1*61d06d6bSBaptiste Daroussin #include "config.h" 2*61d06d6bSBaptiste Daroussin 3*61d06d6bSBaptiste Daroussin #if HAVE_VASPRINTF 4*61d06d6bSBaptiste Daroussin 5*61d06d6bSBaptiste Daroussin int dummy; 6*61d06d6bSBaptiste Daroussin 7*61d06d6bSBaptiste Daroussin #else 8*61d06d6bSBaptiste Daroussin 9*61d06d6bSBaptiste Daroussin /* $Id: compat_vasprintf.c,v 1.3 2015/10/06 18:32:19 schwarze Exp $ */ 10*61d06d6bSBaptiste Daroussin /* 11*61d06d6bSBaptiste Daroussin * Copyright (c) 2015 Ingo Schwarze <schwarze@openbsd.org> 12*61d06d6bSBaptiste Daroussin * 13*61d06d6bSBaptiste Daroussin * Permission to use, copy, modify, and distribute this software for any 14*61d06d6bSBaptiste Daroussin * purpose with or without fee is hereby granted, provided that the above 15*61d06d6bSBaptiste Daroussin * copyright notice and this permission notice appear in all copies. 16*61d06d6bSBaptiste Daroussin * 17*61d06d6bSBaptiste Daroussin * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 18*61d06d6bSBaptiste Daroussin * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 19*61d06d6bSBaptiste Daroussin * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 20*61d06d6bSBaptiste Daroussin * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 21*61d06d6bSBaptiste Daroussin * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 22*61d06d6bSBaptiste Daroussin * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 23*61d06d6bSBaptiste Daroussin * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 24*61d06d6bSBaptiste Daroussin * 25*61d06d6bSBaptiste Daroussin * This fallback implementation is not efficient: 26*61d06d6bSBaptiste Daroussin * It does the formatting twice. 27*61d06d6bSBaptiste Daroussin * Short of fiddling with the unknown internals of the system's 28*61d06d6bSBaptiste Daroussin * printf(3) or completely reimplementing printf(3), i can't think 29*61d06d6bSBaptiste Daroussin * of another portable solution. 30*61d06d6bSBaptiste Daroussin */ 31*61d06d6bSBaptiste Daroussin 32*61d06d6bSBaptiste Daroussin #include <stdarg.h> 33*61d06d6bSBaptiste Daroussin #include <stdio.h> 34*61d06d6bSBaptiste Daroussin #include <stdlib.h> 35*61d06d6bSBaptiste Daroussin 36*61d06d6bSBaptiste Daroussin int 37*61d06d6bSBaptiste Daroussin vasprintf(char **ret, const char *format, va_list ap) 38*61d06d6bSBaptiste Daroussin { 39*61d06d6bSBaptiste Daroussin char buf[2]; 40*61d06d6bSBaptiste Daroussin va_list ap2; 41*61d06d6bSBaptiste Daroussin int sz; 42*61d06d6bSBaptiste Daroussin 43*61d06d6bSBaptiste Daroussin va_copy(ap2, ap); 44*61d06d6bSBaptiste Daroussin sz = vsnprintf(buf, sizeof(buf), format, ap2); 45*61d06d6bSBaptiste Daroussin va_end(ap2); 46*61d06d6bSBaptiste Daroussin 47*61d06d6bSBaptiste Daroussin if (sz != -1 && (*ret = malloc(sz + 1)) != NULL) { 48*61d06d6bSBaptiste Daroussin if (vsnprintf(*ret, sz + 1, format, ap) == sz) 49*61d06d6bSBaptiste Daroussin return sz; 50*61d06d6bSBaptiste Daroussin free(*ret); 51*61d06d6bSBaptiste Daroussin } 52*61d06d6bSBaptiste Daroussin *ret = NULL; 53*61d06d6bSBaptiste Daroussin return -1; 54*61d06d6bSBaptiste Daroussin } 55*61d06d6bSBaptiste Daroussin 56*61d06d6bSBaptiste Daroussin #endif 57