48 lines
1.5 KiB
C
48 lines
1.5 KiB
C
/* $Id: compat_vasprintf.c,v 1.4 2020/06/15 01:37:15 schwarze Exp $ */
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/*
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* Copyright (c) 2015 Ingo Schwarze <schwarze@openbsd.org>
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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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* This fallback implementation is not efficient:
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* It does the formatting twice.
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* Short of fiddling with the unknown internals of the system's
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* printf(3) or completely reimplementing printf(3), i can't think
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* of another portable solution.
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*/
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#include "config.h"
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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int
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vasprintf(char **ret, const char *format, va_list ap)
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{
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char buf[2];
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va_list ap2;
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int sz;
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va_copy(ap2, ap);
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sz = vsnprintf(buf, sizeof(buf), format, ap2);
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va_end(ap2);
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if (sz != -1 && (*ret = malloc(sz + 1)) != NULL) {
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if (vsnprintf(*ret, sz + 1, format, ap) == sz)
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return sz;
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free(*ret);
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}
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*ret = NULL;
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return -1;
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}
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