diff --git a/dlls/msvcrt/tests/file.c b/dlls/msvcrt/tests/file.c index f6a1624d82..00e1f90c14 100644 --- a/dlls/msvcrt/tests/file.c +++ b/dlls/msvcrt/tests/file.c @@ -2219,6 +2219,65 @@ static void test__open_osfhandle(void) CloseHandle(tmp); } +static void test_write_flush_size(FILE *file, size_t bufsize) +{ + char *inbuffer; + char *outbuffer; + size_t size; + int fd; + + fd = fileno(file); + inbuffer = calloc(bufsize + 1, 1); + outbuffer = calloc(bufsize + 1, 1); + _snprintf(outbuffer, bufsize + 1, "0,1,2,3,4,5,6,7,8,9"); + + for (size = bufsize + 1; size >= bufsize - 1; size--) { + rewind(file); + fwrite(outbuffer, 1, size, file); + /* lseek() below intentionally redirects the write in fflush() to detect + * if fwrite() has already flushed the whole buffer or not. + */ + lseek(fd, 1, SEEK_SET); + fflush(file); + fseek(file, 0, SEEK_SET); + ok(fread(inbuffer, 1, bufsize, file) == bufsize, "read failed\n"); + if (size == bufsize) + todo_wine ok(memcmp(outbuffer, inbuffer, bufsize) == 0, "missing flush by %d byte write\n", size); + else + ok(memcmp(outbuffer, inbuffer, bufsize) != 0, "unexpected flush by %d byte write\n", size); + } + rewind(file); + fwrite(outbuffer, 1, bufsize / 2, file); + fwrite(outbuffer + bufsize / 2, 1, bufsize / 2, file); + lseek(fd, 1, SEEK_SET); + fflush(file); + fseek(file, 0, SEEK_SET); + ok(fread(inbuffer, 1, bufsize, file) == bufsize, "read failed\n"); + ok(memcmp(outbuffer, inbuffer, bufsize) != 0, "unexpected flush by %d/2 byte double write\n", bufsize); + free(inbuffer); + free(outbuffer); +} + +static void test_write_flush(void) +{ + char iobuf[1024]; + char *tempf; + FILE *file; + + tempf = _tempnam(".","wne"); + file = fopen(tempf, "wb+"); + ok(file != NULL, "unable to create test file\n"); + iobuf[0] = 0; + fwrite(iobuf, 1, 1, file); /* needed for wine to init _bufsiz */ + todo_wine ok(file->_bufsiz == 4096, "incorrect default buffer size: %d", file->_bufsiz); + test_write_flush_size(file, file->_bufsiz); + setvbuf(file, iobuf, _IOFBF, sizeof(iobuf)); + test_write_flush_size(file, sizeof(iobuf)); + fclose(file); + unlink(tempf); + free(tempf); +} + START_TEST(file) { int arg_c; @@ -2284,6 +2343,7 @@ START_TEST(file) test_stdin(); test_mktemp(); test__open_osfhandle(); + test_write_flush(); /* Wait for the (_P_NOWAIT) spawned processes to finish to make sure the report * file contains lines in the correct order