From 9915e08f9bc4122a1d49101fff43be20a2ea6cb5 Mon Sep 17 00:00:00 2001
From: Jeff Hostetler <jeffhost@microsoft.com>
Date: Thu, 26 May 2022 21:47:20 +0000
Subject: [PATCH] t/helper/hexdump: add helper to print hexdump of stdin
Co-authored-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
Makefile | 1 +
t/helper/test-hexdump.c | 30 ++++++++++++++++++++++++++++++
t/helper/test-tool.c | 1 +
t/helper/test-tool.h | 1 +
4 files changed, 33 insertions(+)
create mode 100644 t/helper/test-hexdump.c
diff --git a/Makefile b/Makefile
index 5f1623baad..5afa194aac 100644
--- a/Makefile
+++ b/Makefile
@@ -729,6 +729,7 @@ TEST_BUILTINS_OBJS += test-getcwd.o
TEST_BUILTINS_OBJS += test-hash-speed.o
TEST_BUILTINS_OBJS += test-hash.o
TEST_BUILTINS_OBJS += test-hashmap.o
+TEST_BUILTINS_OBJS += test-hexdump.o
TEST_BUILTINS_OBJS += test-index-version.o
TEST_BUILTINS_OBJS += test-json-writer.o
TEST_BUILTINS_OBJS += test-lazy-init-name-hash.o
diff --git a/t/helper/test-hexdump.c b/t/helper/test-hexdump.c
new file mode 100644
index 0000000000..811e89c1bc
--- /dev/null
+++ b/t/helper/test-hexdump.c
@@ -0,0 +1,30 @@
+#include "test-tool.h"
+#include "git-compat-util.h"
+
+/*
+ * Read stdin and print a hexdump to stdout.
+ */
+int cmd__hexdump(int argc, const char **argv)
+{
+ char buf[1024];
+ ssize_t i, len;
+ int have_data = 0;
+
+ for (;;) {
+ len = xread(0, buf, sizeof(buf));
+ if (len < 0)
+ die_errno("failure reading stdin");
+ if (!len)
+ break;
+
+ have_data = 1;
+
+ for (i = 0; i < len; i++)
+ printf("%02x ", (unsigned char)buf[i]);
+ }
+
+ if (have_data)
+ putchar('\n');
+
+ return 0;
+}
diff --git a/t/helper/test-tool.c b/t/helper/test-tool.c
index 0424f7adf5..88c4b28cdf 100644
--- a/t/helper/test-tool.c
+++ b/t/helper/test-tool.c
@@ -38,6 +38,7 @@ static struct test_cmd cmds[] = {
{ "getcwd", cmd__getcwd },
{ "hashmap", cmd__hashmap },
{ "hash-speed", cmd__hash_speed },
+ { "hexdump", cmd__hexdump },
{ "index-version", cmd__index_version },
{ "json-writer", cmd__json_writer },
{ "lazy-init-name-hash", cmd__lazy_init_name_hash },
diff --git a/t/helper/test-tool.h b/t/helper/test-tool.h
index c876e8246f..511f6251bf 100644
--- a/t/helper/test-tool.h
+++ b/t/helper/test-tool.h
@@ -29,6 +29,7 @@ int cmd__genzeros(int argc, const char **argv);
int cmd__getcwd(int argc, const char **argv);
int cmd__hashmap(int argc, const char **argv);
int cmd__hash_speed(int argc, const char **argv);
+int cmd__hexdump(int argc, const char **argv);
int cmd__index_version(int argc, const char **argv);
int cmd__json_writer(int argc, const char **argv);
int cmd__lazy_init_name_hash(int argc, const char **argv);