From: Rusty Russell <rusty@rustcorp.com.au>
Date: Mon, 9 Jan 2023 02:08:22 +0000 (+1030)
Subject: ccanlint: do fewer reallocs, to speed up under -fsanitize=address
X-Git-Url: https://git.ozlabs.org/?p=ccan;a=commitdiff_plain;h=374a0b73cc507b3121cf40cab77dc0d3eab794a9;hp=523944ee598bfd43b2d2b944ee5b1cd2c7cc18ed

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 f3d1a5ba..3f88bbcd 100644
--- 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;