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-rw-r--r--lib/vasnprintf.c504
1 files changed, 374 insertions, 130 deletions
diff --git a/lib/vasnprintf.c b/lib/vasnprintf.c
index 42c48729..48574524 100644
--- a/lib/vasnprintf.c
+++ b/lib/vasnprintf.c
@@ -1,27 +1,18 @@
/* vsprintf with automatic memory allocation.
- Copyright (C) 1999, 2002-2018 Free Software Foundation, Inc.
+ Copyright (C) 1999, 2002-2022 Free Software Foundation, Inc.
- This program is free software: you can redistribute it and/or
- modify it under the terms of either:
+ This file is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
- * the GNU Lesser General Public License as published by the Free
- Software Foundation; either version 3 of the License, or (at your
- option) any later version.
-
- or
-
- * the GNU General Public License as published by the Free
- Software Foundation; either version 2 of the License, or (at your
- option) any later version.
-
- or both in parallel, as here.
- This program is distributed in the hope that it will be useful,
+ This file 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.
+ GNU Lesser General Public License for more details.
- You should have received a copy of the GNU General Public License along
- with this program; if not, see <https://www.gnu.org/licenses/>. */
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* This file can be parametrized with the following macros:
VASNPRINTF The name of the function being defined.
@@ -50,7 +41,14 @@
DCHAR_CONV_FROM_ENCODING A function to convert from char[] to DCHAR[].
DCHAR_IS_UINT8_T Set to 1 if DCHAR_T is uint8_t.
DCHAR_IS_UINT16_T Set to 1 if DCHAR_T is uint16_t.
- DCHAR_IS_UINT32_T Set to 1 if DCHAR_T is uint32_t. */
+ DCHAR_IS_UINT32_T Set to 1 if DCHAR_T is uint32_t.
+ ENABLE_UNISTDIO Set to 1 to enable the unistdio extensions.
+ ENABLE_WCHAR_FALLBACK Set to 1 to avoid EILSEQ during conversion of wide
+ characters (wchar_t) and wide character strings
+ (wchar_t[]) to multibyte sequences. The fallback is the
+ hexadecimal escape syntax (\unnnn or \Unnnnnnnn) or,
+ if wchar_t is not Unicode encoded, \wnnnn or \Wnnnnnnnn.
+ */
/* Tell glibc's <stdio.h> to provide a prototype for snprintf().
This must come before <config.h> because <config.h> may include
@@ -62,10 +60,16 @@
#ifndef VASNPRINTF
# include <config.h>
#endif
-#ifndef IN_LIBINTL
-# include <alloca.h>
+
+/* As of GCC 11.2.1, gcc -Wanalyzer-too-complex reports that main's
+ use of CHECK macros expands to code that is too complicated for gcc
+ -fanalyzer. Suppress the resulting bogus warnings. */
+#if 10 <= __GNUC__
+# pragma GCC diagnostic ignored "-Wanalyzer-null-argument"
#endif
+#include <alloca.h>
+
/* Specification. */
#ifndef VASNPRINTF
# if WIDE_CHAR_VERSION
@@ -96,6 +100,7 @@
/* Checked size_t computations. */
#include "xsize.h"
+#include "attribute.h"
#include "verify.h"
#if (NEED_PRINTF_DOUBLE || NEED_PRINTF_LONG_DOUBLE) && !defined IN_LIBINTL
@@ -127,14 +132,6 @@
# include "fpucw.h"
#endif
-#ifndef FALLTHROUGH
-# if __GNUC__ < 7
-# define FALLTHROUGH ((void) 0)
-# else
-# define FALLTHROUGH __attribute__ ((__fallthrough__))
-# endif
-#endif
-
/* Default parameters. */
#ifndef VASNPRINTF
# if WIDE_CHAR_VERSION
@@ -286,6 +283,74 @@ local_wcsnlen (const wchar_t *s, size_t maxlen)
# endif
#endif
+#if (((!USE_SNPRINTF || !HAVE_SNPRINTF_RETVAL_C99 || USE_MSVC__SNPRINTF || (NEED_PRINTF_DIRECTIVE_LS && !defined IN_LIBINTL) || ENABLE_WCHAR_FALLBACK) && HAVE_WCHAR_T) || (ENABLE_WCHAR_FALLBACK && HAVE_WINT_T)) && !WIDE_CHAR_VERSION
+# if ENABLE_WCHAR_FALLBACK
+static size_t
+wctomb_fallback (char *s, wchar_t wc)
+{
+ static char hex[16] = "0123456789ABCDEF";
+
+ s[0] = '\\';
+ if (sizeof (wchar_t) > 2 && wc > 0xffff)
+ {
+# if __STDC_ISO_10646__ || (__GLIBC__ >= 2) || (defined _WIN32 || defined __CYGWIN__)
+ s[1] = 'U';
+# else
+ s[1] = 'W';
+# endif
+ s[2] = hex[(wc & 0xf0000000U) >> 28];
+ s[3] = hex[(wc & 0xf000000U) >> 24];
+ s[4] = hex[(wc & 0xf00000U) >> 20];
+ s[5] = hex[(wc & 0xf0000U) >> 16];
+ s[6] = hex[(wc & 0xf000U) >> 12];
+ s[7] = hex[(wc & 0xf00U) >> 8];
+ s[8] = hex[(wc & 0xf0U) >> 4];
+ s[9] = hex[wc & 0xfU];
+ return 10;
+ }
+ else
+ {
+# if __STDC_ISO_10646__ || (__GLIBC__ >= 2) || (defined _WIN32 || defined __CYGWIN__)
+ s[1] = 'u';
+# else
+ s[1] = 'w';
+# endif
+ s[2] = hex[(wc & 0xf000U) >> 12];
+ s[3] = hex[(wc & 0xf00U) >> 8];
+ s[4] = hex[(wc & 0xf0U) >> 4];
+ s[5] = hex[wc & 0xfU];
+ return 6;
+ }
+}
+# if HAVE_WCRTOMB && !defined GNULIB_defined_mbstate_t
+static size_t
+local_wcrtomb (char *s, wchar_t wc, mbstate_t *ps)
+{
+ size_t count = wcrtomb (s, wc, ps);
+ if (count == (size_t)(-1))
+ count = wctomb_fallback (s, wc);
+ return count;
+}
+# else
+static int
+local_wctomb (char *s, wchar_t wc)
+{
+ int count = wctomb (s, wc);
+ if (count < 0)
+ count = wctomb_fallback (s, wc);
+ return count;
+}
+# define local_wcrtomb(S, WC, PS) local_wctomb ((S), (WC))
+# endif
+# else
+# if HAVE_WCRTOMB && !defined GNULIB_defined_mbstate_t
+# define local_wcrtomb(S, WC, PS) wcrtomb ((S), (WC), (PS))
+# else
+# define local_wcrtomb(S, WC, PS) wctomb ((S), (WC))
+# endif
+# endif
+#endif
+
#if (NEED_PRINTF_DIRECTIVE_A || NEED_PRINTF_LONG_DOUBLE || NEED_PRINTF_INFINITE_LONG_DOUBLE || NEED_PRINTF_DOUBLE || NEED_PRINTF_INFINITE_DOUBLE) && !defined IN_LIBINTL
/* Determine the decimal-point character according to the current locale. */
# ifndef decimal_point_char_defined
@@ -574,7 +639,8 @@ divide (mpn_t a, mpn_t b, mpn_t *q)
mp_limb_t msd = b_ptr[b_len - 1]; /* = b[n-1], > 0 */
/* Determine s = GMP_LIMB_BITS - integer_length (msd).
Code copied from gnulib's integer_length.c. */
-# if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
+# if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) \
+ || (__clang_major__ >= 4)
s = __builtin_clz (msd);
# else
# if defined DBL_EXPBIT0_WORD && defined DBL_EXPBIT0_BIT
@@ -869,7 +935,9 @@ convert_to_decimal (mpn_t a, size_t extra_zeroes)
size_t a_len = a.nlimbs;
/* 0.03345 is slightly larger than log(2)/(9*log(10)). */
size_t c_len = 9 * ((size_t)(a_len * (GMP_LIMB_BITS * 0.03345f)) + 1);
- char *c_ptr = (char *) malloc (xsum (c_len, extra_zeroes));
+ /* We need extra_zeroes bytes for zeroes, followed by c_len bytes for the
+ digits of a, followed by 1 byte for the terminating NUL. */
+ char *c_ptr = (char *) malloc (xsum (xsum (extra_zeroes, c_len), 1));
if (c_ptr != NULL)
{
char *d_ptr = c_ptr;
@@ -1560,16 +1628,13 @@ MAX_ROOM_NEEDED (const arguments *ap, size_t arg_index, FCHAR_T conversion,
switch (conversion)
{
case 'd': case 'i': case 'u':
-# if 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)
+ else if (type == TYPE_LONGINT || type == TYPE_ULONGINT)
tmp_length =
(unsigned int) (sizeof (unsigned long) * CHAR_BIT
* 0.30103 /* binary -> decimal */
@@ -1590,16 +1655,13 @@ MAX_ROOM_NEEDED (const arguments *ap, size_t arg_index, FCHAR_T conversion,
break;
case 'o':
-# if 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)
+ else if (type == TYPE_LONGINT || type == TYPE_ULONGINT)
tmp_length =
(unsigned int) (sizeof (unsigned long) * CHAR_BIT
* 0.333334 /* binary -> octal */
@@ -1618,16 +1680,13 @@ MAX_ROOM_NEEDED (const arguments *ap, size_t arg_index, FCHAR_T conversion,
break;
case 'x': case 'X':
-# if 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)
+ else if (type == TYPE_LONGINT || type == TYPE_ULONGINT)
tmp_length =
(unsigned int) (sizeof (unsigned long) * CHAR_BIT
* 0.25 /* binary -> hexadecimal */
@@ -1693,7 +1752,13 @@ MAX_ROOM_NEEDED (const arguments *ap, size_t arg_index, FCHAR_T conversion,
case 'c':
# if HAVE_WINT_T && !WIDE_CHAR_VERSION
if (type == TYPE_WIDE_CHAR)
- tmp_length = MB_CUR_MAX;
+ {
+ tmp_length = MB_CUR_MAX;
+# if ENABLE_WCHAR_FALLBACK
+ if (tmp_length < (sizeof (wchar_t) > 2 ? 10 : 6))
+ tmp_length = (sizeof (wchar_t) > 2 ? 10 : 6);
+# endif
+ }
else
# endif
tmp_length = 1;
@@ -1800,6 +1865,7 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
/* errno is already set. */
return NULL;
+ /* Frees the memory allocated by this function. Preserves errno. */
#define CLEANUP() \
if (d.dir != d.direct_alloc_dir) \
free (d.dir); \
@@ -1864,7 +1930,7 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
/* 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) \
+#define ENSURE_ALLOCATION_ELSE(needed, oom_statement) \
if ((needed) > allocated) \
{ \
size_t memory_size; \
@@ -1875,17 +1941,19 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
allocated = (needed); \
memory_size = xtimes (allocated, sizeof (DCHAR_T)); \
if (size_overflow_p (memory_size)) \
- goto out_of_memory; \
+ oom_statement \
if (result == resultbuf || result == NULL) \
memory = (DCHAR_T *) malloc (memory_size); \
else \
memory = (DCHAR_T *) realloc (result, memory_size); \
if (memory == NULL) \
- goto out_of_memory; \
+ oom_statement \
if (result == resultbuf && length > 0) \
DCHAR_CPY (memory, result, length); \
result = memory; \
}
+#define ENSURE_ALLOCATION(needed) \
+ ENSURE_ALLOCATION_ELSE((needed), goto out_of_memory; )
for (cp = format, i = 0, dp = &d.dir[0]; ; cp = dp->dir_end, i++, dp++)
{
@@ -1946,11 +2014,9 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
case TYPE_COUNT_LONGINT_POINTER:
*a.arg[dp->arg_index].a.a_count_longint_pointer = length;
break;
-#if HAVE_LONG_LONG_INT
case TYPE_COUNT_LONGLONGINT_POINTER:
*a.arg[dp->arg_index].a.a_count_longlongint_pointer = length;
break;
-#endif
default:
abort ();
}
@@ -2126,18 +2192,17 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
# endif
if (converted == NULL)
{
- int saved_errno = errno;
if (!(result == resultbuf || result == NULL))
free (result);
if (buf_malloced != NULL)
free (buf_malloced);
CLEANUP ();
- errno = saved_errno;
return NULL;
}
if (converted != result + length)
{
- ENSURE_ALLOCATION (xsum (length, converted_len));
+ ENSURE_ALLOCATION_ELSE (xsum (length, converted_len),
+ { free (converted); goto out_of_memory; });
DCHAR_CPY (result + length, converted, converted_len);
free (converted);
}
@@ -2252,18 +2317,17 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
# endif
if (converted == NULL)
{
- int saved_errno = errno;
if (!(result == resultbuf || result == NULL))
free (result);
if (buf_malloced != NULL)
free (buf_malloced);
CLEANUP ();
- errno = saved_errno;
return NULL;
}
if (converted != result + length)
{
- ENSURE_ALLOCATION (xsum (length, converted_len));
+ ENSURE_ALLOCATION_ELSE (xsum (length, converted_len),
+ { free (converted); goto out_of_memory; });
DCHAR_CPY (result + length, converted, converted_len);
free (converted);
}
@@ -2378,18 +2442,17 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
# endif
if (converted == NULL)
{
- int saved_errno = errno;
if (!(result == resultbuf || result == NULL))
free (result);
if (buf_malloced != NULL)
free (buf_malloced);
CLEANUP ();
- errno = saved_errno;
return NULL;
}
if (converted != result + length)
{
- ENSURE_ALLOCATION (xsum (length, converted_len));
+ ENSURE_ALLOCATION_ELSE (xsum (length, converted_len),
+ { free (converted); goto out_of_memory; });
DCHAR_CPY (result + length, converted, converted_len);
free (converted);
}
@@ -2412,7 +2475,7 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
}
}
#endif
-#if (!USE_SNPRINTF || !HAVE_SNPRINTF_RETVAL_C99 || USE_MSVC__SNPRINTF || (NEED_PRINTF_DIRECTIVE_LS && !defined IN_LIBINTL)) && HAVE_WCHAR_T
+#if (!USE_SNPRINTF || !HAVE_SNPRINTF_RETVAL_C99 || USE_MSVC__SNPRINTF || (NEED_PRINTF_DIRECTIVE_LS && !defined IN_LIBINTL) || ENABLE_WCHAR_FALLBACK) && HAVE_WCHAR_T
else if (dp->conversion == 's'
# if WIDE_CHAR_VERSION
&& a.arg[dp->arg_index].type != TYPE_WIDE_STRING
@@ -2687,11 +2750,7 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
if (*arg_end == 0)
/* Found the terminating null wide character. */
break;
-# if HAVE_WCRTOMB && !defined GNULIB_defined_mbstate_t
- count = wcrtomb (cbuf, *arg_end, &state);
-# else
- count = wctomb (cbuf, *arg_end);
-# endif
+ count = local_wcrtomb (cbuf, *arg_end, &state);
if (count < 0)
{
/* Cannot convert. */
@@ -2703,7 +2762,7 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
errno = EILSEQ;
return NULL;
}
- if (precision < count)
+ if (precision < (unsigned int) count)
break;
arg_end++;
characters += count;
@@ -2732,11 +2791,7 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
if (*arg_end == 0)
/* Found the terminating null wide character. */
break;
-# if HAVE_WCRTOMB && !defined GNULIB_defined_mbstate_t
- count = wcrtomb (cbuf, *arg_end, &state);
-# else
- count = wctomb (cbuf, *arg_end);
-# endif
+ count = local_wcrtomb (cbuf, *arg_end, &state);
if (count < 0)
{
/* Cannot convert. */
@@ -2781,11 +2836,7 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
if (*arg == 0)
abort ();
-# if HAVE_WCRTOMB && !defined GNULIB_defined_mbstate_t
- count = wcrtomb (cbuf, *arg, &state);
-# else
- count = wctomb (cbuf, *arg);
-# endif
+ count = local_wcrtomb (cbuf, *arg, &state);
if (count <= 0)
/* Inconsistency. */
abort ();
@@ -2807,14 +2858,12 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
NULL, &tmpdst_len);
if (tmpdst == NULL)
{
- int saved_errno = errno;
free (tmpsrc);
if (!(result == resultbuf || result == NULL))
free (result);
if (buf_malloced != NULL)
free (buf_malloced);
CLEANUP ();
- errno = saved_errno;
return NULL;
}
free (tmpsrc);
@@ -2862,11 +2911,7 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
if (*arg == 0)
abort ();
-# if HAVE_WCRTOMB && !defined GNULIB_defined_mbstate_t
- count = wcrtomb (cbuf, *arg, &state);
-# else
- count = wctomb (cbuf, *arg);
-# endif
+ count = local_wcrtomb (cbuf, *arg, &state);
if (count <= 0)
/* Inconsistency. */
abort ();
@@ -2891,11 +2936,7 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
if (*arg == 0)
abort ();
-# if HAVE_WCRTOMB && !defined GNULIB_defined_mbstate_t
- count = wcrtomb (cbuf, *arg, &state);
-# else
- count = wctomb (cbuf, *arg);
-# endif
+ count = local_wcrtomb (cbuf, *arg, &state);
if (count <= 0)
{
/* Cannot convert. */
@@ -2914,7 +2955,8 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
}
}
# else
- ENSURE_ALLOCATION (xsum (length, tmpdst_len));
+ ENSURE_ALLOCATION_ELSE (xsum (length, tmpdst_len),
+ { free (tmpdst); goto out_of_memory; });
DCHAR_CPY (result + length, tmpdst, tmpdst_len);
free (tmpdst);
length += tmpdst_len;
@@ -2931,6 +2973,209 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
# endif
}
#endif
+#if ENABLE_WCHAR_FALLBACK && HAVE_WINT_T && !WIDE_CHAR_VERSION
+ else if (dp->conversion == 'c'
+ && a.arg[dp->arg_index].type == TYPE_WIDE_CHAR)
+ {
+ /* Implement the 'lc' directive ourselves, in order to provide
+ the fallback that avoids EILSEQ. */
+ int flags = dp->flags;
+ int has_width;
+ size_t width;
+
+ has_width = 0;
+ 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;
+ if (arg < 0)
+ {
+ /* "A negative field width is taken as a '-' flag
+ followed by a positive field width." */
+ flags |= FLAG_LEFT;
+ width = -width;
+ }
+ }
+ else
+ {
+ const FCHAR_T *digitp = dp->width_start;
+
+ do
+ width = xsum (xtimes (width, 10), *digitp++ - '0');
+ while (digitp != dp->width_end);
+ }
+ has_width = 1;
+ }
+
+ /* %lc in vasnprintf. See the specification of fprintf. */
+ {
+ wchar_t arg = (wchar_t) a.arg[dp->arg_index].a.a_wide_char;
+ size_t characters;
+# if !DCHAR_IS_TCHAR
+ /* This code assumes that TCHAR_T is 'char'. */
+ verify (sizeof (TCHAR_T) == 1);
+ TCHAR_T tmpsrc[64]; /* Assume MB_CUR_MAX <= 64. */
+ DCHAR_T *tmpdst;
+ size_t tmpdst_len;
+# endif
+ size_t w;
+
+# if DCHAR_IS_TCHAR
+ if (has_width)
+# endif
+ {
+ /* Count the number of bytes. */
+ characters = 0;
+ if (arg != 0)
+ {
+ char cbuf[64]; /* Assume MB_CUR_MAX <= 64. */
+ int count;
+# if HAVE_WCRTOMB && !defined GNULIB_defined_mbstate_t
+ mbstate_t state;
+ memset (&state, '\0', sizeof (mbstate_t));
+# endif
+
+ count = local_wcrtomb (cbuf, arg, &state);
+ if (count < 0)
+ /* Inconsistency. */
+ abort ();
+ characters = count;
+ }
+ }
+# if DCHAR_IS_TCHAR
+ else
+ {
+ /* The number of bytes doesn't matter. */
+ characters = 0;
+ }
+# endif
+
+# if !DCHAR_IS_TCHAR
+ /* Convert the string into a piece of temporary memory. */
+ if (characters > 0) /* implies arg != 0 */
+ {
+ char cbuf[64]; /* Assume MB_CUR_MAX <= 64. */
+ int count;
+# if HAVE_WCRTOMB && !defined GNULIB_defined_mbstate_t
+ mbstate_t state;
+ memset (&state, '\0', sizeof (mbstate_t));
+# endif
+
+ count = local_wcrtomb (cbuf, arg, &state);
+ if (count <= 0)
+ /* Inconsistency. */
+ abort ();
+ memcpy (tmpsrc, cbuf, count);
+ }
+
+ /* Convert from TCHAR_T[] to DCHAR_T[]. */
+ tmpdst =
+ DCHAR_CONV_FROM_ENCODING (locale_charset (),
+ iconveh_question_mark,
+ tmpsrc, characters,
+ NULL,
+ NULL, &tmpdst_len);
+ if (tmpdst == NULL)
+ {
+ if (!(result == resultbuf || result == NULL))
+ free (result);
+ if (buf_malloced != NULL)
+ free (buf_malloced);
+ CLEANUP ();
+ return NULL;
+ }
+# endif
+
+ if (has_width)
+ {
+# if ENABLE_UNISTDIO
+ /* Outside POSIX, it's preferable to compare the width
+ against the number of _characters_ of the converted
+ value. */
+ w = DCHAR_MBSNLEN (result + length, characters);
+# else
+ /* The width is compared against the number of _bytes_
+ of the converted value, says POSIX. */
+ w = characters;
+# endif
+ }
+ else
+ /* w doesn't matter. */
+ w = 0;
+
+ if (w < width && !(dp->flags & FLAG_LEFT))
+ {
+ size_t n = width - w;
+ ENSURE_ALLOCATION (xsum (length, n));
+ DCHAR_SET (result + length, ' ', n);
+ length += n;
+ }
+
+# if DCHAR_IS_TCHAR
+ if (has_width)
+ {
+ /* We know the number of bytes in advance. */
+ ENSURE_ALLOCATION (xsum (length, characters));
+ if (characters > 0) /* implies arg != 0 */
+ {
+ int count;
+# if HAVE_WCRTOMB && !defined GNULIB_defined_mbstate_t
+ mbstate_t state;
+ memset (&state, '\0', sizeof (mbstate_t));
+# endif
+
+ count = local_wcrtomb (result + length, arg, &state);
+ if (count <= 0)
+ /* Inconsistency. */
+ abort ();
+ length += count;
+ }
+ }
+ else
+ {
+ if (arg != 0)
+ {
+ char cbuf[64]; /* Assume MB_CUR_MAX <= 64. */
+ int count;
+# if HAVE_WCRTOMB && !defined GNULIB_defined_mbstate_t
+ mbstate_t state;
+ memset (&state, '\0', sizeof (mbstate_t));
+# endif
+
+ count = local_wcrtomb (cbuf, arg, &state);
+ if (count <= 0)
+ /* Inconsistency. */
+ abort ();
+ ENSURE_ALLOCATION (xsum (length, count));
+ memcpy (result + length, cbuf, count);
+ length += count;
+ }
+ }
+# else
+ ENSURE_ALLOCATION_ELSE (xsum (length, tmpdst_len),
+ { free (tmpdst); goto out_of_memory; });
+ DCHAR_CPY (result + length, tmpdst, tmpdst_len);
+ free (tmpdst);
+ length += tmpdst_len;
+# endif
+
+ if (w < width && (dp->flags & FLAG_LEFT))
+ {
+ size_t n = width - w;
+ ENSURE_ALLOCATION (xsum (length, n));
+ DCHAR_SET (result + length, ' ', n);
+ length += n;
+ }
+ }
+ }
+#endif
#if (NEED_PRINTF_DIRECTIVE_A || NEED_PRINTF_LONG_DOUBLE || NEED_PRINTF_DOUBLE) && !defined IN_LIBINTL
else if ((dp->conversion == 'a' || dp->conversion == 'A')
# if !(NEED_PRINTF_DIRECTIVE_A || (NEED_PRINTF_LONG_DOUBLE && NEED_PRINTF_DOUBLE))
@@ -4842,17 +5087,15 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
switch (type)
{
-#if HAVE_LONG_LONG_INT
case TYPE_LONGLONGINT:
case TYPE_ULONGLONGINT:
-# if defined _WIN32 && ! defined __CYGWIN__
+#if defined _WIN32 && ! defined __CYGWIN__
*fbp++ = 'I';
*fbp++ = '6';
*fbp++ = '4';
break;
-# else
+#else
*fbp++ = 'l';
-# endif
#endif
FALLTHROUGH;
case TYPE_LONGINT:
@@ -4878,30 +5121,32 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
#endif
*fbp = dp->conversion;
#if USE_SNPRINTF
-# if ! (((__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)) \
- && !defined __UCLIBC__) \
- || (defined __APPLE__ && defined __MACH__) \
- || (defined _WIN32 && ! defined __CYGWIN__))
- fbp[1] = '%';
- fbp[2] = 'n';
- fbp[3] = '\0';
-# else
- /* On glibc2 systems from glibc >= 2.3 - probably also older
- ones - we know that snprintf's return value conforms to
- ISO C 99: the tests gl_SNPRINTF_RETVAL_C99 and
- gl_SNPRINTF_TRUNCATION_C99 pass.
- Therefore we can avoid using %n in this situation.
- On glibc2 systems from 2004-10-18 or newer, the use of %n
- in format strings in writable memory may crash the program
- (if compiled with _FORTIFY_SOURCE=2), so we should avoid it
- in this situation. */
- /* On Mac OS X 10.3 or newer, we know that snprintf's return
- value conforms to ISO C 99: the tests gl_SNPRINTF_RETVAL_C99
- and gl_SNPRINTF_TRUNCATION_C99 pass.
- Therefore we can avoid using %n in this situation.
- On Mac OS X 10.13 or newer, the use of %n in format strings
- in writable memory by default crashes the program, so we
- should avoid it in this situation. */
+# if ((HAVE_SNPRINTF_RETVAL_C99 && HAVE_SNPRINTF_TRUNCATION_C99) \
+ || ((__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)) \
+ && !defined __UCLIBC__) \
+ || (defined __APPLE__ && defined __MACH__) \
+ || defined __ANDROID__ \
+ || (defined _WIN32 && ! defined __CYGWIN__))
+ /* On systems where we know that snprintf's return value
+ conforms to ISO C 99 (HAVE_SNPRINTF_RETVAL_C99) and that
+ snprintf always produces NUL-terminated strings
+ (HAVE_SNPRINTF_TRUNCATION_C99), it is possible to avoid
+ using %n. And it is desirable to do so, because more and
+ more platforms no longer support %n, for "security reasons".
+ In particular, the following platforms:
+ - On glibc2 systems from 2004-10-18 or newer, the use of
+ %n in format strings in writable memory may crash the
+ program (if compiled with _FORTIFY_SOURCE=2).
+ - On Mac OS X 10.13 or newer, the use of %n in format
+ strings in writable memory by default crashes the
+ program.
+ - On Android, starting on 2018-03-07, the use of %n in
+ format strings produces a fatal error (see
+ <https://android.googlesource.com/platform/bionic/+/41398d03b7e8e0dfb951660ae713e682e9fc0336>).
+ On these platforms, HAVE_SNPRINTF_RETVAL_C99 and
+ HAVE_SNPRINTF_TRUNCATION_C99 are 1. We have listed them
+ explicitly in the condition above, in case of cross-
+ compilation (just to be sure). */
/* On native Windows systems (such as mingw), we can avoid using
%n because:
- Although the gl_SNPRINTF_TRUNCATION_C99 test fails,
@@ -4915,9 +5160,13 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
Windows Vista, the use of %n in format strings by default
crashes the program. See
<https://gcc.gnu.org/ml/gcc/2007-06/msg00122.html> and
- <https://msdn.microsoft.com/en-us/library/ms175782.aspx>
+ <https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/set-printf-count-output>
So we should avoid %n in this situation. */
fbp[1] = '\0';
+# else /* AIX <= 5.1, HP-UX, IRIX, OSF/1, Solaris <= 9, BeOS */
+ fbp[1] = '%';
+ fbp[2] = 'n';
+ fbp[3] = '\0';
# endif
#else
fbp[1] = '\0';
@@ -5061,7 +5310,6 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
SNPRINTF_BUF (arg);
}
break;
-#if HAVE_LONG_LONG_INT
case TYPE_LONGLONGINT:
{
long long int arg = a.arg[dp->arg_index].a.a_longlongint;
@@ -5074,7 +5322,6 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
SNPRINTF_BUF (arg);
}
break;
-#endif
case TYPE_DOUBLE:
{
double arg = a.arg[dp->arg_index].a.a_double;
@@ -5134,7 +5381,7 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
{
/* Verify that snprintf() has NUL-terminated its
result. */
- if (count < maxlen
+ if ((unsigned int) count < maxlen
&& ((TCHAR_T *) (result + length)) [count] != '\0')
abort ();
/* Portability hack. */
@@ -5206,15 +5453,14 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
/* Attempt to handle failure. */
if (count < 0)
{
- /* SNPRINTF or sprintf failed. Save and use the errno
- that it has set, if any. */
- int saved_errno = errno;
- if (saved_errno == 0)
+ /* SNPRINTF or sprintf failed. Use the errno that it
+ has set, if any. */
+ if (errno == 0)
{
if (dp->conversion == 'c' || dp->conversion == 's')
- saved_errno = EILSEQ;
+ errno = EILSEQ;
else
- saved_errno = EINVAL;
+ errno = EINVAL;
}
if (!(result == resultbuf || result == NULL))
@@ -5223,7 +5469,6 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
free (buf_malloced);
CLEANUP ();
- errno = saved_errno;
return NULL;
}
@@ -5359,16 +5604,15 @@ VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
NULL, &tmpdst_len);
if (tmpdst == NULL)
{
- int saved_errno = errno;
if (!(result == resultbuf || result == NULL))
free (result);
if (buf_malloced != NULL)
free (buf_malloced);
CLEANUP ();
- errno = saved_errno;
return NULL;
}
- ENSURE_ALLOCATION (xsum (length, tmpdst_len));
+ ENSURE_ALLOCATION_ELSE (xsum (length, tmpdst_len),
+ { free (tmpdst); goto out_of_memory; });
DCHAR_CPY (result + length, tmpdst, tmpdst_len);
free (tmpdst);
count = tmpdst_len;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-11 01:53:20 +0000