text: /* Helper functions for parsing printf format strings.
     Copyright (C) 1995-2016 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;
  }
  