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glibc  2.9
Defines | Functions
printf-parsemb.c File Reference
#include <ctype.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include <wchar.h>
#include <wctype.h>
#include "printf-parse.h"
#include <assert.h>
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Go to the source code of this file.

Defines

#define CHAR_T   char
#define UCHAR_T   unsigned char
#define INT_T   int
#define L_(Str)   Str
#define ISDIGIT(Ch)   isdigit (Ch)
#define NDEBUG   1

Functions

size_t attribute_hidden __parse_one_specmb (const UCHAR_T *format, size_t posn, struct printf_spec *spec, size_t *max_ref_arg)

Define Documentation

#define CHAR_T   char

Definition at line 29 of file printf-parsemb.c.

#define INT_T   int

Definition at line 31 of file printf-parsemb.c.

#define ISDIGIT (   Ch)    isdigit (Ch)

Definition at line 33 of file printf-parsemb.c.

#define L_ (   Str)    Str

Definition at line 32 of file printf-parsemb.c.

#define NDEBUG   1

Definition at line 44 of file printf-parsemb.c.

#define UCHAR_T   unsigned char

Definition at line 30 of file printf-parsemb.c.


Function Documentation

size_t attribute_hidden __parse_one_specmb ( const UCHAR_T format,
size_t  posn,
struct printf_spec spec,
size_t max_ref_arg 
)

Definition at line 60 of file printf-parsemb.c.

{
  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_('$'))
       /* Is positional parameter.  */
       {
         ++format;          /* Skip the '$'.  */
         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_('$'))
           {
             spec->width_arg = n - 1;
             *max_ref_arg = MAX (*max_ref_arg, n);
             ++format;             /* Skip '$'.  */
           }
       }

      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))
    /* Constant width specification.  */
    spec->info.width = read_int (&format);

  /* 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_('$'))
              {
                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))
       spec->info.prec = read_int (&format);
      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;

  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++;
  if (__builtin_expect (__printf_function_table != NULL, 0)
      && 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.  */
    spec->ndata_args = (*__printf_arginfo_table[spec->info.spec])
      (&spec->info, 1, &spec->data_arg_type);
  else
    {
      /* 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;
}

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