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/* error.c error handling routines from Richard Stevens
*/
#include "ipband.h"
static void err_doit(int, const char *, va_list);
/* Nonfatal error related to a system call.
* Print a message and return. */
void err_ret(const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
err_doit(1, fmt, ap);
va_end(ap);
return;
}
/* Fatal error related to a system call.
* Print a message and terminate. */
void err_sys(const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
err_doit(1, fmt, ap);
va_end(ap);
exit(1);
}
/* Nonfatal error unrelated to a system call.
* Print a message and return. */
void err_msg(const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
err_doit(0, fmt, ap);
va_end(ap);
return;
}
/* Fatal error unrelated to a system call.
* Print a message and terminate. */
void err_quit(const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
err_doit(0, fmt, ap);
va_end(ap);
exit(1);
}
/* Print a message and return to caller.
* Caller specifies "errnoflag". */
static void err_doit(int errnoflag, const char *fmt, va_list ap) {
int errno_save;
char buf[MAXLINE];
errno_save = errno; /* value caller might want printed */
vsprintf(buf, fmt, ap);
if (errnoflag)
sprintf(buf+strlen(buf), ": %s", strerror(errno_save));
strcat(buf, "\n");
fflush(stdout); /* in case stdout and stderr are the same */
fputs(buf, stderr);
fflush(NULL); /* flushes all stdio output streams */
return;
}
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