tests/test_printbuf.c

#include <assert.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>

#include "debug.h"
#include "printbuf.h"

static void test_basic_printbuf_memset(void);
static void test_printbuf_memset_length(void);

static void test_basic_printbuf_memset()
{
	struct printbuf *pb;

	printf("%s: starting test\n", __func__);
	pb = printbuf_new();
	sprintbuf(pb, "blue:%d", 1);
	printbuf_memset(pb, -1, 'x', 52);
	printf("Buffer contents:%.*s\n", printbuf_length(pb), pb->buf);
	printbuf_free(pb);
	printf("%s: end test\n", __func__);
}

static void test_printbuf_memset_length()
{
	struct printbuf *pb;

	printf("%s: starting test\n", __func__);
	pb = printbuf_new();
	printbuf_memset(pb, -1, ' ', 0);
	printbuf_memset(pb, -1, ' ', 0);
	printbuf_memset(pb, -1, ' ', 0);
	printbuf_memset(pb, -1, ' ', 0);
	printbuf_memset(pb, -1, ' ', 0);
	printf("Buffer length: %d\n", printbuf_length(pb));
	printbuf_memset(pb, -1, ' ', 2);
	printbuf_memset(pb, -1, ' ', 4);
	printbuf_memset(pb, -1, ' ', 6);
	printf("Buffer length: %d\n", printbuf_length(pb));
	printbuf_memset(pb, -1, ' ', 6);
	printf("Buffer length: %d\n", printbuf_length(pb));
	printbuf_memset(pb, -1, ' ', 8);
	printbuf_memset(pb, -1, ' ', 10);
	printbuf_memset(pb, -1, ' ', 10);
	printbuf_memset(pb, -1, ' ', 10);
	printbuf_memset(pb, -1, ' ', 20);
	printf("Buffer length: %d\n", printbuf_length(pb));

	// No length change should occur
	printbuf_memset(pb, 0, 'x', 30);
	printf("Buffer length: %d\n", printbuf_length(pb));

	// This should extend it by one.
	printbuf_memset(pb, 0, 'x', printbuf_length(pb) + 1);
	printf("Buffer length: %d\n", printbuf_length(pb));

	printbuf_free(pb);
	printf("%s: end test\n", __func__);
}

static void test_printbuf_memappend(int *before_resize);
static void test_printbuf_memappend(int *before_resize)
{
	struct printbuf *pb;
	int initial_size;

	printf("%s: starting test\n", __func__);
	pb = printbuf_new();
	printf("Buffer length: %d\n", printbuf_length(pb));

	initial_size = pb->size;

	while(pb->size == initial_size)
	{
		printbuf_memappend_fast(pb, "x", 1);
	}
	*before_resize = printbuf_length(pb) - 1;
	printf("Appended %d bytes for resize: [%s]\n", *before_resize + 1, pb->buf);

	printbuf_reset(pb);
	printbuf_memappend_fast(pb, "bluexyz123", 3);
	printf("Partial append: %d, [%s]\n", printbuf_length(pb), pb->buf);

	char with_nulls[] = { 'a', 'b', '\0', 'c' };
	printbuf_reset(pb);
	printbuf_memappend_fast(pb, with_nulls, sizeof(with_nulls));
	printf("With embedded \\0 character: %d, [%s]\n", printbuf_length(pb), pb->buf);

	printbuf_free(pb);
	pb = printbuf_new();
	char *data = malloc(*before_resize);
	memset(data, 'X', *before_resize);
	printbuf_memappend_fast(pb, data, *before_resize);
	printf("Append to just before resize: %d, [%s]\n", printbuf_length(pb), pb->buf);

	free(data);
	printbuf_free(pb);

	pb = printbuf_new();
	data = malloc(*before_resize + 1);
	memset(data, 'X', *before_resize + 1);
	printbuf_memappend_fast(pb, data, *before_resize + 1);
	printf("Append to just after resize: %d, [%s]\n", printbuf_length(pb), pb->buf);

	free(data);

	printbuf_free(pb);
	printf("%s: end test\n", __func__);
}

static void test_sprintbuf(int before_resize);
static void test_sprintbuf(int before_resize)
{
	struct printbuf *pb;

	printf("%s: starting test\n", __func__);
	pb = printbuf_new();
	printf("Buffer length: %d\n", printbuf_length(pb));

	char *data = malloc(before_resize + 1 + 1);
	memset(data, 'X', before_resize + 1 + 1);
	data[before_resize + 1] = '\0';
	sprintbuf(pb, "%s", data);
	free(data);
	printf("sprintbuf to just after resize(%d+1): %d, [%s], strlen(buf)=%d\n", before_resize, printbuf_length(pb), pb->buf, (int)strlen(pb->buf));

	printbuf_reset(pb);
	sprintbuf(pb, "plain");
	printf("%d, [%s]\n", printbuf_length(pb), pb->buf);

	sprintbuf(pb, "%d", 1);
	printf("%d, [%s]\n", printbuf_length(pb), pb->buf);

	sprintbuf(pb, "%d", INT_MAX);
	printf("%d, [%s]\n", printbuf_length(pb), pb->buf);

	sprintbuf(pb, "%d", INT_MIN);
	printf("%d, [%s]\n", printbuf_length(pb), pb->buf);

	sprintbuf(pb, "%s", "%s");
	printf("%d, [%s]\n", printbuf_length(pb), pb->buf);

	printbuf_free(pb);
	printf("%s: end test\n", __func__);
}

int main(int argc, char **argv)
{
	int before_resize = 0;

	mc_set_debug(1);

	test_basic_printbuf_memset();
	printf("========================================\n");
	test_printbuf_memset_length();
	printf("========================================\n");
	test_printbuf_memappend(&before_resize);
	printf("========================================\n");
	test_sprintbuf(before_resize);
	printf("========================================\n");

	return 0;
}