utils: new write_str_buf() helper function

Signed-off-by: Eduardo Silva <[email protected]>

include/fluent-bit/flb_utils.h

@@ -54,5 +54,6 @@ void flb_utils_bytes_to_human_readable_size(size_t bytes,
 int flb_utils_time_split(char *time, int *sec, long *nsec);
 int flb_utils_write_str(char *buf, int *off, size_t size,
  char *str, size_t str_len);
+int flb_utils_write_str_buf(char *str, size_t str_len, char **out, size_t *out_size);
 
 #endif

src/flb_utils.c

@@ -619,3 +619,43 @@ int flb_utils_write_str(char *buf, int *off, size_t size,
  *off += written;
  return FLB_TRUE;
 }
+
+
+int flb_utils_write_str_buf(char *str, size_t str_len, char **out, size_t *out_size)
+{
+ int ret;
+ int off;
+ char *tmp;
+ char *buf;
+ size_t s;
+
+ s = str_len + 1;
+ buf = flb_malloc(s);
+ if (!buf) {
+ flb_errno();
+ return -1;
+ }
+
+ while (1) {
+ off = 0;
+ ret = flb_utils_write_str(buf, &off, s, str, str_len);
+ if (ret == FLB_FALSE) {
+ s += 256;
+ tmp = flb_realloc(buf, s);
+ if (!tmp) {
+ flb_errno();
+ flb_free(buf);
+ return -1;
+ }
+ buf = tmp;
+ }
+ else {
+ /* done */
+ break;
+ }
+ }
+
+ *out = buf;
+ *out_size = off;
+ return 0;
+}