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Diffstat (limited to 'fmtutils.c')
| -rw-r--r-- | fmtutils.c | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/fmtutils.c b/fmtutils.c new file mode 100644 index 00000000..9f1acab6 --- /dev/null +++ b/fmtutils.c @@ -0,0 +1,129 @@ +/* + * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998 + * 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. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the Computer Systems + * Engineering Group at Lawrence Berkeley Laboratory. + * 4. Neither the name of the University nor of the Laboratory 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. + */ + +/* + * Utilities for message formatting used both by libpcap and rpcapd. + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <stddef.h> +#include <stdarg.h> +#include <stdio.h> +#include <string.h> +#include <errno.h> + +#include <pcap/pcap.h> + +#include "portability.h" + +#include "fmtutils.h" + +/* + * Generate an error message based on a format, arguments, and an + * errno, with a message for the errno after the formatted output. + */ +void +pcap_fmt_errmsg_for_errno(char *errbuf, size_t errbuflen, int errnum, + const char *fmt, ...) +{ + va_list ap; + size_t msglen; + char *p; + size_t errbuflen_remaining; +#if defined(HAVE_STRERROR_S) + errno_t err; +#elif defined(HAVE_STRERROR_R) + int err; +#endif + + va_start(ap, fmt); + pcap_vsnprintf(errbuf, errbuflen, fmt, ap); + va_end(ap); + msglen = strlen(errbuf); + + /* + * Do we have enough space to append ": "? + * Including the terminating '\0', that's 3 bytes. + */ + if (msglen + 3 > errbuflen) { + /* No - just give them what we've produced. */ + return; + } + p = errbuf + msglen; + errbuflen_remaining = errbuflen - msglen; + *p++ = ':'; + *p++ = ' '; + *p = '\0'; + msglen += 2; + errbuflen_remaining -= 2; + + /* + * Now append the string for the error code. + */ +#if defined(HAVE_STRERROR_S) + err = strerror_s(p, errbuflen_remaining, errnum); + if (err != 0) { + /* + * It doesn't appear to be documented anywhere obvious + * what the error returns from strerror_s(). + */ + pcap_snprintf(p, errbuflen_remaining, "Error %d", errnum); + } +#elif defined(HAVE_STRERROR_R) + err = strerror_r(errnum, p, errbuflen_remaining); + if (err == EINVAL) { + /* + * UNIX 03 says this isn't guaranteed to produce a + * fallback error message. + */ + pcap_snprintf(p, errbuflen_remaining, "Unknown error: %d", + errnum); + } else if (err == ERANGE) { + /* + * UNIX 03 says this isn't guaranteed to produce a + * fallback error message. + */ + pcap_snprintf(p, errbuflen_remaining, + "Message for error %d is too long", errnum); + } +#else + /* + * We have neither strerror_s() nor strerror_r(), so we're + * stuck with using pcap_strerror(). + */ + pcap_snprintf(p, errbuflen_remaining, "%s", pcap_strerror(errnum)); +#endif +} |