a flag
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out_count=0 # count of output lines
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err=0 # set if an error occured
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sort=0 # sort the output
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array[""]=""
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}
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# The output file must be specified before any input:
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NR==1 && out == "/dev/null" {
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print "out=output.file must be given on the command line"
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# but continue without setting the error code, this allows the
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# script to be checked easily
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}
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# Output can be sorted; two lines are recognized
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$1 == "PNG_DFN_START_SORT"{
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sort=0+$2
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next
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}
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$1 ~ /^PNG_DFN_END_SORT/{
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# Do a very simple, slow, sort; notice that blank lines won't be
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# output by this
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for (entry in array) {
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while (array[entry] != "") {
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key = entry
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value = array[key]
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array[key] = ""
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for (alt in array) {
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if (array[alt] != "" && alt < key) {
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array[key] = value
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value = array[alt]
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key = alt
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array[alt] = ""
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}
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}
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print value >out
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}
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}
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sort=0
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next
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}
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/^[^"]*PNG_DFN *".*"[^"]*$/{
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# A definition line, apparently correctly formated, extract the
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# definition then replace any doubled "" that remain with a single
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# double quote. Notice that the original doubled double quotes
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# may have been split by tokenization
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orig=$0
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if (gsub(/^[^"]*PNG_DFN *"/,"") != 1 || gsub(/"[^"]*$/, "") != 1) {
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print "line", NR, "processing failed:"
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print orig
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print $0
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err=1
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} else {
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++out_count
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}
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# Now examine quotes within the value:
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#
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# @" - delete this and any following spaces
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# "@ - delete this and any original spaces
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# @' - replace this by a double quote
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#
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# This allows macro substitution by the C compiler thus:
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#
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# #define first_name John
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# #define last_name Smith
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#
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# PNG_DFN"#define name @'@" first_name "@ @" last_name "@@'"
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#
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# Might get C preprocessed to:
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#
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# PNG_DFN "#define foo @'@" John "@ @" Smith "@@'"
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#
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# Which this script reduces to:
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#
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# #define name "John Smith"
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#
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while (sub(/@" */, "")) {
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if (!sub(/ *"@/, "")) {
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print "unbalanced @\" ... \"@ pair"
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err=1
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break
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}
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}
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# Put any needed double quotes in
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gsub(/@'/,"\"")
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# Remove any trailing spaces (not really required, but for
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# editorial consistency
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sub(/ *$/, "")
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if (sort)
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array[$(sort)] = $0
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else
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print $0 >out
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next
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}
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/PNG_DFN/{
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print "line", NR, "incorrectly formated PNG_DFN line:"
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print $0
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err = 1
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}
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END{
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if (out_count > 0 || err > 0)
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exit err
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print "no definition lines found"
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exit 1
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}
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