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/* vsprintf with automatic memory allocation.
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Copyright (C) 1999, 2002-2003 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU Library General Public License as published
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by the Free Software Foundation; either version 2, or (at your option)
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This program 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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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/* Tell glibc's <stdio.h> to provide a prototype for snprintf().
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This must come before <config.h> because <config.h> may include
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<features.h>, and once <features.h> has been included, it's too late. */
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# define _GNU_SOURCE 1
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# include "vasnwprintf.h"
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# include "vasnprintf.h"
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#include <stdio.h> /* snprintf(), sprintf() */
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#include <stdlib.h> /* abort(), malloc(), realloc(), free() */
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#include <string.h> /* memcpy(), strlen() */
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#include <errno.h> /* errno */
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#include <limits.h> /* CHAR_BIT */
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#include <float.h> /* DBL_MAX_EXP, LDBL_MAX_EXP */
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# include "wprintf-parse.h"
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# include "printf-parse.h"
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/* Checked size_t computations. */
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# define local_wcslen wcslen
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/* Solaris 2.5.1 has wcslen() in a separate library libw.so. To avoid
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a dependency towards this library, here is a local substitute.
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Define this substitute only once, even if this file is included
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twice in the same compilation unit. */
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# ifndef local_wcslen_defined
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# define local_wcslen_defined 1
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local_wcslen (const wchar_t *s)
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for (ptr = s; *ptr != (wchar_t) 0; ptr++)
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# define VASNPRINTF vasnwprintf
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# define CHAR_T wchar_t
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# define DIRECTIVE wchar_t_directive
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# define DIRECTIVES wchar_t_directives
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# define PRINTF_PARSE wprintf_parse
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# define USE_SNPRINTF 1
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# if HAVE_DECL__SNWPRINTF
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/* On Windows, the function swprintf() has a different signature than
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on Unix; we use the _snwprintf() function instead. */
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# define SNPRINTF _snwprintf
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# define SNPRINTF swprintf
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# define VASNPRINTF vasnprintf
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# define DIRECTIVE char_directive
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# define DIRECTIVES char_directives
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# define PRINTF_PARSE printf_parse
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# define USE_SNPRINTF (HAVE_DECL__SNPRINTF || HAVE_SNPRINTF)
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# if HAVE_DECL__SNPRINTF
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# define SNPRINTF _snprintf
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# define SNPRINTF snprintf
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VASNPRINTF (CHAR_T *resultbuf, size_t *lengthp, const CHAR_T *format, va_list args)
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if (PRINTF_PARSE (format, &d, &a) < 0)
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if (printf_fetchargs (args, &a) < 0)
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size_t buf_neededlength;
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CHAR_T *buf_malloced;
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/* Output string accumulator. */
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/* Allocate a small buffer that will hold a directive passed to
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sprintf or snprintf. */
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xsum4 (7, d.max_width_length, d.max_precision_length, 6);
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if (buf_neededlength < 4000 / sizeof (CHAR_T))
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buf = (CHAR_T *) alloca (buf_neededlength * sizeof (CHAR_T));
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size_t buf_memsize = xtimes (buf_neededlength, sizeof (CHAR_T));
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if (size_overflow_p (buf_memsize))
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goto out_of_memory_1;
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buf = (CHAR_T *) malloc (buf_memsize);
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goto out_of_memory_1;
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if (resultbuf != NULL)
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allocated = *lengthp;
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result is either == resultbuf or == NULL or malloc-allocated.
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If length > 0, then result != NULL. */
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/* Ensures that allocated >= needed. Aborts through a jump to
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out_of_memory if needed is SIZE_MAX or otherwise too big. */
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#define ENSURE_ALLOCATION(needed) \
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if ((needed) > allocated) \
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size_t memory_size; \
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allocated = (allocated > 0 ? xtimes (allocated, 2) : 12); \
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if ((needed) > allocated) \
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allocated = (needed); \
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memory_size = xtimes (allocated, sizeof (CHAR_T)); \
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if (size_overflow_p (memory_size)) \
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goto out_of_memory; \
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if (result == resultbuf || result == NULL) \
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memory = (CHAR_T *) malloc (memory_size); \
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memory = (CHAR_T *) realloc (result, memory_size); \
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if (memory == NULL) \
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goto out_of_memory; \
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if (result == resultbuf && length > 0) \
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memcpy (memory, result, length * sizeof (CHAR_T)); \
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for (cp = format, i = 0, dp = &d.dir[0]; ; cp = dp->dir_end, i++, dp++)
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if (cp != dp->dir_start)
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size_t n = dp->dir_start - cp;
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size_t augmented_length = xsum (length, n);
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ENSURE_ALLOCATION (augmented_length);
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memcpy (result + length, cp, n * sizeof (CHAR_T));
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length = augmented_length;
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/* Execute a single directive. */
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if (dp->conversion == '%')
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size_t augmented_length;
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if (!(dp->arg_index == ARG_NONE))
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augmented_length = xsum (length, 1);
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ENSURE_ALLOCATION (augmented_length);
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result[length] = '%';
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length = augmented_length;
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if (!(dp->arg_index != ARG_NONE))
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if (dp->conversion == 'n')
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switch (a.arg[dp->arg_index].type)
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case TYPE_COUNT_SCHAR_POINTER:
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*a.arg[dp->arg_index].a.a_count_schar_pointer = length;
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case TYPE_COUNT_SHORT_POINTER:
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*a.arg[dp->arg_index].a.a_count_short_pointer = length;
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case TYPE_COUNT_INT_POINTER:
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*a.arg[dp->arg_index].a.a_count_int_pointer = length;
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case TYPE_COUNT_LONGINT_POINTER:
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*a.arg[dp->arg_index].a.a_count_longint_pointer = length;
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#ifdef HAVE_LONG_LONG
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case TYPE_COUNT_LONGLONGINT_POINTER:
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*a.arg[dp->arg_index].a.a_count_longlongint_pointer = length;
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arg_type type = a.arg[dp->arg_index].type;
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unsigned int prefix_count;
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/* Allocate a temporary buffer of sufficient size for calling
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if (dp->width_start != dp->width_end)
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if (dp->width_arg_index != ARG_NONE)
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if (!(a.arg[dp->width_arg_index].type == TYPE_INT))
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arg = a.arg[dp->width_arg_index].a.a_int;
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width = (arg < 0 ? (unsigned int) (-arg) : arg);
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const CHAR_T *digitp = dp->width_start;
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width = xsum (xtimes (width, 10), *digitp++ - '0');
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while (digitp != dp->width_end);
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if (dp->precision_start != dp->precision_end)
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if (dp->precision_arg_index != ARG_NONE)
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if (!(a.arg[dp->precision_arg_index].type == TYPE_INT))
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arg = a.arg[dp->precision_arg_index].a.a_int;
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precision = (arg < 0 ? 0 : arg);
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const CHAR_T *digitp = dp->precision_start + 1;
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precision = xsum (xtimes (precision, 10), *digitp++ - '0');
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while (digitp != dp->precision_end);
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switch (dp->conversion)
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case 'd': case 'i': case 'u':
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# ifdef HAVE_LONG_LONG
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if (type == TYPE_LONGLONGINT || type == TYPE_ULONGLONGINT)
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(unsigned int) (sizeof (unsigned long long) * CHAR_BIT
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* 0.30103 /* binary -> decimal */
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* 2 /* estimate for FLAG_GROUP */
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+ 1 /* turn floor into ceil */
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+ 1; /* account for leading sign */
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if (type == TYPE_LONGINT || type == TYPE_ULONGINT)
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(unsigned int) (sizeof (unsigned long) * CHAR_BIT
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* 0.30103 /* binary -> decimal */
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* 2 /* estimate for FLAG_GROUP */
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+ 1 /* turn floor into ceil */
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+ 1; /* account for leading sign */
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(unsigned int) (sizeof (unsigned int) * CHAR_BIT
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* 0.30103 /* binary -> decimal */
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* 2 /* estimate for FLAG_GROUP */
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+ 1 /* turn floor into ceil */
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+ 1; /* account for leading sign */
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# ifdef HAVE_LONG_LONG
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if (type == TYPE_LONGLONGINT || type == TYPE_ULONGLONGINT)
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(unsigned int) (sizeof (unsigned long long) * CHAR_BIT
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* 0.333334 /* binary -> octal */
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+ 1 /* turn floor into ceil */
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+ 1; /* account for leading sign */
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if (type == TYPE_LONGINT || type == TYPE_ULONGINT)
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(unsigned int) (sizeof (unsigned long) * CHAR_BIT
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* 0.333334 /* binary -> octal */
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+ 1 /* turn floor into ceil */
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+ 1; /* account for leading sign */
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(unsigned int) (sizeof (unsigned int) * CHAR_BIT
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* 0.333334 /* binary -> octal */
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+ 1 /* turn floor into ceil */
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+ 1; /* account for leading sign */
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# ifdef HAVE_LONG_LONG
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if (type == TYPE_LONGLONGINT || type == TYPE_ULONGLONGINT)
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(unsigned int) (sizeof (unsigned long long) * CHAR_BIT
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* 0.25 /* binary -> hexadecimal */
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+ 1 /* turn floor into ceil */
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+ 2; /* account for leading sign or alternate form */
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if (type == TYPE_LONGINT || type == TYPE_ULONGINT)
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(unsigned int) (sizeof (unsigned long) * CHAR_BIT
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* 0.25 /* binary -> hexadecimal */
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+ 1 /* turn floor into ceil */
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+ 2; /* account for leading sign or alternate form */
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(unsigned int) (sizeof (unsigned int) * CHAR_BIT
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* 0.25 /* binary -> hexadecimal */
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+ 1 /* turn floor into ceil */
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+ 2; /* account for leading sign or alternate form */
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# ifdef HAVE_LONG_DOUBLE
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if (type == TYPE_LONGDOUBLE)
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(unsigned int) (LDBL_MAX_EXP
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* 0.30103 /* binary -> decimal */
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* 2 /* estimate for FLAG_GROUP */
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+ 1 /* turn floor into ceil */
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+ 10; /* sign, decimal point etc. */
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(unsigned int) (DBL_MAX_EXP
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* 0.30103 /* binary -> decimal */
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* 2 /* estimate for FLAG_GROUP */
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+ 1 /* turn floor into ceil */
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+ 10; /* sign, decimal point etc. */
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tmp_length = xsum (tmp_length, precision);
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case 'e': case 'E': case 'g': case 'G':
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12; /* sign, decimal point, exponent etc. */
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tmp_length = xsum (tmp_length, precision);
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# if defined HAVE_WINT_T && !WIDE_CHAR_VERSION
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if (type == TYPE_WIDE_CHAR)
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tmp_length = MB_CUR_MAX;
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if (type == TYPE_WIDE_STRING)
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local_wcslen (a.arg[dp->arg_index].a.a_wide_string);
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# if !WIDE_CHAR_VERSION
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tmp_length = xtimes (tmp_length, MB_CUR_MAX);
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tmp_length = strlen (a.arg[dp->arg_index].a.a_string);
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(unsigned int) (sizeof (void *) * CHAR_BIT
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* 0.25 /* binary -> hexadecimal */
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+ 1 /* turn floor into ceil */
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+ 2; /* account for leading 0x */
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if (tmp_length < width)
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tmp_length = xsum (tmp_length, 1); /* account for trailing NUL */
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if (tmp_length <= sizeof (tmpbuf) / sizeof (CHAR_T))
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size_t tmp_memsize = xtimes (tmp_length, sizeof (CHAR_T));
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if (size_overflow_p (tmp_memsize))
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/* Overflow, would lead to out of memory. */
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tmp = (CHAR_T *) malloc (tmp_memsize);
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/* Construct the format string for calling snprintf or
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if (dp->flags & FLAG_GROUP)
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if (dp->flags & FLAG_LEFT)
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if (dp->flags & FLAG_SHOWSIGN)
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if (dp->flags & FLAG_SPACE)
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if (dp->flags & FLAG_ALT)
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if (dp->flags & FLAG_ZERO)
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if (dp->width_start != dp->width_end)
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size_t n = dp->width_end - dp->width_start;
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memcpy (p, dp->width_start, n * sizeof (CHAR_T));
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if (dp->precision_start != dp->precision_end)
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size_t n = dp->precision_end - dp->precision_start;
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memcpy (p, dp->precision_start, n * sizeof (CHAR_T));
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#ifdef HAVE_LONG_LONG
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case TYPE_LONGLONGINT:
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case TYPE_ULONGLONGINT:
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case TYPE_WIDE_STRING:
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#ifdef HAVE_LONG_DOUBLE
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case TYPE_LONGDOUBLE:
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/* Construct the arguments for calling snprintf or sprintf. */
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if (dp->width_arg_index != ARG_NONE)
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if (!(a.arg[dp->width_arg_index].type == TYPE_INT))
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prefixes[prefix_count++] = a.arg[dp->width_arg_index].a.a_int;
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if (dp->precision_arg_index != ARG_NONE)
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if (!(a.arg[dp->precision_arg_index].type == TYPE_INT))
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prefixes[prefix_count++] = a.arg[dp->precision_arg_index].a.a_int;
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/* Prepare checking whether snprintf returns the count
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ENSURE_ALLOCATION (xsum (length, 1));
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result[length] = '\0';
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maxlen = allocated - length;
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# define SNPRINTF_BUF(arg) \
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switch (prefix_count) \
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retcount = SNPRINTF (result + length, maxlen, buf, \
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retcount = SNPRINTF (result + length, maxlen, buf, \
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prefixes[0], arg, &count); \
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retcount = SNPRINTF (result + length, maxlen, buf, \
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prefixes[0], prefixes[1], arg, \
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# define SNPRINTF_BUF(arg) \
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switch (prefix_count) \
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count = sprintf (tmp, buf, arg); \
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count = sprintf (tmp, buf, prefixes[0], arg); \
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count = sprintf (tmp, buf, prefixes[0], prefixes[1],\
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int arg = a.arg[dp->arg_index].a.a_schar;
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unsigned int arg = a.arg[dp->arg_index].a.a_uchar;
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int arg = a.arg[dp->arg_index].a.a_short;
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unsigned int arg = a.arg[dp->arg_index].a.a_ushort;
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int arg = a.arg[dp->arg_index].a.a_int;
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unsigned int arg = a.arg[dp->arg_index].a.a_uint;
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long int arg = a.arg[dp->arg_index].a.a_longint;
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unsigned long int arg = a.arg[dp->arg_index].a.a_ulongint;
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#ifdef HAVE_LONG_LONG
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case TYPE_LONGLONGINT:
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long long int arg = a.arg[dp->arg_index].a.a_longlongint;
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case TYPE_ULONGLONGINT:
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unsigned long long int arg = a.arg[dp->arg_index].a.a_ulonglongint;
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double arg = a.arg[dp->arg_index].a.a_double;
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#ifdef HAVE_LONG_DOUBLE
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case TYPE_LONGDOUBLE:
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long double arg = a.arg[dp->arg_index].a.a_longdouble;
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int arg = a.arg[dp->arg_index].a.a_char;
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wint_t arg = a.arg[dp->arg_index].a.a_wide_char;
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const char *arg = a.arg[dp->arg_index].a.a_string;
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case TYPE_WIDE_STRING:
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const wchar_t *arg = a.arg[dp->arg_index].a.a_wide_string;
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void *arg = a.arg[dp->arg_index].a.a_pointer;
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/* Portability: Not all implementations of snprintf()
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are ISO C 99 compliant. Determine the number of
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bytes that snprintf() has produced or would have
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/* Verify that snprintf() has NUL-terminated its
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if (count < maxlen && result[length + count] != '\0')
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/* Portability hack. */
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if (retcount > count)
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/* snprintf() doesn't understand the '%n'
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/* Don't use the '%n' directive; instead, look
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at the snprintf() return value. */
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/* Look at the snprintf() return value. */
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/* HP-UX 10.20 snprintf() is doubly deficient:
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It doesn't understand the '%n' directive,
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*and* it returns -1 (rather than the length
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that would have been required) when the
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buffer is too small. */
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xsum (xtimes (allocated, 2), 12);
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ENSURE_ALLOCATION (bigger_need);
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/* Attempt to handle failure. */
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if (!(result == resultbuf || result == NULL))
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if (buf_malloced != NULL)
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if (count >= tmp_length)
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/* tmp_length was incorrectly calculated - fix the
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/* Make room for the result. */
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/* Need at least count bytes. But allocate
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proportionally, to avoid looping eternally if
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snprintf() reports a too small count. */
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xmax (xsum (length, count), xtimes (allocated, 2));
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ENSURE_ALLOCATION (n);
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/* The snprintf() result did fit. */
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/* Append the sprintf() result. */
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memcpy (result + length, tmp, count * sizeof (CHAR_T));
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/* Add the final NUL. */
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ENSURE_ALLOCATION (xsum (length, 1));
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result[length] = '\0';
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if (result != resultbuf && length + 1 < allocated)
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/* Shrink the allocated memory if possible. */
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memory = (CHAR_T *) realloc (result, (length + 1) * sizeof (CHAR_T));
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if (buf_malloced != NULL)
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if (!(result == resultbuf || result == NULL))
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if (buf_malloced != NULL)
added
removed
intl/vasnprintf.c
