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90 lines
1.8 KiB
C
90 lines
1.8 KiB
C
/* $Id: asprintf.c,v 1.4 2008-09-26 06:45:28 nicm Exp $ */
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/*
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* Copyright (c) 2006 Nicholas Marriott <nicm@users.sourceforge.net>
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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 MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include "tmux.h"
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int
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asprintf(char **ret, const char *format, ...)
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{
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va_list ap;
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int n;
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va_start(ap, format);
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n = vasprintf(ret, format, ap);
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va_end(ap);
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return (n);
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}
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#ifndef BROKEN_VSNPRINTF
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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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int n;
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if ((n = vsnprintf(NULL, 0, format, ap)) < 0)
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goto error;
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*ret = xmalloc(n + 1);
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if ((n = vsnprintf(*ret, n + 1, format, ap)) < 0) {
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xfree(*ret);
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goto error;
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}
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return (n);
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error:
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*ret = NULL;
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return (-1);
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}
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#else
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int
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vasprintf(char **ret, const char *fmt, va_list ap)
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{
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va_list aq;
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size_t len;
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char *buf;
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int n;
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len = 64;
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buf = xmalloc(len);
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for (;;) {
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va_copy(aq, ap);
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n = vsnprintf(buf, len, fmt, aq);
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va_end(aq);
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if (n != -1) {
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*ret = buf;
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return (n);
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}
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if (len > SIZE_MAX / 2) {
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xfree(buf);
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return (-1);
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}
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len *= 2;
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}
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}
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#endif
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