string/strerror-fbsd.c

   1 /*-
   2  * Copyright (c) 1988, 1993
   3  *      The Regents of the University of California.  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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #if defined(LIBC_SCCS) && !defined(lint)
  31 static char sccsid[] = "@(#)strerror.c  8.1 (Berkeley) 6/4/93";
  32 #endif /* LIBC_SCCS and not lint */
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD: src/lib/libc/string/strerror.c,v 1.16 2007/01/09 00:28:12 imp Exp $");
  35
  36 #if defined(NLS)
  37 #include <nl_types.h>
  38 #endif
  39
  40 #include <limits.h>
  41 #include <errno.h>
  42 #include <string.h>
  43 #include <stdio.h>
  44
  45 #define UPREFIX         "Unknown error"
  46
  47 /*
  48  * Define a buffer size big enough to describe a 64-bit signed integer
  49  * converted to ASCII decimal (19 bytes), with an optional leading sign
  50  * (1 byte); finally, we get the prefix, delimiter (": ") and a trailing
  51  * NUL from UPREFIX.
  52  */
  53 #define EBUFSIZE        (20 + 2 + sizeof(UPREFIX))
  54
  55 #ifndef BUILDING_VARIANT
  56 /*
  57  * Doing this by hand instead of linking with stdio(3) avoids bloat for
  58  * statically linked binaries.
  59  */
  60 __private_extern__ void
  61 __errstr(int num, char *uprefix, char *buf, size_t len)
  62 {
  63         char *t;
  64         unsigned int uerr;
  65         char tmp[EBUFSIZE];
  66
  67         t = tmp + sizeof(tmp);
  68         *--t = '\0';
  69         uerr = (num >= 0) ? num : -num;
  70         do {
  71                 *--t = "0123456789"[uerr % 10];
  72         } while (uerr /= 10);
  73         if (num < 0)
  74                 *--t = '-';
  75         *--t = ' ';
  76         *--t = ':';
  77         strlcpy(buf, uprefix, len);
  78         strlcat(buf, t, len);
  79 }
  80
  81 int
  82 strerror_r(int errnum, char *strerrbuf, size_t buflen)
  83 {
  84         int retval = 0;
  85 #if defined(NLS)
  86         int saved_errno = errno;
  87         nl_catd catd;
  88         catd = catopen("libc", NL_CAT_LOCALE);
  89 #endif
  90
  91         if (errnum < 0 || errnum >= sys_nerr) {
  92                 __errstr(errnum,
  93 #if defined(NLS)
  94                         catgets(catd, 1, 0xffff, UPREFIX),
  95 #else
  96                         UPREFIX,
  97 #endif
  98                         strerrbuf, buflen);
  99                 retval = EINVAL;
 100         } else {
 101                 if (strlcpy(strerrbuf,
 102 #if defined(NLS)
 103                         catgets(catd, 1, errnum, sys_errlist[errnum]),
 104 #else
 105                         sys_errlist[errnum],
 106 #endif
 107                         buflen) >= buflen)
 108                 retval = ERANGE;
 109         }
 110
 111 #if defined(NLS)
 112         catclose(catd);
 113         errno = saved_errno;
 114 #endif
 115
 116         return (retval);
 117 }
 118 #else /* BUILDING_VARIANT */
 119 __private_extern__ void __errstr(int, char *, size_t);
 120 #endif /* !BUILDING_VARIANT */
 121
 122 char *
 123 strerror(int num)
 124 {
 125         static char ebuf[NL_TEXTMAX];
 126
 127 #if !__DARWIN_UNIX03
 128         if (strerror_r(num, ebuf, sizeof(ebuf)) != 0)
 129         errno = EINVAL;
 130 #else
 131         (void)strerror_r(num, ebuf, sizeof(ebuf));
 132 #endif
 133         return (ebuf);
 134 }