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18bf00f312
Unlike vsnprintf, vswprintf does not properly initialize locking elements of FILE structure, which in some unfortunate cases can result in lockups in _vfwprintf_internal. Interesting, the initialization code was removed in 2a915734a32c5aec9a6a76c13bcb074d30e64171 at the same time as it was added to vsnprintf. Signed-off-by: Maksim Rayskiy <mrayskiy@broadcom.com> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
/* Copyright (C) 2004 Manuel Novoa III <mjn3@codepoet.org>
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*
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* GNU Library General Public License (LGPL) version 2 or later.
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*
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* Dedicated to Toni. See uClibc/DEDICATION.mjn3 for details.
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*/
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#include "_stdio.h"
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#include <stdarg.h>
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#include <wchar.h>
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/* NB: this file is not used if __USE_OLD_VFPRINTF__ */
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#ifndef __STDIO_BUFFERS
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#warning Skipping vswprintf since no buffering!
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#else /* __STDIO_BUFFERS */
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int vswprintf(wchar_t *__restrict buf, size_t size,
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const wchar_t * __restrict format, va_list arg)
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{
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FILE f;
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int rv;
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/* __STDIO_STREAM_RESET_GCS(&f); */
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#ifdef __UCLIBC_HAS_GLIBC_CUSTOM_STREAMS__
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f.__cookie = &(f.__filedes);
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f.__gcs.read = NULL;
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f.__gcs.write = NULL;
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f.__gcs.seek = NULL;
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f.__gcs.close = NULL;
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#endif
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f.__filedes = __STDIO_STREAM_FAKE_VSWPRINTF_FILEDES;
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f.__modeflags = (__FLAG_WIDE|__FLAG_WRITEONLY|__FLAG_WRITING);
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f.__ungot_width[0] = 0;
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#ifdef __STDIO_MBSTATE
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__INIT_MBSTATE(&(f.__state));
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#endif /* __STDIO_MBSTATE */
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#ifdef __UCLIBC_HAS_THREADS__
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f.__user_locking = 1; /* Set user locking. */
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STDIO_INIT_MUTEX(f.__lock);
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#endif /* __UCLIBC_HAS_THREADS__ */
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f.__nextopen = NULL;
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if (size > ((SIZE_MAX - (size_t) buf)/sizeof(wchar_t))) {
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size = ((SIZE_MAX - (size_t) buf)/sizeof(wchar_t));
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}
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f.__bufstart = (unsigned char *) buf;
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f.__bufend = (unsigned char *) (buf + size);
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__STDIO_STREAM_INIT_BUFREAD_BUFPOS(&f);
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__STDIO_STREAM_DISABLE_GETC(&f);
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__STDIO_STREAM_DISABLE_PUTC(&f);
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rv = _vfwprintf_internal(&f, format, arg);
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/* NOTE: Return behaviour differs from snprintf... */
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if (f.__bufpos == f.__bufend) {
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rv = -1;
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if (size) {
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f.__bufpos = (unsigned char *) (((wchar_t *) f.__bufpos) - 1);
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}
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}
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if (size) {
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*((wchar_t *) f.__bufpos) = 0;
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}
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return rv;
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}
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libc_hidden_def(vswprintf)
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#endif /* __STDIO_BUFFERS */
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