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buflib: Change buflib_available() and add buflib_allocatable().

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buflib_allocatable() is what buflib_available() was before (it was in fact
simply renamed). It returns the largest contiguous block of memory. This
can be allocated and will definitely succeed, although larger allocations
may also succeed if the buffer can be compacted and shrinked.

buflib_available() now counts all free bytes, contiguous or not. This
better matches the description and how the caller use it.

Change-Id: I511e4eb5f4cf1821d957b3f4ef8a685ce40fe289
Reviewed-on: http://gerrit.rockbox.org/481
Reviewed-by: Thomas Martitz <kugel@rockbox.org>
Tested-by: Thomas Martitz <kugel@rockbox.org>
This commit is contained in:
Thomas Martitz 2013-05-29 07:07:34 +02:00
parent f9e47c6886
commit af4e408555
4 changed files with 41 additions and 7 deletions
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27
firmware/buflib.c
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@ -647,9 +647,9 @@ free_space_at_end(struct buflib_context* ctx)
return 0;
}
/* Return the maximum allocatable memory in bytes */
/* Return the maximum allocatable contiguous memory in bytes */
size_t
buflib_available(struct buflib_context* ctx)
buflib_allocatable(struct buflib_context* ctx)
{
union buflib_data *this;
size_t free_space = 0, max_free_space = 0;
@ -687,6 +687,29 @@ buflib_available(struct buflib_context* ctx)
return 0;
}
/* Return the amount of unallocated memory in bytes (even if not contiguous) */
size_t
buflib_available(struct buflib_context* ctx)
{
union buflib_data *this;
size_t free_space = 0;
/* now look if there's free in holes */
for(this = find_first_free(ctx); this < ctx->alloc_end; this += abs(this->val))
{
if (this->val < 0)
{
free_space += -this->val;
continue;
}
}
free_space *= sizeof(union buflib_data); /* make it bytes */
free_space += free_space_at_end(ctx);
return free_space;
}
/*
* Allocate all available (as returned by buflib_available()) memory and return
* a handle to it