mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-28 23:34:53 +03:00
408 lines
10 KiB
C
408 lines
10 KiB
C
/* Helper functions for parsing printf format strings.
|
|
Copyright (C) 1995-2014 Free Software Foundation, Inc.
|
|
This file is part of th GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <ctype.h>
|
|
#include <limits.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/param.h>
|
|
#include <wchar.h>
|
|
#include <wctype.h>
|
|
|
|
#ifndef COMPILE_WPRINTF
|
|
# define CHAR_T char
|
|
# define UCHAR_T unsigned char
|
|
# define INT_T int
|
|
# define L_(Str) Str
|
|
# define ISDIGIT(Ch) isdigit (Ch)
|
|
# define HANDLE_REGISTERED_MODIFIER __handle_registered_modifier_mb
|
|
#else
|
|
# define CHAR_T wchar_t
|
|
# define UCHAR_T unsigned int
|
|
# define INT_T wint_t
|
|
# define L_(Str) L##Str
|
|
# define ISDIGIT(Ch) iswdigit (Ch)
|
|
# define HANDLE_REGISTERED_MODIFIER __handle_registered_modifier_wc
|
|
#endif
|
|
|
|
#include "printf-parse.h"
|
|
|
|
#define NDEBUG 1
|
|
#include <assert.h>
|
|
|
|
|
|
|
|
/* FORMAT must point to a '%' at the beginning of a spec. Fills in *SPEC
|
|
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. */
|
|
size_t
|
|
attribute_hidden
|
|
#ifdef COMPILE_WPRINTF
|
|
__parse_one_specwc (const UCHAR_T *format, size_t posn,
|
|
struct printf_spec *spec, size_t *max_ref_arg)
|
|
#else
|
|
__parse_one_specmb (const UCHAR_T *format, size_t posn,
|
|
struct printf_spec *spec, size_t *max_ref_arg)
|
|
#endif
|
|
{
|
|
unsigned int n;
|
|
size_t nargs = 0;
|
|
|
|
/* Skip the '%'. */
|
|
++format;
|
|
|
|
/* Clear information structure. */
|
|
spec->data_arg = -1;
|
|
spec->info.alt = 0;
|
|
spec->info.space = 0;
|
|
spec->info.left = 0;
|
|
spec->info.showsign = 0;
|
|
spec->info.group = 0;
|
|
spec->info.i18n = 0;
|
|
spec->info.extra = 0;
|
|
spec->info.pad = ' ';
|
|
spec->info.wide = sizeof (UCHAR_T) > 1;
|
|
|
|
/* Test for positional argument. */
|
|
if (ISDIGIT (*format))
|
|
{
|
|
const UCHAR_T *begin = format;
|
|
|
|
n = read_int (&format);
|
|
|
|
if (n != 0 && *format == L_('$'))
|
|
/* Is positional parameter. */
|
|
{
|
|
++format; /* Skip the '$'. */
|
|
if (n != -1)
|
|
{
|
|
spec->data_arg = n - 1;
|
|
*max_ref_arg = MAX (*max_ref_arg, n);
|
|
}
|
|
}
|
|
else
|
|
/* Oops; that was actually the width and/or 0 padding flag.
|
|
Step back and read it again. */
|
|
format = begin;
|
|
}
|
|
|
|
/* Check for spec modifiers. */
|
|
do
|
|
{
|
|
switch (*format)
|
|
{
|
|
case L_(' '):
|
|
/* Output a space in place of a sign, when there is no sign. */
|
|
spec->info.space = 1;
|
|
continue;
|
|
case L_('+'):
|
|
/* Always output + or - for numbers. */
|
|
spec->info.showsign = 1;
|
|
continue;
|
|
case L_('-'):
|
|
/* Left-justify things. */
|
|
spec->info.left = 1;
|
|
continue;
|
|
case L_('#'):
|
|
/* Use the "alternate form":
|
|
Hex has 0x or 0X, FP always has a decimal point. */
|
|
spec->info.alt = 1;
|
|
continue;
|
|
case L_('0'):
|
|
/* Pad with 0s. */
|
|
spec->info.pad = '0';
|
|
continue;
|
|
case L_('\''):
|
|
/* Show grouping in numbers if the locale information
|
|
indicates any. */
|
|
spec->info.group = 1;
|
|
continue;
|
|
case L_('I'):
|
|
/* Use the internationalized form of the output. Currently
|
|
means to use the `outdigits' of the current locale. */
|
|
spec->info.i18n = 1;
|
|
continue;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
while (*++format);
|
|
|
|
if (spec->info.left)
|
|
spec->info.pad = ' ';
|
|
|
|
/* Get the field width. */
|
|
spec->width_arg = -1;
|
|
spec->info.width = 0;
|
|
if (*format == L_('*'))
|
|
{
|
|
/* The field width is given in an argument.
|
|
A negative field width indicates left justification. */
|
|
const UCHAR_T *begin = ++format;
|
|
|
|
if (ISDIGIT (*format))
|
|
{
|
|
/* The width argument might be found in a positional parameter. */
|
|
n = read_int (&format);
|
|
|
|
if (n != 0 && *format == L_('$'))
|
|
{
|
|
if (n != -1)
|
|
{
|
|
spec->width_arg = n - 1;
|
|
*max_ref_arg = MAX (*max_ref_arg, n);
|
|
}
|
|
++format; /* Skip '$'. */
|
|
}
|
|
}
|
|
|
|
if (spec->width_arg < 0)
|
|
{
|
|
/* Not in a positional parameter. Consume one argument. */
|
|
spec->width_arg = posn++;
|
|
++nargs;
|
|
format = begin; /* Step back and reread. */
|
|
}
|
|
}
|
|
else if (ISDIGIT (*format))
|
|
{
|
|
int n = read_int (&format);
|
|
|
|
/* Constant width specification. */
|
|
if (n != -1)
|
|
spec->info.width = n;
|
|
}
|
|
/* Get the precision. */
|
|
spec->prec_arg = -1;
|
|
/* -1 means none given; 0 means explicit 0. */
|
|
spec->info.prec = -1;
|
|
if (*format == L_('.'))
|
|
{
|
|
++format;
|
|
if (*format == L_('*'))
|
|
{
|
|
/* The precision is given in an argument. */
|
|
const UCHAR_T *begin = ++format;
|
|
|
|
if (ISDIGIT (*format))
|
|
{
|
|
n = read_int (&format);
|
|
|
|
if (n != 0 && *format == L_('$'))
|
|
{
|
|
if (n != -1)
|
|
{
|
|
spec->prec_arg = n - 1;
|
|
*max_ref_arg = MAX (*max_ref_arg, n);
|
|
}
|
|
++format;
|
|
}
|
|
}
|
|
|
|
if (spec->prec_arg < 0)
|
|
{
|
|
/* Not in a positional parameter. */
|
|
spec->prec_arg = posn++;
|
|
++nargs;
|
|
format = begin;
|
|
}
|
|
}
|
|
else if (ISDIGIT (*format))
|
|
{
|
|
int n = read_int (&format);
|
|
|
|
if (n != -1)
|
|
spec->info.prec = n;
|
|
}
|
|
else
|
|
/* "%.?" is treated like "%.0?". */
|
|
spec->info.prec = 0;
|
|
}
|
|
|
|
/* Check for type modifiers. */
|
|
spec->info.is_long_double = 0;
|
|
spec->info.is_short = 0;
|
|
spec->info.is_long = 0;
|
|
spec->info.is_char = 0;
|
|
spec->info.user = 0;
|
|
|
|
if (__builtin_expect (__printf_modifier_table == NULL, 1)
|
|
|| __printf_modifier_table[*format] == NULL
|
|
|| HANDLE_REGISTERED_MODIFIER (&format, &spec->info) != 0)
|
|
switch (*format++)
|
|
{
|
|
case L_('h'):
|
|
/* ints are short ints or chars. */
|
|
if (*format != L_('h'))
|
|
spec->info.is_short = 1;
|
|
else
|
|
{
|
|
++format;
|
|
spec->info.is_char = 1;
|
|
}
|
|
break;
|
|
case L_('l'):
|
|
/* ints are long ints. */
|
|
spec->info.is_long = 1;
|
|
if (*format != L_('l'))
|
|
break;
|
|
++format;
|
|
/* FALLTHROUGH */
|
|
case L_('L'):
|
|
/* doubles are long doubles, and ints are long long ints. */
|
|
case L_('q'):
|
|
/* 4.4 uses this for long long. */
|
|
spec->info.is_long_double = 1;
|
|
break;
|
|
case L_('z'):
|
|
case L_('Z'):
|
|
/* ints are size_ts. */
|
|
assert (sizeof (size_t) <= sizeof (unsigned long long int));
|
|
#if LONG_MAX != LONG_LONG_MAX
|
|
spec->info.is_long_double = (sizeof (size_t)
|
|
> sizeof (unsigned long int));
|
|
#endif
|
|
spec->info.is_long = sizeof (size_t) > sizeof (unsigned int);
|
|
break;
|
|
case L_('t'):
|
|
assert (sizeof (ptrdiff_t) <= sizeof (long long int));
|
|
#if LONG_MAX != LONG_LONG_MAX
|
|
spec->info.is_long_double = (sizeof (ptrdiff_t) > sizeof (long int));
|
|
#endif
|
|
spec->info.is_long = sizeof (ptrdiff_t) > sizeof (int);
|
|
break;
|
|
case L_('j'):
|
|
assert (sizeof (uintmax_t) <= sizeof (unsigned long long int));
|
|
#if LONG_MAX != LONG_LONG_MAX
|
|
spec->info.is_long_double = (sizeof (uintmax_t)
|
|
> sizeof (unsigned long int));
|
|
#endif
|
|
spec->info.is_long = sizeof (uintmax_t) > sizeof (unsigned int);
|
|
break;
|
|
default:
|
|
/* Not a recognized modifier. Backup. */
|
|
--format;
|
|
break;
|
|
}
|
|
|
|
/* Get the format specification. */
|
|
spec->info.spec = (wchar_t) *format++;
|
|
spec->size = -1;
|
|
if (__builtin_expect (__printf_function_table == NULL, 1)
|
|
|| spec->info.spec > UCHAR_MAX
|
|
|| __printf_arginfo_table[spec->info.spec] == NULL
|
|
/* We don't try to get the types for all arguments if the format
|
|
uses more than one. The normal case is covered though. If
|
|
the call returns -1 we continue with the normal specifiers. */
|
|
|| (int) (spec->ndata_args = (*__printf_arginfo_table[spec->info.spec])
|
|
(&spec->info, 1, &spec->data_arg_type,
|
|
&spec->size)) < 0)
|
|
{
|
|
/* Find the data argument types of a built-in spec. */
|
|
spec->ndata_args = 1;
|
|
|
|
switch (spec->info.spec)
|
|
{
|
|
case L'i':
|
|
case L'd':
|
|
case L'u':
|
|
case L'o':
|
|
case L'X':
|
|
case L'x':
|
|
#if LONG_MAX != LONG_LONG_MAX
|
|
if (spec->info.is_long_double)
|
|
spec->data_arg_type = PA_INT|PA_FLAG_LONG_LONG;
|
|
else
|
|
#endif
|
|
if (spec->info.is_long)
|
|
spec->data_arg_type = PA_INT|PA_FLAG_LONG;
|
|
else if (spec->info.is_short)
|
|
spec->data_arg_type = PA_INT|PA_FLAG_SHORT;
|
|
else if (spec->info.is_char)
|
|
spec->data_arg_type = PA_CHAR;
|
|
else
|
|
spec->data_arg_type = PA_INT;
|
|
break;
|
|
case L'e':
|
|
case L'E':
|
|
case L'f':
|
|
case L'F':
|
|
case L'g':
|
|
case L'G':
|
|
case L'a':
|
|
case L'A':
|
|
if (spec->info.is_long_double)
|
|
spec->data_arg_type = PA_DOUBLE|PA_FLAG_LONG_DOUBLE;
|
|
else
|
|
spec->data_arg_type = PA_DOUBLE;
|
|
break;
|
|
case L'c':
|
|
spec->data_arg_type = PA_CHAR;
|
|
break;
|
|
case L'C':
|
|
spec->data_arg_type = PA_WCHAR;
|
|
break;
|
|
case L's':
|
|
spec->data_arg_type = PA_STRING;
|
|
break;
|
|
case L'S':
|
|
spec->data_arg_type = PA_WSTRING;
|
|
break;
|
|
case L'p':
|
|
spec->data_arg_type = PA_POINTER;
|
|
break;
|
|
case L'n':
|
|
spec->data_arg_type = PA_INT|PA_FLAG_PTR;
|
|
break;
|
|
|
|
case L'm':
|
|
default:
|
|
/* An unknown spec will consume no args. */
|
|
spec->ndata_args = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (spec->data_arg == -1 && spec->ndata_args > 0)
|
|
{
|
|
/* There are args consumed, but no positional spec. Use the
|
|
next sequential arg position. */
|
|
spec->data_arg = posn;
|
|
nargs += spec->ndata_args;
|
|
}
|
|
|
|
if (spec->info.spec == L'\0')
|
|
/* Format ended before this spec was complete. */
|
|
spec->end_of_fmt = spec->next_fmt = format - 1;
|
|
else
|
|
{
|
|
/* Find the next format spec. */
|
|
spec->end_of_fmt = format;
|
|
#ifdef COMPILE_WPRINTF
|
|
spec->next_fmt = __find_specwc (format);
|
|
#else
|
|
spec->next_fmt = __find_specmb (format);
|
|
#endif
|
|
}
|
|
|
|
return nargs;
|
|
}
|