nasmlib/asprintf.c

/* ----------------------------------------------------------------------- *
 *
 *   Copyright 1996-2018 The NASM Authors - All Rights Reserved
 *   See the file AUTHORS included with the NASM distribution for
 *   the specific copyright holders.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following
 *   conditions are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.
 *
 *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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 *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 * ----------------------------------------------------------------------- */

#include "compiler.h"
#include "nasmlib.h"
#include "alloc.h"

char *nasm_vasprintf(const char *fmt, va_list ap)
{
#ifdef HAVE_VASPRINTF
    char *strp;
    int rv = vasprintf(&strp, fmt, ap);
    if (rv < 0)
        nasm_alloc_failed();
    return strp;
#else
    char *strp;
    va_list xap;
    int len;

    va_copy(xap, ap);
    len = vsnprintf(NULL, 0, fmt, xap);
    va_end(xap);
    strp = nasm_malloc(len+1);
    vsnprintf(strp, len, fmt, ap);
    return strp;
#endif
}

char *nasm_asprintf(const char *fmt, ...)
{
    va_list ap;
    char *strp;

    va_start(ap, fmt);
    strp = nasm_vasprintf(fmt, ap);
    va_end(ap);

    return strp;
}