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If BUFFER_ALLOC_DEBUG is defined, make buffer_alloc() not actually allocate anything if size==0, so code that uses buffer_alloc(0) to find out what address it would get keeps working

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28174 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Frank Gevaerts 2010-09-26 12:27:38 +00:00
parent 8ff4f1aec9
commit 74dbb3c27b
1 changed files with 14 additions and 11 deletions
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25
firmware/buffer.c
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@ -72,19 +72,22 @@ void *buffer_alloc(size_t size)
#ifdef BUFFER_ALLOC_DEBUG
retval +=sizeof(struct buffer_start_marker);
end=(struct buffer_end_marker*)(audiobuf - sizeof(struct buffer_end_marker));
if(end->magic == BUF_MAGIC)
if(size>0)
{
end->last=0;
}
start=(struct buffer_start_marker*)audiobuf;
start->magic = BUF_MAGIC;
start->buffer_size = size;
end=(struct buffer_end_marker*)(audiobuf+sizeof(struct buffer_start_marker)+size);
end->magic = BUF_MAGIC;
end->last = 1;
end=(struct buffer_end_marker*)(audiobuf - sizeof(struct buffer_end_marker));
if(end->magic == BUF_MAGIC)
{
end->last=0;
}
start=(struct buffer_start_marker*)audiobuf;
start->magic = BUF_MAGIC;
start->buffer_size = size;
end=(struct buffer_end_marker*)(audiobuf+sizeof(struct buffer_start_marker)+size);
end->magic = BUF_MAGIC;
end->last = 1;
audiobuf = ((unsigned char *)end) + sizeof(struct buffer_end_marker);
audiobuf = ((unsigned char *)end) + sizeof(struct buffer_end_marker);
}
logf("Alloc %x %d",(unsigned int)retval,size);
#else /* !BUFFER_ALLOC_DEBUG */