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 * 3. 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("$FreeBSD$"); 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 /* 56 * Doing this by hand instead of linking with stdio(3) avoids bloat for 57 * statically linked binaries. 58 */ 59 static void 60 errstr(int num, char *uprefix, char *buf, size_t len) 61 { 62 char *t; 63 unsigned int uerr; 64 char tmp[EBUFSIZE]; 65 66 t = tmp + sizeof(tmp); 67 *--t = '\0'; 68 uerr = (num >= 0) ? num : -num; 69 do { 70 *--t = "0123456789"[uerr % 10]; 71 } while (uerr /= 10); 72 if (num < 0) 73 *--t = '-'; 74 *--t = ' '; 75 *--t = ':'; 76 strlcpy(buf, uprefix, len); 77 strlcat(buf, t, len); 78 } 79 80 int 81 strerror_r(int errnum, char *strerrbuf, size_t buflen) 82 { 83 int retval = 0; 84 #if defined(NLS) 85 int saved_errno = errno; 86 nl_catd catd; 87 catd = catopen("libc", NL_CAT_LOCALE); 88 #endif 89 90 if (errnum < 0 || errnum >= sys_nerr) { 91 errstr(errnum, 92 #if defined(NLS) 93 catgets(catd, 1, 0xffff, UPREFIX), 94 #else 95 UPREFIX, 96 #endif 97 strerrbuf, buflen); 98 retval = EINVAL; 99 } else { 100 if (strlcpy(strerrbuf, 101 #if defined(NLS) 102 catgets(catd, 1, errnum, sys_errlist[errnum]), 103 #else 104 sys_errlist[errnum], 105 #endif 106 buflen) >= buflen) 107 retval = ERANGE; 108 } 109 110 #if defined(NLS) 111 catclose(catd); 112 errno = saved_errno; 113 #endif 114 115 return (retval); 116 } 117 118 char * 119 strerror(int num) 120 { 121 static char ebuf[NL_TEXTMAX]; 122 123 if (strerror_r(num, ebuf, sizeof(ebuf)) != 0) 124 errno = EINVAL; 125 return (ebuf); 126 } 127