[Intel-gfx] [PATCH 05/12] drm/i915: Add DEFINE_SNPRINTF_ARRAY()

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Templatize snprintf_int_array() to allow us to print
different kinds of arrays without having to type all
the boilerplate for the snprintf() loop.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_utils.h | 16 ++++++++++++++++
 drivers/gpu/drm/i915/intel_dp.c   | 17 ++---------------
 2 files changed, 18 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_utils.h b/drivers/gpu/drm/i915/i915_utils.h
index 5858a43e19da..079aefa20bee 100644
--- a/drivers/gpu/drm/i915/i915_utils.h
+++ b/drivers/gpu/drm/i915/i915_utils.h
@@ -161,4 +161,20 @@ static inline const char *enableddisabled(bool v)
 	return v ? "enabled" : "disabled";
 }
 
+#define DEFINE_SNPRINTF_ARRAY(name, type, values, index, fmt, ...) \
+void name(char *_str, size_t _len, const type *values, int _nelems) \
+{ \
+	int index; \
+	if (_len) \
+		_str[0] = '\0'; \
+	for (index = 0; index < _nelems; index++) { \
+		int _r = snprintf(_str, _len, "%s" fmt, \
+				  index ? ", " : "", __VA_ARGS__); \
+		if (_r >= _len) \
+			return; \
+		_str += _r; \
+		_len -= _r; \
+	} \
+}
+
 #endif /* !__I915_UTILS_H */
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 13ff89be6ad6..dd8634b40179 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1774,21 +1774,8 @@ intel_dp_set_clock(struct intel_encoder *encoder,
 	}
 }
 
-static void snprintf_int_array(char *str, size_t len,
-			       const int *array, int nelem)
-{
-	int i;
-
-	str[0] = '\0';
-
-	for (i = 0; i < nelem; i++) {
-		int r = snprintf(str, len, "%s%d", i ? ", " : "", array[i]);
-		if (r >= len)
-			return;
-		str += r;
-		len -= r;
-	}
-}
+static DEFINE_SNPRINTF_ARRAY(snprintf_int_array,
+			     int, array, i, "%d", array[i]);
 
 static void intel_dp_print_rates(struct intel_dp *intel_dp)
 {
-- 
2.18.1