From 225c6b2420e01dca1f3a570d3ed664b825cf883c Mon Sep 17 00:00:00 2001
From: Martin Pitt <martin@piware.de>
Date: Fri, 27 Aug 2021 07:09:50 +0200
Subject: [PATCH] C from Rust: Reference C programs

---
 .gitignore                    |  5 +++++
 call-c-from-rust/Makefile     | 21 +++++++++++++++++++++
 call-c-from-rust/c-langinfo.c | 12 ++++++++++++
 call-c-from-rust/c-mounts.c   | 31 +++++++++++++++++++++++++++++++
 4 files changed, 69 insertions(+)
 create mode 100644 call-c-from-rust/Makefile
 create mode 100644 call-c-from-rust/c-langinfo.c
 create mode 100644 call-c-from-rust/c-mounts.c

diff --git a/.gitignore b/.gitignore
index fa8d85a..5c03031 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,7 @@
+*.o
+
 Cargo.lock
 target
+
+c-langinfo
+c-mounts
diff --git a/call-c-from-rust/Makefile b/call-c-from-rust/Makefile
new file mode 100644
index 0000000..583e2f2
--- /dev/null
+++ b/call-c-from-rust/Makefile
@@ -0,0 +1,21 @@
+CFLAGS += $(shell pkg-config --cflags mount)
+LIBMOUNT = $(shell pkg-config --libs mount)
+
+all: c-mounts c-langinfo
+
+c-mounts: c-mounts.o
+	$(CC) -Wall -o $@ $^ $(LIBMOUNT)
+
+c-langinfo: c-langinfo.o
+	$(CC) -Wall -o $@ $^
+
+clean:
+	rm -f c-mounts c-langinfo *.o
+
+run: all
+	LANG=en_US.UTF-8 ./c-langinfo
+	LANG=en_GB.UTF-8 ./c-langinfo
+	LANG=en_IE.UTF-8 ./c-langinfo
+	./c-mounts
+
+.PHONY: clean run
diff --git a/call-c-from-rust/c-langinfo.c b/call-c-from-rust/c-langinfo.c
new file mode 100644
index 0000000..dacb763
--- /dev/null
+++ b/call-c-from-rust/c-langinfo.c
@@ -0,0 +1,12 @@
+#include <langinfo.h>
+#include <locale.h>
+#include <stdio.h>
+
+int main()
+{
+    printf("locale: %s\n", setlocale (LC_ALL, ""));
+    printf("codeset: %s\n", nl_langinfo(CODESET));
+    printf("date/time format: %s\n", nl_langinfo(D_T_FMT));
+    printf("currency: %s\n", nl_langinfo(CRNCYSTR));
+    return 0;
+}
diff --git a/call-c-from-rust/c-mounts.c b/call-c-from-rust/c-mounts.c
new file mode 100644
index 0000000..0896239
--- /dev/null
+++ b/call-c-from-rust/c-mounts.c
@@ -0,0 +1,31 @@
+#include <stdio.h>
+#include <err.h>
+#include <string.h>
+#include <libmount.h>
+
+int
+main()
+{
+    int r;
+    const char *version;
+
+    r = mnt_get_library_version(&version);
+    if (r < 0)
+        errx(1, "failed to get lib versino: %s", strerror (-r));
+    printf("libmount version: %s\n", version);
+
+    struct libmnt_table *table = mnt_new_table();
+    r = mnt_table_parse_mtab (table, NULL);
+    if (r < 0)
+        errx(1, "failed to parse mtab: %s", strerror (-r));
+
+    struct libmnt_fs *fs;
+    r = mnt_table_first_fs(table, &fs);
+    if (r < 0)
+        errx(1, "failed to find first fs: %s", strerror (-r));
+    printf("first fs type: %s source: %s target: %s\n", mnt_fs_get_fstype(fs), mnt_fs_get_source(fs), mnt_fs_get_target(fs));
+    mnt_free_fs(fs);
+
+    mnt_free_table(table);
+    return 0;
+}
-- 
2.39.2