binutils-gdb/libiberty/asprintf.c

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/* Like sprintf but provides a pointer to malloc'd storage, which must
be freed by the caller.
Copyright (C) 1997, 2003 Free Software Foundation, Inc.
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Contributed by Cygnus Solutions.
This file is part of the libiberty library.
Libiberty is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
Libiberty 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with libiberty; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "ansidecl.h"
#include "libiberty.h"
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#ifdef ANSI_PROTOTYPES
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#include <stdarg.h>
#else
#include <varargs.h>
#endif
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/*
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@deftypefn Extension int asprintf (char **@var{resptr}, const char *@var{format}, ...)
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Like @code{sprintf}, but instead of passing a pointer to a buffer, you
pass a pointer to a pointer. This function will compute the size of
the buffer needed, allocate memory with @code{malloc}, and store a
pointer to the allocated memory in @code{*@var{resptr}}. The value
returned is the same as @code{sprintf} would return. If memory could
not be allocated, minus one is returned and @code{NULL} is stored in
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@code{*@var{resptr}}.
@end deftypefn
*/
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int
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asprintf VPARAMS ((char **buf, const char *fmt, ...))
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{
int status;
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VA_OPEN (ap, fmt);
VA_FIXEDARG (ap, char **, buf);
VA_FIXEDARG (ap, const char *, fmt);
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status = vasprintf (buf, fmt, ap);
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VA_CLOSE (ap);
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return status;
}