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698fb75b9f
There are a lot more printf variants than there are scanf variants,
and the code for setting up and tearing down their custom FILE
variants around the call to __vf(w)printf is more complicated and
variable. Therefore, I have added _internal versions of all the
v*printf variants, rather than introducing helper routines so that
they can all directly call __vf(w)printf_internal, as was done with
scanf.
As with the scanf changes, in this patch the _internal functions still
look at the environmental mode bits and all callers pass 0 for the
flags parameter.
Several of the affected public functions had _IO_ name aliases that
were not exported (but, in one case, appeared in libio.h anyway);
I was originally planning to leave them as aliases to avoid having
to touch internal callers, but it turns out ldbl_*_alias only work
for exported symbols, so they've all been removed instead. It also
turns out there were hardly any internal callers. _IO_vsprintf and
_IO_vfprintf *are* exported, so those two stick around.
Summary for the changes to each of the affected symbols:
_IO_vfprintf, _IO_vsprintf:
All internal calls removed, thus the internal declarations, as well
as uses of libc_hidden_proto and libc_hidden_def, were also removed.
The external symbol is now exposed via uses of ldbl_strong_alias
to __vfprintf_internal and __vsprintf_internal, respectively.
_IO_vasprintf, _IO_vdprintf, _IO_vsnprintf,
_IO_vfwprintf, _IO_vswprintf,
_IO_obstack_vprintf, _IO_obstack_printf:
All internal calls removed, thus declaration in internal headers
were also removed. They were never exported, so there are no
aliases tying them to the internal functions. I.e.: entirely gone.
__vsnprintf:
Internal calls were always preceded by macros such as
#define __vsnprintf _IO_vsnprintf, and
#define __vsnprintf vsnprintf
The macros were removed and their uses replaced with calls to the
new internal function __vsnprintf_internal. Since there were no
internal calls, the internal declaration was also removed. The
external symbol is preserved with ldbl_weak_alias to ___vsnprintf.
__vfwprintf:
All internal calls converted into calls to __vfwprintf_internal,
thus the internal declaration was removed. The function is now a
wrapper that calls __vfwprintf_internal. The external symbol is
preserved.
__vswprintf:
Similarly, but no external symbol.
__vasprintf, __vdprintf, __vfprintf, __vsprintf:
New internal wrappers. Not exported.
vasprintf, vdprintf, vfprintf, vsprintf, vsnprintf,
vfwprintf, vswprintf,
obstack_vprintf, obstack_printf:
These functions used to be aliases to the respective _IO_* function,
they are now aliases to their respective __* functions.
Tested for powerpc and powerpc64le.
156 lines
4.9 KiB
C
156 lines
4.9 KiB
C
/* Convert a floating-point number to string.
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Copyright (C) 2016-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* Generic implementation for strfrom functions. The implementation is generic
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for several floating-point types (e.g.: float, double), so that each
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function, such as strfromf and strfroml, share the same code, thus avoiding
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code duplication. */
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#include <ctype.h>
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#include "../libio/libioP.h"
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#include "../libio/strfile.h"
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#include <printf.h>
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#include <string.h>
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#include <locale/localeinfo.h>
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#define UCHAR_T char
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#define L_(Str) Str
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#define ISDIGIT(Ch) isdigit (Ch)
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#include "stdio-common/printf-parse.h"
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int
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STRFROM (char *dest, size_t size, const char *format, FLOAT f)
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{
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_IO_strnfile sfile;
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#ifdef _IO_MTSAFE_IO
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sfile.f._sbf._f._lock = NULL;
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#endif
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int done;
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/* Single-precision values need to be stored in a double type, because
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__printf_fp_l and __printf_fphex do not accept the float type. */
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union {
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double flt;
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FLOAT value;
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} fpnum;
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const void *fpptr;
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fpptr = &fpnum;
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/* Variables to control the output format. */
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int precision = -1; /* printf_fp and printf_fphex treat this internally. */
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int specifier;
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struct printf_info info;
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/* Single-precision values need to be converted into double-precision,
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because __printf_fp and __printf_fphex only accept double and long double
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as the floating-point argument. */
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if (__builtin_types_compatible_p (FLOAT, float))
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fpnum.flt = f;
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else
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fpnum.value = f;
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/* Check if the first character in the format string is indeed the '%'
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character. Otherwise, abort. */
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if (*format == '%')
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format++;
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else
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abort ();
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/* The optional precision specification always starts with a '.'. If such
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character is present, read the precision. */
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if (*format == '.')
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{
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format++;
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/* Parse the precision. */
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if (ISDIGIT (*format))
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precision = read_int (&format);
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/* If only the period is specified, the precision is taken as zero, as
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described in ISO/IEC 9899:2011, section 7.21.6.1, 4th paragraph, 3rd
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item. */
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else
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precision = 0;
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}
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/* Now there is only the conversion specifier to be read. */
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switch (*format)
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{
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case 'a':
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case 'A':
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case 'e':
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case 'E':
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case 'f':
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case 'F':
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case 'g':
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case 'G':
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specifier = *format;
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break;
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default:
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abort ();
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}
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/* The following code to prepare the virtual file has been adapted from the
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function __vsnprintf_internal from libio. */
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if (size == 0)
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{
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/* When size is zero, nothing is written and dest may be a null pointer.
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This is specified for snprintf in ISO/IEC 9899:2011, Section 7.21.6.5,
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in the second paragraph. Thus, if size is zero, prepare to use the
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overflow buffer right from the start. */
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dest = sfile.overflow_buf;
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size = sizeof (sfile.overflow_buf);
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}
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/* Prepare the virtual string file. */
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_IO_no_init (&sfile.f._sbf._f, _IO_USER_LOCK, -1, NULL, NULL);
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_IO_JUMPS (&sfile.f._sbf) = &_IO_strn_jumps;
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_IO_str_init_static_internal (&sfile.f, dest, size - 1, dest);
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/* Prepare the format specification for printf_fp. */
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memset (&info, '\0', sizeof (info));
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/* The functions strfromd and strfromf pass a floating-point number with
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double precision to printf_fp, whereas strfroml passes a floating-point
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number with long double precision. The following line informs printf_fp
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which type of floating-point number is being passed. */
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info.is_long_double = __builtin_types_compatible_p (FLOAT, long double);
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/* Similarly, the function strfromf128 passes a floating-point number in
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_Float128 format to printf_fp. */
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#if __HAVE_DISTINCT_FLOAT128
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info.is_binary128 = __builtin_types_compatible_p (FLOAT, _Float128);
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#endif
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/* Set info according to the format string. */
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info.prec = precision;
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info.spec = specifier;
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if (info.spec != 'a' && info.spec != 'A')
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done = __printf_fp_l (&sfile.f._sbf._f, _NL_CURRENT_LOCALE, &info, &fpptr);
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else
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done = __printf_fphex (&sfile.f._sbf._f, &info, &fpptr);
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/* Terminate the string. */
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if (sfile.f._sbf._f._IO_buf_base != sfile.overflow_buf)
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*sfile.f._sbf._f._IO_write_ptr = '\0';
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return done;
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}
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