src/message_test.c

/* vi:set ts=8 sts=4 sw=4 noet:
 *
 * VIM - Vi IMproved	by Bram Moolenaar
 *
 * Do ":help uganda"  in Vim to read copying and usage conditions.
 * Do ":help credits" in Vim to see a list of people who contributed.
 * See README.txt for an overview of the Vim source code.
 */

/*
 * message_test.c: Unittests for message.c
 */

#undef NDEBUG
#include <assert.h>

// Must include main.c because it contains much more than just main()
#define NO_VIM_MAIN
#include "main.c"

// This file has to be included because some of the tested functions are
// static.
#include "message.c"

#ifndef MIN
# define MIN(x,y) ((x) < (y) ? (x) : (y))
#endif

// These formats are not standard in C printf() function.
// Use a global variable rather than a literal format to disable
// -Wformat compiler warnings:
//
// - warning: '0' flag used with ‘%p’ gnu_printf format
// - warning: format ‘%S’ expects argument of type ‘wchar_t *’, but argument 4 has type ‘char *’
// - warning: unknown conversion type character ‘b’ in format
//
// These formats are in practise only used from vim script printf()
// function and never as literals in C code.
char *fmt_012p = "%012p";
char *fmt_5S   = "%5S";
char *fmt_06b  = "%06b";

/*
 * Test trunc_string().
 */
    static void
test_trunc_string(void)
{
    char_u  *buf; /*allocated every time to find uninit errors */
    char_u  *s;

    // in place
    buf = alloc(40);
    STRCPY(buf, "text");
    trunc_string(buf, buf, 20, 40);
    assert(STRCMP(buf, "text") == 0);
    vim_free(buf);

    buf = alloc(40);
    STRCPY(buf, "a short text");
    trunc_string(buf, buf, 20, 40);
    assert(STRCMP(buf, "a short text") == 0);
    vim_free(buf);

    buf = alloc(40);
    STRCPY(buf, "a text tha just fits");
    trunc_string(buf, buf, 20, 40);
    assert(STRCMP(buf, "a text tha just fits") == 0);
    vim_free(buf);

    buf = alloc(40);
    STRCPY(buf, "a text that nott fits");
    trunc_string(buf, buf, 20, 40);
    assert(STRCMP(buf, "a text t...nott fits") == 0);
    vim_free(buf);

    // copy from string to buf
    buf = alloc(40);
    s = vim_strsave((char_u *)"text");
    trunc_string(s, buf, 20, 40);
    assert(STRCMP(buf, "text") == 0);
    vim_free(buf);
    vim_free(s);

    buf = alloc(40);
    s = vim_strsave((char_u *)"a text that fits");
    trunc_string(s, buf, 34, 40);
    assert(STRCMP(buf, "a text that fits") == 0);
    vim_free(buf);
    vim_free(s);

    buf = alloc(40);
    s = vim_strsave((char_u *)"a short text");
    trunc_string(s, buf, 20, 40);
    assert(STRCMP(buf, "a short text") == 0);
    vim_free(buf);
    vim_free(s);

    buf = alloc(40);
    s = vim_strsave((char_u *)"a text tha just fits");
    trunc_string(s, buf, 20, 40);
    assert(STRCMP(buf, "a text tha just fits") == 0);
    vim_free(buf);
    vim_free(s);

    buf = alloc(40);
    s = vim_strsave((char_u *)"a text that nott fits");
    trunc_string(s, buf, 20, 40);
    assert(STRCMP(buf, "a text t...nott fits") == 0);
    vim_free(buf);
    vim_free(s);
}

/*
 * Test vim_snprintf() with a focus on checking that truncation is
 * correct when buffer is small, since it cannot be tested from
 * vim scrip tests. Check that:
 * - no buffer overflows happens (with valgrind or asan)
 * - output string is always NUL terminated.
 *
 * Not all formats of vim_snprintf() are checked here. They are
 * checked more exhaustively in Test_printf*() vim script tests.
 */
    static void
test_vim_snprintf(void)
{
    int		n;
    size_t	bsize;
    int		bsize_int;
    char	*ptr = (char *)0x87654321;

    // Loop on various buffer sizes to make sure that truncation of
    // vim_snprintf() is correct.
    for (bsize = 0; bsize < 15; ++bsize)
    {
	bsize_int = (int)bsize - 1;

	// buf is the heap rather than in the stack
	// so valgrind can detect buffer overflows if any.
	// Use malloc() rather than alloc() as test checks with 0-size
	// buffer and its content should then never be used.
	char *buf = malloc(bsize);

	n = vim_snprintf(buf, bsize, "%d", 1234567);
	assert(n == 7);
	assert(bsize == 0 || STRNCMP(buf, "1234567", bsize_int) == 0);
	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');

	n = vim_snprintf(buf, bsize, "%ld", 1234567L);
	assert(n == 7);
	assert(bsize == 0 || STRNCMP(buf, "1234567", bsize_int) == 0);
	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');

	n = vim_snprintf(buf, bsize, "%9ld", 1234567L);
	assert(n == 9);
	assert(bsize == 0 || STRNCMP(buf, "  1234567", bsize_int) == 0);
	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');

	n = vim_snprintf(buf, bsize, "%-9ld", 1234567L);
	assert(n == 9);
	assert(bsize == 0 || STRNCMP(buf, "1234567  ", bsize_int) == 0);
	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');

	n = vim_snprintf(buf, bsize, "%x", 0xdeadbeef);
	assert(n == 8);
	assert(bsize == 0 || STRNCMP(buf, "deadbeef", bsize_int) == 0);
	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');

	n = vim_snprintf(buf, bsize, fmt_06b, 12);
	assert(n == 6);
	assert(bsize == 0 || STRNCMP(buf, "001100", bsize_int) == 0);
	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');

#ifdef FEAT_FLOAT
	n = vim_snprintf(buf, bsize, "%f", 1.234);
	assert(n == 8);
	assert(bsize == 0 || STRNCMP(buf, "1.234000", bsize_int) == 0);
	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');

	n = vim_snprintf(buf, bsize, "%e", 1.234);
	assert(n == 12);
	assert(bsize == 0 || STRNCMP(buf, "1.234000e+00", bsize_int) == 0);
	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');

	n = vim_snprintf(buf, bsize, "%f", 0.0/0.0);
	assert(n == 3);
	assert(bsize == 0 || STRNCMP(buf, "nan", bsize_int) == 0);
	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');

	n = vim_snprintf(buf, bsize, "%f", 1.0/0.0);
	assert(n == 3);
	assert(bsize == 0 || STRNCMP(buf, "inf", bsize_int) == 0);
	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');

	n = vim_snprintf(buf, bsize, "%f", -1.0/0.0);
	assert(n == 4);
	assert(bsize == 0 || STRNCMP(buf, "-inf", bsize_int) == 0);
	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');

	n = vim_snprintf(buf, bsize, "%f", -0.0);
	assert(n == 9);
	assert(bsize == 0 || STRNCMP(buf, "-0.000000", bsize_int) == 0);
	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');
#endif

	n = vim_snprintf(buf, bsize, "%s", "漢語");
	assert(n == 6);
	assert(bsize == 0 || STRNCMP(buf, "漢語", bsize_int) == 0);
	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');

	n = vim_snprintf(buf, bsize, "%8s", "漢語");
	assert(n == 8);
	assert(bsize == 0 || STRNCMP(buf, "  漢語", bsize_int) == 0);
	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');

	n = vim_snprintf(buf, bsize, "%-8s", "漢語");
	assert(n == 8);
	assert(bsize == 0 || STRNCMP(buf, "漢語  ", bsize_int) == 0);
	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');

	n = vim_snprintf(buf, bsize, "%.3s", "漢語");
	assert(n == 3);
	assert(bsize == 0 || STRNCMP(buf, "漢", bsize_int) == 0);
	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');

	n = vim_snprintf(buf, bsize, fmt_5S, "foo");
	assert(n == 5);
	assert(bsize == 0 || STRNCMP(buf, "  foo", bsize_int) == 0);
	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');

	n = vim_snprintf(buf, bsize, "%%%%%%");
	assert(n == 3);
	assert(bsize == 0 || STRNCMP(buf, "%%%", bsize_int) == 0);
	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');

	n = vim_snprintf(buf, bsize, "%c%c", 1, 2);
	assert(n == 2);
	assert(bsize == 0 || STRNCMP(buf, "\x01\x02", bsize_int) == 0);
	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');

	// %p format is not tested in vim script tests Test_printf*()
	// as it only makes sense in C code.
	n = vim_snprintf(buf, bsize, "%p", ptr);
	assert(n == 10);
	assert(bsize == 0 || STRNCMP(buf, "0x87654321", bsize_int) == 0);
	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');

	n = vim_snprintf(buf, bsize, fmt_012p, ptr);
	assert(n == 12);
	assert(bsize == 0 || STRNCMP(buf, "0x0087654321", bsize_int) == 0);
	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');

	free(buf);
    }
}

    int
main(int argc, char **argv)
{
    vim_memset(&params, 0, sizeof(params));
    params.argc = argc;
    params.argv = argv;
    common_init(&params);

    set_option_value((char_u *)"encoding", 0, (char_u *)"utf-8", 0);
    init_chartab();
    test_trunc_string();
    test_vim_snprintf();

    set_option_value((char_u *)"encoding", 0, (char_u *)"latin1", 0);
    init_chartab();
    test_trunc_string();
    test_vim_snprintf();

    return 0;
}