f582340a6a
Fix the handle locking in stdio to use flockfile/funlockfile internally when and where required. Macros in <stdio.h> are updated to automatically call the underlying functions when the process is threaded to obtain the necessary locking. A private mutex is added to protect __sglue, the internal list of FILE handles, and another to protect the one-time initialization. Some routines in libc that use getc() change to use getc_unlocked() as they're either protected by their own lock or aren't thread-safe routines anyway. Based on OpenBSD change by guenther@openbsd.org http://www.mail-archive.com/source-changes@cvs.openbsd.org/msg01015.html Bug: 3446659 Change-Id: Ie82116e358c541718d6709ec45ca6796be5a007b
58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/* $OpenBSD: asprintf.c,v 1.15 2005/10/10 12:00:52 espie Exp $ */
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/*
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* Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <stdarg.h>
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#include "local.h"
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int
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asprintf(char **str, const char *fmt, ...)
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{
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int ret;
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va_list ap;
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FILE f;
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unsigned char *_base;
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f._file = -1;
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f._flags = __SWR | __SSTR | __SALC;
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f._bf._base = f._p = (unsigned char *)malloc(128);
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if (f._bf._base == NULL)
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goto err;
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f._bf._size = f._w = 127; /* Leave room for the NUL */
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va_start(ap, fmt);
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ret = __vfprintf(&f, fmt, ap);
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va_end(ap);
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if (ret == -1)
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goto err;
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*f._p = '\0';
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_base = realloc(f._bf._base, ret + 1);
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if (_base == NULL)
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goto err;
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*str = (char *)_base;
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return (ret);
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err:
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free(f._bf._base);
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*str = NULL;
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errno = ENOMEM;
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return (-1);
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}
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