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148 lines
4.4 KiB
C
148 lines
4.4 KiB
C
/* Internal header for parsing printf format strings.
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Copyright (C) 1995-2020 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 <printf.h>
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#include <stdint.h>
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#include <stddef.h>
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#include <string.h>
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#include <wchar.h>
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struct printf_spec
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{
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/* Information parsed from the format spec. */
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struct printf_info info;
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/* Pointers into the format string for the end of this format
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spec and the next (or to the end of the string if no more). */
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const UCHAR_T *end_of_fmt, *next_fmt;
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/* Position of arguments for precision and width, or -1 if `info' has
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the constant value. */
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int prec_arg, width_arg;
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int data_arg; /* Position of data argument. */
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int data_arg_type; /* Type of first argument. */
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/* Number of arguments consumed by this format specifier. */
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size_t ndata_args;
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/* Size of the parameter for PA_USER type. */
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int size;
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};
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/* The various kinds off arguments that can be passed to printf. */
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union printf_arg
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{
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wchar_t pa_wchar;
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int pa_int;
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long int pa_long_int;
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long long int pa_long_long_int;
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unsigned int pa_u_int;
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unsigned long int pa_u_long_int;
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unsigned long long int pa_u_long_long_int;
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double pa_double;
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long double pa_long_double;
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#if __HAVE_FLOAT128_UNLIKE_LDBL
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_Float128 pa_float128;
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#endif
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const char *pa_string;
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const wchar_t *pa_wstring;
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void *pa_pointer;
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void *pa_user;
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};
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#ifndef DONT_NEED_READ_INT
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/* Read a simple integer from a string and update the string pointer.
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It is assumed that the first character is a digit. */
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static int
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read_int (const UCHAR_T * *pstr)
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{
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int retval = **pstr - L_('0');
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while (ISDIGIT (*++(*pstr)))
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if (retval >= 0)
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{
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if (INT_MAX / 10 < retval)
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retval = -1;
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else
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{
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int digit = **pstr - L_('0');
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retval *= 10;
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if (INT_MAX - digit < retval)
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retval = -1;
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else
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retval += digit;
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}
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}
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return retval;
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}
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#endif
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/* These are defined in reg-printf.c. */
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extern printf_arginfo_size_function **__printf_arginfo_table attribute_hidden;
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extern printf_function **__printf_function_table attribute_hidden;
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extern printf_va_arg_function **__printf_va_arg_table attribute_hidden;
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/* Find the next spec in FORMAT, or the end of the string. Returns
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a pointer into FORMAT, to a '%' or a '\0'. */
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__extern_always_inline const unsigned char *
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__find_specmb (const unsigned char *format)
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{
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return (const unsigned char *) __strchrnul ((const char *) format, '%');
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}
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__extern_always_inline const unsigned int *
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__find_specwc (const unsigned int *format)
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{
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return (const unsigned int *) __wcschrnul ((const wchar_t *) format, L'%');
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}
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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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extern size_t __parse_one_specmb (const unsigned char *format, size_t posn,
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struct printf_spec *spec,
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size_t *max_ref_arg) attribute_hidden;
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extern size_t __parse_one_specwc (const unsigned int *format, size_t posn,
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struct printf_spec *spec,
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size_t *max_ref_arg) attribute_hidden;
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/* This variable is defined in reg-modifier.c. */
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struct printf_modifier_record;
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extern struct printf_modifier_record **__printf_modifier_table
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attribute_hidden;
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/* Handle registered modifiers. */
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extern int __handle_registered_modifier_mb (const unsigned char **format,
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struct printf_info *info)
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attribute_hidden;
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extern int __handle_registered_modifier_wc (const unsigned int **format,
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struct printf_info *info)
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attribute_hidden;
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