New upstream version 1.3.0+dfsg.1

[libgit2.git] / tests / core / buffer.c

#include "clar_libgit2.h"
#include "buffer.h"
#include "git2/sys/hashsig.h"
#include "futils.h"

#define TESTSTR "Have you seen that? Have you seeeen that??"
const char *test_string = TESTSTR;
const char *test_string_x2 = TESTSTR TESTSTR;

#define TESTSTR_4096 REP1024("1234")
#define TESTSTR_8192 REP1024("12341234")
const char *test_4096 = TESTSTR_4096;
const char *test_8192 = TESTSTR_8192;

/* test basic data concatenation */
void test_core_buffer__0(void)
{
        git_buf buf = GIT_BUF_INIT;

        cl_assert(buf.size == 0);

        git_buf_puts(&buf, test_string);
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s(test_string, git_buf_cstr(&buf));

        git_buf_puts(&buf, test_string);
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s(test_string_x2, git_buf_cstr(&buf));

        git_buf_dispose(&buf);
}

/* test git_buf_printf */
void test_core_buffer__1(void)
{
        git_buf buf = GIT_BUF_INIT;

        git_buf_printf(&buf, "%s %s %d ", "shoop", "da", 23);
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s("shoop da 23 ", git_buf_cstr(&buf));

        git_buf_printf(&buf, "%s %d", "woop", 42);
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s("shoop da 23 woop 42", git_buf_cstr(&buf));

        git_buf_dispose(&buf);
}

/* more thorough test of concatenation options */
void test_core_buffer__2(void)
{
        git_buf buf = GIT_BUF_INIT;
        int i;
        char data[128];

        cl_assert(buf.size == 0);

        /* this must be safe to do */
        git_buf_dispose(&buf);
        cl_assert(buf.size == 0);
        cl_assert(buf.asize == 0);

        /* empty buffer should be empty string */
        cl_assert_equal_s("", git_buf_cstr(&buf));
        cl_assert(buf.size == 0);
        /* cl_assert(buf.asize == 0); -- should not assume what git_buf does */

        /* free should set us back to the beginning */
        git_buf_dispose(&buf);
        cl_assert(buf.size == 0);
        cl_assert(buf.asize == 0);

        /* add letter */
        git_buf_putc(&buf, '+');
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s("+", git_buf_cstr(&buf));

        /* add letter again */
        git_buf_putc(&buf, '+');
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s("++", git_buf_cstr(&buf));

        /* let's try that a few times */
        for (i = 0; i < 16; ++i) {
                git_buf_putc(&buf, '+');
                cl_assert(git_buf_oom(&buf) == 0);
        }
        cl_assert_equal_s("++++++++++++++++++", git_buf_cstr(&buf));

        git_buf_dispose(&buf);

        /* add data */
        git_buf_put(&buf, "xo", 2);
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s("xo", git_buf_cstr(&buf));

        /* add letter again */
        git_buf_put(&buf, "xo", 2);
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s("xoxo", git_buf_cstr(&buf));

        /* let's try that a few times */
        for (i = 0; i < 16; ++i) {
                git_buf_put(&buf, "xo", 2);
                cl_assert(git_buf_oom(&buf) == 0);
        }
        cl_assert_equal_s("xoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxo",
                                           git_buf_cstr(&buf));

        git_buf_dispose(&buf);

        /* set to string */
        git_buf_sets(&buf, test_string);
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s(test_string, git_buf_cstr(&buf));

        /* append string */
        git_buf_puts(&buf, test_string);
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s(test_string_x2, git_buf_cstr(&buf));

        /* set to string again (should overwrite - not append) */
        git_buf_sets(&buf, test_string);
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s(test_string, git_buf_cstr(&buf));

        /* test clear */
        git_buf_clear(&buf);
        cl_assert_equal_s("", git_buf_cstr(&buf));

        git_buf_dispose(&buf);

        /* test extracting data into buffer */
        git_buf_puts(&buf, REP4("0123456789"));
        cl_assert(git_buf_oom(&buf) == 0);

        git_buf_copy_cstr(data, sizeof(data), &buf);
        cl_assert_equal_s(REP4("0123456789"), data);
        git_buf_copy_cstr(data, 11, &buf);
        cl_assert_equal_s("0123456789", data);
        git_buf_copy_cstr(data, 3, &buf);
        cl_assert_equal_s("01", data);
        git_buf_copy_cstr(data, 1, &buf);
        cl_assert_equal_s("", data);

        git_buf_copy_cstr(data, sizeof(data), &buf);
        cl_assert_equal_s(REP4("0123456789"), data);

        git_buf_sets(&buf, REP256("x"));
        git_buf_copy_cstr(data, sizeof(data), &buf);
        /* since sizeof(data) == 128, only 127 bytes should be copied */
        cl_assert_equal_s(REP4(REP16("x")) REP16("x") REP16("x")
                                           REP16("x") "xxxxxxxxxxxxxxx", data);

        git_buf_dispose(&buf);

        git_buf_copy_cstr(data, sizeof(data), &buf);
        cl_assert_equal_s("", data);
}

/* let's do some tests with larger buffers to push our limits */
void test_core_buffer__3(void)
{
        git_buf buf = GIT_BUF_INIT;

        /* set to string */
        git_buf_set(&buf, test_4096, 4096);
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s(test_4096, git_buf_cstr(&buf));

        /* append string */
        git_buf_puts(&buf, test_4096);
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s(test_8192, git_buf_cstr(&buf));

        /* set to string again (should overwrite - not append) */
        git_buf_set(&buf, test_4096, 4096);
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s(test_4096, git_buf_cstr(&buf));

        git_buf_dispose(&buf);
}

/* let's try some producer/consumer tests */
void test_core_buffer__4(void)
{
        git_buf buf = GIT_BUF_INIT;
        int i;

        for (i = 0; i < 10; ++i) {
                git_buf_puts(&buf, "1234"); /* add 4 */
                cl_assert(git_buf_oom(&buf) == 0);
                git_buf_consume(&buf, buf.ptr + 2); /* eat the first two */
                cl_assert(strlen(git_buf_cstr(&buf)) == (size_t)((i + 1) * 2));
        }
        /* we have appended 1234 10x and removed the first 20 letters */
        cl_assert_equal_s("12341234123412341234", git_buf_cstr(&buf));

        git_buf_consume(&buf, NULL);
        cl_assert_equal_s("12341234123412341234", git_buf_cstr(&buf));

        git_buf_consume(&buf, "invalid pointer");
        cl_assert_equal_s("12341234123412341234", git_buf_cstr(&buf));

        git_buf_consume(&buf, buf.ptr);
        cl_assert_equal_s("12341234123412341234", git_buf_cstr(&buf));

        git_buf_consume(&buf, buf.ptr + 1);
        cl_assert_equal_s("2341234123412341234", git_buf_cstr(&buf));

        git_buf_consume(&buf, buf.ptr + buf.size);
        cl_assert_equal_s("", git_buf_cstr(&buf));

        git_buf_dispose(&buf);
}


static void
check_buf_append(
        const char* data_a,
        const char* data_b,
        const char* expected_data,
        size_t expected_size,
        size_t expected_asize)
{
        git_buf tgt = GIT_BUF_INIT;

        git_buf_sets(&tgt, data_a);
        cl_assert(git_buf_oom(&tgt) == 0);
        git_buf_puts(&tgt, data_b);
        cl_assert(git_buf_oom(&tgt) == 0);
        cl_assert_equal_s(expected_data, git_buf_cstr(&tgt));
        cl_assert_equal_i(tgt.size, expected_size);
        if (expected_asize > 0)
                cl_assert_equal_i(tgt.asize, expected_asize);

        git_buf_dispose(&tgt);
}

static void
check_buf_append_abc(
        const char* buf_a,
        const char* buf_b,
        const char* buf_c,
        const char* expected_ab,
        const char* expected_abc,
        const char* expected_abca,
        const char* expected_abcab,
        const char* expected_abcabc)
{
        git_buf buf = GIT_BUF_INIT;

        git_buf_sets(&buf, buf_a);
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s(buf_a, git_buf_cstr(&buf));

        git_buf_puts(&buf, buf_b);
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s(expected_ab, git_buf_cstr(&buf));

        git_buf_puts(&buf, buf_c);
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s(expected_abc, git_buf_cstr(&buf));

        git_buf_puts(&buf, buf_a);
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s(expected_abca, git_buf_cstr(&buf));

        git_buf_puts(&buf, buf_b);
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s(expected_abcab, git_buf_cstr(&buf));

        git_buf_puts(&buf, buf_c);
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s(expected_abcabc, git_buf_cstr(&buf));

        git_buf_dispose(&buf);
}

/* more variations on append tests */
void test_core_buffer__5(void)
{
        check_buf_append("", "", "", 0, 0);
        check_buf_append("a", "", "a", 1, 0);
        check_buf_append("", "a", "a", 1, 8);
        check_buf_append("", "a", "a", 1, 8);
        check_buf_append("a", "b", "ab", 2, 8);
        check_buf_append("", "abcdefgh", "abcdefgh", 8, 16);
        check_buf_append("abcdefgh", "", "abcdefgh", 8, 16);

        /* buffer with starting asize will grow to:
         *  1 ->  2,  2 ->  3,  3 ->  5,  4 ->  6,  5 ->  8,  6 ->  9,
         *  7 -> 11,  8 -> 12,  9 -> 14, 10 -> 15, 11 -> 17, 12 -> 18,
         * 13 -> 20, 14 -> 21, 15 -> 23, 16 -> 24, 17 -> 26, 18 -> 27,
         * 19 -> 29, 20 -> 30, 21 -> 32, 22 -> 33, 23 -> 35, 24 -> 36,
         * ...
         * follow sequence until value > target size,
         * then round up to nearest multiple of 8.
         */

        check_buf_append("abcdefgh", "/", "abcdefgh/", 9, 16);
        check_buf_append("abcdefgh", "ijklmno", "abcdefghijklmno", 15, 16);
        check_buf_append("abcdefgh", "ijklmnop", "abcdefghijklmnop", 16, 24);
        check_buf_append("0123456789", "0123456789",
                                         "01234567890123456789", 20, 24);
        check_buf_append(REP16("x"), REP16("o"),
                                         REP16("x") REP16("o"), 32, 40);

        check_buf_append(test_4096, "", test_4096, 4096, 4104);
        check_buf_append(test_4096, test_4096, test_8192, 8192, 8200);

        /* check sequences of appends */
        check_buf_append_abc("a", "b", "c",
                                                 "ab", "abc", "abca", "abcab", "abcabc");
        check_buf_append_abc("a1", "b2", "c3",
                                                 "a1b2", "a1b2c3", "a1b2c3a1",
                                                 "a1b2c3a1b2", "a1b2c3a1b2c3");
        check_buf_append_abc("a1/", "b2/", "c3/",
                                                 "a1/b2/", "a1/b2/c3/", "a1/b2/c3/a1/",
                                                 "a1/b2/c3/a1/b2/", "a1/b2/c3/a1/b2/c3/");
}

/* test swap */
void test_core_buffer__6(void)
{
        git_buf a = GIT_BUF_INIT;
        git_buf b = GIT_BUF_INIT;

        git_buf_sets(&a, "foo");
        cl_assert(git_buf_oom(&a) == 0);
        git_buf_sets(&b, "bar");
        cl_assert(git_buf_oom(&b) == 0);

        cl_assert_equal_s("foo", git_buf_cstr(&a));
        cl_assert_equal_s("bar", git_buf_cstr(&b));

        git_buf_swap(&a, &b);

        cl_assert_equal_s("bar", git_buf_cstr(&a));
        cl_assert_equal_s("foo", git_buf_cstr(&b));

        git_buf_dispose(&a);
        git_buf_dispose(&b);
}


/* test detach/attach data */
void test_core_buffer__7(void)
{
        const char *fun = "This is fun";
        git_buf a = GIT_BUF_INIT;
        char *b = NULL;

        git_buf_sets(&a, "foo");
        cl_assert(git_buf_oom(&a) == 0);
        cl_assert_equal_s("foo", git_buf_cstr(&a));

        b = git_buf_detach(&a);

        cl_assert_equal_s("foo", b);
        cl_assert_equal_s("", a.ptr);
        git__free(b);

        b = git_buf_detach(&a);

        cl_assert_equal_s(NULL, b);
        cl_assert_equal_s("", a.ptr);

        git_buf_dispose(&a);

        b = git__strdup(fun);
        git_buf_attach(&a, b, 0);

        cl_assert_equal_s(fun, a.ptr);
        cl_assert(a.size == strlen(fun));
        cl_assert(a.asize == strlen(fun) + 1);

        git_buf_dispose(&a);

        b = git__strdup(fun);
        git_buf_attach(&a, b, strlen(fun) + 1);

        cl_assert_equal_s(fun, a.ptr);
        cl_assert(a.size == strlen(fun));
        cl_assert(a.asize == strlen(fun) + 1);

        git_buf_dispose(&a);
}


static void
check_joinbuf_2(
        const char *a,
        const char *b,
        const char *expected)
{
        char sep = '/';
        git_buf buf = GIT_BUF_INIT;

        git_buf_join(&buf, sep, a, b);
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s(expected, git_buf_cstr(&buf));
        git_buf_dispose(&buf);
}

static void
check_joinbuf_overlapped(
        const char *oldval,
        int ofs_a,
        const char *b,
        const char *expected)
{
        char sep = '/';
        git_buf buf = GIT_BUF_INIT;

        git_buf_sets(&buf, oldval);
        git_buf_join(&buf, sep, buf.ptr + ofs_a, b);
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s(expected, git_buf_cstr(&buf));
        git_buf_dispose(&buf);
}

static void
check_joinbuf_n_2(
        const char *a,
        const char *b,
        const char *expected)
{
        char sep = '/';
        git_buf buf = GIT_BUF_INIT;

        git_buf_sets(&buf, a);
        cl_assert(git_buf_oom(&buf) == 0);

        git_buf_join_n(&buf, sep, 1, b);
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s(expected, git_buf_cstr(&buf));

        git_buf_dispose(&buf);
}

static void
check_joinbuf_n_4(
        const char *a,
        const char *b,
        const char *c,
        const char *d,
        const char *expected)
{
        char sep = ';';
        git_buf buf = GIT_BUF_INIT;
        git_buf_join_n(&buf, sep, 4, a, b, c, d);
        cl_assert(git_buf_oom(&buf) == 0);
        cl_assert_equal_s(expected, git_buf_cstr(&buf));
        git_buf_dispose(&buf);
}

/* test join */
void test_core_buffer__8(void)
{
        git_buf a = GIT_BUF_INIT;

        git_buf_join_n(&a, '/', 1, "foo");
        cl_assert(git_buf_oom(&a) == 0);
        cl_assert_equal_s("foo", git_buf_cstr(&a));

        git_buf_join_n(&a, '/', 1, "bar");
        cl_assert(git_buf_oom(&a) == 0);
        cl_assert_equal_s("foo/bar", git_buf_cstr(&a));

        git_buf_join_n(&a, '/', 1, "baz");
        cl_assert(git_buf_oom(&a) == 0);
        cl_assert_equal_s("foo/bar/baz", git_buf_cstr(&a));

        git_buf_dispose(&a);

        check_joinbuf_2(NULL, "", "");
        check_joinbuf_2(NULL, "a", "a");
        check_joinbuf_2(NULL, "/a", "/a");
        check_joinbuf_2("", "", "");
        check_joinbuf_2("", "a", "a");
        check_joinbuf_2("", "/a", "/a");
        check_joinbuf_2("a", "", "a/");
        check_joinbuf_2("a", "/", "a/");
        check_joinbuf_2("a", "b", "a/b");
        check_joinbuf_2("/", "a", "/a");
        check_joinbuf_2("/", "", "/");
        check_joinbuf_2("/a", "/b", "/a/b");
        check_joinbuf_2("/a", "/b/", "/a/b/");
        check_joinbuf_2("/a/", "b/", "/a/b/");
        check_joinbuf_2("/a/", "/b/", "/a/b/");
        check_joinbuf_2("/a/", "//b/", "/a/b/");
        check_joinbuf_2("/abcd", "/defg", "/abcd/defg");
        check_joinbuf_2("/abcd", "/defg/", "/abcd/defg/");
        check_joinbuf_2("/abcd/", "defg/", "/abcd/defg/");
        check_joinbuf_2("/abcd/", "/defg/", "/abcd/defg/");

        check_joinbuf_overlapped("abcd", 0, "efg", "abcd/efg");
        check_joinbuf_overlapped("abcd", 1, "efg", "bcd/efg");
        check_joinbuf_overlapped("abcd", 2, "efg", "cd/efg");
        check_joinbuf_overlapped("abcd", 3, "efg", "d/efg");
        check_joinbuf_overlapped("abcd", 4, "efg", "efg");
        check_joinbuf_overlapped("abc/", 2, "efg", "c/efg");
        check_joinbuf_overlapped("abc/", 3, "efg", "/efg");
        check_joinbuf_overlapped("abc/", 4, "efg", "efg");
        check_joinbuf_overlapped("abcd", 3, "", "d/");
        check_joinbuf_overlapped("abcd", 4, "", "");
        check_joinbuf_overlapped("abc/", 2, "", "c/");
        check_joinbuf_overlapped("abc/", 3, "", "/");
        check_joinbuf_overlapped("abc/", 4, "", "");

        check_joinbuf_n_2("", "", "");
        check_joinbuf_n_2("", "a", "a");
        check_joinbuf_n_2("", "/a", "/a");
        check_joinbuf_n_2("a", "", "a/");
        check_joinbuf_n_2("a", "/", "a/");
        check_joinbuf_n_2("a", "b", "a/b");
        check_joinbuf_n_2("/", "a", "/a");
        check_joinbuf_n_2("/", "", "/");
        check_joinbuf_n_2("/a", "/b", "/a/b");
        check_joinbuf_n_2("/a", "/b/", "/a/b/");
        check_joinbuf_n_2("/a/", "b/", "/a/b/");
        check_joinbuf_n_2("/a/", "/b/", "/a/b/");
        check_joinbuf_n_2("/abcd", "/defg", "/abcd/defg");
        check_joinbuf_n_2("/abcd", "/defg/", "/abcd/defg/");
        check_joinbuf_n_2("/abcd/", "defg/", "/abcd/defg/");
        check_joinbuf_n_2("/abcd/", "/defg/", "/abcd/defg/");

        check_joinbuf_n_4("", "", "", "", "");
        check_joinbuf_n_4("", "a", "", "", "a;");
        check_joinbuf_n_4("a", "", "", "", "a;");
        check_joinbuf_n_4("", "", "", "a", "a");
        check_joinbuf_n_4("a", "b", "", ";c;d;", "a;b;c;d;");
        check_joinbuf_n_4("a", "b", "", ";c;d", "a;b;c;d");
        check_joinbuf_n_4("abcd", "efgh", "ijkl", "mnop", "abcd;efgh;ijkl;mnop");
        check_joinbuf_n_4("abcd;", "efgh;", "ijkl;", "mnop;", "abcd;efgh;ijkl;mnop;");
        check_joinbuf_n_4(";abcd;", ";efgh;", ";ijkl;", ";mnop;", ";abcd;efgh;ijkl;mnop;");
}

void test_core_buffer__9(void)
{
        git_buf buf = GIT_BUF_INIT;

        /* just some exhaustive tests of various separator placement */
        char *a[] = { "", "-", "a-", "-a", "-a-" };
        char *b[] = { "", "-", "b-", "-b", "-b-" };
        char sep[] = { 0, '-', '/' };
        char *expect_null[] = { "",    "-",     "a-",     "-a",     "-a-",
                                                        "-",   "--",    "a--",    "-a-",    "-a--",
                                                        "b-",  "-b-",   "a-b-",   "-ab-",   "-a-b-",
                                                        "-b",  "--b",   "a--b",   "-a-b",   "-a--b",
                                                        "-b-", "--b-",  "a--b-",  "-a-b-",  "-a--b-" };
        char *expect_dash[] = { "",    "-",     "a-",     "-a-",    "-a-",
                                                        "-",   "-",     "a-",     "-a-",    "-a-",
                                                        "b-",  "-b-",   "a-b-",   "-a-b-",  "-a-b-",
                                                        "-b",  "-b",    "a-b",    "-a-b",   "-a-b",
                                                        "-b-", "-b-",   "a-b-",   "-a-b-",  "-a-b-" };
        char *expect_slas[] = { "",    "-/",    "a-/",    "-a/",    "-a-/",
                                                        "-",   "-/-",   "a-/-",   "-a/-",   "-a-/-",
                                                        "b-",  "-/b-",  "a-/b-",  "-a/b-",  "-a-/b-",
                                                        "-b",  "-/-b",  "a-/-b",  "-a/-b",  "-a-/-b",
                                                        "-b-", "-/-b-", "a-/-b-", "-a/-b-", "-a-/-b-" };
        char **expect_values[] = { expect_null, expect_dash, expect_slas };
        char separator, **expect;
        unsigned int s, i, j;

        for (s = 0; s < sizeof(sep) / sizeof(char); ++s) {
                separator = sep[s];
                expect = expect_values[s];

                for (j = 0; j < sizeof(b) / sizeof(char*); ++j) {
                        for (i = 0; i < sizeof(a) / sizeof(char*); ++i) {
                                git_buf_join(&buf, separator, a[i], b[j]);
                                cl_assert_equal_s(*expect, buf.ptr);
                                expect++;
                        }
                }
        }

        git_buf_dispose(&buf);
}

void test_core_buffer__10(void)
{
        git_buf a = GIT_BUF_INIT;

        cl_git_pass(git_buf_join_n(&a, '/', 1, "test"));
        cl_assert_equal_s(a.ptr, "test");
        cl_git_pass(git_buf_join_n(&a, '/', 1, "string"));
        cl_assert_equal_s(a.ptr, "test/string");
        git_buf_clear(&a);
        cl_git_pass(git_buf_join_n(&a, '/', 3, "test", "string", "join"));
        cl_assert_equal_s(a.ptr, "test/string/join");
        cl_git_pass(git_buf_join_n(&a, '/', 2, a.ptr, "more"));
        cl_assert_equal_s(a.ptr, "test/string/join/test/string/join/more");

        git_buf_dispose(&a);
}

void test_core_buffer__join3(void)
{
        git_buf a = GIT_BUF_INIT;

        cl_git_pass(git_buf_join3(&a, '/', "test", "string", "join"));
        cl_assert_equal_s("test/string/join", a.ptr);
        cl_git_pass(git_buf_join3(&a, '/', "test/", "string", "join"));
        cl_assert_equal_s("test/string/join", a.ptr);
        cl_git_pass(git_buf_join3(&a, '/', "test/", "/string", "join"));
        cl_assert_equal_s("test/string/join", a.ptr);
        cl_git_pass(git_buf_join3(&a, '/', "test/", "/string/", "join"));
        cl_assert_equal_s("test/string/join", a.ptr);
        cl_git_pass(git_buf_join3(&a, '/', "test/", "/string/", "/join"));
        cl_assert_equal_s("test/string/join", a.ptr);

        cl_git_pass(git_buf_join3(&a, '/', "", "string", "join"));
        cl_assert_equal_s("string/join", a.ptr);
        cl_git_pass(git_buf_join3(&a, '/', "", "string/", "join"));
        cl_assert_equal_s("string/join", a.ptr);
        cl_git_pass(git_buf_join3(&a, '/', "", "string/", "/join"));
        cl_assert_equal_s("string/join", a.ptr);

        cl_git_pass(git_buf_join3(&a, '/', "string", "", "join"));
        cl_assert_equal_s("string/join", a.ptr);
        cl_git_pass(git_buf_join3(&a, '/', "string/", "", "join"));
        cl_assert_equal_s("string/join", a.ptr);
        cl_git_pass(git_buf_join3(&a, '/', "string/", "", "/join"));
        cl_assert_equal_s("string/join", a.ptr);

        git_buf_dispose(&a);
}

void test_core_buffer__11(void)
{
        git_buf a = GIT_BUF_INIT;
        char *t1[] = { "nothing", "in", "common" };
        char *t2[] = { "something", "something else", "some other" };
        char *t3[] = { "something", "some fun", "no fun" };
        char *t4[] = { "happy", "happier", "happiest" };
        char *t5[] = { "happiest", "happier", "happy" };
        char *t6[] = { "no", "nope", "" };
        char *t7[] = { "", "doesn't matter" };

        cl_git_pass(git_buf_common_prefix(&a, t1, 3));
        cl_assert_equal_s(a.ptr, "");

        cl_git_pass(git_buf_common_prefix(&a, t2, 3));
        cl_assert_equal_s(a.ptr, "some");

        cl_git_pass(git_buf_common_prefix(&a, t3, 3));
        cl_assert_equal_s(a.ptr, "");

        cl_git_pass(git_buf_common_prefix(&a, t4, 3));
        cl_assert_equal_s(a.ptr, "happ");

        cl_git_pass(git_buf_common_prefix(&a, t5, 3));
        cl_assert_equal_s(a.ptr, "happ");

        cl_git_pass(git_buf_common_prefix(&a, t6, 3));
        cl_assert_equal_s(a.ptr, "");

        cl_git_pass(git_buf_common_prefix(&a, t7, 3));
        cl_assert_equal_s(a.ptr, "");

        git_buf_dispose(&a);
}

void test_core_buffer__rfind_variants(void)
{
        git_buf a = GIT_BUF_INIT;
        ssize_t len;

        cl_git_pass(git_buf_sets(&a, "/this/is/it/"));

        len = (ssize_t)git_buf_len(&a);

        cl_assert(git_buf_rfind(&a, '/') == len - 1);
        cl_assert(git_buf_rfind_next(&a, '/') == len - 4);

        cl_assert(git_buf_rfind(&a, 'i') == len - 3);
        cl_assert(git_buf_rfind_next(&a, 'i') == len - 3);

        cl_assert(git_buf_rfind(&a, 'h') == 2);
        cl_assert(git_buf_rfind_next(&a, 'h') == 2);

        cl_assert(git_buf_rfind(&a, 'q') == -1);
        cl_assert(git_buf_rfind_next(&a, 'q') == -1);

        git_buf_dispose(&a);
}

void test_core_buffer__puts_escaped(void)
{
        git_buf a = GIT_BUF_INIT;

        git_buf_clear(&a);
        cl_git_pass(git_buf_puts_escaped(&a, "this is a test", "", ""));
        cl_assert_equal_s("this is a test", a.ptr);

        git_buf_clear(&a);
        cl_git_pass(git_buf_puts_escaped(&a, "this is a test", "t", "\\"));
        cl_assert_equal_s("\\this is a \\tes\\t", a.ptr);

        git_buf_clear(&a);
        cl_git_pass(git_buf_puts_escaped(&a, "this is a test", "i ", "__"));
        cl_assert_equal_s("th__is__ __is__ a__ test", a.ptr);

        git_buf_clear(&a);
        cl_git_pass(git_buf_puts_escape_regex(&a, "^match\\s*[A-Z]+.*"));
        cl_assert_equal_s("\\^match\\\\s\\*\\[A-Z\\]\\+\\.\\*", a.ptr);

        git_buf_dispose(&a);
}

static void assert_unescape(char *expected, char *to_unescape) {
        git_buf buf = GIT_BUF_INIT;

        cl_git_pass(git_buf_sets(&buf, to_unescape));
        git_buf_unescape(&buf);
        cl_assert_equal_s(expected, buf.ptr);
        cl_assert_equal_sz(strlen(expected), buf.size);

        git_buf_dispose(&buf);
}

void test_core_buffer__unescape(void)
{
        assert_unescape("Escaped\\", "Es\\ca\\ped\\");
        assert_unescape("Es\\caped\\", "Es\\\\ca\\ped\\\\");
        assert_unescape("\\", "\\");
        assert_unescape("\\", "\\\\");
        assert_unescape("", "");
}

void test_core_buffer__encode_base64(void)
{
        git_buf buf = GIT_BUF_INIT;

        /*     t  h  i  s
         * 0x 74 68 69 73
     * 0b 01110100 01101000 01101001 01110011
         * 0b 011101 000110 100001 101001 011100 110000
         * 0x 1d 06 21 29 1c 30
         *     d  G  h  p  c  w
         */
        cl_git_pass(git_buf_encode_base64(&buf, "this", 4));
        cl_assert_equal_s("dGhpcw==", buf.ptr);

        git_buf_clear(&buf);
        cl_git_pass(git_buf_encode_base64(&buf, "this!", 5));
        cl_assert_equal_s("dGhpcyE=", buf.ptr);

        git_buf_clear(&buf);
        cl_git_pass(git_buf_encode_base64(&buf, "this!\n", 6));
        cl_assert_equal_s("dGhpcyEK", buf.ptr);

        git_buf_dispose(&buf);
}

void test_core_buffer__decode_base64(void)
{
        git_buf buf = GIT_BUF_INIT;

        cl_git_pass(git_buf_decode_base64(&buf, "dGhpcw==", 8));
        cl_assert_equal_s("this", buf.ptr);

        git_buf_clear(&buf);
        cl_git_pass(git_buf_decode_base64(&buf, "dGhpcyE=", 8));
        cl_assert_equal_s("this!", buf.ptr);

        git_buf_clear(&buf);
        cl_git_pass(git_buf_decode_base64(&buf, "dGhpcyEK", 8));
        cl_assert_equal_s("this!\n", buf.ptr);

        cl_git_fail(git_buf_decode_base64(&buf, "This is not a valid base64 string!!!", 36));
        cl_assert_equal_s("this!\n", buf.ptr);

        git_buf_dispose(&buf);
}

void test_core_buffer__encode_base85(void)
{
        git_buf buf = GIT_BUF_INIT;

        cl_git_pass(git_buf_encode_base85(&buf, "this", 4));
        cl_assert_equal_s("bZBXF", buf.ptr);
        git_buf_clear(&buf);

        cl_git_pass(git_buf_encode_base85(&buf, "two rnds", 8));
        cl_assert_equal_s("ba!tca&BaE", buf.ptr);
        git_buf_clear(&buf);

        cl_git_pass(git_buf_encode_base85(&buf, "this is base 85 encoded",
                strlen("this is base 85 encoded")));
        cl_assert_equal_s("bZBXFAZc?TVqtS-AUHK3Wo~0{WMyOk", buf.ptr);
        git_buf_clear(&buf);

        git_buf_dispose(&buf);
}

void test_core_buffer__decode_base85(void)
{
        git_buf buf = GIT_BUF_INIT;

        cl_git_pass(git_buf_decode_base85(&buf, "bZBXF", 5, 4));
        cl_assert_equal_sz(4, buf.size);
        cl_assert_equal_s("this", buf.ptr);
        git_buf_clear(&buf);

        cl_git_pass(git_buf_decode_base85(&buf, "ba!tca&BaE", 10, 8));
        cl_assert_equal_sz(8, buf.size);
        cl_assert_equal_s("two rnds", buf.ptr);
        git_buf_clear(&buf);

        cl_git_pass(git_buf_decode_base85(&buf, "bZBXFAZc?TVqtS-AUHK3Wo~0{WMyOk", 30, 23));
        cl_assert_equal_sz(23, buf.size);
        cl_assert_equal_s("this is base 85 encoded", buf.ptr);
        git_buf_clear(&buf);

        git_buf_dispose(&buf);
}

void test_core_buffer__decode_base85_fails_gracefully(void)
{
        git_buf buf = GIT_BUF_INIT;

        git_buf_puts(&buf, "foobar");

        cl_git_fail(git_buf_decode_base85(&buf, "invalid charsZZ", 15, 42));
        cl_git_fail(git_buf_decode_base85(&buf, "invalidchars__ ", 15, 42));
        cl_git_fail(git_buf_decode_base85(&buf, "overflowZZ~~~~~", 15, 42));
        cl_git_fail(git_buf_decode_base85(&buf, "truncated", 9, 42));
        cl_assert_equal_sz(6, buf.size);
        cl_assert_equal_s("foobar", buf.ptr);

        git_buf_dispose(&buf);
}

void test_core_buffer__classify_with_utf8(void)
{
        char *data0 = "Simple text\n";
        size_t data0len = 12;
        char *data1 = "Is that UTF-8 data I see…\nYep!\n";
        size_t data1len = 31;
        char *data2 = "Internal NUL!!!\000\n\nI see you!\n";
        size_t data2len = 29;
        char *data3 = "\xef\xbb\xbfThis is UTF-8 with a BOM.\n";
        size_t data3len = 20;
        git_buf b;

        b.ptr = data0; b.size = b.asize = data0len;
        cl_assert(!git_buf_is_binary(&b));
        cl_assert(!git_buf_contains_nul(&b));

        b.ptr = data1; b.size = b.asize = data1len;
        cl_assert(!git_buf_is_binary(&b));
        cl_assert(!git_buf_contains_nul(&b));

        b.ptr = data2; b.size = b.asize = data2len;
        cl_assert(git_buf_is_binary(&b));
        cl_assert(git_buf_contains_nul(&b));

        b.ptr = data3; b.size = b.asize = data3len;
        cl_assert(!git_buf_is_binary(&b));
        cl_assert(!git_buf_contains_nul(&b));
}

#define SIMILARITY_TEST_DATA_1 \
        "000\n001\n002\n003\n004\n005\n006\n007\n008\n009\n" \
        "010\n011\n012\n013\n014\n015\n016\n017\n018\n019\n" \
        "020\n021\n022\n023\n024\n025\n026\n027\n028\n029\n" \
        "030\n031\n032\n033\n034\n035\n036\n037\n038\n039\n" \
        "040\n041\n042\n043\n044\n045\n046\n047\n048\n049\n"

void test_core_buffer__similarity_metric(void)
{
        git_hashsig *a, *b;
        git_buf buf = GIT_BUF_INIT;
        int sim;

        /* in the first case, we compare data to itself and expect 100% match */

        cl_git_pass(git_buf_sets(&buf, SIMILARITY_TEST_DATA_1));
        cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
        cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));

        cl_assert_equal_i(100, git_hashsig_compare(a, b));

        git_hashsig_free(a);
        git_hashsig_free(b);

        /* if we change just a single byte, how much does that change magnify? */

        cl_git_pass(git_buf_sets(&buf, SIMILARITY_TEST_DATA_1));
        cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
        cl_git_pass(git_buf_sets(&buf,
                "000\n001\n002\n003\n004\n005\n006\n007\n008\n009\n" \
                "010\n011\n012\n013\n014\n015\n016\n017\n018\n019\n" \
                "x020x\n021\n022\n023\n024\n025\n026\n027\n028\n029\n" \
                "030\n031\n032\n033\n034\n035\n036\n037\n038\n039\n" \
                "040\n041\n042\n043\n044\n045\n046\n047\n048\n049\n"
                ));
        cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));

        sim = git_hashsig_compare(a, b);

        cl_assert_in_range(95, sim, 100); /* expect >95% similarity */

        git_hashsig_free(a);
        git_hashsig_free(b);

        /* let's try comparing data to a superset of itself */

        cl_git_pass(git_buf_sets(&buf, SIMILARITY_TEST_DATA_1));
        cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
        cl_git_pass(git_buf_sets(&buf, SIMILARITY_TEST_DATA_1
                "050\n051\n052\n053\n054\n055\n056\n057\n058\n059\n"));
        cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));

        sim = git_hashsig_compare(a, b);
        /* 20% lines added ~= 10% lines changed */

        cl_assert_in_range(85, sim, 95); /* expect similarity around 90% */

        git_hashsig_free(a);
        git_hashsig_free(b);

        /* what if we keep about half the original data and add half new */

        cl_git_pass(git_buf_sets(&buf, SIMILARITY_TEST_DATA_1));
        cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));
        cl_git_pass(git_buf_sets(&buf,
                "000\n001\n002\n003\n004\n005\n006\n007\n008\n009\n" \
                "010\n011\n012\n013\n014\n015\n016\n017\n018\n019\n" \
                "020x\n021\n022\n023\n024\n" \
                "x25\nx26\nx27\nx28\nx29\n" \
                "x30\nx31\nx32\nx33\nx34\nx35\nx36\nx37\nx38\nx39\n" \
                "x40\nx41\nx42\nx43\nx44\nx45\nx46\nx47\nx48\nx49\n"
                ));
        cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));

        sim = git_hashsig_compare(a, b);
        /* 50% lines changed */

        cl_assert_in_range(40, sim, 60); /* expect in the 40-60% similarity range */

        git_hashsig_free(a);
        git_hashsig_free(b);

        /* lastly, let's check that we can hash file content as well */

        cl_git_pass(git_buf_sets(&buf, SIMILARITY_TEST_DATA_1));
        cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, GIT_HASHSIG_NORMAL));

        cl_git_pass(git_futils_mkdir("scratch", 0755, GIT_MKDIR_PATH));
        cl_git_mkfile("scratch/testdata", SIMILARITY_TEST_DATA_1);
        cl_git_pass(git_hashsig_create_fromfile(
                &b, "scratch/testdata", GIT_HASHSIG_NORMAL));

        cl_assert_equal_i(100, git_hashsig_compare(a, b));

        git_hashsig_free(a);
        git_hashsig_free(b);

        git_buf_dispose(&buf);
        git_futils_rmdir_r("scratch", NULL, GIT_RMDIR_REMOVE_FILES);
}


void test_core_buffer__similarity_metric_whitespace(void)
{
        git_hashsig *a, *b;
        git_buf buf = GIT_BUF_INIT;
        int sim, i, j;
        git_hashsig_option_t opt;
        const char *tabbed =
                "       for (s = 0; s < sizeof(sep) / sizeof(char); ++s) {\n"
                "               separator = sep[s];\n"
                "               expect = expect_values[s];\n"
                "\n"
                "               for (j = 0; j < sizeof(b) / sizeof(char*); ++j) {\n"
                "                       for (i = 0; i < sizeof(a) / sizeof(char*); ++i) {\n"
                "                               git_buf_join(&buf, separator, a[i], b[j]);\n"
                "                               cl_assert_equal_s(*expect, buf.ptr);\n"
                "                               expect++;\n"
                "                       }\n"
                "               }\n"
                "       }\n";
        const char *spaced =
                "   for (s = 0; s < sizeof(sep) / sizeof(char); ++s) {\n"
                "       separator = sep[s];\n"
                "       expect = expect_values[s];\n"
                "\n"
                "       for (j = 0; j < sizeof(b) / sizeof(char*); ++j) {\n"
                "           for (i = 0; i < sizeof(a) / sizeof(char*); ++i) {\n"
                "               git_buf_join(&buf, separator, a[i], b[j]);\n"
                "               cl_assert_equal_s(*expect, buf.ptr);\n"
                "               expect++;\n"
                "           }\n"
                "       }\n"
                "   }\n";
        const char *crlf_spaced2 =
                "  for (s = 0; s < sizeof(sep) / sizeof(char); ++s) {\r\n"
                "    separator = sep[s];\r\n"
                "    expect = expect_values[s];\r\n"
                "\r\n"
                "    for (j = 0; j < sizeof(b) / sizeof(char*); ++j) {\r\n"
                "      for (i = 0; i < sizeof(a) / sizeof(char*); ++i) {\r\n"
                "        git_buf_join(&buf, separator, a[i], b[j]);\r\n"
                "        cl_assert_equal_s(*expect, buf.ptr);\r\n"
                "        expect++;\r\n"
                "      }\r\n"
                "    }\r\n"
                "  }\r\n";
        const char *text[3] = { tabbed, spaced, crlf_spaced2 };

        /* let's try variations of our own code with whitespace changes */

        for (opt = GIT_HASHSIG_NORMAL; opt <= GIT_HASHSIG_SMART_WHITESPACE; ++opt) {
                for (i = 0; i < 3; ++i) {
                        for (j = 0; j < 3; ++j) {
                                cl_git_pass(git_buf_sets(&buf, text[i]));
                                cl_git_pass(git_hashsig_create(&a, buf.ptr, buf.size, opt));

                                cl_git_pass(git_buf_sets(&buf, text[j]));
                                cl_git_pass(git_hashsig_create(&b, buf.ptr, buf.size, opt));

                                sim = git_hashsig_compare(a, b);

                                if (opt == GIT_HASHSIG_NORMAL) {
                                        if (i == j)
                                                cl_assert_equal_i(100, sim);
                                        else
                                                cl_assert_in_range(0, sim, 30); /* pretty different */
                                } else {
                                        cl_assert_equal_i(100, sim);
                                }

                                git_hashsig_free(a);
                                git_hashsig_free(b);
                        }
                }
        }

        git_buf_dispose(&buf);
}

#include "../filter/crlf.h"

#define check_buf(expected,buf) do { \
        cl_assert_equal_s(expected, buf.ptr); \
        cl_assert_equal_sz(strlen(expected), buf.size); } while (0)

void test_core_buffer__lf_and_crlf_conversions(void)
{
        git_buf src = GIT_BUF_INIT, tgt = GIT_BUF_INIT;

        /* LF source */

        git_buf_sets(&src, "lf\nlf\nlf\nlf\n");

        cl_git_pass(git_buf_lf_to_crlf(&tgt, &src));
        check_buf("lf\r\nlf\r\nlf\r\nlf\r\n", tgt);

        cl_git_pass(git_buf_crlf_to_lf(&tgt, &src));
        check_buf(src.ptr, tgt);

        git_buf_sets(&src, "\nlf\nlf\nlf\nlf\nlf");

        cl_git_pass(git_buf_lf_to_crlf(&tgt, &src));
        check_buf("\r\nlf\r\nlf\r\nlf\r\nlf\r\nlf", tgt);

        cl_git_pass(git_buf_crlf_to_lf(&tgt, &src));
        check_buf(src.ptr, tgt);

        /* CRLF source */

        git_buf_sets(&src, "crlf\r\ncrlf\r\ncrlf\r\ncrlf\r\n");

        cl_git_pass(git_buf_lf_to_crlf(&tgt, &src));
        check_buf("crlf\r\ncrlf\r\ncrlf\r\ncrlf\r\n", tgt);

        git_buf_sets(&src, "crlf\r\ncrlf\r\ncrlf\r\ncrlf\r\n");

        cl_git_pass(git_buf_crlf_to_lf(&tgt, &src));
        check_buf("crlf\ncrlf\ncrlf\ncrlf\n", tgt);

        git_buf_sets(&src, "\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf");

        cl_git_pass(git_buf_lf_to_crlf(&tgt, &src));
        check_buf("\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf", tgt);

        git_buf_sets(&src, "\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf\r\ncrlf");

        cl_git_pass(git_buf_crlf_to_lf(&tgt, &src));
        check_buf("\ncrlf\ncrlf\ncrlf\ncrlf\ncrlf", tgt);

        /* CRLF in LF text */

        git_buf_sets(&src, "\nlf\nlf\ncrlf\r\nlf\nlf\ncrlf\r\n");

        cl_git_pass(git_buf_lf_to_crlf(&tgt, &src));
        check_buf("\r\nlf\r\nlf\r\ncrlf\r\nlf\r\nlf\r\ncrlf\r\n", tgt);

        git_buf_sets(&src, "\nlf\nlf\ncrlf\r\nlf\nlf\ncrlf\r\n");

        cl_git_pass(git_buf_crlf_to_lf(&tgt, &src));
        check_buf("\nlf\nlf\ncrlf\nlf\nlf\ncrlf\n", tgt);

        /* LF in CRLF text */

        git_buf_sets(&src, "\ncrlf\r\ncrlf\r\nlf\ncrlf\r\ncrlf");

        cl_git_pass(git_buf_lf_to_crlf(&tgt, &src));
        check_buf("\r\ncrlf\r\ncrlf\r\nlf\r\ncrlf\r\ncrlf", tgt);

        cl_git_pass(git_buf_crlf_to_lf(&tgt, &src));
        check_buf("\ncrlf\ncrlf\nlf\ncrlf\ncrlf", tgt);

        /* bare CR test */

        git_buf_sets(&src, "\rcrlf\r\nlf\nlf\ncr\rcrlf\r\nlf\ncr\r");

        cl_git_pass(git_buf_lf_to_crlf(&tgt, &src));
        check_buf("\rcrlf\r\nlf\r\nlf\r\ncr\rcrlf\r\nlf\r\ncr\r", tgt);

        git_buf_sets(&src, "\rcrlf\r\nlf\nlf\ncr\rcrlf\r\nlf\ncr\r");

        cl_git_pass(git_buf_crlf_to_lf(&tgt, &src));
        check_buf("\rcrlf\nlf\nlf\ncr\rcrlf\nlf\ncr\r", tgt);

        git_buf_sets(&src, "\rcr\r");
        cl_git_pass(git_buf_lf_to_crlf(&tgt, &src));
        check_buf(src.ptr, tgt);
        cl_git_pass(git_buf_crlf_to_lf(&tgt, &src));
        check_buf("\rcr\r", tgt);

        git_buf_dispose(&src);
        git_buf_dispose(&tgt);

        /* blob correspondence tests */

        git_buf_sets(&src, ALL_CRLF_TEXT_RAW);
        cl_git_pass(git_buf_lf_to_crlf(&tgt, &src));
        check_buf(ALL_CRLF_TEXT_AS_CRLF, tgt);
        git_buf_sets(&src, ALL_CRLF_TEXT_RAW);
        cl_git_pass(git_buf_crlf_to_lf(&tgt, &src));
        check_buf(ALL_CRLF_TEXT_AS_LF, tgt);
        git_buf_dispose(&src);
        git_buf_dispose(&tgt);

        git_buf_sets(&src, ALL_LF_TEXT_RAW);
        cl_git_pass(git_buf_lf_to_crlf(&tgt, &src));
        check_buf(ALL_LF_TEXT_AS_CRLF, tgt);
        git_buf_sets(&src, ALL_LF_TEXT_RAW);
        cl_git_pass(git_buf_crlf_to_lf(&tgt, &src));
        check_buf(ALL_LF_TEXT_AS_LF, tgt);
        git_buf_dispose(&src);
        git_buf_dispose(&tgt);

        git_buf_sets(&src, MORE_CRLF_TEXT_RAW);
        cl_git_pass(git_buf_lf_to_crlf(&tgt, &src));
        check_buf(MORE_CRLF_TEXT_AS_CRLF, tgt);
        git_buf_sets(&src, MORE_CRLF_TEXT_RAW);
        cl_git_pass(git_buf_crlf_to_lf(&tgt, &src));
        check_buf(MORE_CRLF_TEXT_AS_LF, tgt);
        git_buf_dispose(&src);
        git_buf_dispose(&tgt);

        git_buf_sets(&src, MORE_LF_TEXT_RAW);
        cl_git_pass(git_buf_lf_to_crlf(&tgt, &src));
        check_buf(MORE_LF_TEXT_AS_CRLF, tgt);
        git_buf_sets(&src, MORE_LF_TEXT_RAW);
        cl_git_pass(git_buf_crlf_to_lf(&tgt, &src));
        check_buf(MORE_LF_TEXT_AS_LF, tgt);
        git_buf_dispose(&src);
        git_buf_dispose(&tgt);
}

void test_core_buffer__dont_grow_borrowed(void)
{
        const char *somestring = "blah blah";
        git_buf buf = GIT_BUF_INIT;

        git_buf_attach_notowned(&buf, somestring, strlen(somestring) + 1);
        cl_assert_equal_p(somestring, buf.ptr);
        cl_assert_equal_i(0, buf.asize);
        cl_assert_equal_i(strlen(somestring) + 1, buf.size);

        cl_git_fail_with(GIT_EINVALID, git_buf_grow(&buf, 1024));
}

void test_core_buffer__dont_hit_infinite_loop_when_resizing(void)
{
        git_buf buf = GIT_BUF_INIT;

        cl_git_pass(git_buf_puts(&buf, "foobar"));
        /*
         * We do not care whether this succeeds or fails, which
         * would depend on platform-specific allocation
         * semantics. We only want to know that the function
         * actually returns.
         */
        (void)git_buf_try_grow(&buf, SIZE_MAX, true);

        git_buf_dispose(&buf);
}

void test_core_buffer__avoid_printing_into_oom_buffer(void)
{
        git_buf buf = GIT_BUF_INIT;

        /* Emulate OOM situation with a previous allocation */
        buf.asize = 8;
        buf.ptr = git_buf__oom;

        /*
         * Print the same string again. As the buffer still has
         * an `asize` of 8 due to the previous print,
         * `ENSURE_SIZE` would not try to reallocate the array at
         * all. As it didn't explicitly check for `git_buf__oom`
         * in earlier versions, this would've resulted in it
         * returning successfully and thus `git_buf_puts` would
         * just print into the `git_buf__oom` array.
         */
        cl_git_fail(git_buf_puts(&buf, "foobar"));
}