Don't use buf_size as input and output in encode

1 files changed, 9 insertions, 8 deletions

diff --git a/include/grpc/census.h b/include/grpc/census.h
index 6e4fa5a825..ab0e0e4802 100644
--- a/include/grpc/census.h
+++ b/include/grpc/census.h
@@ -438,19 +438,20 @@ int census_tag_set_get_tag_by_key(const census_tag_set *tags, const char *key,
    @param tags tag set to be encoded
    @param buffer pointer to buffer. This address will be used to encode the
                  printable tags.
-   @param buf_size On input, will be a pointer to total buffer size. On output,
-                   will be set to total number of bytes consumed by printable
-                   tags.
-   @param bin_buf_size on output, will be set to the number of bytes used to
-                       encode the binary tags.
+   @param buf_size number of available bytes in buffer.
+   @param print_buf_size Will be set to the number of bytes consumed by
+                         printable tags.
+   @param bin_buf_size Will be set to the number of bytes used to encode the
+                       binary tags.
    @return A pointer to the binary tag's encoded, or NULL if the buffer was
            insufficiently large to hold the encoded tags. Thus, if successful,
            printable tags are encoded into
-           [buffer, buffer + *buf_size) and binary tags into
+           [buffer, buffer + *print_buf_size) and binary tags into
            [returned-ptr, returned-ptr + *bin_buf_size) (and the return value
-           should be buffer + *buf_size) */
+           should be buffer + *print_buf_size) */
 char *census_tag_set_encode(const census_tag_set *tags, char *buffer,
-                            size_t *buf_size, size_t *bin_buf_size);
+                            size_t buf_size, size_t *print_buf_size,
+                            size_t *bin_buf_size);
 
 /* Decode tag set buffers encoded with census_tag_set_encode_*(). Returns NULL
    if there is an error in parsing either buffer. */