The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/libkern/asprintf.c

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    1 /*-
    2  * Copyright (c) 2013-2015 Sandvine Inc.  All rights reserved.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/malloc.h>
   33 
   34 #include <machine/stdarg.h>
   35 
   36 int
   37 vasprintf(char **buf, struct malloc_type *mtp, const char *format, va_list va)
   38 {
   39         int len, ret;
   40         va_list tmp_va;
   41         char dummy;
   42 
   43         va_copy(tmp_va, va);
   44         len = vsnprintf(&dummy, 0, format, tmp_va);
   45         va_end(tmp_va);
   46         if (len < 0) {
   47                 *buf = NULL;
   48                 return (len);
   49         }
   50 
   51         /* Account for null terminator. */
   52         len += 1;
   53         *buf = malloc(len, mtp, M_NOWAIT);
   54         if (*buf == NULL)
   55                 return (-1);
   56 
   57         ret = vsnprintf(*buf, len, format, va);
   58         if (ret < 0) {
   59                 free(*buf, mtp);
   60                 *buf = NULL;
   61         }
   62 
   63         return (ret);
   64 }
   65 
   66 int
   67 asprintf(char **buf, struct malloc_type *mtp, const char *format, ...)
   68 {
   69         int ret;
   70         va_list va;
   71 
   72         va_start(va, format);
   73         ret = vasprintf(buf, mtp, format, va);
   74         va_end(va);
   75 
   76         return (ret);
   77 }

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