com_err.c revision 822c10e84e5f57394bcad921adc560f5b032c03e 
1/*
2 * Copyright 1987, 1988 by MIT Student Information Processing Board.
3 *
4 * Permission to use, copy, modify, and distribute this software and
5 * its documentation for any purpose is hereby granted, provided that
6 * the names of M.I.T. and the M.I.T. S.I.P.B. not be used in
7 * advertising or publicity pertaining to distribution of the software
8 * without specific, written prior permission.  M.I.T. and the
9 * M.I.T. S.I.P.B. make no representations about the suitability of
10 * this software for any purpose.  It is provided "as is" without
11 * express or implied warranty.
12 */
13
14#include <stdio.h>
15#ifdef HAVE_TERMIOS_H
16#include <termios.h>
17#endif
18#ifdef HAVE_UNISTD_H
19#include <unistd.h>
20#endif
21#include "com_err.h"
22#include "error_table.h"
23#include "internal.h"
24
25static void
26default_com_err_proc (const char *whoami, errcode_t code, const
27		      char *fmt, va_list args)
28	COM_ERR_ATTR((format(printf, 3, 0)));
29
30static void
31default_com_err_proc (const char *whoami, errcode_t code, const
32		      char *fmt, va_list args)
33{
34    int do_cr = 1, fd = fileno(stderr);
35
36    if (whoami) {
37	fputs(whoami, stderr);
38	fputs(": ", stderr);
39    }
40    if (code) {
41	fputs(error_message(code), stderr);
42	fputs(" ", stderr);
43    }
44    if (fmt) {
45        vfprintf (stderr, fmt, args);
46    }
47    if (!isatty(fd))
48	do_cr = 0;
49#ifdef HAVE_TERMIOS_H
50    else {
51	struct termios t;
52
53	if ((tcgetattr(fd, &t)) == 0 &&
54	    (t.c_oflag & OPOST) && (t.c_oflag & ONLCR))
55	do_cr = 0;
56    }
57#endif
58    if (do_cr)
59	fputc('\r', stderr);
60    fputc('\n', stderr);
61    fflush(stderr);
62}
63
64typedef void (*errf) (const char *, errcode_t, const char *, va_list);
65
66errf com_err_hook = default_com_err_proc;
67
68void com_err_va (const char *whoami, errcode_t code, const char *fmt,
69		 va_list args)
70{
71    (*com_err_hook) (whoami, code, fmt, args);
72}
73
74void com_err (const char *whoami,
75	      errcode_t code,
76	      const char *fmt, ...)
77{
78    va_list pvar;
79
80    if (!com_err_hook)
81	com_err_hook = default_com_err_proc;
82    va_start(pvar, fmt);
83    com_err_va (whoami, code, fmt, pvar);
84    va_end(pvar);
85}
86
87errf set_com_err_hook (new_proc)
88    errf new_proc;
89{
90    errf x = com_err_hook;
91
92    if (new_proc)
93	com_err_hook = new_proc;
94    else
95	com_err_hook = default_com_err_proc;
96
97    return x;
98}
99
100errf reset_com_err_hook () {
101    errf x = com_err_hook;
102    com_err_hook = default_com_err_proc;
103    return x;
104}
105