diff options
Diffstat (limited to 'lib/libc/string/strerror.c')
| -rw-r--r-- | lib/libc/string/strerror.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/lib/libc/string/strerror.c b/lib/libc/string/strerror.c new file mode 100644 index 0000000..890ed21 --- /dev/null +++ b/lib/libc/string/strerror.c @@ -0,0 +1,126 @@ +/*- + * Copyright (c) 1988, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)strerror.c 8.1 (Berkeley) 6/4/93"; +#endif /* LIBC_SCCS and not lint */ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#if defined(NLS) +#include <nl_types.h> +#endif + +#include <limits.h> +#include <errno.h> +#include <string.h> +#include <stdio.h> + +#define UPREFIX "Unknown error" + +/* + * Define a buffer size big enough to describe a 64-bit signed integer + * converted to ASCII decimal (19 bytes), with an optional leading sign + * (1 byte); finally, we get the prefix, delimiter (": ") and a trailing + * NUL from UPREFIX. + */ +#define EBUFSIZE (20 + 2 + sizeof(UPREFIX)) + +/* + * Doing this by hand instead of linking with stdio(3) avoids bloat for + * statically linked binaries. + */ +static void +errstr(int num, char *uprefix, char *buf, size_t len) +{ + char *t; + unsigned int uerr; + char tmp[EBUFSIZE]; + + t = tmp + sizeof(tmp); + *--t = '\0'; + uerr = (num >= 0) ? num : -num; + do { + *--t = "0123456789"[uerr % 10]; + } while (uerr /= 10); + if (num < 0) + *--t = '-'; + *--t = ' '; + *--t = ':'; + strlcpy(buf, uprefix, len); + strlcat(buf, t, len); +} + +int +strerror_r(int errnum, char *strerrbuf, size_t buflen) +{ + int retval = 0; +#if defined(NLS) + int saved_errno = errno; + nl_catd catd; + catd = catopen("libc", NL_CAT_LOCALE); +#endif + + if (errnum < 1 || errnum >= sys_nerr) { + errstr(errnum, +#if defined(NLS) + catgets(catd, 1, 0xffff, UPREFIX), +#else + UPREFIX, +#endif + strerrbuf, buflen); + retval = EINVAL; + } else { + if (strlcpy(strerrbuf, +#if defined(NLS) + catgets(catd, 1, errnum, sys_errlist[errnum]), +#else + sys_errlist[errnum], +#endif + buflen) >= buflen) + retval = ERANGE; + } + +#if defined(NLS) + catclose(catd); + errno = saved_errno; +#endif + + return (retval); +} + +char * +strerror(int num) +{ + static char ebuf[NL_TEXTMAX]; + + if (strerror_r(num, ebuf, sizeof(ebuf)) != 0) + errno = EINVAL; + return (ebuf); +} |
