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iostream: Properly support the "x" mode for SDL_IOFromFile()

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The "x" mode for `fopen()` (open file only if it doesn't exist) used to
be a glibc-exclusive extension, but was later standardized in C11, and
is now also implemented as part of every other widely-used libc:

	* musl: https://git.musl-libc.org/cgit/musl/tree/src/stdio/__fmodeflags.c?id=0ccaf0572e9cccda2cced0f7ee659af4c1c6679a
	* Android Bionic / OpenBSD: 731631f300/libc/upstream-openbsd/lib/libc/stdio/flags.c (86)
	* Apple / FreeBSD: 63976b830a/stdio/FreeBSD/flags.c (L91-L92)

As a result, "x" has already been working on all our automatically
tested platforms that implement `SDL_IOFromFile()` via `fopen()`. So
all we'd be missing for proper support is a Windows implementation
using `CREATE_NEW`, and the documentation that this mode exists and is
intended to work.
This commit is contained in:
nmlgc
2025-10-05 23:15:03 +02:00
committed by Sam Lantinga
parent 87e3250518
commit 8df057fafc
3 changed files with 18 additions and 3 deletions
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11
test/testautomation_iostream.c
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@@ -615,9 +615,9 @@ static int SDLCALL iostrm_testFileWrite(void *arg)
int result;
/* Write test. */
rw = SDL_IOFromFile(IOStreamWriteTestFilename, "w+");
SDLTest_AssertPass("Call to SDL_IOFromFile(..,\"w+\") succeeded");
SDLTest_AssertCheck(rw != NULL, "Verify opening file with SDL_IOFromFile in write mode does not return NULL");
rw = SDL_IOFromFile(IOStreamWriteTestFilename, "w+x");
SDLTest_AssertPass("Call to SDL_IOFromFile(..,\"w+x\") succeeded");
SDLTest_AssertCheck(rw != NULL, "Verify opening file with SDL_IOFromFile in exclusive write mode does not return NULL");
/* Bail out if NULL */
if (rw == NULL) {
@@ -632,6 +632,11 @@ static int SDLCALL iostrm_testFileWrite(void *arg)
SDLTest_AssertPass("Call to SDL_CloseIO() succeeded");
SDLTest_AssertCheck(result == true, "Verify result value is true; got: %d", result);
/* Exclusively opening an existing file should fail. */
rw = SDL_IOFromFile(IOStreamWriteTestFilename, "wx");
SDLTest_AssertPass("Call to SDL_IOFromFile(..,\"wx\") succeeded");
SDLTest_AssertCheck(rw == NULL, "Verify opening existing file with SDL_IOFromFile in exclusive write mode returns NULL");
return TEST_COMPLETED;
}