dde222577d
creation. * Tag the internal err() function with __printflike to allow checking for non-constant format string arguments (none exist) * Use fmtcheck() to sanitize the tar command obtained via -t to make sure it doesn't contain extraneous format operators. Reviewed by: mikeh MFC after: 1 week
103 lines
1.9 KiB
C
103 lines
1.9 KiB
C
/*
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* Routines for logging error messages or other informative messages.
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*
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* Log messages can easily contain the program name, a time stamp, system
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* error messages, and arbitrary printf-style strings, and can be directed
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* to stderr or a log file.
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*
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* Author: Stephen McKay
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*
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* NOTICE: This is free software. I hope you get some use from this program.
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* In return you should think about all the nice people who give away software.
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* Maybe you should write some free software too.
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*/
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#ifndef lint
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <stdio.h>
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#include <string.h>
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#include <stdarg.h>
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#include <time.h>
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#include <errno.h>
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#include "error.h"
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static FILE *error_fp = NULL;
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static char *prog = NULL;
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/*
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* Log errors to the given file.
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*/
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void
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err_set_log(char *log_file)
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{
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FILE *fp;
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if ((fp = fopen(log_file, "a")) == NULL)
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err("cannot log to '%s'", log_file);
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else
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error_fp = fp;
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}
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/*
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* Set the error prefix if not logging to a file.
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*/
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void
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err_prog_name(char *name)
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{
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if ((prog = strrchr(name, '/')) == NULL)
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prog = name;
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else
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prog++;
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}
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/*
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* Log an error.
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*
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* A leading '*' in the message format means we want the system errno
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* decoded and appended.
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*/
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void
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err(const char *fmt, ...)
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{
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va_list ap;
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time_t now;
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struct tm *tm;
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FILE *fp;
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int x = errno;
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int want_errno;
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if ((fp = error_fp) == NULL)
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{
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fp = stderr;
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if (prog != NULL)
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fprintf(fp, "%s: ", prog);
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}
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else
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{
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time(&now);
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tm = localtime(&now);
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fprintf(fp, "%04d-%02d-%02d %02d:%02d ", tm->tm_year+1900,
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tm->tm_mon+1, tm->tm_mday, tm->tm_hour, tm->tm_min);
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}
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want_errno = 0;
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if (*fmt == '*')
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want_errno++, fmt++;
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va_start(ap, fmt);
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vfprintf(fp, fmt, ap);
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va_end(ap);
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if (want_errno)
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fprintf(fp, ": %s", strerror(x));
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fprintf(fp, "\n");
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fflush(fp);
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}
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