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Member "file-5.35/src/dprintf.c" (11 Sep 2018, 2069 Bytes) of package /linux/misc/file-5.35.tar.gz:


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    1 /*
    2  * Copyright (c) Ian F. Darwin 1986-1995.
    3  * Software written by Ian F. Darwin and others;
    4  * maintained 1995-present by Christos Zoulas and others.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice immediately at the beginning of the file, without modification,
   11  *    this list of conditions, and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
   20  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 #include "file.h"
   29 
   30 #ifndef lint
   31 FILE_RCSID("@(#)$File: dprintf.c,v 1.2 2018/09/09 20:33:28 christos Exp $")
   32 #endif  /* lint */
   33 
   34 #include <assert.h>
   35 #include <unistd.h>
   36 #include <stdio.h>
   37 #include <stdarg.h>
   38 
   39 int
   40 dprintf(int fd, const char *fmt, ...)
   41 {
   42     va_list ap;
   43     /* Simpler than using vasprintf() here, since we never need more */
   44     char buf[1024];
   45     int len;
   46 
   47     va_start(ap, fmt);
   48     len = vsnprintf(buf, sizeof(buf), fmt, ap);
   49     va_end(ap);
   50 
   51     if ((size_t)len >= sizeof(buf))
   52         return -1;
   53 
   54     if (write(fd, buf, (size_t)len) != len)
   55         return -1;
   56 
   57     return len;
   58 }