utils: add osmo_escape_str()
To report invalid characters in identifiers, it is desirable to escape any
weird characters. Otherwise we might print stray newlines or control characters
in the log output.
ctrl_test.c already uses a print_escaped() function, which will be replaced by
osmo_escape_str() in a subsequent patch.
control_cmd.c will use osmo_escape_str() to log invalid identifiers.
Change-Id: Ic685eb63dead3967d01aaa4f1e9899e5461ca49a
diff --git a/include/osmocom/core/utils.h b/include/osmocom/core/utils.h
index 0973b4c..72266ae 100644
--- a/include/osmocom/core/utils.h
+++ b/include/osmocom/core/utils.h
@@ -120,4 +120,7 @@
bool osmo_identifier_valid(const char *str);
bool osmo_separated_identifiers_valid(const char *str, const char *sep_chars);
+const char *osmo_escape_str(const char *str, int len);
+const char *osmo_escape_str_buf(const char *str, int in_len, char *buf, size_t bufsize);
+
/*! @} */