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printf-parse.c

/* Formatted output to strings.
   Copyright (C) 1999-2000, 2002-2003 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU Library General Public License as published
   by the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
   USA.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

/* Specification.  */
#if WIDE_CHAR_VERSION
# include "wprintf-parse.h"
#else
# include "printf-parse.h"
#endif

/* Get size_t, NULL.  */
#include <stddef.h>

/* Get intmax_t.  */
#if HAVE_STDINT_H_WITH_UINTMAX
# include <stdint.h>
#endif
#if HAVE_INTTYPES_H_WITH_UINTMAX
# include <inttypes.h>
#endif

/* malloc(), realloc(), free().  */
#include <stdlib.h>

/* Checked size_t computations.  */
#include "xsize.h"

#if WIDE_CHAR_VERSION
# define PRINTF_PARSE wprintf_parse
# define CHAR_T wchar_t
# define DIRECTIVE wchar_t_directive
# define DIRECTIVES wchar_t_directives
#else
# define PRINTF_PARSE printf_parse
# define CHAR_T char
# define DIRECTIVE char_directive
# define DIRECTIVES char_directives
#endif

#ifdef STATIC
STATIC
#endif
int
PRINTF_PARSE (const CHAR_T *format, DIRECTIVES *d, arguments *a)
{
  const CHAR_T *cp = format;        /* pointer into format */
  size_t arg_posn = 0;        /* number of regular arguments consumed */
  size_t d_allocated;               /* allocated elements of d->dir */
  size_t a_allocated;               /* allocated elements of a->arg */
  size_t max_width_length = 0;
  size_t max_precision_length = 0;

  d->count = 0;
  d_allocated = 1;
  d->dir = malloc (d_allocated * sizeof (DIRECTIVE));
  if (d->dir == NULL)
    /* Out of memory.  */
    return -1;

  a->count = 0;
  a_allocated = 0;
  a->arg = NULL;

#define REGISTER_ARG(_index_,_type_) \
  {                                                   \
    size_t n = (_index_);                                   \
    if (n >= a_allocated)                                   \
      {                                                     \
      size_t memory_size;                                   \
      argument *memory;                               \
                                                      \
      a_allocated = xtimes (a_allocated, 2);                      \
      if (a_allocated <= n)                                 \
        a_allocated = xsum (n, 1);                          \
      memory_size = xtimes (a_allocated, sizeof (argument));            \
      if (size_overflow_p (memory_size))                    \
        /* Overflow, would lead to out of memory.  */             \
        goto error;                                         \
      memory = (a->arg                                \
              ? realloc (a->arg, memory_size)               \
              : malloc (memory_size));                      \
      if (memory == NULL)                                   \
        /* Out of memory.  */                               \
        goto error;                                         \
      a->arg = memory;                                \
      }                                                     \
    while (a->count <= n)                                   \
      a->arg[a->count++].type = TYPE_NONE;                        \
    if (a->arg[n].type == TYPE_NONE)                              \
      a->arg[n].type = (_type_);                            \
    else if (a->arg[n].type != (_type_))                    \
      /* Ambiguous type for positional argument.  */              \
      goto error;                                     \
  }

  while (*cp != '\0')
    {
      CHAR_T c = *cp++;
      if (c == '%')
      {
        size_t arg_index = ARG_NONE;
        DIRECTIVE *dp = &d->dir[d->count];/* pointer to next directive */

        /* Initialize the next directive.  */
        dp->dir_start = cp - 1;
        dp->flags = 0;
        dp->width_start = NULL;
        dp->width_end = NULL;
        dp->width_arg_index = ARG_NONE;
        dp->precision_start = NULL;
        dp->precision_end = NULL;
        dp->precision_arg_index = ARG_NONE;
        dp->arg_index = ARG_NONE;

        /* Test for positional argument.  */
        if (*cp >= '0' && *cp <= '9')
          {
            const CHAR_T *np;

            for (np = cp; *np >= '0' && *np <= '9'; np++)
            ;
            if (*np == '$')
            {
              size_t n = 0;

              for (np = cp; *np >= '0' && *np <= '9'; np++)
                n = xsum (xtimes (n, 10), *np - '0');
              if (n == 0)
                /* Positional argument 0.  */
                goto error;
              if (size_overflow_p (n))
                /* n too large, would lead to out of memory later.  */
                goto error;
              arg_index = n - 1;
              cp = np + 1;
            }
          }

        /* Read the flags.  */
        for (;;)
          {
            if (*cp == '\'')
            {
              dp->flags |= FLAG_GROUP;
              cp++;
            }
            else if (*cp == '-')
            {
              dp->flags |= FLAG_LEFT;
              cp++;
            }
            else if (*cp == '+')
            {
              dp->flags |= FLAG_SHOWSIGN;
              cp++;
            }
            else if (*cp == ' ')
            {
              dp->flags |= FLAG_SPACE;
              cp++;
            }
            else if (*cp == '#')
            {
              dp->flags |= FLAG_ALT;
              cp++;
            }
            else if (*cp == '0')
            {
              dp->flags |= FLAG_ZERO;
              cp++;
            }
            else
            break;
          }

        /* Parse the field width.  */
        if (*cp == '*')
          {
            dp->width_start = cp;
            cp++;
            dp->width_end = cp;
            if (max_width_length < 1)
            max_width_length = 1;

            /* Test for positional argument.  */
            if (*cp >= '0' && *cp <= '9')
            {
              const CHAR_T *np;

              for (np = cp; *np >= '0' && *np <= '9'; np++)
                ;
              if (*np == '$')
                {
                  size_t n = 0;

                  for (np = cp; *np >= '0' && *np <= '9'; np++)
                  n = xsum (xtimes (n, 10), *np - '0');
                  if (n == 0)
                  /* Positional argument 0.  */
                  goto error;
                  if (size_overflow_p (n))
                  /* n too large, would lead to out of memory later.  */
                  goto error;
                  dp->width_arg_index = n - 1;
                  cp = np + 1;
                }
            }
            if (dp->width_arg_index == ARG_NONE)
            {
              dp->width_arg_index = arg_posn++;
              if (dp->width_arg_index == ARG_NONE)
                /* arg_posn wrapped around.  */
                goto error;
            }
            REGISTER_ARG (dp->width_arg_index, TYPE_INT);
          }
        else if (*cp >= '0' && *cp <= '9')
          {
            size_t width_length;

            dp->width_start = cp;
            for (; *cp >= '0' && *cp <= '9'; cp++)
            ;
            dp->width_end = cp;
            width_length = dp->width_end - dp->width_start;
            if (max_width_length < width_length)
            max_width_length = width_length;
          }

        /* Parse the precision.  */
        if (*cp == '.')
          {
            cp++;
            if (*cp == '*')
            {
              dp->precision_start = cp - 1;
              cp++;
              dp->precision_end = cp;
              if (max_precision_length < 2)
                max_precision_length = 2;

              /* Test for positional argument.  */
              if (*cp >= '0' && *cp <= '9')
                {
                  const CHAR_T *np;

                  for (np = cp; *np >= '0' && *np <= '9'; np++)
                  ;
                  if (*np == '$')
                  {
                    size_t n = 0;

                    for (np = cp; *np >= '0' && *np <= '9'; np++)
                      n = xsum (xtimes (n, 10), *np - '0');
                    if (n == 0)
                      /* Positional argument 0.  */
                      goto error;
                    if (size_overflow_p (n))
                      /* n too large, would lead to out of memory
                         later.  */
                      goto error;
                    dp->precision_arg_index = n - 1;
                    cp = np + 1;
                  }
                }
              if (dp->precision_arg_index == ARG_NONE)
                {
                  dp->precision_arg_index = arg_posn++;
                  if (dp->precision_arg_index == ARG_NONE)
                  /* arg_posn wrapped around.  */
                  goto error;
                }
              REGISTER_ARG (dp->precision_arg_index, TYPE_INT);
            }
            else
            {
              size_t precision_length;

              dp->precision_start = cp - 1;
              for (; *cp >= '0' && *cp <= '9'; cp++)
                ;
              dp->precision_end = cp;
              precision_length = dp->precision_end - dp->precision_start;
              if (max_precision_length < precision_length)
                max_precision_length = precision_length;
            }
          }

        {
          arg_type type;

          /* Parse argument type/size specifiers.  */
          {
            int flags = 0;

            for (;;)
            {
              if (*cp == 'h')
                {
                  flags |= (1 << (flags & 1));
                  cp++;
                }
              else if (*cp == 'L')
                {
                  flags |= 4;
                  cp++;
                }
              else if (*cp == 'l')
                {
                  flags += 8;
                  cp++;
                }
#ifdef HAVE_INTMAX_T
              else if (*cp == 'j')
                {
                  if (sizeof (intmax_t) > sizeof (long))
                  {
                    /* intmax_t = long long */
                    flags += 16;
                  }
                  else if (sizeof (intmax_t) > sizeof (int))
                  {
                    /* intmax_t = long */
                    flags += 8;
                  }
                  cp++;
                }
#endif
              else if (*cp == 'z' || *cp == 'Z')
                {
                  /* 'z' is standardized in ISO C 99, but glibc uses 'Z'
                   because the warning facility in gcc-2.95.2 understands
                   only 'Z' (see gcc-2.95.2/gcc/c-common.c:1784).  */
                  if (sizeof (size_t) > sizeof (long))
                  {
                    /* size_t = long long */
                    flags += 16;
                  }
                  else if (sizeof (size_t) > sizeof (int))
                  {
                    /* size_t = long */
                    flags += 8;
                  }
                  cp++;
                }
              else if (*cp == 't')
                {
                  if (sizeof (ptrdiff_t) > sizeof (long))
                  {
                    /* ptrdiff_t = long long */
                    flags += 16;
                  }
                  else if (sizeof (ptrdiff_t) > sizeof (int))
                  {
                    /* ptrdiff_t = long */
                    flags += 8;
                  }
                  cp++;
                }
              else
                break;
            }

            /* Read the conversion character.  */
            c = *cp++;
            switch (c)
            {
            case 'd': case 'i':
#ifdef HAVE_LONG_LONG
              if (flags >= 16 || (flags & 4))
                type = TYPE_LONGLONGINT;
              else
#endif
              if (flags >= 8)
                type = TYPE_LONGINT;
              else if (flags & 2)
                type = TYPE_SCHAR;
              else if (flags & 1)
                type = TYPE_SHORT;
              else
                type = TYPE_INT;
              break;
            case 'o': case 'u': case 'x': case 'X':
#ifdef HAVE_LONG_LONG
              if (flags >= 16 || (flags & 4))
                type = TYPE_ULONGLONGINT;
              else
#endif
              if (flags >= 8)
                type = TYPE_ULONGINT;
              else if (flags & 2)
                type = TYPE_UCHAR;
              else if (flags & 1)
                type = TYPE_USHORT;
              else
                type = TYPE_UINT;
              break;
            case 'f': case 'F': case 'e': case 'E': case 'g': case 'G':
            case 'a': case 'A':
#ifdef HAVE_LONG_DOUBLE
              if (flags >= 16 || (flags & 4))
                type = TYPE_LONGDOUBLE;
              else
#endif
              type = TYPE_DOUBLE;
              break;
            case 'c':
              if (flags >= 8)
#ifdef HAVE_WINT_T
                type = TYPE_WIDE_CHAR;
#else
                goto error;
#endif
              else
                type = TYPE_CHAR;
              break;
#ifdef HAVE_WINT_T
            case 'C':
              type = TYPE_WIDE_CHAR;
              c = 'c';
              break;
#endif
            case 's':
              if (flags >= 8)
#ifdef HAVE_WCHAR_T
                type = TYPE_WIDE_STRING;
#else
                goto error;
#endif
              else
                type = TYPE_STRING;
              break;
#ifdef HAVE_WCHAR_T
            case 'S':
              type = TYPE_WIDE_STRING;
              c = 's';
              break;
#endif
            case 'p':
              type = TYPE_POINTER;
              break;
            case 'n':
#ifdef HAVE_LONG_LONG
              if (flags >= 16 || (flags & 4))
                type = TYPE_COUNT_LONGLONGINT_POINTER;
              else
#endif
              if (flags >= 8)
                type = TYPE_COUNT_LONGINT_POINTER;
              else if (flags & 2)
                type = TYPE_COUNT_SCHAR_POINTER;
              else if (flags & 1)
                type = TYPE_COUNT_SHORT_POINTER;
              else
                type = TYPE_COUNT_INT_POINTER;
              break;
            case '%':
              type = TYPE_NONE;
              break;
            default:
              /* Unknown conversion character.  */
              goto error;
            }
          }

          if (type != TYPE_NONE)
            {
            dp->arg_index = arg_index;
            if (dp->arg_index == ARG_NONE)
              {
                dp->arg_index = arg_posn++;
                if (dp->arg_index == ARG_NONE)
                  /* arg_posn wrapped around.  */
                  goto error;
              }
            REGISTER_ARG (dp->arg_index, type);
            }
          dp->conversion = c;
          dp->dir_end = cp;
        }

        d->count++;
        if (d->count >= d_allocated)
          {
            size_t memory_size;
            DIRECTIVE *memory;

            d_allocated = xtimes (d_allocated, 2);
            memory_size = xtimes (d_allocated, sizeof (DIRECTIVE));
            if (size_overflow_p (memory_size))
            /* Overflow, would lead to out of memory.  */
            goto error;
            memory = realloc (d->dir, memory_size);
            if (memory == NULL)
            /* Out of memory.  */
            goto error;
            d->dir = memory;
          }
      }
    }
  d->dir[d->count].dir_start = cp;

  d->max_width_length = max_width_length;
  d->max_precision_length = max_precision_length;
  return 0;

error:
  if (a->arg)
    free (a->arg);
  if (d->dir)
    free (d->dir);
  return -1;
}

#undef DIRECTIVES
#undef DIRECTIVE
#undef CHAR_T
#undef PRINTF_PARSE

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