Add tests for re-entrant functions

Created fgets_r_test.c, which verifies initialization of state, custom
buffer handling with auplugin_setvbuf_r, and EOF detection.

Author: stevegrubb

auplugin/test/Makefile.am

@@ -22,7 +22,7 @@
 
 AM_CPPFLAGS = -I${top_srcdir}/auplugin -I${top_srcdir}/lib -I${top_srcdir}/auparse
 AM_CFLAGS = -D_GNU_SOURCE -Wno-pointer-sign ${WFLAGS}
-check_PROGRAMS = fgets_test metrics_test
+check_PROGRAMS = fgets_test metrics_test fgets_r_test
 TESTS = $(check_PROGRAMS)
 
 fgets_test_LDADD = ${top_builddir}/auplugin/libauplugin.la
@@ -31,3 +31,6 @@ fgets_test_DEPENDENCIES = ${top_builddir}/auplugin/libauplugin.la
 metrics_test_LDADD = ${top_builddir}/auplugin/libauplugin.la
 metrics_test_DEPENDENCIES = ${top_builddir}/auplugin/libauplugin.la
 
+fgets_r_test_LDADD = ${top_builddir}/auplugin/libauplugin.la
+fgets_r_test_DEPENDENCIES = ${top_builddir}/auplugin/libauplugin.la
+

auplugin/test/fgets_r_test.c

@@ -0,0 +1,50 @@
+#include <assert.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <auplugin.h>
+
+static void test_basic_state(void)
+{
+	int fds[2];
+	char buf[16];
+	char custom[32];
+	auplugin_fgets_state_t *st;
+
+	assert(pipe(fds) == 0);
+
+	st = auplugin_fgets_init();
+	assert(st);
+	assert(auplugin_setvbuf_r(st, custom, sizeof(custom), MEM_SELF_MANAGED) == 0);
+
+	/* no data yet */
+	assert(auplugin_fgets_more_r(st, sizeof(buf)) == 0);
+	assert(auplugin_fgets_eof_r(st) == 0);
+
+	const char *input = "hi\n";
+	assert(write(fds[1], input, strlen(input)));
+	close(fds[1]);
+
+	/* read the line */
+	int len = auplugin_fgets_r(st, buf, sizeof(buf), fds[0]);
+	assert(len == 3);
+	assert(strcmp(buf, "hi\n") == 0);
+
+	/* EOF on next call */
+	len = auplugin_fgets_r(st, buf, sizeof(buf), fds[0]);
+	assert(len == 0);
+	assert(auplugin_fgets_eof_r(st) == 1);
+
+	auplugin_fgets_clear_r(st);
+	close(fds[0]);
+	auplugin_fgets_destroy(st);
+}
+
+int main(void)
+{
+	test_basic_state();
+	printf("audit-fgets_r tests: all passed\n");
+	return 0;
+}
+