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Add two macros for char*-based pointer arithmetic and use it in font.c

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This fixes errornous pointer addition (+ on a short*), which crashed in some situation.
Fixes FS#12317 and should hopefully get the clips booting again.

Thanks to Jonathan Gordon for spotting the bad pointer arithmetic.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30724 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thomas Martitz 2011-10-07 19:29:18 +00:00
parent 42a33a7f70
commit 5783505b99
2 changed files with 13 additions and 14 deletions
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2
firmware/export/system.h
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@ -124,6 +124,8 @@ int get_cpu_boost_counter(void);
ptr = (typeof(ptr))tmp_ptr1; \
}
#define PTR_ADD(ptr, x) ((typeof(ptr))((char*)(ptr) + (x)))
#define PTR_SUB(ptr, x) ((typeof(ptr))((char*)(ptr) - (x)))
/* newer? SDL includes endian.h, So we ignore it */
#if (CONFIG_PLATFORM & PLATFORM_HOSTED) || defined(__PCTOOL__)

25
firmware/font.c
View file

@ -88,26 +88,23 @@ static int buflibmove_callback(int handle, void* current, void* new)
{
(void)handle;
struct buflib_alloc_data *alloc = (struct buflib_alloc_data*)current;
size_t diff = new - current;
ptrdiff_t diff = new - current;
if (alloc->handle_locked)
return BUFLIB_CB_CANNOT_MOVE;
if (alloc->font.bits)
alloc->font.bits += diff;
if (alloc->font.offset)
alloc->font.offset += diff;
if (alloc->font.width)
alloc->font.width += diff;
#define UPDATE(x) if (x) { x = PTR_ADD(x, diff); }
alloc->font.buffer_start += diff;
alloc->font.buffer_end += diff;
alloc->font.buffer_position += diff;
UPDATE(alloc->font.bits);
UPDATE(alloc->font.offset);
UPDATE(alloc->font.width);
if (alloc->font.cache._index)
alloc->font.cache._index += diff;
if (alloc->font.cache._lru._base)
alloc->font.cache._lru._base += diff;
UPDATE(alloc->font.buffer_start);
UPDATE(alloc->font.buffer_end);
UPDATE(alloc->font.buffer_position);
UPDATE(alloc->font.cache._index);
UPDATE(alloc->font.cache._lru._base);
return BUFLIB_CB_OK;
}