Add example for command line parser [skip-ci]

.gitignore

@@ -30,6 +30,7 @@
 /tests/test*.log
 /tests/test*.trs
 
+/examples/cmdline
 /tests/multiboot2_print1
 /tests/multiboot2_print2
 /tests/test_cmdline

Makefile.am

@@ -14,6 +14,7 @@ TESTS = \
 
 noinst_PROGRAMS = \
 	$(TESTS) \
+	examples/cmdline \
 	tests/multiboot2_print1 \
 	tests/multiboot2_print2
 
@@ -30,6 +31,10 @@ if ARCH_X86
 libkernaux_a_SOURCES += src/arch/x86.S
 endif
 
+examples_cmdline_SOURCES = \
+	$(libkernaux_a_SOURCES) \
+	examples/cmdline.c
+
 tests_multiboot2_print1_SOURCES = \
 	$(libkernaux_a_SOURCES) \
 	tests/multiboot2_print1.c

examples/cmdline.c

@@ -0,0 +1,37 @@
+#include <kernaux/cmdline.h>
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+static const unsigned int ARGV_COUNT_MAX = 100;
+static const unsigned int ARG_SIZE_MAX = 4096;
+
+static const char *const cmdline = "foo bar\\ car";
+
+int main()
+{
+    char error_msg[KERNAUX_CMDLINE_ERROR_MSG_SIZE_MAX];
+    unsigned int argc;
+    char *argv[ARGV_COUNT_MAX];
+    char buffer[ARGV_COUNT_MAX * ARG_SIZE_MAX];
+
+    assert(kernaux_cmdline_parse(
+        cmdline,
+        error_msg,
+        &argc,
+        argv,
+        buffer,
+        ARGV_COUNT_MAX,
+        ARG_SIZE_MAX
+    ));
+
+    assert(strcmp(error_msg, "") == 0);
+    assert(argc == 2);
+    assert(strcmp(argv[0], "foo") == 0);
+    assert(strcmp(argv[1], "bar car") == 0);
+
+    printf("OK!\n");
+
+    return 0;
+}