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vasnprintf.c

/* vsprintf with automatic memory allocation.
   Copyright (C) 1999, 2002-2006 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU 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 General Public License for more details.

   You should have received a copy of the GNU General Public License along
   with this program; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */

/* Tell glibc's <stdio.h> to provide a prototype for snprintf().
   This must come before <config.h> because <config.h> may include
   <features.h>, and once <features.h> has been included, it's too late.  */
#ifndef _GNU_SOURCE
# define _GNU_SOURCE    1
#endif

#include <config.h>
#ifndef IN_LIBINTL
# include <alloca.h>
#endif

/* Specification.  */
#if WIDE_CHAR_VERSION
# include "vasnwprintf.h"
#else
# include "vasnprintf.h"
#endif

#include <stdio.h>      /* snprintf(), sprintf() */
#include <stdlib.h>     /* abort(), malloc(), realloc(), free() */
#include <string.h>     /* memcpy(), strlen() */
#include <errno.h>      /* errno */
#include <limits.h>     /* CHAR_BIT */
#include <float.h>      /* DBL_MAX_EXP, LDBL_MAX_EXP */
#if WIDE_CHAR_VERSION
# include "wprintf-parse.h"
#else
# include "printf-parse.h"
#endif

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

#ifdef HAVE_WCHAR_T
# ifdef HAVE_WCSLEN
#  define local_wcslen wcslen
# else
   /* Solaris 2.5.1 has wcslen() in a separate library libw.so. To avoid
      a dependency towards this library, here is a local substitute.
      Define this substitute only once, even if this file is included
      twice in the same compilation unit.  */
#  ifndef local_wcslen_defined
#   define local_wcslen_defined 1
static size_t
local_wcslen (const wchar_t *s)
{
  const wchar_t *ptr;

  for (ptr = s; *ptr != (wchar_t) 0; ptr++)
    ;
  return ptr - s;
}
#  endif
# endif
#endif

#if WIDE_CHAR_VERSION
# define VASNPRINTF vasnwprintf
# define CHAR_T wchar_t
# define DIRECTIVE wchar_t_directive
# define DIRECTIVES wchar_t_directives
# define PRINTF_PARSE wprintf_parse
# define USE_SNPRINTF 1
# if HAVE_DECL__SNWPRINTF
   /* On Windows, the function swprintf() has a different signature than
      on Unix; we use the _snwprintf() function instead.  */
#  define SNPRINTF _snwprintf
# else
   /* Unix.  */
#  define SNPRINTF swprintf
# endif
#else
# define VASNPRINTF vasnprintf
# define CHAR_T char
# define DIRECTIVE char_directive
# define DIRECTIVES char_directives
# define PRINTF_PARSE printf_parse
# define USE_SNPRINTF (HAVE_DECL__SNPRINTF || HAVE_SNPRINTF)
# if HAVE_DECL__SNPRINTF
   /* Windows.  */
#  define SNPRINTF _snprintf
# else
   /* Unix.  */
#  define SNPRINTF snprintf
# endif
#endif

CHAR_T *
VASNPRINTF (CHAR_T *resultbuf, size_t *lengthp, const CHAR_T *format, va_list args)
{
  DIRECTIVES d;
  arguments a;

  if (PRINTF_PARSE (format, &d, &a) < 0)
    {
      errno = EINVAL;
      return NULL;
    }

#define CLEANUP() \
  free (d.dir);                                             \
  if (a.arg)                                                \
    free (a.arg);

  if (printf_fetchargs (args, &a) < 0)
    {
      CLEANUP ();
      errno = EINVAL;
      return NULL;
    }

  {
    size_t buf_neededlength;
    CHAR_T *buf;
    CHAR_T *buf_malloced;
    const CHAR_T *cp;
    size_t i;
    DIRECTIVE *dp;
    /* Output string accumulator.  */
    CHAR_T *result;
    size_t allocated;
    size_t length;

    /* Allocate a small buffer that will hold a directive passed to
       sprintf or snprintf.  */
    buf_neededlength =
      xsum4 (7, d.max_width_length, d.max_precision_length, 6);
#if HAVE_ALLOCA
    if (buf_neededlength < 4000 / sizeof (CHAR_T))
      {
      buf = (CHAR_T *) alloca (buf_neededlength * sizeof (CHAR_T));
      buf_malloced = NULL;
      }
    else
#endif
      {
      size_t buf_memsize = xtimes (buf_neededlength, sizeof (CHAR_T));
      if (size_overflow_p (buf_memsize))
        goto out_of_memory_1;
      buf = (CHAR_T *) malloc (buf_memsize);
      if (buf == NULL)
        goto out_of_memory_1;
      buf_malloced = buf;
      }

    if (resultbuf != NULL)
      {
      result = resultbuf;
      allocated = *lengthp;
      }
    else
      {
      result = NULL;
      allocated = 0;
      }
    length = 0;
    /* Invariants:
       result is either == resultbuf or == NULL or malloc-allocated.
       If length > 0, then result != NULL.  */

    /* Ensures that allocated >= needed.  Aborts through a jump to
       out_of_memory if needed is SIZE_MAX or otherwise too big.  */
#define ENSURE_ALLOCATION(needed) \
    if ((needed) > allocated)                                    \
      {                                                          \
      size_t memory_size;                                        \
      CHAR_T *memory;                                            \
                                                           \
      allocated = (allocated > 0 ? xtimes (allocated, 2) : 12);        \
      if ((needed) > allocated)                                  \
        allocated = (needed);                                    \
      memory_size = xtimes (allocated, sizeof (CHAR_T));               \
      if (size_overflow_p (memory_size))                         \
        goto out_of_memory;                                      \
      if (result == resultbuf || result == NULL)                       \
        memory = (CHAR_T *) malloc (memory_size);                      \
      else                                                 \
        memory = (CHAR_T *) realloc (result, memory_size);             \
      if (memory == NULL)                                        \
        goto out_of_memory;                                      \
      if (result == resultbuf && length > 0)                           \
        memcpy (memory, result, length * sizeof (CHAR_T));             \
      result = memory;                                     \
      }

    for (cp = format, i = 0, dp = &d.dir[0]; ; cp = dp->dir_end, i++, dp++)
      {
      if (cp != dp->dir_start)
        {
          size_t n = dp->dir_start - cp;
          size_t augmented_length = xsum (length, n);

          ENSURE_ALLOCATION (augmented_length);
          memcpy (result + length, cp, n * sizeof (CHAR_T));
          length = augmented_length;
        }
      if (i == d.count)
        break;

      /* Execute a single directive.  */
      if (dp->conversion == '%')
        {
          size_t augmented_length;

          if (!(dp->arg_index == ARG_NONE))
            abort ();
          augmented_length = xsum (length, 1);
          ENSURE_ALLOCATION (augmented_length);
          result[length] = '%';
          length = augmented_length;
        }
      else
        {
          if (!(dp->arg_index != ARG_NONE))
            abort ();

          if (dp->conversion == 'n')
            {
            switch (a.arg[dp->arg_index].type)
              {
              case TYPE_COUNT_SCHAR_POINTER:
                *a.arg[dp->arg_index].a.a_count_schar_pointer = length;
                break;
              case TYPE_COUNT_SHORT_POINTER:
                *a.arg[dp->arg_index].a.a_count_short_pointer = length;
                break;
              case TYPE_COUNT_INT_POINTER:
                *a.arg[dp->arg_index].a.a_count_int_pointer = length;
                break;
              case TYPE_COUNT_LONGINT_POINTER:
                *a.arg[dp->arg_index].a.a_count_longint_pointer = length;
                break;
#ifdef HAVE_LONG_LONG_INT
              case TYPE_COUNT_LONGLONGINT_POINTER:
                *a.arg[dp->arg_index].a.a_count_longlongint_pointer = length;
                break;
#endif
              default:
                abort ();
              }
            }
          else
            {
            arg_type type = a.arg[dp->arg_index].type;
            CHAR_T *p;
            unsigned int prefix_count;
            int prefixes[2];
#if !USE_SNPRINTF
            size_t tmp_length;
            CHAR_T tmpbuf[700];
            CHAR_T *tmp;

            /* Allocate a temporary buffer of sufficient size for calling
               sprintf.  */
            {
              size_t width;
              size_t precision;

              width = 0;
              if (dp->width_start != dp->width_end)
                {
                  if (dp->width_arg_index != ARG_NONE)
                  {
                    int arg;

                    if (!(a.arg[dp->width_arg_index].type == TYPE_INT))
                      abort ();
                    arg = a.arg[dp->width_arg_index].a.a_int;
                    width = (arg < 0 ? (unsigned int) (-arg) : arg);
                  }
                  else
                  {
                    const CHAR_T *digitp = dp->width_start;

                    do
                      width = xsum (xtimes (width, 10), *digitp++ - '0');
                    while (digitp != dp->width_end);
                  }
                }

              precision = 6;
              if (dp->precision_start != dp->precision_end)
                {
                  if (dp->precision_arg_index != ARG_NONE)
                  {
                    int arg;

                    if (!(a.arg[dp->precision_arg_index].type == TYPE_INT))
                      abort ();
                    arg = a.arg[dp->precision_arg_index].a.a_int;
                    precision = (arg < 0 ? 0 : arg);
                  }
                  else
                  {
                    const CHAR_T *digitp = dp->precision_start + 1;

                    precision = 0;
                    while (digitp != dp->precision_end)
                      precision = xsum (xtimes (precision, 10), *digitp++ - '0');
                  }
                }

              switch (dp->conversion)
                {

                case 'd': case 'i': case 'u':
# ifdef HAVE_LONG_LONG_INT
                  if (type == TYPE_LONGLONGINT || type == TYPE_ULONGLONGINT)
                  tmp_length =
                    (unsigned int) (sizeof (unsigned long long) * CHAR_BIT
                                * 0.30103 /* binary -> decimal */
                               )
                    + 1; /* turn floor into ceil */
                  else
# endif
                  if (type == TYPE_LONGINT || type == TYPE_ULONGINT)
                  tmp_length =
                    (unsigned int) (sizeof (unsigned long) * CHAR_BIT
                                * 0.30103 /* binary -> decimal */
                               )
                    + 1; /* turn floor into ceil */
                  else
                  tmp_length =
                    (unsigned int) (sizeof (unsigned int) * CHAR_BIT
                                * 0.30103 /* binary -> decimal */
                               )
                    + 1; /* turn floor into ceil */
                  if (tmp_length < precision)
                  tmp_length = precision;
                  /* Multiply by 2, as an estimate for FLAG_GROUP.  */
                  tmp_length = xsum (tmp_length, tmp_length);
                  /* Add 1, to account for a leading sign.  */
                  tmp_length = xsum (tmp_length, 1);
                  break;

                case 'o':
# ifdef HAVE_LONG_LONG_INT
                  if (type == TYPE_LONGLONGINT || type == TYPE_ULONGLONGINT)
                  tmp_length =
                    (unsigned int) (sizeof (unsigned long long) * CHAR_BIT
                                * 0.333334 /* binary -> octal */
                               )
                    + 1; /* turn floor into ceil */
                  else
# endif
                  if (type == TYPE_LONGINT || type == TYPE_ULONGINT)
                  tmp_length =
                    (unsigned int) (sizeof (unsigned long) * CHAR_BIT
                                * 0.333334 /* binary -> octal */
                               )
                    + 1; /* turn floor into ceil */
                  else
                  tmp_length =
                    (unsigned int) (sizeof (unsigned int) * CHAR_BIT
                                * 0.333334 /* binary -> octal */
                               )
                    + 1; /* turn floor into ceil */
                  if (tmp_length < precision)
                  tmp_length = precision;
                  /* Add 1, to account for a leading sign.  */
                  tmp_length = xsum (tmp_length, 1);
                  break;

                case 'x': case 'X':
# ifdef HAVE_LONG_LONG_INT
                  if (type == TYPE_LONGLONGINT || type == TYPE_ULONGLONGINT)
                  tmp_length =
                    (unsigned int) (sizeof (unsigned long long) * CHAR_BIT
                                * 0.25 /* binary -> hexadecimal */
                               )
                    + 1; /* turn floor into ceil */
                  else
# endif
                  if (type == TYPE_LONGINT || type == TYPE_ULONGINT)
                  tmp_length =
                    (unsigned int) (sizeof (unsigned long) * CHAR_BIT
                                * 0.25 /* binary -> hexadecimal */
                               )
                    + 1; /* turn floor into ceil */
                  else
                  tmp_length =
                    (unsigned int) (sizeof (unsigned int) * CHAR_BIT
                                * 0.25 /* binary -> hexadecimal */
                               )
                    + 1; /* turn floor into ceil */
                  if (tmp_length < precision)
                  tmp_length = precision;
                  /* Add 2, to account for a leading sign or alternate form.  */
                  tmp_length = xsum (tmp_length, 2);
                  break;

                case 'f': case 'F':
# ifdef HAVE_LONG_DOUBLE
                  if (type == TYPE_LONGDOUBLE)
                  tmp_length =
                    (unsigned int) (LDBL_MAX_EXP
                                * 0.30103 /* binary -> decimal */
                                * 2 /* estimate for FLAG_GROUP */
                               )
                    + 1 /* turn floor into ceil */
                    + 10; /* sign, decimal point etc. */
                  else
# endif
                  tmp_length =
                    (unsigned int) (DBL_MAX_EXP
                                * 0.30103 /* binary -> decimal */
                                * 2 /* estimate for FLAG_GROUP */
                               )
                    + 1 /* turn floor into ceil */
                    + 10; /* sign, decimal point etc. */
                  tmp_length = xsum (tmp_length, precision);
                  break;

                case 'e': case 'E': case 'g': case 'G':
                case 'a': case 'A':
                  tmp_length =
                  12; /* sign, decimal point, exponent etc. */
                  tmp_length = xsum (tmp_length, precision);
                  break;

                case 'c':
# if defined HAVE_WINT_T && !WIDE_CHAR_VERSION
                  if (type == TYPE_WIDE_CHAR)
                  tmp_length = MB_CUR_MAX;
                  else
# endif
                  tmp_length = 1;
                  break;

                case 's':
# ifdef HAVE_WCHAR_T
                  if (type == TYPE_WIDE_STRING)
                  {
                    tmp_length =
                      local_wcslen (a.arg[dp->arg_index].a.a_wide_string);

#  if !WIDE_CHAR_VERSION
                    tmp_length = xtimes (tmp_length, MB_CUR_MAX);
#  endif
                  }
                  else
# endif
                  tmp_length = strlen (a.arg[dp->arg_index].a.a_string);
                  break;

                case 'p':
                  tmp_length =
                  (unsigned int) (sizeof (void *) * CHAR_BIT
                              * 0.25 /* binary -> hexadecimal */
                               )
                    + 1 /* turn floor into ceil */
                    + 2; /* account for leading 0x */
                  break;

                default:
                  abort ();
                }

              if (tmp_length < width)
                tmp_length = width;

              tmp_length = xsum (tmp_length, 1); /* account for trailing NUL */
            }

            if (tmp_length <= sizeof (tmpbuf) / sizeof (CHAR_T))
              tmp = tmpbuf;
            else
              {
                size_t tmp_memsize = xtimes (tmp_length, sizeof (CHAR_T));

                if (size_overflow_p (tmp_memsize))
                  /* Overflow, would lead to out of memory.  */
                  goto out_of_memory;
                tmp = (CHAR_T *) malloc (tmp_memsize);
                if (tmp == NULL)
                  /* Out of memory.  */
                  goto out_of_memory;
              }
#endif

            /* Construct the format string for calling snprintf or
               sprintf.  */
            p = buf;
            *p++ = '%';
            if (dp->flags & FLAG_GROUP)
              *p++ = '\'';
            if (dp->flags & FLAG_LEFT)
              *p++ = '-';
            if (dp->flags & FLAG_SHOWSIGN)
              *p++ = '+';
            if (dp->flags & FLAG_SPACE)
              *p++ = ' ';
            if (dp->flags & FLAG_ALT)
              *p++ = '#';
            if (dp->flags & FLAG_ZERO)
              *p++ = '0';
            if (dp->width_start != dp->width_end)
              {
                size_t n = dp->width_end - dp->width_start;
                memcpy (p, dp->width_start, n * sizeof (CHAR_T));
                p += n;
              }
            if (dp->precision_start != dp->precision_end)
              {
                size_t n = dp->precision_end - dp->precision_start;
                memcpy (p, dp->precision_start, n * sizeof (CHAR_T));
                p += n;
              }

            switch (type)
              {
#ifdef HAVE_LONG_LONG_INT
              case TYPE_LONGLONGINT:
              case TYPE_ULONGLONGINT:
                *p++ = 'l';
                /*FALLTHROUGH*/
#endif
              case TYPE_LONGINT:
              case TYPE_ULONGINT:
#ifdef HAVE_WINT_T
              case TYPE_WIDE_CHAR:
#endif
#ifdef HAVE_WCHAR_T
              case TYPE_WIDE_STRING:
#endif
                *p++ = 'l';
                break;
#ifdef HAVE_LONG_DOUBLE
              case TYPE_LONGDOUBLE:
                *p++ = 'L';
                break;
#endif
              default:
                break;
              }
            *p = dp->conversion;
#if USE_SNPRINTF
            p[1] = '%';
            p[2] = 'n';
            p[3] = '\0';
#else
            p[1] = '\0';
#endif

            /* Construct the arguments for calling snprintf or sprintf.  */
            prefix_count = 0;
            if (dp->width_arg_index != ARG_NONE)
              {
                if (!(a.arg[dp->width_arg_index].type == TYPE_INT))
                  abort ();
                prefixes[prefix_count++] = a.arg[dp->width_arg_index].a.a_int;
              }
            if (dp->precision_arg_index != ARG_NONE)
              {
                if (!(a.arg[dp->precision_arg_index].type == TYPE_INT))
                  abort ();
                prefixes[prefix_count++] = a.arg[dp->precision_arg_index].a.a_int;
              }

#if USE_SNPRINTF
            /* Prepare checking whether snprintf returns the count
               via %n.  */
            ENSURE_ALLOCATION (xsum (length, 1));
            result[length] = '\0';
#endif

            for (;;)
              {
                size_t maxlen;
                int count;
                int retcount;

                maxlen = allocated - length;
                count = -1;
                retcount = 0;

#if USE_SNPRINTF
# define SNPRINTF_BUF(arg) \
                switch (prefix_count)                           \
                  {                                             \
                  case 0:                                       \
                  retcount = SNPRINTF (result + length, maxlen, buf,  \
                                   arg, &count);                \
                  break;                                        \
                  case 1:                                       \
                  retcount = SNPRINTF (result + length, maxlen, buf,  \
                                   prefixes[0], arg, &count);         \
                  break;                                        \
                  case 2:                                       \
                  retcount = SNPRINTF (result + length, maxlen, buf,  \
                                   prefixes[0], prefixes[1], arg, \
                                   &count);                     \
                  break;                                        \
                  default:                                      \
                  abort ();                               \
                  }
#else
# define SNPRINTF_BUF(arg) \
                switch (prefix_count)                           \
                  {                                             \
                  case 0:                                       \
                  count = sprintf (tmp, buf, arg);              \
                  break;                                        \
                  case 1:                                       \
                  count = sprintf (tmp, buf, prefixes[0], arg);       \
                  break;                                        \
                  case 2:                                       \
                  count = sprintf (tmp, buf, prefixes[0], prefixes[1],\
                               arg);                            \
                  break;                                        \
                  default:                                      \
                  abort ();                               \
                  }
#endif

                switch (type)
                  {
                  case TYPE_SCHAR:
                  {
                    int arg = a.arg[dp->arg_index].a.a_schar;
                    SNPRINTF_BUF (arg);
                  }
                  break;
                  case TYPE_UCHAR:
                  {
                    unsigned int arg = a.arg[dp->arg_index].a.a_uchar;
                    SNPRINTF_BUF (arg);
                  }
                  break;
                  case TYPE_SHORT:
                  {
                    int arg = a.arg[dp->arg_index].a.a_short;
                    SNPRINTF_BUF (arg);
                  }
                  break;
                  case TYPE_USHORT:
                  {
                    unsigned int arg = a.arg[dp->arg_index].a.a_ushort;
                    SNPRINTF_BUF (arg);
                  }
                  break;
                  case TYPE_INT:
                  {
                    int arg = a.arg[dp->arg_index].a.a_int;
                    SNPRINTF_BUF (arg);
                  }
                  break;
                  case TYPE_UINT:
                  {
                    unsigned int arg = a.arg[dp->arg_index].a.a_uint;
                    SNPRINTF_BUF (arg);
                  }
                  break;
                  case TYPE_LONGINT:
                  {
                    long int arg = a.arg[dp->arg_index].a.a_longint;
                    SNPRINTF_BUF (arg);
                  }
                  break;
                  case TYPE_ULONGINT:
                  {
                    unsigned long int arg = a.arg[dp->arg_index].a.a_ulongint;
                    SNPRINTF_BUF (arg);
                  }
                  break;
#ifdef HAVE_LONG_LONG_INT
                  case TYPE_LONGLONGINT:
                  {
                    long long int arg = a.arg[dp->arg_index].a.a_longlongint;
                    SNPRINTF_BUF (arg);
                  }
                  break;
                  case TYPE_ULONGLONGINT:
                  {
                    unsigned long long int arg = a.arg[dp->arg_index].a.a_ulonglongint;
                    SNPRINTF_BUF (arg);
                  }
                  break;
#endif
                  case TYPE_DOUBLE:
                  {
                    double arg = a.arg[dp->arg_index].a.a_double;
                    SNPRINTF_BUF (arg);
                  }
                  break;
#ifdef HAVE_LONG_DOUBLE
                  case TYPE_LONGDOUBLE:
                  {
                    long double arg = a.arg[dp->arg_index].a.a_longdouble;
                    SNPRINTF_BUF (arg);
                  }
                  break;
#endif
                  case TYPE_CHAR:
                  {
                    int arg = a.arg[dp->arg_index].a.a_char;
                    SNPRINTF_BUF (arg);
                  }
                  break;
#ifdef HAVE_WINT_T
                  case TYPE_WIDE_CHAR:
                  {
                    wint_t arg = a.arg[dp->arg_index].a.a_wide_char;
                    SNPRINTF_BUF (arg);
                  }
                  break;
#endif
                  case TYPE_STRING:
                  {
                    const char *arg = a.arg[dp->arg_index].a.a_string;
                    SNPRINTF_BUF (arg);
                  }
                  break;
#ifdef HAVE_WCHAR_T
                  case TYPE_WIDE_STRING:
                  {
                    const wchar_t *arg = a.arg[dp->arg_index].a.a_wide_string;
                    SNPRINTF_BUF (arg);
                  }
                  break;
#endif
                  case TYPE_POINTER:
                  {
                    void *arg = a.arg[dp->arg_index].a.a_pointer;
                    SNPRINTF_BUF (arg);
                  }
                  break;
                  default:
                  abort ();
                  }

#if USE_SNPRINTF
                /* Portability: Not all implementations of snprintf()
                   are ISO C 99 compliant.  Determine the number of
                   bytes that snprintf() has produced or would have
                   produced.  */
                if (count >= 0)
                  {
                  /* Verify that snprintf() has NUL-terminated its
                     result.  */
                  if (count < maxlen && result[length + count] != '\0')
                    abort ();
                  /* Portability hack.  */
                  if (retcount > count)
                    count = retcount;
                  }
                else
                  {
                  /* snprintf() doesn't understand the '%n'
                     directive.  */
                  if (p[1] != '\0')
                    {
                      /* Don't use the '%n' directive; instead, look
                         at the snprintf() return value.  */
                      p[1] = '\0';
                      continue;
                    }
                  else
                    {
                      /* Look at the snprintf() return value.  */
                      if (retcount < 0)
                        {
                        /* HP-UX 10.20 snprintf() is doubly deficient:
                           It doesn't understand the '%n' directive,
                           *and* it returns -1 (rather than the length
                           that would have been required) when the
                           buffer is too small.  */
                        size_t bigger_need =
                          xsum (xtimes (allocated, 2), 12);
                        ENSURE_ALLOCATION (bigger_need);
                        continue;
                        }
                      else
                        count = retcount;
                    }
                  }
#endif

                /* Attempt to handle failure.  */
                if (count < 0)
                  {
                  if (!(result == resultbuf || result == NULL))
                    free (result);
                  if (buf_malloced != NULL)
                    free (buf_malloced);
                  CLEANUP ();
                  errno = EINVAL;
                  return NULL;
                  }

#if !USE_SNPRINTF
                if (count >= tmp_length)
                  /* tmp_length was incorrectly calculated - fix the
                   code above!  */
                  abort ();
#endif

                /* Make room for the result.  */
                if (count >= maxlen)
                  {
                  /* Need at least count bytes.  But allocate
                     proportionally, to avoid looping eternally if
                     snprintf() reports a too small count.  */
                  size_t n =
                    xmax (xsum (length, count), xtimes (allocated, 2));

                  ENSURE_ALLOCATION (n);
#if USE_SNPRINTF
                  continue;
#endif
                  }

#if USE_SNPRINTF
                /* The snprintf() result did fit.  */
#else
                /* Append the sprintf() result.  */
                memcpy (result + length, tmp, count * sizeof (CHAR_T));
                if (tmp != tmpbuf)
                  free (tmp);
#endif

                length += count;
                break;
              }
            }
        }
      }

    /* Add the final NUL.  */
    ENSURE_ALLOCATION (xsum (length, 1));
    result[length] = '\0';

    if (result != resultbuf && length + 1 < allocated)
      {
      /* Shrink the allocated memory if possible.  */
      CHAR_T *memory;

      memory = (CHAR_T *) realloc (result, (length + 1) * sizeof (CHAR_T));
      if (memory != NULL)
        result = memory;
      }

    if (buf_malloced != NULL)
      free (buf_malloced);
    CLEANUP ();
    *lengthp = length;
    /* Note that we can produce a big string of a length > INT_MAX.  POSIX
       says that snprintf() fails with errno = EOVERFLOW in this case, but
       that's only because snprintf() returns an 'int'.  This function does
       not have this limitation.  */
    return result;

  out_of_memory:
    if (!(result == resultbuf || result == NULL))
      free (result);
    if (buf_malloced != NULL)
      free (buf_malloced);
  out_of_memory_1:
    CLEANUP ();
    errno = ENOMEM;
    return NULL;
  }
}

#undef SNPRINTF
#undef USE_SNPRINTF
#undef PRINTF_PARSE
#undef DIRECTIVES
#undef DIRECTIVE
#undef CHAR_T
#undef VASNPRINTF

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