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C2x printf %wN, %wfN support (bug 24466)

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ISO C2x defines printf length modifiers wN (for intN_t / int_leastN_t
/ uintN_t / uint_leastN_t) and wfN (for int_fastN_t / uint_fastN_t).
Add support for those length modifiers (such a feature was previously
requested in bug 24466).  scanf support is to be added separately.
GCC 13 has format checking support for these modifiers.

When used with the support for registering format specifiers, these
modifiers are translated to existing flags in struct printf_info,
rather than trying to add some way of distinguishing them without
breaking the printf_info ABI.  C2x requires an error to be returned
for unsupported values of N; this is implemented for printf-family
functions, but the parse_printf_format interface doesn't support error
returns, so such an error gets discarded by that function.

Tested for x86_64 and x86.
This commit is contained in:
Joseph Myers
2023-06-19 18:52:12 +00:00
parent 8022fc7d51
commit 5f83b2674e
11 changed files with 851 additions and 15 deletions
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3
stdio-common/printf-prs.c
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@ -63,6 +63,7 @@ parse_printf_format (const char *fmt, size_t n, int *argtypes)
size_t max_ref_arg; /* Highest index used in a positional arg. */
struct printf_spec spec;
const unsigned char *f = (const unsigned char *) fmt;
bool failed;
nargs = 0;
max_ref_arg = 0;
@ -71,7 +72,7 @@ parse_printf_format (const char *fmt, size_t n, int *argtypes)
for (f = __find_specmb (f); *f != '\0'; f = spec.next_fmt)
{
/* Parse this spec. */
nargs += __parse_one_specmb (f, nargs, &spec, &max_ref_arg);
nargs += __parse_one_specmb (f, nargs, &spec, &max_ref_arg, &failed);
/* If the width is determined by an argument, it is an int. */
if (spec.width_arg != -1 && (size_t) spec.width_arg < n)