Add macros similar to min/max/min_t/max_t
Also, change the variable names used in the min/max macros to avoid shadowed variable warnings when min/max min_t/max_t are nested. Small formatting changes to make all the macros have a similar form. [akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: fix v4l build] Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Cc: Mauro Carvalho Chehab <mchehab@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> Cc: Jeff Garzik <jeff@garzik.org> Cc: Tejun Heo <htejun@gmail.com> Cc: Michael Buesch <mb@bu3sch.de> Cc: "John W. Linville" <linville@tuxdriver.com> Cc: Miklos Szeredi <miklos@szeredi.hu> Cc: Dmitry Torokhov <dtor@mail.ru> Cc: Jiri Kosina <jkosina@suse.cz> Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Cc: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -81,8 +81,6 @@
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/* Limits scaled width, which must be a multiple of 4. */
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#define MAX_HACTIVE (0x3FF & -4)
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#define clamp(x, low, high) min (max (low, x), high)
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#define BTTV_NORMS (\
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V4L2_STD_PAL | V4L2_STD_PAL_N | \
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V4L2_STD_PAL_Nc | V4L2_STD_SECAM | \
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@ -70,12 +70,6 @@
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#define VICAM_HEADER_SIZE 64
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#define clamp( x, l, h ) max_t( __typeof__( x ), \
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( l ), \
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min_t( __typeof__( x ), \
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( h ), \
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( x ) ) )
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/* Not sure what all the bytes in these char
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* arrays do, but they're necessary to make
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* the camera work.
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@ -338,33 +338,90 @@ extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
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#endif /* __LITTLE_ENDIAN */
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/*
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* min()/max() macros that also do
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* min()/max()/clamp() macros that also do
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* strict type-checking.. See the
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* "unnecessary" pointer comparison.
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*/
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#define min(x, y) ({ \
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typeof(x) _x = (x); \
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typeof(y) _y = (y); \
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(void) (&_x == &_y); \
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_x < _y ? _x : _y; })
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typeof(x) _min1 = (x); \
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typeof(y) _min2 = (y); \
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(void) (&_min1 == &_min2); \
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_min1 < _min2 ? _min1 : _min2; })
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#define max(x, y) ({ \
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typeof(x) _x = (x); \
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typeof(y) _y = (y); \
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(void) (&_x == &_y); \
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_x > _y ? _x : _y; })
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typeof(x) _max1 = (x); \
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typeof(y) _max2 = (y); \
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(void) (&_max1 == &_max2); \
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_max1 > _max2 ? _max1 : _max2; })
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/**
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* clamp - return a value clamped to a given range with strict typechecking
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* @val: current value
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* @min: minimum allowable value
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* @max: maximum allowable value
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*
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* This macro does strict typechecking of min/max to make sure they are of the
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* same type as val. See the unnecessary pointer comparisons.
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*/
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#define clamp(val, min, max) ({ \
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typeof(val) __val = (val); \
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typeof(min) __min = (min); \
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typeof(max) __max = (max); \
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(void) (&__val == &__min); \
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(void) (&__val == &__max); \
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__val = __val < __min ? __min: __val; \
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__val > __max ? __max: __val; })
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/*
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* ..and if you can't take the strict
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* types, you can specify one yourself.
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*
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* Or not use min/max at all, of course.
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* Or not use min/max/clamp at all, of course.
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*/
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#define min_t(type,x,y) \
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({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
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#define max_t(type,x,y) \
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({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
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#define min_t(type, x, y) ({ \
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type __min1 = (x); \
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type __min2 = (y); \
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__min1 < __min2 ? __min1: __min2; })
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#define max_t(type, x, y) ({ \
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type __max1 = (x); \
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type __max2 = (y); \
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__max1 > __max2 ? __max1: __max2; })
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/**
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* clamp_t - return a value clamped to a given range using a given type
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* @type: the type of variable to use
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* @val: current value
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* @min: minimum allowable value
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* @max: maximum allowable value
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*
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* This macro does no typechecking and uses temporary variables of type
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* 'type' to make all the comparisons.
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*/
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#define clamp_t(type, val, min, max) ({ \
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type __val = (val); \
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type __min = (min); \
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type __max = (max); \
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__val = __val < __min ? __min: __val; \
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__val > __max ? __max: __val; })
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/**
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* clamp_val - return a value clamped to a given range using val's type
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* @val: current value
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* @min: minimum allowable value
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* @max: maximum allowable value
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*
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* This macro does no typechecking and uses temporary variables of whatever
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* type the input argument 'val' is. This is useful when val is an unsigned
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* type and min and max are literals that will otherwise be assigned a signed
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* integer type.
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*/
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#define clamp_val(val, min, max) ({ \
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typeof(val) __val = (val); \
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typeof(val) __min = (min); \
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typeof(val) __max = (max); \
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__val = __val < __min ? __min: __val; \
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__val > __max ? __max: __val; })
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/**
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* container_of - cast a member of a structure out to the containing structure
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