Introduce METER_BUFFER_CHECK and METER_BUFFER_APPEND_CHR to cleanup writing to bar buffers
Closes: #294
diff --git a/Meter.h b/Meter.h
index 13cbebb..cb05405 100644
--- a/Meter.h
+++ b/Meter.h
@@ -20,6 +20,29 @@
#define METER_BUFFER_LEN 256
+#define METER_BUFFER_CHECK(buffer, size, written) \
+ do { \
+ if ((written) < 0 || (size_t)(written) >= (size)) { \
+ return; \
+ } \
+ (buffer) += (written); \
+ (size) -= (size_t)(written); \
+ } while (0)
+
+#define METER_BUFFER_APPEND_CHR(buffer, size, c) \
+ do { \
+ if ((size) < 2) { \
+ return; \
+ } \
+ *(buffer)++ = c; \
+ *(buffer) = '\0'; \
+ (size)--; \
+ if ((size) == 0) { \
+ return; \
+ } \
+ } while (0)
+
+
struct Meter_;
typedef struct Meter_ Meter;