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Annotation of mandoc/compat_vasprintf.c, Revision 1.1

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