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glibc/include/stdio.h
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

320 lines
12 KiB
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#ifndef _STDIO_H
# if !defined _ISOMAC && defined _IO_MTSAFE_IO
# include <stdio-lock.h>
# endif
/* Workaround PR90731 with GCC 9 when using ldbl redirects in C++. */
# include <bits/floatn.h>
# if defined __cplusplus && __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
# if __GNUC_PREREQ (9, 0) && !__GNUC_PREREQ (9, 3)
# pragma GCC system_header
# endif
# endif
# include <libio/stdio.h>
# ifndef _ISOMAC
# define _LIBC_STDIO_H 1
# include <libio/libio.h>
/* Now define the internal interfaces. */
/* Some libc_hidden_ldbl_proto's do not map to a unique symbol when
redirecting ldouble to _Float128 variants. We can therefore safely
directly alias them to their internal name. */
# if __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1 && IS_IN (libc)
# define stdio_hidden_ldbl_proto(p, f) \
extern __typeof (p ## f) p ## f __asm (__ASMNAME ("___ieee128_" #f));
# elif __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
# define stdio_hidden_ldbl_proto(p,f) __LDBL_REDIR1_DECL (p ## f, p ## f ## ieee128)
# else
# define stdio_hidden_ldbl_proto(p,f) libc_hidden_proto (p ## f)
# endif
/* Set the error indicator on FP. */
static inline void
fseterr_unlocked (FILE *fp)
{
fp->_flags |= _IO_ERR_SEEN;
}
extern int __fcloseall (void) attribute_hidden;
extern int __snprintf (char *__restrict __s, size_t __maxlen,
const char *__restrict __format, ...)
__attribute__ ((__format__ (__printf__, 3, 4)));
stdio_hidden_ldbl_proto (__, snprintf)
extern int __vfscanf (FILE *__restrict __s,
const char *__restrict __format,
__gnuc_va_list __arg)
__attribute__ ((__format__ (__scanf__, 2, 0)));
libc_hidden_proto (__vfscanf)
extern int __vscanf (const char *__restrict __format,
__gnuc_va_list __arg)
__attribute__ ((__format__ (__scanf__, 1, 0)));
extern __ssize_t __getline (char **__lineptr, size_t *__n,
FILE *__stream) attribute_hidden;
extern int __vsscanf (const char *__restrict __s,
const char *__restrict __format,
__gnuc_va_list __arg)
__attribute__ ((__format__ (__scanf__, 2, 0)));
extern int __sprintf_chk (char *, int, size_t, const char *, ...) __THROW;
extern int __snprintf_chk (char *, size_t, int, size_t, const char *, ...)
__THROW;
extern int __vsprintf_chk (char *, int, size_t, const char *,
__gnuc_va_list) __THROW;
extern int __vsnprintf_chk (char *, size_t, int, size_t, const char *,
__gnuc_va_list) __THROW;
extern int __printf_chk (int, const char *, ...);
extern int __fprintf_chk (FILE *, int, const char *, ...);
extern int __vprintf_chk (int, const char *, __gnuc_va_list);
extern int __vfprintf_chk (FILE *, int, const char *, __gnuc_va_list);
extern char *__fgets_unlocked_chk (char *buf, size_t size, int n, FILE *fp);
extern char *__fgets_chk (char *buf, size_t size, int n, FILE *fp);
extern int __asprintf_chk (char **, int, const char *, ...) __THROW;
extern int __vasprintf_chk (char **, int, const char *, __gnuc_va_list) __THROW;
extern int __dprintf_chk (int, int, const char *, ...);
extern int __vdprintf_chk (int, int, const char *, __gnuc_va_list);
extern int __obstack_printf_chk (struct obstack *, int, const char *, ...)
__THROW;
extern int __obstack_vprintf_chk (struct obstack *, int, const char *,
__gnuc_va_list) __THROW;
extern int __isoc99_fscanf (FILE *__restrict __stream,
const char *__restrict __format, ...) __wur;
extern int __isoc99_scanf (const char *__restrict __format, ...) __wur;
extern int __isoc99_sscanf (const char *__restrict __s,
const char *__restrict __format, ...) __THROW;
extern int __isoc99_vfscanf (FILE *__restrict __s,
const char *__restrict __format,
__gnuc_va_list __arg) __wur;
extern int __isoc99_vscanf (const char *__restrict __format,
__gnuc_va_list __arg) __wur;
extern int __isoc99_vsscanf (const char *__restrict __s,
const char *__restrict __format,
__gnuc_va_list __arg) __THROW;
extern int __isoc23_fscanf (FILE *__restrict __stream,
const char *__restrict __format, ...) __wur;
extern int __isoc23_scanf (const char *__restrict __format, ...) __wur;
extern int __isoc23_sscanf (const char *__restrict __s,
const char *__restrict __format, ...) __THROW;
extern int __isoc23_vfscanf (FILE *__restrict __s,
const char *__restrict __format,
__gnuc_va_list __arg) __wur;
extern int __isoc23_vscanf (const char *__restrict __format,
__gnuc_va_list __arg) __wur;
extern int __isoc23_vsscanf (const char *__restrict __s,
const char *__restrict __format,
__gnuc_va_list __arg) __THROW;
libc_hidden_proto (__isoc99_sscanf)
libc_hidden_proto (__isoc99_vsscanf)
libc_hidden_proto (__isoc99_vfscanf)
libc_hidden_proto (__isoc23_sscanf)
libc_hidden_proto (__isoc23_vsscanf)
libc_hidden_proto (__isoc23_vfscanf)
/* Internal uses of sscanf should call the C2X-compliant version.
Unfortunately, symbol redirection is not transitive, so the
__REDIRECT in the public header does not link up with the above
libc_hidden_proto. Bridge the gap with a macro. */
# if !__GLIBC_USE (DEPRECATED_SCANF)
# undef sscanf
# define sscanf __isoc23_sscanf
# endif
# if __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1 && IS_IN (libc)
/* These are implemented as redirects to other public API.
Therefore, the usual redirection fails to avoid PLT. */
extern __typeof (__isoc99_sscanf) ___ieee128_isoc99_sscanf __THROW;
extern __typeof (__isoc99_vsscanf) ___ieee128_isoc99_vsscanf __THROW;
extern __typeof (__isoc99_vfscanf) ___ieee128_isoc99_vfscanf __THROW;
extern __typeof (__isoc23_sscanf) ___ieee128_isoc23_sscanf __THROW;
extern __typeof (__isoc23_vsscanf) ___ieee128_isoc23_vsscanf __THROW;
extern __typeof (__isoc23_vfscanf) ___ieee128_isoc23_vfscanf __THROW;
libc_hidden_proto (___ieee128_isoc99_sscanf)
libc_hidden_proto (___ieee128_isoc99_vsscanf)
libc_hidden_proto (___ieee128_isoc99_vfscanf)
libc_hidden_proto (___ieee128_isoc23_sscanf)
libc_hidden_proto (___ieee128_isoc23_vsscanf)
libc_hidden_proto (___ieee128_isoc23_vfscanf)
#define __isoc99_sscanf ___ieee128_isoc99_sscanf
#define __isoc99_vsscanf ___ieee128_isoc99_vsscanf
#define __isoc99_vfscanf ___ieee128_isoc99_vfscanf
#define __isoc23_sscanf ___ieee128_isoc23_sscanf
#define __isoc23_vsscanf ___ieee128_isoc23_vsscanf
#define __isoc23_vfscanf ___ieee128_isoc23_vfscanf
# endif
/* Prototypes for compatibility functions. */
extern FILE *__new_tmpfile (void);
extern FILE *__old_tmpfile (void);
# define __need_size_t
# include <stddef.h>
# include <bits/types/wint_t.h>
/* Generate a unique file name (and possibly open it). */
extern int __path_search (char *__tmpl, size_t __tmpl_len,
const char *__dir, const char *__pfx,
int __try_tempdir) attribute_hidden;
extern int __gen_tempname (char *__tmpl, int __suffixlen, int __flags,
int __kind) attribute_hidden;
/* The __kind argument to __gen_tempname may be one of: */
# define __GT_FILE 0 /* create a file */
# define __GT_DIR 1 /* create a directory */
# define __GT_NOCREATE 2 /* just find a name not currently in use */
/* Print out MESSAGE (which should end with a newline) on the error output
and abort. */
extern void __libc_fatal (const char *__message)
__attribute__ ((__noreturn__));
_Noreturn void __libc_message (const char *__fnt, ...) attribute_hidden;
extern void __fortify_fail (const char *msg) __attribute__ ((__noreturn__));
libc_hidden_proto (__fortify_fail)
/* Acquire ownership of STREAM. */
extern void __flockfile (FILE *__stream) attribute_hidden;
/* Relinquish the ownership granted for STREAM. */
extern void __funlockfile (FILE *__stream) attribute_hidden;
/* Try to acquire ownership of STREAM but do not block if it is not
possible. */
extern int __ftrylockfile (FILE *__stream);
extern int __getc_unlocked (FILE *__fp) attribute_hidden;
extern wint_t __getwc_unlocked (FILE *__fp);
extern int __fxprintf (FILE *__fp, const char *__fmt, ...)
__attribute__ ((__format__ (__printf__, 2, 3))) attribute_hidden;
extern int __fxprintf_nocancel (FILE *__fp, const char *__fmt, ...)
__attribute__ ((__format__ (__printf__, 2, 3))) attribute_hidden;
int __vfxprintf (FILE *__fp, const char *__fmt, __gnuc_va_list,
unsigned int)
attribute_hidden;
extern const char *const _sys_errlist_internal[] attribute_hidden;
extern const size_t _sys_errlist_internal_len attribute_hidden;
extern const char *__get_errlist (int) attribute_hidden;
extern const char *__get_errname (int) attribute_hidden;
libc_hidden_ldbl_proto (__asprintf)
# if IS_IN (libc)
extern FILE *_IO_new_fopen (const char*, const char*);
# define fopen(fname, mode) _IO_new_fopen (fname, mode)
extern FILE *_IO_new_fdopen (int, const char*);
# define fdopen(fd, mode) _IO_new_fdopen (fd, mode)
extern int _IO_new_fclose (FILE*);
# define fclose(fp) _IO_new_fclose (fp)
extern int _IO_fputs (const char*, FILE*);
libc_hidden_proto (_IO_fputs)
/* The compiler may optimize calls to fprintf into calls to fputs.
Use libc_hidden_proto to ensure that those calls, not redirected by
the fputs macro, also do not go through the PLT. */
libc_hidden_proto (fputs)
# define fputs(str, fp) _IO_fputs (str, fp)
extern int _IO_new_fsetpos (FILE *, const __fpos_t *);
# define fsetpos(fp, posp) _IO_new_fsetpos (fp, posp)
extern int _IO_new_fgetpos (FILE *, __fpos_t *);
# define fgetpos(fp, posp) _IO_new_fgetpos (fp, posp)
# endif
extern __typeof (dprintf) __dprintf
__attribute__ ((__format__ (__printf__, 2, 3)));
stdio_hidden_ldbl_proto (__, dprintf)
libc_hidden_ldbl_proto (dprintf)
libc_hidden_ldbl_proto (fprintf)
libc_hidden_ldbl_proto (vfprintf)
libc_hidden_ldbl_proto (sprintf)
libc_hidden_proto (ungetc)
libc_hidden_proto (__getdelim)
libc_hidden_proto (fwrite)
libc_hidden_proto (perror)
libc_hidden_proto (remove)
libc_hidden_proto (rewind)
libc_hidden_proto (fileno)
extern __typeof (fileno) __fileno;
libc_hidden_proto (__fileno)
libc_hidden_proto (fwrite)
libc_hidden_proto (fseek)
extern __typeof (ftello) __ftello;
libc_hidden_proto (__ftello)
extern __typeof (fseeko64) __fseeko64;
libc_hidden_proto (__fseeko64)
extern __typeof (ftello64) __ftello64;
libc_hidden_proto (__ftello64)
libc_hidden_proto (fflush)
libc_hidden_proto (fflush_unlocked)
extern __typeof (fflush_unlocked) __fflush_unlocked;
libc_hidden_proto (__fflush_unlocked)
extern __typeof (fread_unlocked) __fread_unlocked;
libc_hidden_proto (__fread_unlocked)
libc_hidden_proto (fwrite_unlocked)
libc_hidden_proto (fgets_unlocked)
extern __typeof (fgets_unlocked) __fgets_unlocked;
libc_hidden_proto (__fgets_unlocked)
libc_hidden_proto (fputs_unlocked)
extern __typeof (fputs_unlocked) __fputs_unlocked;
libc_hidden_proto (__fputs_unlocked)
libc_hidden_proto (feof_unlocked)
extern __typeof (feof_unlocked) __feof_unlocked attribute_hidden;
libc_hidden_proto (ferror_unlocked)
extern __typeof (ferror_unlocked) __ferror_unlocked attribute_hidden;
libc_hidden_proto (getc_unlocked)
libc_hidden_proto (fputc_unlocked)
libc_hidden_proto (putc_unlocked)
extern __typeof (putc_unlocked) __putc_unlocked attribute_hidden;
libc_hidden_proto (fmemopen)
/* The prototype needs repeating instead of using __typeof to use
__THROW in C++ tests. */
extern FILE *__open_memstream (char **, size_t *) __THROW __wur;
libc_hidden_proto (__open_memstream)
libc_hidden_proto (__libc_fatal)
rtld_hidden_proto (__libc_fatal)
libc_hidden_proto (__vsprintf_chk)
extern FILE * __fmemopen (void *buf, size_t len, const char *mode);
libc_hidden_proto (__fmemopen)
extern int __gen_tempfd (int flags);
libc_hidden_proto (__gen_tempfd)
# ifdef __USE_EXTERN_INLINES
__extern_inline int
__NTH (__feof_unlocked (FILE *__stream))
{
return __feof_unlocked_body (__stream);
}
__extern_inline int
__NTH (__ferror_unlocked (FILE *__stream))
{
return __ferror_unlocked_body (__stream);
}
__extern_inline int
__getc_unlocked (FILE *__fp)
{
return __getc_unlocked_body (__fp);
}
__extern_inline int
__putc_unlocked (int __c, FILE *__stream)
{
return __putc_unlocked_body (__c, __stream);
}
# endif
extern __typeof (renameat) __renameat;
libc_hidden_proto (__renameat)
extern __typeof (renameat2) __renameat2;
libc_hidden_proto (__renameat2)
# endif /* not _ISOMAC */
#endif /* stdio.h */
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