lib/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2025-07-28 00:21:52 +03:00
Code Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

9
stdio-common/printf-parse.h
View File

@ -93,14 +93,17 @@ __find_specwc (const unsigned int *format)
with the parsed details. POSN is the number of arguments already
consumed. At most MAXTYPES - POSN types are filled in TYPES. Return
the number of args consumed by this spec; *MAX_REF_ARG is updated so it
remains the highest argument index used. */
remains the highest argument index used. *FAILED is set to indicate
whether parsing failed and printf should return with an error status. */
extern size_t __parse_one_specmb (const unsigned char *format, size_t posn,
struct printf_spec *spec,
size_t *max_ref_arg) attribute_hidden;
size_t *max_ref_arg,
bool *failed) attribute_hidden;
extern size_t __parse_one_specwc (const unsigned int *format, size_t posn,
struct printf_spec *spec,
size_t *max_ref_arg) attribute_hidden;
size_t *max_ref_arg,
bool *failed) attribute_hidden;