ccanlint: do fewer reallocs, to speed up under -fsanitize=address

This is just a hack, but it makes the speed managable for ccan/utf8
which produces a lot of output!

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff --git a/tools/ccanlint/async.c b/tools/ccanlint/async.c
index f3d1a5ba13b36354d23bdf309ae28d8c75617bd3..3f88bbcdf830d0ca7afbd9e4214936e6940a1f9d 100644 (file)
--- a/tools/ccanlint/async.c
+++ b/tools/ccanlint/async.c
@@ -151,11 +151,12 @@ static void reap_output(void)
                        int old_len, len;
                        /* This length includes nul terminator! */
                        old_len = tal_count(c->output);
-                       tal_resize(&c->output, old_len + 1024);
-                       len = read(c->output_fd, c->output + old_len - 1, 1024);
+                       tal_resize(&c->output, old_len + 65536);
+                       len = read(c->output_fd, c->output + old_len - 1, 65536);
                        if (len < 0)
                                err(1, "Reading from async command");
-                       tal_resize(&c->output, old_len + len);
+                       if (len != 65536)
+                               tal_resize(&c->output, old_len + len);
                        c->output[old_len + len - 1] = '\0';
                        if (len == 0) {
                                struct rusage ru;