455 lines
11 KiB
C
455 lines
11 KiB
C
/* Internal header for parsing printf format strings.
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Copyright (C) 1995-1999, 2000 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <ctype.h>
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#include <limits.h>
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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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#define NDEBUG 1
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#include <assert.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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};
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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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unsigned char pa_char;
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wchar_t pa_wchar;
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short int pa_short_int;
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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 short int pa_u_short_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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float pa_float;
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double pa_double;
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long double pa_long_double;
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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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};
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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 inline unsigned int
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read_int (const UCHAR_T * *pstr)
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{
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unsigned int retval = **pstr - L_('0');
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while (ISDIGIT (*++(*pstr)))
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{
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retval *= 10;
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retval += **pstr - L_('0');
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}
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return retval;
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}
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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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static inline const UCHAR_T *
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#ifdef COMPILE_WPRINTF
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find_spec (const UCHAR_T *format)
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#else
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find_spec (const UCHAR_T *format, mbstate_t *ps)
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#endif
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{
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#ifdef COMPILE_WPRINTF
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return (const UCHAR_T *) __wcschrnul ((const CHAR_T *) format, L'%');
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#else
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while (*format != L_('\0') && *format != L_('%'))
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{
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int len;
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/* Remove any hints of a wrong encoding. */
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ps->__count = 0;
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if (! isascii (*format) && (len = __mbrlen (format, MB_CUR_MAX, ps)) > 0)
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format += len;
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else
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++format;
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}
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return format;
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#endif
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}
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/* These are defined in reg-printf.c. */
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extern printf_arginfo_function *__printf_arginfo_table[];
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extern printf_function **__printf_function_table;
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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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static inline size_t
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#ifdef COMPILE_WPRINTF
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parse_one_spec (const UCHAR_T *format, size_t posn, struct printf_spec *spec,
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size_t *max_ref_arg)
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#else
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parse_one_spec (const UCHAR_T *format, size_t posn, struct printf_spec *spec,
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size_t *max_ref_arg, mbstate_t *ps)
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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.pad = ' ';
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spec->info.wide = sizeof (UCHAR_T) > 1;
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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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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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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_('$'))
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{
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spec->width_arg = n - 1;
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*max_ref_arg = MAX (*max_ref_arg, n);
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++format; /* Skip '$'. */
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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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/* Constant width specification. */
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spec->info.width = read_int (&format);
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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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spec->prec_arg = n - 1;
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*max_ref_arg = MAX (*max_ref_arg, n);
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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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spec->info.prec = read_int (&format);
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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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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) > 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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if (__printf_function_table != NULL
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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. */
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spec->ndata_args = (*__printf_arginfo_table[spec->info.spec])
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(&spec->info, 1, &spec->data_arg_type);
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else
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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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#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_spec (format);
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#else
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spec->next_fmt = find_spec (format, ps);
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#endif
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}
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return nargs;
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}
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