thodg/libgit2/tests-clay/core/buffer.c

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• Hash : 309113c9
  Author :
  Date : 2011-11-29T23:45:17
  

  Make initial value of git_buf ptr always be a valid empty string. Taking a page from core git's strbuf, this introduces git_buf_initbuf which is an empty string that is used to initialize the git_buf ptr value even for new buffers. Now the git_buf ptr will always point to a valid NUL-terminated string. This change required jumping through a few hoops for git_buf_grow and git_buf_free to distinguish between a actual allocated buffer and the global initial value. Also, this moves the allocation related functions to be next to each other near the top of buffer.c.

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• tests-clay/core/buffer.c

• #include "clay_libgit2.h"
  #include "buffer.h"
  
  #define TESTSTR "Have you seen that? Have you seeeen that??"
  const char *test_string = TESTSTR;
  const char *test_string_x2 = TESTSTR TESTSTR;
  
  #define REP4(STR)	 STR STR STR STR
  #define REP16(STR)	 REP4(REP4(STR))
  #define REP1024(STR) REP16(REP16(REP4(STR)))
  #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_strequal(test_string, git_buf_cstr(&buf));
  
  	git_buf_puts(&buf, test_string);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_strequal(test_string_x2, git_buf_cstr(&buf));
  
  	git_buf_free(&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_strequal("shoop da 23 ", git_buf_cstr(&buf));
  
  	git_buf_printf(&buf, "%s %d", "woop", 42);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_strequal("shoop da 23 woop 42", git_buf_cstr(&buf));
  
  	git_buf_free(&buf);
  }
  
  /* more thorough test of concatenation options */
  void test_core_buffer__2(void)
  {
  	git_buf buf = GIT_BUF_INIT;
  	int i;
  	char data[100];
  
  	cl_assert(buf.size == 0);
  
  	/* this must be safe to do */
  	git_buf_free(&buf);
  	cl_assert(buf.size == 0);
  	cl_assert(buf.asize == 0);
  
  	/* empty buffer should be empty string */
  	cl_assert_strequal("", 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_free(&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_strequal("+", git_buf_cstr(&buf));
  
  	/* add letter again */
  	git_buf_putc(&buf, '+');
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_strequal("++", 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_strequal("++++++++++++++++++", git_buf_cstr(&buf));
  
  	git_buf_free(&buf);
  
  	/* add data */
  	git_buf_put(&buf, "xo", 2);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_strequal("xo", git_buf_cstr(&buf));
  
  	/* add letter again */
  	git_buf_put(&buf, "xo", 2);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_strequal("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_strequal("xoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxoxo",
  					   git_buf_cstr(&buf));
  
  	git_buf_free(&buf);
  
  	/* set to string */
  	git_buf_sets(&buf, test_string);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_strequal(test_string, git_buf_cstr(&buf));
  
  	/* append string */
  	git_buf_puts(&buf, test_string);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_strequal(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_strequal(test_string, git_buf_cstr(&buf));
  
  	/* test clear */
  	git_buf_clear(&buf);
  	cl_assert_strequal("", git_buf_cstr(&buf));
  
  	git_buf_free(&buf);
  
  	/* test extracting data into buffer */
  	git_buf_puts(&buf, REP4("0123456789"));
  	cl_assert(git_buf_oom(&buf) == 0);
  
  	git_buf_copy_cstr(data, 100, &buf);
  	cl_assert_strequal(data, REP4("0123456789"));
  	git_buf_copy_cstr(data, 11, &buf);
  	cl_assert_strequal(data, "0123456789");
  	git_buf_copy_cstr(data, 3, &buf);
  	cl_assert_strequal(data, "01");
  	git_buf_copy_cstr(data, 1, &buf);
  	cl_assert_strequal(data, "");
  
  	git_buf_copy_cstr(data, 100, &buf);
  	cl_assert_strequal(data, REP4("0123456789"));
  
  	git_buf_free(&buf);
  
  	git_buf_copy_cstr(data, 100, &buf);
  	cl_assert_strequal(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_strequal(test_4096, git_buf_cstr(&buf));
  
  	/* append string */
  	git_buf_puts(&buf, test_4096);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_strequal(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_strequal(test_4096, git_buf_cstr(&buf));
  
  	git_buf_free(&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_strequal("12341234123412341234", git_buf_cstr(&buf));
  
  	git_buf_consume(&buf, NULL);
  	cl_assert_strequal("12341234123412341234", git_buf_cstr(&buf));
  
  	git_buf_consume(&buf, "invalid pointer");
  	cl_assert_strequal("12341234123412341234", git_buf_cstr(&buf));
  
  	git_buf_consume(&buf, buf.ptr);
  	cl_assert_strequal("12341234123412341234", git_buf_cstr(&buf));
  
  	git_buf_consume(&buf, buf.ptr + 1);
  	cl_assert_strequal("2341234123412341234", git_buf_cstr(&buf));
  
  	git_buf_consume(&buf, buf.ptr + buf.size);
  	cl_assert_strequal("", git_buf_cstr(&buf));
  
  	git_buf_free(&buf);
  }
  
  
  static void
  check_buf_append(
  	const char* data_a,
  	const char* data_b,
  	const char* expected_data,
  	ssize_t expected_size,
  	ssize_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_strequal(expected_data, git_buf_cstr(&tgt));
  	cl_assert(tgt.size == expected_size);
  	if (expected_asize > 0)
  		cl_assert(tgt.asize == expected_asize);
  
  	git_buf_free(&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_strequal(buf_a, git_buf_cstr(&buf));
  
  	git_buf_puts(&buf, buf_b);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_strequal(expected_ab, git_buf_cstr(&buf));
  
  	git_buf_puts(&buf, buf_c);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_strequal(expected_abc, git_buf_cstr(&buf));
  
  	git_buf_puts(&buf, buf_a);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_strequal(expected_abca, git_buf_cstr(&buf));
  
  	git_buf_puts(&buf, buf_b);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_strequal(expected_abcab, git_buf_cstr(&buf));
  
  	git_buf_puts(&buf, buf_c);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_strequal(expected_abcabc, git_buf_cstr(&buf));
  
  	git_buf_free(&buf);
  }
  
  /* more variations on append tests */
  void test_core_buffer__5(void)
  {
  	check_buf_append("", "", "", 0, 8);
  	check_buf_append("a", "", "a", 1, 8);
  	check_buf_append("", "a", "a", 1, 8);
  	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, 9240);
  
  	/* 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_strequal("foo", git_buf_cstr(&a));
  	cl_assert_strequal("bar", git_buf_cstr(&b));
  
  	git_buf_swap(&a, &b);
  
  	cl_assert_strequal("bar", git_buf_cstr(&a));
  	cl_assert_strequal("foo", git_buf_cstr(&b));
  
  	git_buf_free(&a);
  	git_buf_free(&b);
  }
  
  
  /* test take cstr data */
  void test_core_buffer__7(void)
  {
  	git_buf a = GIT_BUF_INIT;
  	char *b = NULL;
  
  	git_buf_sets(&a, "foo");
  	cl_assert(git_buf_oom(&a) == 0);
  	cl_assert_strequal("foo", git_buf_cstr(&a));
  
  	b = git_buf_take_cstr(&a);
  
  	cl_assert_strequal("foo", b);
  	cl_assert_strequal("", a.ptr);
  	git__free(b);
  
  	b = git_buf_take_cstr(&a);
  
  	cl_assert_strequal(NULL, b);
  	cl_assert_strequal("", a.ptr);
  
  	git_buf_free(&a);
  }
  
  
  static void
  check_joinbuf_2(
  	const char *a,
  	const char *b,
  	const char *expected)
  {
  	char sep = '/';
  	git_buf buf = GIT_BUF_INIT;
  
  	/* first validate join from nothing */
  	git_buf_join(&buf, sep, a, b);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_strequal(expected, git_buf_cstr(&buf));
  	git_buf_free(&buf);
  
  	/* next validate join-append */
  	git_buf_sets(&buf, a);
  	cl_assert(git_buf_oom(&buf) == 0);
  	git_buf_join(&buf, sep, NULL, b);
  	cl_assert(git_buf_oom(&buf) == 0);
  	cl_assert_strequal(expected, git_buf_cstr(&buf));
  
  	git_buf_free(&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_strequal(expected, git_buf_cstr(&buf));
  
  	git_buf_free(&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_strequal(expected, git_buf_cstr(&buf));
  	git_buf_free(&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_strequal("foo", git_buf_cstr(&a));
  
  	git_buf_join_n(&a, '/', 1, "bar");
  	cl_assert(git_buf_oom(&a) == 0);
  	cl_assert_strequal("foo/bar", git_buf_cstr(&a));
  
  	git_buf_join_n(&a, '/', 1, "baz");
  	cl_assert(git_buf_oom(&a) == 0);
  	cl_assert_strequal("foo/bar/baz", git_buf_cstr(&a));
  
  	git_buf_free(&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_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;");
  }
  
  

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