70 lines
1.5 KiB
C
70 lines
1.5 KiB
C
/* Copyright (C) 2007, 2008 Eric Blake
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* Permission to use, copy, modify, and distribute this software
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* is freely granted, provided that this notice is preserved.
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*/
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/* This code was derived from asprintf.c */
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/* doc in viprintf.c */
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#include <_ansi.h>
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#include <reent.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <limits.h>
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#include <errno.h>
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#include "local.h"
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char *
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_vasniprintf_r (struct _reent *ptr,
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char *buf,
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size_t *lenp,
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const char *fmt,
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va_list ap)
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{
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int ret;
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FILE f;
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size_t len = *lenp;
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if (buf && len)
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{
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/* mark an existing buffer, but allow allocation of larger string */
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f._flags = __SWR | __SSTR | __SOPT;
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}
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else
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{
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/* mark a zero-length reallocatable buffer */
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f._flags = __SWR | __SSTR | __SMBF;
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len = 0;
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buf = NULL;
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}
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f._bf._base = f._p = (unsigned char *) buf;
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/* For now, inherit the 32-bit signed limit of FILE._bf._size.
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FIXME - it would be nice to rewrite sys/reent.h to support size_t
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for _size. */
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if (len > INT_MAX)
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{
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ptr->_errno = EOVERFLOW;
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return NULL;
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}
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f._bf._size = f._w = len;
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f._file = -1; /* No file. */
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ret = _svfiprintf_r (ptr, &f, fmt, ap);
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if (ret < 0)
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return NULL;
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*lenp = ret;
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*f._p = '\0';
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return (char *) f._bf._base;
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}
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#ifndef _REENT_ONLY
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char *
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vasniprintf (char *buf,
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size_t *lenp,
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const char *fmt,
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va_list ap)
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{
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return _vasniprintf_r (_REENT, buf, lenp, fmt, ap);
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}
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#endif /* ! _REENT_ONLY */
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