glibc/support
Joseph Myers dee2bea048 C2x scanf binary constant handling
C2x adds binary integer constants starting with 0b or 0B, and supports
those constants for the %i scanf format (in addition to the %b format,
which isn't yet implemented for scanf in glibc).  Implement that scanf
support for glibc.

As with the strtol support, this is incompatible with previous C
standard versions, in that such an input string starting with 0b or 0B
was previously required to be parsed as 0 (with the rest of the input
potentially matching subsequent parts of the scanf format string).
Thus this patch adds 12 new __isoc23_* functions per long double
format (12, 24 or 36 depending on how many long double formats the
glibc configuration supports), with appropriate header redirection
support (generally very closely following that for the __isoc99_*
scanf functions - note that __GLIBC_USE (DEPRECATED_SCANF) takes
precedence over __GLIBC_USE (C2X_STRTOL), so the case of GNU
extensions to C89 continues to get old-style GNU %a and does not get
this new feature).  The function names would remain as __isoc23_* even
if C2x ends up published in 2024 rather than 2023.

When scanf %b support is added, I think it will be appropriate for all
versions of scanf to follow C2x rules for inputs to the %b format
(given that there are no compatibility concerns for a new format).

Tested for x86_64 (full glibc testsuite).  The first version was also
tested for powerpc (32-bit) and powerpc64le (stdio-common/ and wcsmbs/
tests), and with build-many-glibcs.py.
2023-03-02 19:10:37 +00:00
..
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check_addrinfo.c Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
check_dns_packet.c Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
check_hostent.c Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
check_netent.c Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
check_nss.h Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
check.c Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
check.h Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
delayed_exit.c Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
Depend elf: Testing infrastructure for ld.so DSO sorting (BZ #17645) 2021-10-21 11:23:53 -03:00
descriptors.h Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
echo-container.c Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
format_nss.h Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
ignore_stderr.c Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
links-dso-program-c.c nss_db: fix endent wrt NULL mappings [BZ #24695] [BZ #24696] 2019-07-10 14:51:18 -04:00
links-dso-program.cc nss_db: fix endent wrt NULL mappings [BZ #24695] [BZ #24696] 2019-07-10 14:51:18 -04:00
Makefile C2x scanf binary constant handling 2023-03-02 19:10:37 +00:00
namespace.h Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
next_to_fault.c Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
next_to_fault.h Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
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process_state.h Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
README support: Add timespec.h 2019-05-09 14:33:53 -03:00
README-testing.c support: Introduce new subdirectory for test infrastructure 2016-12-09 08:18:27 +01:00
resolv_response_context_duplicate.c Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
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set_fortify_handler.c Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
shell-container.c support: use 64-bit time_t (bug 30111) 2023-03-02 13:01:32 +01:00
subprocess.h Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
support_become_root.c Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
support_can_chroot.c support: use 64-bit time_t (bug 30111) 2023-03-02 13:01:32 +01:00
support_capture_subprocess_check.c Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
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support_chroot.c Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
support_copy_file_range.c Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
support_copy_file.c support: use 64-bit time_t (bug 30111) 2023-03-02 13:01:32 +01:00
support_create_timer.c Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
support_descriptor_supports_holes.c support: use 64-bit time_t (bug 30111) 2023-03-02 13:01:32 +01:00
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test-container.c support: use 64-bit time_t (bug 30111) 2023-03-02 13:01:32 +01:00
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timespec-add-time64.c Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
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xfork.c Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
xfreopen.c C2x scanf binary constant handling 2023-03-02 19:10:37 +00:00
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This subdirectory contains infrastructure which is not put into
installed libraries, but may be linked into programs (installed or
not) and tests.

# Error-checking wrappers

These wrappers test for error return codes an terminate the process on
error.  They are declared in these header files:

* support.h
* xsignal.h
* xthread.h
* xtime.h

In general, new wrappers should be added to support.h if possible.
However, support.h must remain fully compatible with C90 and therefore
cannot include headers which use identifers not reserved in C90.  If
the wrappers need additional types, additional headers such as
signal.h need to be introduced.

# Test framework

The test framework provides a main program for tests, including a
timeout for hanging tests.  See README-testing.c for a minimal
example, and test-driver.c for details how to use it.  The following
header files provide related declarations:

* check.h
* temp_file.h
* test-driver.h

For tests that make use of struct timespec, the following header files
contain additional macros and helper functions:

* timespec.h