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symbols.pl: provide LIBCURL_HAS macro for apps

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Experience has shown that the symbols-in-versions file is very useful to
applications that want to build with a wide range of libcurl versions.
It is however easy to get it wrong and the source gets a bit messy with
all the fixed numerical comparisions.

The point of this script is to provide an easy-to-use macro for libcurl-
using applications to do preprocessor checks for specific libcurl
defines, and yet make the code clearly show what the macro is used for.
This commit is contained in:
Daniel Stenberg 2011-11-24 22:55:09 +01:00
parent c482e946f7
commit 4403e82f32
2 changed files with 101 additions and 1 deletions
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2
docs/libcurl/Makefile.am
View File

@ -82,7 +82,7 @@ PDFPAGES = curl_easy_cleanup.pdf curl_easy_getinfo.pdf \
CLEANFILES = $(HTMLPAGES) $(PDFPAGES)
EXTRA_DIST = $(man_MANS) $(HTMLPAGES) index.html $(PDFPAGES) libcurl.m4 ABI \
symbols-in-versions
symbols-in-versions symbols.pl
MAN2HTML= roffit --mandir=. < $< >$@
SUFFIXES = .3 .html

100
docs/libcurl/symbols.pl Executable file
View File

@ -0,0 +1,100 @@
#!/usr/bin/perl
#***************************************************************************
# _ _ ____ _
# Project ___| | | | _ \| |
# / __| | | | |_) | |
# | (__| |_| | _ <| |___
# \___|\___/|_| \_\_____|
#
# Copyright (C) 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at http://curl.haxx.se/docs/copyright.html.
#
# You may opt to use, copy, modify, merge, publish, distribute and/or sell
# copies of the Software, and permit persons to whom the Software is
# furnished to do so, under the terms of the COPYING file.
#
# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
# KIND, either express or implied.
#
###########################################################################
#
# Experience has shown that the symbols-in-versions file is very useful to
# applications that want to build with a wide range of libcurl versions.
# It is however easy to get it wrong and the source gets a bit messy with all
# the fixed numerical comparisions.
#
# The point of this script is to provide an easy-to-use macro for libcurl-
# using applications to do preprocessor checks for specific libcurl defines,
# and yet make the code clearly show what the macro is used for.
#
# Run this script and generate libcurl-symbols.h and then use that header in
# a fashion similar to:
#
# #include "libcurl-symbols.h"
#
# #if LIBCURL_HAS(CURLOPT_MUTE)
# has mute
# #else
# no mute
# #endif
#
#
open F, "<symbols-in-versions";
sub str2num {
my ($str)=@_;
if($str =~ /([0-9]*)\.([0-9]*)\.*([0-9]*)/) {
return sprintf("0x%06x", $1<<16 | $2 << 8 | $3);
}
}
print <<EOS
#include <curl/curl.h>
#define LIBCURL_HAS(x) \\
(defined(x ## _FIRST) && (x ## _FIRST <= LIBCURL_VERSION_NUM) && \\
(!defined(x ## _LAST) || ( x ## _LAST >= LIBCURL_VERSION_NUM)))
EOS
;
while(<F>) {
if(/^(CURL[^ ]*)[ \t]*(.*)/) {
my ($sym, $vers)=($1, $2);
my $intr;
my $rm;
my $dep;
# is there removed info?
if($vers =~ /([\d.]+)[ \t-]+([\d.]+)[ \t]+([\d.]+)/) {
($intr, $dep, $rm)=($1, $2, $3);
}
# is it a dep-only line?
elsif($vers =~ /([\d.]+)[ \t-]+([\d.]+)/) {
($intr, $dep)=($1, $2);
}
else {
$intr = $vers;
}
my $inum = str2num($intr);
print <<EOS
#define ${sym}_FIRST $inum /* Added in $intr */
EOS
;
my $irm = str2num($rm);
if($rm) {
print <<EOS
#define ${sym}_LAST $irm /* Last featured in $rm */
EOS
;
}
}
}