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411 lines
10 KiB
C
411 lines
10 KiB
C
/* Helper functions for parsing printf format strings.
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Copyright (C) 1995-2023 Free Software Foundation, Inc.
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This file is part of th 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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<https://www.gnu.org/licenses/>. */
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#include <ctype.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/param.h>
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#include <wchar.h>
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#include <wctype.h>
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#ifndef COMPILE_WPRINTF
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# define CHAR_T char
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# define UCHAR_T unsigned char
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# define INT_T int
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# define L_(Str) Str
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# define ISDIGIT(Ch) isdigit (Ch)
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# define HANDLE_REGISTERED_MODIFIER __handle_registered_modifier_mb
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#else
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# define CHAR_T wchar_t
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# define UCHAR_T unsigned int
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# define INT_T wint_t
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# define L_(Str) L##Str
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# define ISDIGIT(Ch) iswdigit (Ch)
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# define HANDLE_REGISTERED_MODIFIER __handle_registered_modifier_wc
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#endif
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#include "printf-parse.h"
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#define NDEBUG 1
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#include <assert.h>
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/* FORMAT must point to a '%' at the beginning of a spec. Fills in *SPEC
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with the parsed details. POSN is the number of arguments already
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consumed. At most MAXTYPES - POSN types are filled in TYPES. Return
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the number of args consumed by this spec; *MAX_REF_ARG is updated so it
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remains the highest argument index used. */
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size_t
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attribute_hidden
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#ifdef COMPILE_WPRINTF
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__parse_one_specwc (const UCHAR_T *format, size_t posn,
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struct printf_spec *spec, size_t *max_ref_arg)
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#else
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__parse_one_specmb (const UCHAR_T *format, size_t posn,
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struct printf_spec *spec, size_t *max_ref_arg)
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#endif
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{
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unsigned int n;
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size_t nargs = 0;
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/* Skip the '%'. */
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++format;
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/* Clear information structure. */
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spec->data_arg = -1;
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spec->info.alt = 0;
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spec->info.space = 0;
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spec->info.left = 0;
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spec->info.showsign = 0;
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spec->info.group = 0;
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spec->info.i18n = 0;
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spec->info.extra = 0;
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spec->info.pad = ' ';
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spec->info.wide = sizeof (UCHAR_T) > 1;
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spec->info.is_binary128 = 0;
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/* Test for positional argument. */
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if (ISDIGIT (*format))
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{
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const UCHAR_T *begin = format;
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n = read_int (&format);
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if (n != 0 && *format == L_('$'))
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/* Is positional parameter. */
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{
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++format; /* Skip the '$'. */
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if (n != -1)
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{
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spec->data_arg = n - 1;
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*max_ref_arg = MAX (*max_ref_arg, n);
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}
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}
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else
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/* Oops; that was actually the width and/or 0 padding flag.
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Step back and read it again. */
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format = begin;
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}
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/* Check for spec modifiers. */
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do
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{
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switch (*format)
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{
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case L_(' '):
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/* Output a space in place of a sign, when there is no sign. */
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spec->info.space = 1;
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continue;
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case L_('+'):
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/* Always output + or - for numbers. */
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spec->info.showsign = 1;
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continue;
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case L_('-'):
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/* Left-justify things. */
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spec->info.left = 1;
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continue;
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case L_('#'):
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/* Use the "alternate form":
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Hex has 0x or 0X, FP always has a decimal point. */
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spec->info.alt = 1;
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continue;
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case L_('0'):
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/* Pad with 0s. */
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spec->info.pad = '0';
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continue;
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case L_('\''):
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/* Show grouping in numbers if the locale information
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indicates any. */
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spec->info.group = 1;
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continue;
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case L_('I'):
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/* Use the internationalized form of the output. Currently
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means to use the `outdigits' of the current locale. */
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spec->info.i18n = 1;
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continue;
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default:
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break;
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}
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break;
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}
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while (*++format);
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if (spec->info.left)
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spec->info.pad = ' ';
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/* Get the field width. */
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spec->width_arg = -1;
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spec->info.width = 0;
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if (*format == L_('*'))
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{
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/* The field width is given in an argument.
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A negative field width indicates left justification. */
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const UCHAR_T *begin = ++format;
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if (ISDIGIT (*format))
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{
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/* The width argument might be found in a positional parameter. */
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n = read_int (&format);
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if (n != 0 && *format == L_('$'))
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{
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if (n != -1)
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{
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spec->width_arg = n - 1;
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*max_ref_arg = MAX (*max_ref_arg, n);
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}
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++format; /* Skip '$'. */
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}
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}
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if (spec->width_arg < 0)
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{
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/* Not in a positional parameter. Consume one argument. */
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spec->width_arg = posn++;
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++nargs;
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format = begin; /* Step back and reread. */
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}
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}
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else if (ISDIGIT (*format))
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{
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int n = read_int (&format);
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/* Constant width specification. */
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if (n != -1)
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spec->info.width = n;
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}
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/* Get the precision. */
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spec->prec_arg = -1;
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/* -1 means none given; 0 means explicit 0. */
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spec->info.prec = -1;
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if (*format == L_('.'))
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{
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++format;
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if (*format == L_('*'))
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{
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/* The precision is given in an argument. */
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const UCHAR_T *begin = ++format;
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if (ISDIGIT (*format))
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{
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n = read_int (&format);
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if (n != 0 && *format == L_('$'))
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{
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if (n != -1)
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{
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spec->prec_arg = n - 1;
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*max_ref_arg = MAX (*max_ref_arg, n);
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}
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++format;
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}
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}
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if (spec->prec_arg < 0)
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{
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/* Not in a positional parameter. */
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spec->prec_arg = posn++;
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++nargs;
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format = begin;
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}
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}
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else if (ISDIGIT (*format))
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{
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int n = read_int (&format);
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if (n != -1)
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spec->info.prec = n;
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}
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else
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/* "%.?" is treated like "%.0?". */
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spec->info.prec = 0;
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}
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/* Check for type modifiers. */
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spec->info.is_long_double = 0;
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spec->info.is_short = 0;
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spec->info.is_long = 0;
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spec->info.is_char = 0;
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spec->info.user = 0;
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if (__builtin_expect (__printf_modifier_table == NULL, 1)
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|| __printf_modifier_table[*format] == NULL
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|| HANDLE_REGISTERED_MODIFIER (&format, &spec->info) != 0)
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switch (*format++)
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{
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case L_('h'):
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/* ints are short ints or chars. */
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if (*format != L_('h'))
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spec->info.is_short = 1;
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else
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{
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++format;
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spec->info.is_char = 1;
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}
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break;
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case L_('l'):
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/* ints are long ints. */
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spec->info.is_long = 1;
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if (*format != L_('l'))
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break;
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++format;
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/* FALLTHROUGH */
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case L_('L'):
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/* doubles are long doubles, and ints are long long ints. */
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case L_('q'):
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/* 4.4 uses this for long long. */
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spec->info.is_long_double = 1;
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break;
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case L_('z'):
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case L_('Z'):
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/* ints are size_ts. */
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assert (sizeof (size_t) <= sizeof (unsigned long long int));
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#if LONG_MAX != LONG_LONG_MAX
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spec->info.is_long_double = (sizeof (size_t)
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> sizeof (unsigned long int));
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#endif
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spec->info.is_long = sizeof (size_t) > sizeof (unsigned int);
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break;
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case L_('t'):
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assert (sizeof (ptrdiff_t) <= sizeof (long long int));
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#if LONG_MAX != LONG_LONG_MAX
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spec->info.is_long_double = (sizeof (ptrdiff_t) > sizeof (long int));
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#endif
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spec->info.is_long = sizeof (ptrdiff_t) > sizeof (int);
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break;
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case L_('j'):
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assert (sizeof (uintmax_t) <= sizeof (unsigned long long int));
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#if LONG_MAX != LONG_LONG_MAX
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spec->info.is_long_double = (sizeof (uintmax_t)
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> sizeof (unsigned long int));
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#endif
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spec->info.is_long = sizeof (uintmax_t) > sizeof (unsigned int);
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break;
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default:
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/* Not a recognized modifier. Backup. */
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--format;
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break;
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}
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/* Get the format specification. */
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spec->info.spec = (wchar_t) *format++;
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spec->size = -1;
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if (__builtin_expect (__printf_function_table == NULL, 1)
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|| spec->info.spec > UCHAR_MAX
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|| __printf_arginfo_table[spec->info.spec] == NULL
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/* We don't try to get the types for all arguments if the format
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uses more than one. The normal case is covered though. If
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the call returns -1 we continue with the normal specifiers. */
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|| (int) (spec->ndata_args = (*__printf_arginfo_table[spec->info.spec])
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(&spec->info, 1, &spec->data_arg_type,
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&spec->size)) < 0)
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{
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/* Find the data argument types of a built-in spec. */
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spec->ndata_args = 1;
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switch (spec->info.spec)
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{
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case L'i':
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case L'd':
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case L'u':
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case L'o':
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case L'X':
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case L'x':
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case L'B':
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case L'b':
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#if LONG_MAX != LONG_LONG_MAX
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if (spec->info.is_long_double)
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spec->data_arg_type = PA_INT|PA_FLAG_LONG_LONG;
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else
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#endif
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if (spec->info.is_long)
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spec->data_arg_type = PA_INT|PA_FLAG_LONG;
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else if (spec->info.is_short)
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spec->data_arg_type = PA_INT|PA_FLAG_SHORT;
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else if (spec->info.is_char)
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spec->data_arg_type = PA_CHAR;
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else
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spec->data_arg_type = PA_INT;
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break;
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case L'e':
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case L'E':
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case L'f':
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case L'F':
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case L'g':
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case L'G':
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case L'a':
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case L'A':
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if (spec->info.is_long_double)
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spec->data_arg_type = PA_DOUBLE|PA_FLAG_LONG_DOUBLE;
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else
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spec->data_arg_type = PA_DOUBLE;
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break;
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case L'c':
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spec->data_arg_type = PA_CHAR;
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break;
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case L'C':
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spec->data_arg_type = PA_WCHAR;
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break;
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case L's':
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spec->data_arg_type = PA_STRING;
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break;
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case L'S':
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spec->data_arg_type = PA_WSTRING;
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break;
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case L'p':
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spec->data_arg_type = PA_POINTER;
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break;
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case L'n':
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spec->data_arg_type = PA_INT|PA_FLAG_PTR;
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break;
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case L'm':
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default:
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/* An unknown spec will consume no args. */
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spec->ndata_args = 0;
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break;
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}
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}
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if (spec->data_arg == -1 && spec->ndata_args > 0)
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{
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/* There are args consumed, but no positional spec. Use the
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next sequential arg position. */
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spec->data_arg = posn;
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nargs += spec->ndata_args;
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}
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if (spec->info.spec == L'\0')
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/* Format ended before this spec was complete. */
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spec->end_of_fmt = spec->next_fmt = format - 1;
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else
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{
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/* Find the next format spec. */
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spec->end_of_fmt = format;
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#ifdef COMPILE_WPRINTF
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spec->next_fmt = __find_specwc (format);
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#else
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spec->next_fmt = __find_specmb (format);
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#endif
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}
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return nargs;
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}
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