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Make git_message_prettify return bytes written

Browse Source 
If you want to be absolutely safe with git_message_prettify, you
can now pass a NULL pointer for the buffer and get back the number
of bytes that would be copied into the buffer.

This means that an error is a non-negative return code and a
success will be greater than zero from this function.
This commit is contained in:
Russell Belfer 2012-08-14 10:50:58 -07:00
parent fdc637c4e2
commit 85a0e28b80
3 changed files with 39 additions and 30 deletions
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8
include/git2/message.h
View File

@ -23,8 +23,9 @@ GIT_BEGIN_DECL
*
* Optionally, can remove lines starting with a "#".
*
* @param message_out The user allocated buffer which will be filled with
* the cleaned up message.
* @param message_out The user allocated buffer which will be filled with
* the cleaned up message. Pass NULL if you just want to get the size of the
* prettified message as the output value.
*
* @param size The size of the allocated buffer message_out.
*
@ -32,7 +33,8 @@ GIT_BEGIN_DECL
*
* @param strip_comments 1 to remove lines starting with a "#", 0 otherwise.
*
* @return GIT_SUCCESS or an error code
* @return -1 on error, else number of characters in prettified message
* including the trailing NUL byte
*/
GIT_EXTERN(int) git_message_prettify(char *message_out, size_t buffer_size, const char *message, int strip_comments);

26
src/message.c
View File

@ -62,23 +62,25 @@ int git_message__prettify(git_buf *message_out, const char *message, int strip_c
int git_message_prettify(char *message_out, size_t buffer_size, const char *message, int strip_comments)
{
git_buf buf = GIT_BUF_INIT;
ssize_t out_size = -1;
assert(message_out && buffer_size);
if (message_out && buffer_size)
*message_out = '\0';
*message_out = '\0';
if (git_message__prettify(&buf, message, strip_comments) < 0)
goto done;
if (git_message__prettify(&buf, message, strip_comments) < 0) {
git_buf_free(&buf);
return -1;
}
if (buf.size + 1 > buffer_size) { /* +1 for NUL byte */
if (message_out && buf.size + 1 > buffer_size) { /* +1 for NUL byte */
giterr_set(GITERR_INVALID, "Buffer too short to hold the cleaned message");
return -1;
goto done;
}
git_buf_copy_cstr(message_out, buffer_size, &buf);
git_buf_free(&buf);
if (message_out)
git_buf_copy_cstr(message_out, buffer_size, &buf);
return 0;
out_size = buf.size + 1;
done:
git_buf_free(&buf);
return out_size;
}

35
tests-clar/object/commit/commitstagedfile.c
View File

@ -109,7 +109,7 @@ void test_object_commit_commitstagedfile__generate_predictable_object_ids(void)
cl_git_pass(git_signature_new(&signature, "nulltoken", "emeric.fermas@gmail.com", 1323847743, 60));
cl_git_pass(git_tree_lookup(&tree, repo, &tree_oid));
cl_git_pass(git_message_prettify(buffer, 128, "Initial commit", 0));
cl_assert_equal_i(16, git_message_prettify(buffer, 128, "Initial commit", 0));
cl_git_pass(git_commit_create_v(
&commit_oid,
@ -133,34 +133,35 @@ void test_object_commit_commitstagedfile__message_prettify(void)
{
char buffer[100];
cl_git_pass(git_message_prettify(buffer, sizeof(buffer), "", 0));
cl_assert(git_message_prettify(buffer, sizeof(buffer), "", 0) == 1);
cl_assert_equal_s(buffer, "");
cl_git_pass(git_message_prettify(buffer, sizeof(buffer), "", 1));
cl_assert(git_message_prettify(buffer, sizeof(buffer), "", 1) == 1);
cl_assert_equal_s(buffer, "");
cl_git_pass(git_message_prettify(buffer, sizeof(buffer), "Short", 0));
cl_assert_equal_s(buffer, "Short\n");
cl_git_pass(git_message_prettify(buffer, sizeof(buffer), "Short", 1));
cl_assert_equal_s(buffer, "Short\n");
cl_assert_equal_i(7, git_message_prettify(buffer, sizeof(buffer), "Short", 0));
cl_assert_equal_s("Short\n", buffer);
cl_assert_equal_i(7, git_message_prettify(buffer, sizeof(buffer), "Short", 1));
cl_assert_equal_s("Short\n", buffer);
cl_git_pass(git_message_prettify(buffer, sizeof(buffer), "This is longer\nAnd multiline\n# with some comments still in\n", 0));
cl_assert(git_message_prettify(buffer, sizeof(buffer), "This is longer\nAnd multiline\n# with some comments still in\n", 0) > 0);
cl_assert_equal_s(buffer, "This is longer\nAnd multiline\n# with some comments still in\n");
cl_git_pass(git_message_prettify(buffer, sizeof(buffer), "This is longer\nAnd multiline\n# with some comments still in\n", 1));
cl_assert(git_message_prettify(buffer, sizeof(buffer), "This is longer\nAnd multiline\n# with some comments still in\n", 1) > 0);
cl_assert_equal_s(buffer, "This is longer\nAnd multiline\n");
/* try out overflow */
cl_git_pass(git_message_prettify(buffer, sizeof(buffer),
cl_assert(git_message_prettify(buffer, sizeof(buffer),
"1234567890" "1234567890" "1234567890" "1234567890" "1234567890"
"1234567890" "1234567890" "1234567890" "1234567890" "12345678",
0));
0) > 0);
cl_assert_equal_s(buffer,
"1234567890" "1234567890" "1234567890" "1234567890" "1234567890"
"1234567890" "1234567890" "1234567890" "1234567890" "12345678\n");
cl_git_pass(git_message_prettify(buffer, sizeof(buffer),
cl_assert(git_message_prettify(buffer, sizeof(buffer),
"1234567890" "1234567890" "1234567890" "1234567890" "1234567890"
"1234567890" "1234567890" "1234567890" "1234567890" "12345678\n",
0));
0) > 0);
cl_assert_equal_s(buffer,
"1234567890" "1234567890" "1234567890" "1234567890" "1234567890"
"1234567890" "1234567890" "1234567890" "1234567890" "12345678\n");
@ -182,9 +183,13 @@ void test_object_commit_commitstagedfile__message_prettify(void)
"1234567890" "1234567890" "1234567890" "1234567890" "1234567890""x",
0));
cl_git_pass(git_message_prettify(buffer, sizeof(buffer),
cl_assert(git_message_prettify(buffer, sizeof(buffer),
"1234567890" "1234567890" "1234567890" "1234567890" "1234567890\n"
"# 1234567890" "1234567890" "1234567890" "1234567890" "1234567890\n"
"1234567890",
1));
1) > 0);
cl_assert(git_message_prettify(NULL, 0, "", 0) == 1);
cl_assert(git_message_prettify(NULL, 0, "Short test", 0) == 12);
cl_assert(git_message_prettify(NULL, 0, "Test\n# with\nComments", 1) == 15);
}