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228 lines
9.1 KiB
C
228 lines
9.1 KiB
C
/*
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lfs_alias: Aliases to the small/native API functions with the size of long int as suffix.
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copyright 2010-2013 by the mpg123 project - free software under the terms of the LGPL 2.1
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see COPYING and AUTHORS files in distribution or http://mpg123.org
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initially written by Thomas Orgis
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Use case: Client code on Linux/x86-64 that defines _FILE_OFFSET_BITS to 64,
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which is the only choice on that platform anyway. It should be no-op, but
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prompts the platform-agnostic header of mpg123 to define API calls with the
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corresponding suffix. This file provides the names for this case. It's cruft,
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but glibc does it, too -- so people rely on it.
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Oh, and it also caters for the lunatics that define _FILE_OFFSET_BITS=32 on
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32 bit platforms. In addition, it's needed for platforms that always have
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off_t /= long, and clients still insisting on defining _FILE_OFFSET_BITS.
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Depending on use case, the aliases map to 32 (small) or 64 bit (large) offset
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functions, to the ones from libmpg123 or the ones from lfs_wrap.
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So, two basic cases:
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1. mpg123_bla_32 alias for mpg123_bla (native)
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2. mpg123_bla alias for mpg123_bla_32 (wrapper)
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Same for 64 bits. Confusing, I know. It sucks.
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Note that the mpg123 header is _not_ used here to avoid definition with whacky off_t.
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The aliases are always about arguments of native alias_t type. This can be off_t, but
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on Linux/x86, this is long int. The off_t declarations in mpg123.h confuse things,
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so reproduce definitions for the wrapper functions in that case. The definitions are
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pulled by an inline Perl script in any case ... no need to copy anything manually!
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As a benefit, one can skip undefining possible largefile namings.
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*/
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#include "config.h"
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/* Hack for Solaris: Some system headers included from compat.h might force _FILE_OFFSET_BITS. Need to follow that here.
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Also, want it around to have types defined. */
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#include "compat.h"
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#ifndef LFS_ALIAS_BITS
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#error "I need the count of alias bits here."
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#endif
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#define MACROCAT_REALLY(a, b) a ## b
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#define MACROCAT(a, b) MACROCAT_REALLY(a, b)
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/* This is wicked switchery: Decide which way the aliases are facing. */
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#if _FILE_OFFSET_BITS+0 == LFS_ALIAS_BITS
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/* The native functions have suffix, the aliases not. */
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#define NATIVE_SUFFIX MACROCAT(_, _FILE_OFFSET_BITS)
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#define NATIVE_NAME(func) MACROCAT(func, NATIVE_SUFFIX)
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#define ALIAS_NAME(func) func
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#else
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/* The alias functions have suffix, the native ones not. */
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#define ALIAS_SUFFIX MACROCAT(_, LFS_ALIAS_BITS)
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#define ALIAS_NAME(func) MACROCAT(func, ALIAS_SUFFIX)
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#define NATIVE_NAME(func) func
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#endif
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/* Copy of necessary definitions, actually just forward declarations. */
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struct mpg123_handle_struct;
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typedef struct mpg123_handle_struct mpg123_handle;
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/* Get attribute_align_arg, to stay safe. */
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#include "abi_align.h"
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/*
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Extract the list of functions we need wrappers for, pregenerating the wrappers for simple cases (inline script for nedit):
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perl -ne '
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if(/^\s*MPG123_EXPORT\s+(\S+)\s+(mpg123_\S+)\((.*)\);\s*$/)
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{
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my $type = $1;
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my $name = $2;
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my $args = $3;
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next unless ($type =~ /off_t/ or $args =~ /off_t/ or ($name =~ /open/ and $name ne mpg123_open_feed));
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$type =~ s/off_t/lfs_alias_t/g;
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my @nargs = ();
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$args =~ s/off_t/lfs_alias_t/g;
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foreach my $a (split(/,/, $args))
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{
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$a =~ s/^.*\s\**([a-z_]+)$/$1/;
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push(@nargs, $a);
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}
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my $nargs = join(", ", @nargs);
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$nargs = "Human: figure me out." if($nargs =~ /\(/);
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print <<EOT
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$type NATIVE_NAME($name)($args);
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$type attribute_align_arg ALIAS_NAME($name)($args)
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{
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return NATIVE_NAME($name)($nargs);
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}
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EOT
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}' < mpg123.h.in
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*/
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int NATIVE_NAME(mpg123_open)(mpg123_handle *mh, const char *path);
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int attribute_align_arg ALIAS_NAME(mpg123_open)(mpg123_handle *mh, const char *path)
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{
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return NATIVE_NAME(mpg123_open)(mh, path);
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}
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int NATIVE_NAME(mpg123_open_fd)(mpg123_handle *mh, int fd);
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int attribute_align_arg ALIAS_NAME(mpg123_open_fd)(mpg123_handle *mh, int fd)
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{
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return NATIVE_NAME(mpg123_open_fd)(mh, fd);
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}
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int NATIVE_NAME(mpg123_open_handle)(mpg123_handle *mh, void *iohandle);
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int attribute_align_arg ALIAS_NAME(mpg123_open_handle)(mpg123_handle *mh, void *iohandle)
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{
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return NATIVE_NAME(mpg123_open_handle)(mh, iohandle);
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}
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int NATIVE_NAME(mpg123_decode_frame)(mpg123_handle *mh, lfs_alias_t *num, unsigned char **audio, size_t *bytes);
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int attribute_align_arg ALIAS_NAME(mpg123_decode_frame)(mpg123_handle *mh, lfs_alias_t *num, unsigned char **audio, size_t *bytes)
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{
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return NATIVE_NAME(mpg123_decode_frame)(mh, num, audio, bytes);
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}
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int NATIVE_NAME(mpg123_framebyframe_decode)(mpg123_handle *mh, lfs_alias_t *num, unsigned char **audio, size_t *bytes);
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int attribute_align_arg ALIAS_NAME(mpg123_framebyframe_decode)(mpg123_handle *mh, lfs_alias_t *num, unsigned char **audio, size_t *bytes)
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{
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return NATIVE_NAME(mpg123_framebyframe_decode)(mh, num, audio, bytes);
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}
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lfs_alias_t NATIVE_NAME(mpg123_framepos)(mpg123_handle *mh);
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lfs_alias_t attribute_align_arg ALIAS_NAME(mpg123_framepos)(mpg123_handle *mh)
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{
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return NATIVE_NAME(mpg123_framepos)(mh);
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}
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lfs_alias_t NATIVE_NAME(mpg123_tell)(mpg123_handle *mh);
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lfs_alias_t attribute_align_arg ALIAS_NAME(mpg123_tell)(mpg123_handle *mh)
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{
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return NATIVE_NAME(mpg123_tell)(mh);
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}
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lfs_alias_t NATIVE_NAME(mpg123_tellframe)(mpg123_handle *mh);
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lfs_alias_t attribute_align_arg ALIAS_NAME(mpg123_tellframe)(mpg123_handle *mh)
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{
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return NATIVE_NAME(mpg123_tellframe)(mh);
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}
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lfs_alias_t NATIVE_NAME(mpg123_tell_stream)(mpg123_handle *mh);
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lfs_alias_t attribute_align_arg ALIAS_NAME(mpg123_tell_stream)(mpg123_handle *mh)
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{
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return NATIVE_NAME(mpg123_tell_stream)(mh);
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}
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lfs_alias_t NATIVE_NAME(mpg123_seek)(mpg123_handle *mh, lfs_alias_t sampleoff, int whence);
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lfs_alias_t attribute_align_arg ALIAS_NAME(mpg123_seek)(mpg123_handle *mh, lfs_alias_t sampleoff, int whence)
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{
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return NATIVE_NAME(mpg123_seek)(mh, sampleoff, whence);
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}
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lfs_alias_t NATIVE_NAME(mpg123_feedseek)(mpg123_handle *mh, lfs_alias_t sampleoff, int whence, lfs_alias_t *input_offset);
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lfs_alias_t attribute_align_arg ALIAS_NAME(mpg123_feedseek)(mpg123_handle *mh, lfs_alias_t sampleoff, int whence, lfs_alias_t *input_offset)
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{
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return NATIVE_NAME(mpg123_feedseek)(mh, sampleoff, whence, input_offset);
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}
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lfs_alias_t NATIVE_NAME(mpg123_seek_frame)(mpg123_handle *mh, lfs_alias_t frameoff, int whence);
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lfs_alias_t attribute_align_arg ALIAS_NAME(mpg123_seek_frame)(mpg123_handle *mh, lfs_alias_t frameoff, int whence)
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{
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return NATIVE_NAME(mpg123_seek_frame)(mh, frameoff, whence);
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}
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lfs_alias_t NATIVE_NAME(mpg123_timeframe)(mpg123_handle *mh, double sec);
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lfs_alias_t attribute_align_arg ALIAS_NAME(mpg123_timeframe)(mpg123_handle *mh, double sec)
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{
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return NATIVE_NAME(mpg123_timeframe)(mh, sec);
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}
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int NATIVE_NAME(mpg123_index)(mpg123_handle *mh, lfs_alias_t **offsets, lfs_alias_t *step, size_t *fill);
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int attribute_align_arg ALIAS_NAME(mpg123_index)(mpg123_handle *mh, lfs_alias_t **offsets, lfs_alias_t *step, size_t *fill)
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{
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return NATIVE_NAME(mpg123_index)(mh, offsets, step, fill);
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}
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int NATIVE_NAME(mpg123_set_index)(mpg123_handle *mh, lfs_alias_t *offsets, lfs_alias_t step, size_t fill);
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int attribute_align_arg ALIAS_NAME(mpg123_set_index)(mpg123_handle *mh, lfs_alias_t *offsets, lfs_alias_t step, size_t fill)
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{
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return NATIVE_NAME(mpg123_set_index)(mh, offsets, step, fill);
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}
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int NATIVE_NAME(mpg123_position)( mpg123_handle *mh, lfs_alias_t frame_offset, lfs_alias_t buffered_bytes, lfs_alias_t *current_frame, lfs_alias_t *frames_left, double *current_seconds, double *seconds_left);
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int attribute_align_arg ALIAS_NAME(mpg123_position)( mpg123_handle *mh, lfs_alias_t frame_offset, lfs_alias_t buffered_bytes, lfs_alias_t *current_frame, lfs_alias_t *frames_left, double *current_seconds, double *seconds_left)
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{
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return NATIVE_NAME(mpg123_position)(mh, frame_offset, buffered_bytes, current_frame, frames_left, current_seconds, seconds_left);
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}
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lfs_alias_t NATIVE_NAME(mpg123_framelength)(mpg123_handle *mh);
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lfs_alias_t attribute_align_arg ALIAS_NAME(mpg123_framelength)(mpg123_handle *mh)
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{
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return NATIVE_NAME(mpg123_framelength)(mh);
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}
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lfs_alias_t NATIVE_NAME(mpg123_length)(mpg123_handle *mh);
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lfs_alias_t attribute_align_arg ALIAS_NAME(mpg123_length)(mpg123_handle *mh)
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{
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return NATIVE_NAME(mpg123_length)(mh);
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}
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int NATIVE_NAME(mpg123_set_filesize)(mpg123_handle *mh, lfs_alias_t size);
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int attribute_align_arg ALIAS_NAME(mpg123_set_filesize)(mpg123_handle *mh, lfs_alias_t size)
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{
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return NATIVE_NAME(mpg123_set_filesize)(mh, size);
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}
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int NATIVE_NAME(mpg123_replace_reader)(mpg123_handle *mh, ssize_t (*r_read) (int, void *, size_t), lfs_alias_t (*r_lseek)(int, lfs_alias_t, int));
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int attribute_align_arg ALIAS_NAME(mpg123_replace_reader)(mpg123_handle *mh, ssize_t (*r_read) (int, void *, size_t), lfs_alias_t (*r_lseek)(int, lfs_alias_t, int))
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{
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return NATIVE_NAME(mpg123_replace_reader)(mh, r_read, r_lseek);
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}
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int NATIVE_NAME(mpg123_replace_reader_handle)(mpg123_handle *mh, ssize_t (*r_read) (void *, void *, size_t), lfs_alias_t (*r_lseek)(void *, lfs_alias_t, int), void (*cleanup)(void*));
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int attribute_align_arg ALIAS_NAME(mpg123_replace_reader_handle)(mpg123_handle *mh, ssize_t (*r_read) (void *, void *, size_t), lfs_alias_t (*r_lseek)(void *, lfs_alias_t, int), void (*cleanup)(void*))
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{
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return NATIVE_NAME(mpg123_replace_reader_handle)(mh, r_read, r_lseek, cleanup);
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}
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