[LTP] Add safe macros for stream testing suite

[acervesato@git]

Hi Andrea,

our agent completed the review of the patch.

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--- Reply to [PATCH 1/6] ---

On 2026-03-04, Andrea Cervesato wrote:
> Add safe macros for stream testing suite

> +size_t safe_fread(const char *file, const int lineno,
> +	void *ptr, size_t size, size_t n, FILE *stream)
> +{
> +	size_t ret;
> +
> +	ret = fread(ptr, size, n, stream);
> +	if (ret != n) {
> +		tst_brkm_(file, lineno, TBROK, NULL,
> +			"fread(%p, %lu, %lu, %p) read %lu bytes",
> +			ptr, size, n, stream, ret);

%lu is wrong for size_t on ILP32; use %zu. Also, ret is an item count,
not bytes — the message is misleading. Same issue in safe_fwrite.

Use TBROK | TERRNO here and in safe_fwrite; errno is set on actual I/O
errors, not just EOF.

> +FILE *safe_freopen(const char *file, const int lineno,
> +	       const char *path, const char *mode, FILE *stream)

Continuation-line alignment is inconsistent with the declaration in
safe_stdio_fn.h. Same applies to safe_fseek, safe_ftell. Align to the
opening parenthesis using tabs+spaces as in the header.

--- Reply to [PATCH 2/6] ---

On 2026-03-04, Andrea Cervesato wrote:
> fs: rewrite stream01 test using new API

Commit body is missing. Explain why the conversion is done (e.g. "Old
API is deprecated; convert to new tst_test.h-based API."). Same applies
to patches 3/6–6/6.

> +static void read_file(const char *file, const char *str, size_t n)
> +{
> +	char buf[n];
> +	...
> +	len = SAFE_FREAD(buf, n, n, stream);

fread(buf, n, n) attempts to read n*n bytes into a n-byte VLA — buffer
overflow. Change to SAFE_FREAD(buf, 1, n, stream).

> +	SAFE_FWRITE(buff_file1, strlen(buff_file1), 3, stream);

fwrite("abc", 3, 3) reads 9 bytes from a 3-byte literal — out-of-bounds
read. Change to SAFE_FWRITE(buff_file1, 1, strlen(buff_file1), stream).

--- Reply to [PATCH 3/6] ---

On 2026-03-04, Andrea Cervesato wrote:
> fs: rewrite stream02 test using new API

> +		stream = SAFE_FOPEN(FILENAME, modes[i]);
> +		if (!stream) {
> +			tst_res(TFAIL, "fopen(%s) returned NULL pointer", modes[i]);
> +			return;
> +		}

SAFE_FOPEN never returns NULL — it calls tst_brk(TBROK) on failure.
Remove the dead null check.

--- Reply to [PATCH 4/6] ---

On 2026-03-04, Andrea Cervesato wrote:
> fs: rewrite stream03 test using new API

> +	rewind(stream);
> +	TST_EXP_EQ_LI(SAFE_FTELL(stream), SEEK_SET);

SEEK_SET is a seek-direction constant (value 0), not a file position.
Use 0 as the expected value to avoid confusion.

Regards,
LTP AI Reviewer