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/* Internal header for parsing printf format strings.
Copyright (C) 1995-2024 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
<https://www.gnu.org/licenses/>. */
#include <printf.h>
#include <stdint.h>
#include <stddef.h>
#include <string.h>
#include <wchar.h>
struct printf_spec
{
/* Information parsed from the format spec. */
struct printf_info info;
/* Pointers into the format string for the end of this format
spec and the next (or to the end of the string if no more). */
const UCHAR_T *end_of_fmt, *next_fmt;
/* Position of arguments for precision and width, or -1 if `info' has
the constant value. */
int prec_arg, width_arg;
int data_arg; /* Position of data argument. */
int data_arg_type; /* Type of first argument. */
/* Number of arguments consumed by this format specifier. */
size_t ndata_args;
/* Size of the parameter for PA_USER type. */
int size;
};
#ifndef DONT_NEED_READ_INT
/* Read a simple integer from a string and update the string pointer.
It is assumed that the first character is a digit. */
static int
read_int (const UCHAR_T * *pstr)
{
int retval = **pstr - L_('0');
while (ISDIGIT (*++(*pstr)))
if (retval >= 0)
{
if (INT_MAX / 10 < retval)
retval = -1;
else
{
int digit = **pstr - L_('0');
retval *= 10;
if (INT_MAX - digit < retval)
retval = -1;
else
retval += digit;
}
}
return retval;
}
#endif
/* Find the next spec in FORMAT, or the end of the string. Returns
a pointer into FORMAT, to a '%' or a '\0'. */
__extern_always_inline const unsigned char *
__find_specmb (const unsigned char *format)
{
return (const unsigned char *) __strchrnul ((const char *) format, '%');
}
__extern_always_inline const unsigned int *
__find_specwc (const unsigned int *format)
{
return (const unsigned int *) __wcschrnul ((const wchar_t *) format, L'%');
}
/* 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. *FAILED is set to indicate
whether parsing failed and printf should return with an error status. */
extern size_t __parse_one_specmb (const unsigned char *format, size_t posn,
struct printf_spec *spec,
size_t *max_ref_arg,
bool *failed) attribute_hidden;
extern size_t __parse_one_specwc (const unsigned int *format, size_t posn,
struct printf_spec *spec,
size_t *max_ref_arg,
bool *failed) attribute_hidden;
/* This variable is defined in reg-modifier.c. */
struct printf_modifier_record;
extern struct printf_modifier_record **__printf_modifier_table
attribute_hidden;
/* Handle registered modifiers. */
extern int __handle_registered_modifier_mb (const unsigned char **format,
struct printf_info *info)
attribute_hidden;
extern int __handle_registered_modifier_wc (const unsigned int **format,
struct printf_info *info)
attribute_hidden;
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