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tests: Add a basic test for g_scanner_sync_file_offset()

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See https://gitlab.gnome.org/GNOME/glib/-/merge_requests/4387#note_2269328

Signed-off-by: Philip Withnall <pwithnall@gnome.org>
This commit is contained in:
Philip Withnall
2025-02-06 12:11:11 +00:00
parent 020e58bac5
commit 8e39ad2660
1 changed files with 63 additions and 0 deletions
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63
glib/tests/scannerapi.c
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@@ -213,6 +213,68 @@ test_scanner_fd_input (void)
} }
} }
static void
test_scanner_fd_input_rewind (void)
{
/* GScanner does some internal buffering when reading from an FD, reading in
* chunks of `READ_BUFFER_SIZE` (currently 4000B) to an internal buffer. It
* allows the input FD’s file offset to be positioned to match the current
* parsing position. Test that works. */
GScanner *scanner = NULL;
char *filename = NULL;
int fd = -1;
char *buf = NULL;
const size_t whitespace_len = 4000;
size_t buflen;
const char *buf_suffix = "({})";
const struct
{
GTokenType expected_token;
off_t expected_offset; /* offset after consuming @expected_token */
}
tokens_and_offsets[] =
{
{ G_TOKEN_LEFT_PAREN, whitespace_len + 1 },
{ G_TOKEN_LEFT_CURLY, whitespace_len + 2 },
{ G_TOKEN_RIGHT_CURLY, whitespace_len + 3 },
{ G_TOKEN_RIGHT_PAREN, whitespace_len + 4 },
};
buflen = whitespace_len + strlen (buf_suffix) + 1;
buf = g_malloc (buflen);
memset (buf, ' ', whitespace_len);
memcpy (buf + whitespace_len, buf_suffix, strlen (buf_suffix));
buf[buflen - 1] = '\0';
scanner = g_scanner_new (NULL);
filename = g_strdup ("scanner-fd-input-XXXXXX");
fd = g_mkstemp (filename);
g_assert_cmpint (fd, >=, 0);
g_assert_cmpint (write (fd, buf, buflen), ==, buflen);
g_assert_no_errno (lseek (fd, 0, SEEK_SET));
g_scanner_input_file (scanner, fd);
g_assert_cmpint (g_scanner_cur_token (scanner), ==, G_TOKEN_NONE);
for (size_t i = 0; i < G_N_ELEMENTS (tokens_and_offsets); i++)
{
g_scanner_get_next_token (scanner);
g_scanner_sync_file_offset (scanner);
g_assert_cmpint (g_scanner_cur_token (scanner), ==, tokens_and_offsets[i].expected_token);
g_assert_cmpint (lseek (fd, 0, SEEK_CUR), ==, tokens_and_offsets[i].expected_offset);
}
g_assert_cmpint (g_scanner_get_next_token (scanner), ==, G_TOKEN_EOF);
g_close (fd, NULL);
g_free (filename);
g_free (buf);
g_scanner_destroy (scanner);
}
int int
main (int argc, main (int argc,
char *argv[]) char *argv[])
@@ -225,6 +287,7 @@ main (int argc,
g_test_add ("/scanner/tokens", ScannerFixture, 0, scanner_fixture_setup, test_scanner_tokens, scanner_fixture_teardown); g_test_add ("/scanner/tokens", ScannerFixture, 0, scanner_fixture_setup, test_scanner_tokens, scanner_fixture_teardown);
g_test_add_func ("/scanner/multiline-comment", test_scanner_multiline_comment); g_test_add_func ("/scanner/multiline-comment", test_scanner_multiline_comment);
g_test_add_func ("/scanner/fd-input", test_scanner_fd_input); g_test_add_func ("/scanner/fd-input", test_scanner_fd_input);
g_test_add_func ("/scanner/fd-input/rewind", test_scanner_fd_input_rewind);
return g_test_run(); return g_test_run();
} }