Move mg_a*printf to common

PUBLISHED_FROM=cccd28ef43ec4e08fa52340ce78bda10db5ac27a

mongoose.h

@@ -1869,6 +1869,26 @@ int mg_ncasecmp(const char *s1, const char *s2, size_t len);
  */
 int mg_casecmp(const char *s1, const char *s2);
 
+/*
+ * Prints message to the buffer. If the buffer is large enough to hold the
+ * message, it returns buffer. If buffer is to small, it allocates a large
+ * enough buffer on heap and returns allocated buffer.
+ * This is a supposed use case:
+ *
+ *    char buf[5], *p = buf;
+ *    mg_avprintf(&p, sizeof(buf), "%s", "hi there");
+ *    use_p_somehow(p);
+ *    if (p != buf) {
+ *      free(p);
+ *    }
+ *
+ * The purpose of this is to avoid malloc-ing if generated strings are small.
+ */
+int mg_asprintf(char **buf, size_t size, const char *fmt, ...);
+
+/* Same as mg_asprintf, but takes varargs list. */
+int mg_avprintf(char **buf, size_t size, const char *fmt, va_list ap);
+
 #ifdef __cplusplus
 }
 #endif
@@ -3763,26 +3783,6 @@ void mg_hexdump_connection(struct mg_connection *nc, const char *path,
                            const void *buf, int num_bytes, int ev);
 #endif
 
-/*
- * Prints message to the buffer. If the buffer is large enough to hold the
- * message, it returns buffer. If buffer is to small, it allocates a large
- * enough buffer on heap and returns allocated buffer.
- * This is a supposed use case:
- *
- *    char buf[5], *p = buf;
- *    mg_avprintf(&p, sizeof(buf), "%s", "hi there");
- *    use_p_somehow(p);
- *    if (p != buf) {
- *      free(p);
- *    }
- *
- * The purpose of this is to avoid malloc-ing if generated strings are small.
- */
-int mg_asprintf(char **buf, size_t size, const char *fmt, ...);
-
-/* Same as mg_asprintf, but takes varargs list. */
-int mg_avprintf(char **buf, size_t size, const char *fmt, va_list ap);
-
 /*
  * Returns true if target platform is big endian.
  */