srsran_vec_sprint_hex returns number of written characters

lib/include/srsran/phy/utils/vector.h

@@ -131,7 +131,7 @@ SRSRAN_API void srsran_vec_fprint_byte(FILE* stream, const uint8_t* x, const uin
 SRSRAN_API void     srsran_vec_fprint_i(FILE* stream, const int* x, const uint32_t len);
 SRSRAN_API void     srsran_vec_fprint_s(FILE* stream, const int16_t* x, const uint32_t len);
 SRSRAN_API void     srsran_vec_fprint_hex(FILE* stream, uint8_t* x, const uint32_t len);
-SRSRAN_API void srsran_vec_sprint_hex(char* str, const uint32_t max_str_len, uint8_t* x, const uint32_t len);
+SRSRAN_API uint32_t srsran_vec_sprint_hex(char* str, const uint32_t max_str_len, uint8_t* x, const uint32_t len);
 SRSRAN_API void     srsran_vec_sprint_bin(char* str, const uint32_t max_str_len, const uint8_t* x, const uint32_t len);
 
 /* Saves/loads a vector to a file */

lib/src/phy/utils/vector.c

@@ -354,7 +354,7 @@ void srsran_vec_fprint_hex(FILE* stream, uint8_t* x, const uint32_t len)
   fprintf(stream, "];\n");
 }
 
-void srsran_vec_sprint_hex(char* str, const uint32_t max_str_len, uint8_t* x, const uint32_t len)
+uint32_t srsran_vec_sprint_hex(char* str, const uint32_t max_str_len, uint8_t* x, const uint32_t len)
 {
   uint32_t i, nbytes;
   uint8_t  byte;
@@ -362,7 +362,7 @@ void srsran_vec_sprint_hex(char* str, const uint32_t max_str_len, uint8_t* x, co
   // check that hex string fits in buffer (every byte takes 3 characters, plus brackets)
   if ((3 * (len / 8 + ((len % 8) ? 1 : 0))) + 2 >= max_str_len) {
     ERROR("Buffer too small for printing hex string (max_str_len=%d, payload_len=%d).", max_str_len, len);
-    return;
+    return 0;
   }
 
   int n = 0;
@@ -376,7 +376,10 @@ void srsran_vec_sprint_hex(char* str, const uint32_t max_str_len, uint8_t* x, co
     n += sprintf(&str[n], "%02x ", byte);
   }
   n += sprintf(&str[n], "]");
+  str[n]               = 0;
   str[max_str_len - 1] = 0;
+
+  return n;
 }
 
 void srsran_vec_sprint_bin(char* str, const uint32_t max_str_len, const uint8_t* x, const uint32_t len)