utils: move OSMO_SNPRINT_RET() macro definition to osmocom/core/utils.h
This is used by the logging to vty conversion functions by now, but it
may be of help for other functions that plan to use snprintf().
diff --git a/include/osmocom/core/utils.h b/include/osmocom/core/utils.h
index 0cdf03b..252228d 100644
--- a/include/osmocom/core/utils.h
+++ b/include/osmocom/core/utils.h
@@ -27,4 +27,13 @@
void osmo_str2lower(char *out, const char *in);
void osmo_str2upper(char *out, const char *in);
+#define OSMO_SNPRINTF_RET(ret, rem, offset, len) \
+do { \
+ len += ret; \
+ if (ret > rem) \
+ ret = rem; \
+ offset += ret; \
+ rem -= ret; \
+} while (0)
+
#endif