BEGIN {
	print "#include <unistd.h>"
	print "#include <stdio.h>"
	print "#include <stdlib.h>"
	print "static char *interp(int n) {"
	print "if (n == -1) return \"never supported\";"
	print "if (n == 0) return \"may be supported; need to test at runtime\";"
	print "if (n > 0) return \"always supported\";"
	print "return \"interpretation unknown\";"
	print "}"
	print "int main(int argc, char *argv[]) {";
	print "char uname[500];"
	print "if (fgets(uname, sizeof(uname), stdin) == NULL || argc < 2) {"
	print "fprintf(stderr, \"Usage: uname -a | unistd_opts heading\\n\");"
	print "exit(EXIT_FAILURE);"
	print "}"
	print "FILE *out = fopen(\"unistd_opts.html\", \"w\");"
	print "fprintf(out, \"<h1>%s</h1>\\n\", argv[1]);"
	print "fprintf(out, \"<h2>Values of Version Test Macros, Constants for Options and Option Groups, Execution-Time Symbolic Constants\\n\");"
	print "fprintf(out, \"from The Open Group Base Specifications Issue 6. IEEE Std 1003.1, 2004 Edition</h2>\\n\");"
	print "fprintf(out, \"<p><table border='0' cellspacing='0' cellpadding='10' bgcolor='silver'><tr><td>The values shown here are for the system (from uname -a): %s</td></tr></table>\\n\", uname);"
	print "fprintf(out, \"<p><i>This web page has been generated automatically from the program unistd_opts,\\n\");"
	print "fprintf(out, \"which itself was generated automatically from an awk script. To read more and to download\\n\");"
	print "fprintf(out, \"the programs (BSD-licensed Open Source), go to</i>\\n\");"
	print "fprintf(out, \"<a href='http://www.basepath.com/aup'>www.basepath.com/aup</a>.\\n\");"
	print "fprintf(out, \"<p><i>For more information on the option groups, go to</i>\\n\");"
	print "fprintf(out, \"<a href='http://people.redhat.com/~drepper/posix-option-groups.html'>people.redhat.com/~drepper/posix-option-groups.html</a>\\n\");"
	print "fprintf(out, \"<i>and</i>\\n\");"
	print "fprintf(out, \"<a href='http://www.unix.org/version3'>The Single UNIX Specification, Version 3</a>.\\n\");"
}

/^_/ {
	if (NR > 1) {
		do_macro(macro, option, desc)
	}
	macro = substr($0, 1, length($0) - 1)
	option = ""
	desc = ""
	next
}

/^\t\[/ {
	option = substr($0, 3)
	option = substr(option, 0, length(option) - 2)
	next
}

/^\t/ {
	gsub(/</, "\\&lt;");
	gsub(/>/, "\\&gt;");
	desc = substr($0, 2, length($0) - 2)
	next
}


END {
	print "fprintf(out, \"<hr><i>End.</i>\\n\");"
	print "fclose(out);"
	print "exit(EXIT_SUCCESS);"
	print "}";
	print "/* end */"
}

function do_macro(macro, option, desc) {
	n = match(macro, / \(LEGACY\)/)
	if (n > 0) {
		macro = substr(macro, 1, n - 1)
		desc = "(LEGACY) " desc
	}
	print "fprintf(out, \"<hr><h3>%s</h3>\\n\", \"" macro "\");"
	if (option != "")
		print "fprintf(out, \"<b>Option Code:</b> %s\\n\", \"" option "\");"
	print "fprintf(out, \"<p>%s\\n\", \"" desc "\");"
	print "#ifdef " macro
	print "fprintf(out, \"<p><b>%s = %ld</b> (%s)\\n\", \"" macro "\", (long)" macro ", interp(" macro "));"
	print "#else"
	print "fprintf(out, \"<p><b>%s is undefined (feature may or may not be supported)</b>\\n\", \"" macro "\");"
	print "#endif"
}