890 lines
22 KiB
C
890 lines
22 KiB
C
/* vsprintf with automatic memory allocation.
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Copyright (C) 1999, 2002-2006 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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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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#ifndef _GNU_SOURCE
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# define _GNU_SOURCE 1
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#endif
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#include <config.h>
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#ifndef IN_LIBINTL
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# include <alloca.h>
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#endif
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/* Specification. */
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#if WIDE_CHAR_VERSION
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# include "vasnwprintf.h"
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#else
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# include "vasnprintf.h"
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#endif
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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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#if WIDE_CHAR_VERSION
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# include "wprintf-parse.h"
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#else
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# include "printf-parse.h"
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#endif
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/* Checked size_t computations. */
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#include "xsize.h"
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#ifdef HAVE_WCHAR_T
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# ifdef HAVE_WCSLEN
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# define local_wcslen wcslen
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# else
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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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static size_t
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local_wcslen (const wchar_t *s)
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{
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const wchar_t *ptr;
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for (ptr = s; *ptr != (wchar_t) 0; ptr++)
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;
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return ptr - s;
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}
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# endif
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# endif
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#endif
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#if WIDE_CHAR_VERSION
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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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# else
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/* Unix. */
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# define SNPRINTF swprintf
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# endif
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#else
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# define VASNPRINTF vasnprintf
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# define CHAR_T char
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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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/* Windows. */
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# define SNPRINTF _snprintf
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# else
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/* Unix. */
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# define SNPRINTF snprintf
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# endif
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#endif
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CHAR_T *
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VASNPRINTF (CHAR_T *resultbuf, size_t *lengthp, const CHAR_T *format, va_list args)
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{
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DIRECTIVES d;
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arguments a;
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if (PRINTF_PARSE (format, &d, &a) < 0)
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{
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errno = EINVAL;
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return NULL;
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}
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#define CLEANUP() \
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free (d.dir); \
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if (a.arg) \
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free (a.arg);
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if (printf_fetchargs (args, &a) < 0)
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{
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CLEANUP ();
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errno = EINVAL;
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return NULL;
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}
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{
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size_t buf_neededlength;
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CHAR_T *buf;
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CHAR_T *buf_malloced;
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const CHAR_T *cp;
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size_t i;
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DIRECTIVE *dp;
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/* Output string accumulator. */
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CHAR_T *result;
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size_t allocated;
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size_t length;
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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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buf_neededlength =
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xsum4 (7, d.max_width_length, d.max_precision_length, 6);
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#if HAVE_ALLOCA
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if (buf_neededlength < 4000 / sizeof (CHAR_T))
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{
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buf = (CHAR_T *) alloca (buf_neededlength * sizeof (CHAR_T));
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buf_malloced = NULL;
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}
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else
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#endif
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{
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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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if (buf == NULL)
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goto out_of_memory_1;
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buf_malloced = buf;
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}
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if (resultbuf != NULL)
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{
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result = resultbuf;
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allocated = *lengthp;
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}
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else
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{
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result = NULL;
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allocated = 0;
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}
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length = 0;
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/* Invariants:
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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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{ \
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size_t memory_size; \
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CHAR_T *memory; \
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\
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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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else \
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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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result = memory; \
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}
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for (cp = format, i = 0, dp = &d.dir[0]; ; cp = dp->dir_end, i++, dp++)
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{
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if (cp != dp->dir_start)
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{
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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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}
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if (i == d.count)
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break;
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/* Execute a single directive. */
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if (dp->conversion == '%')
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{
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size_t augmented_length;
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if (!(dp->arg_index == ARG_NONE))
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abort ();
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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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}
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else
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{
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if (!(dp->arg_index != ARG_NONE))
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abort ();
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if (dp->conversion == 'n')
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{
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switch (a.arg[dp->arg_index].type)
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{
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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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break;
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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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break;
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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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break;
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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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break;
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#ifdef HAVE_LONG_LONG_INT
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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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break;
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#endif
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default:
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abort ();
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}
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}
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else
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{
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arg_type type = a.arg[dp->arg_index].type;
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CHAR_T *p;
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unsigned int prefix_count;
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int prefixes[2];
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#if !USE_SNPRINTF
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size_t tmp_length;
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CHAR_T tmpbuf[700];
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CHAR_T *tmp;
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/* Allocate a temporary buffer of sufficient size for calling
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sprintf. */
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{
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size_t width;
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size_t precision;
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width = 0;
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if (dp->width_start != dp->width_end)
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{
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if (dp->width_arg_index != ARG_NONE)
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{
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int arg;
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if (!(a.arg[dp->width_arg_index].type == TYPE_INT))
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abort ();
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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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}
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else
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{
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const CHAR_T *digitp = dp->width_start;
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do
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width = xsum (xtimes (width, 10), *digitp++ - '0');
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while (digitp != dp->width_end);
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}
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}
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precision = 6;
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if (dp->precision_start != dp->precision_end)
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{
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if (dp->precision_arg_index != ARG_NONE)
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{
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int arg;
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if (!(a.arg[dp->precision_arg_index].type == TYPE_INT))
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abort ();
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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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}
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else
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{
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const CHAR_T *digitp = dp->precision_start + 1;
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precision = 0;
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while (digitp != dp->precision_end)
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precision = xsum (xtimes (precision, 10), *digitp++ - '0');
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}
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}
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switch (dp->conversion)
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{
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case 'd': case 'i': case 'u':
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# ifdef HAVE_LONG_LONG_INT
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if (type == TYPE_LONGLONGINT || type == TYPE_ULONGLONGINT)
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tmp_length =
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(unsigned int) (sizeof (unsigned long long) * CHAR_BIT
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* 0.30103 /* binary -> decimal */
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)
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+ 1; /* turn floor into ceil */
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else
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# endif
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if (type == TYPE_LONGINT || type == TYPE_ULONGINT)
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tmp_length =
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(unsigned int) (sizeof (unsigned long) * CHAR_BIT
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* 0.30103 /* binary -> decimal */
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)
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+ 1; /* turn floor into ceil */
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else
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tmp_length =
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(unsigned int) (sizeof (unsigned int) * CHAR_BIT
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* 0.30103 /* binary -> decimal */
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)
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+ 1; /* turn floor into ceil */
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if (tmp_length < precision)
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tmp_length = precision;
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/* Multiply by 2, as an estimate for FLAG_GROUP. */
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tmp_length = xsum (tmp_length, tmp_length);
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/* Add 1, to account for a leading sign. */
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tmp_length = xsum (tmp_length, 1);
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break;
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case 'o':
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# ifdef HAVE_LONG_LONG_INT
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if (type == TYPE_LONGLONGINT || type == TYPE_ULONGLONGINT)
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tmp_length =
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(unsigned int) (sizeof (unsigned long long) * CHAR_BIT
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* 0.333334 /* binary -> octal */
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)
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+ 1; /* turn floor into ceil */
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else
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# endif
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if (type == TYPE_LONGINT || type == TYPE_ULONGINT)
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tmp_length =
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(unsigned int) (sizeof (unsigned long) * CHAR_BIT
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* 0.333334 /* binary -> octal */
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)
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+ 1; /* turn floor into ceil */
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else
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tmp_length =
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(unsigned int) (sizeof (unsigned int) * CHAR_BIT
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* 0.333334 /* binary -> octal */
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)
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+ 1; /* turn floor into ceil */
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if (tmp_length < precision)
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tmp_length = precision;
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/* Add 1, to account for a leading sign. */
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tmp_length = xsum (tmp_length, 1);
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break;
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case 'x': case 'X':
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# ifdef HAVE_LONG_LONG_INT
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if (type == TYPE_LONGLONGINT || type == TYPE_ULONGLONGINT)
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tmp_length =
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(unsigned int) (sizeof (unsigned long long) * CHAR_BIT
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* 0.25 /* binary -> hexadecimal */
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)
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+ 1; /* turn floor into ceil */
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else
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# endif
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if (type == TYPE_LONGINT || type == TYPE_ULONGINT)
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tmp_length =
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(unsigned int) (sizeof (unsigned long) * CHAR_BIT
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* 0.25 /* binary -> hexadecimal */
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)
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+ 1; /* turn floor into ceil */
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else
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tmp_length =
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(unsigned int) (sizeof (unsigned int) * CHAR_BIT
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* 0.25 /* binary -> hexadecimal */
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)
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+ 1; /* turn floor into ceil */
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if (tmp_length < precision)
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tmp_length = precision;
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/* Add 2, to account for a leading sign or alternate form. */
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tmp_length = xsum (tmp_length, 2);
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break;
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|
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case 'f': case 'F':
|
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# ifdef HAVE_LONG_DOUBLE
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if (type == TYPE_LONGDOUBLE)
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tmp_length =
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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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)
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+ 1 /* turn floor into ceil */
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+ 10; /* sign, decimal point etc. */
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else
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# endif
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tmp_length =
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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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)
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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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break;
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|
|
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case 'e': case 'E': case 'g': case 'G':
|
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case 'a': case 'A':
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tmp_length =
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12; /* sign, decimal point, exponent etc. */
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tmp_length = xsum (tmp_length, precision);
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break;
|
|
|
|
case 'c':
|
|
# if defined HAVE_WINT_T && !WIDE_CHAR_VERSION
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|
if (type == TYPE_WIDE_CHAR)
|
|
tmp_length = MB_CUR_MAX;
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|
else
|
|
# endif
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tmp_length = 1;
|
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break;
|
|
|
|
case 's':
|
|
# ifdef HAVE_WCHAR_T
|
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if (type == TYPE_WIDE_STRING)
|
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{
|
|
tmp_length =
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local_wcslen (a.arg[dp->arg_index].a.a_wide_string);
|
|
|
|
# if !WIDE_CHAR_VERSION
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|
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 =
|
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(unsigned int) (sizeof (void *) * CHAR_BIT
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|
* 0.25 /* binary -> hexadecimal */
|
|
)
|
|
+ 1 /* turn floor into ceil */
|
|
+ 2; /* account for leading 0x */
|
|
break;
|
|
|
|
default:
|
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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
|