diff options
Diffstat (limited to 'usr.sbin/ctm/ctm_rmail/error.c')
| -rw-r--r-- | usr.sbin/ctm/ctm_rmail/error.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/usr.sbin/ctm/ctm_rmail/error.c b/usr.sbin/ctm/ctm_rmail/error.c index be3581d..724b117 100644 --- a/usr.sbin/ctm/ctm_rmail/error.c +++ b/usr.sbin/ctm/ctm_rmail/error.c @@ -1,7 +1,22 @@ +/* + * Routines for logging error messages or other informative messages. + * + * Log messages can easily contain the program name, a time stamp, system + * error messages, and arbitrary printf-style strings, and can be directed + * to stderr or a log file. + * + * Author: Stephen McKay + * + * NOTICE: This is free software. I hope you get some use from this program. + * In return you should think about all the nice people who give away software. + * Maybe you should write some free software too. + */ + #include <stdio.h> #include <string.h> #include <stdarg.h> #include <time.h> +#include <errno.h> #include "error.h" static FILE *error_fp = NULL; @@ -38,6 +53,9 @@ err_prog_name(char *name) /* * Log an error. + * + * A leading '*' in the message format means we want the system errno + * decoded and appended. */ void err(char *fmt, ...) @@ -46,6 +64,8 @@ err(char *fmt, ...) time_t now; struct tm *tm; FILE *fp; + int x = errno; + int want_errno; if ((fp = error_fp) == NULL) { @@ -61,10 +81,17 @@ err(char *fmt, ...) tm->tm_mon+1, tm->tm_mday, tm->tm_hour, tm->tm_min); } + want_errno = 0; + if (*fmt == '*') + want_errno++, fmt++; + va_start(ap, fmt); vfprintf(fp, fmt, ap); va_end(ap); + if (want_errno) + fprintf(fp, ": %s", strerror(x)); + fprintf(fp, "\n"); fflush(fp); } |
