utils-std

commit: a8363b592dd8eb119ed85e5eeb93b66f59c33c95
parent 3d2b46bceac5de0cd651355dd8bbfb300bfd6548
Author: Haelwenn (lanodan) Monnier <contact@hacktivis.me>
Date:   Sun, 31 Mar 2024 17:24:30 +0200

configure: Add test for splice(2)

Diffstat:
M
Makefile
2
+-
M
configure
19
+++++++++++++++++++
A
configure.d/splice.c
17
+++++++++++++++++

3 files changed, 37 insertions(+), 1 deletion(-)
diff --git a/Makefile b/Makefile
@@ -49,7 +49,7 @@ install: all
 coverage:
 	$(GCOV) -b $(EXE)
 
-C_SOURCES = cmd/*.c lib/*.h lib/*.c
+C_SOURCES = cmd/*.c lib/*.h lib/*.c configure.d/*.c
 format: $(C_SOURCES)
 	clang-format -style=file -assume-filename=.clang-format -i $(C_SOURCES)
 
diff --git a/configure b/configure
@@ -100,6 +100,21 @@ check_header() {
 	is_ok
 }
 
+check_conftest() {
+	conftest="$1"
+
+	printf 'Checking if conftest %s compiles ...' "$conftest"
+
+	out="$(${CC} ${CFLAGS} -c -o /dev/null "${conftest}" 2>&1)"
+	status="$?"
+
+	is_ok
+
+	echo "$out"
+
+	return $status
+}
+
 ## User configuration
 
 # defaults
@@ -231,6 +246,10 @@ if ! check_header mntent.h; then
 	echo 'cmd/df' >> target_filter
 fi
 
+if check_conftest configure.d/splice.c; then
+	CFLAGS="${CFLAGS} -DHAS_SPLICE"
+fi
+
 echo
 
 ## Configuration write
diff --git a/configure.d/splice.c b/configure.d/splice.c
@@ -0,0 +1,17 @@
+// utils-std: Collection of commonly available Unix tools
+// SPDX-FileCopyrightText: 2017 Haelwenn (lanodan) Monnier <contact+utils@hacktivis.me>
+// SPDX-License-Identifier: MPL-2.0
+
+// Because that's what our utilities will use :)
+#define _POSIX_C_SOURCE 200809L
+#define _GNU_SOURCE // for splice
+
+#include <fcntl.h>  // splice
+#include <stdint.h> // SIZE_MAX
+
+ssize_t
+test(int in, int out)
+{
+	off_t in_pos = 0, out_pos = 0;
+	return splice(in, &in_pos, out, &out_pos, SIZE_MAX, 0);
+}