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