1/*
2 * Copyright (c) 1997 - 2000 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "login_locl.h"
35
36RCSID("$Id$");
37
38static sig_atomic_t intr_flag;
39
40static void
41intr(int sig)
42{
43    intr_flag++;
44}
45
46#ifndef NSIG
47#define NSIG 47
48#endif
49
50int
51read_string(const char *prompt, char *buf, size_t len, int echo)
52{
53    struct sigaction sigs[NSIG];
54    int oksigs[NSIG];
55    struct sigaction sa;
56    FILE *tty;
57    int ret = 0;
58    int of = 0;
59    int i;
60    int c;
61    char *p;
62
63    struct termios t_new, t_old;
64
65    memset(&oksigs, 0, sizeof(oksigs));
66
67    memset(&sa, 0, sizeof(sa));
68    sa.sa_handler = intr;
69    sigemptyset(&sa.sa_mask);
70    sa.sa_flags = 0;
71    for(i = 1; i < sizeof(sigs) / sizeof(sigs[0]); i++)
72	if (i != SIGALRM)
73	    if (sigaction(i, &sa, &sigs[i]) == 0)
74		oksigs[i] = 1;
75
76    if((tty = fopen("/dev/tty", "r")) == NULL)
77	tty = stdin;
78
79    fprintf(stderr, "%s", prompt);
80    fflush(stderr);
81
82    if(echo == 0){
83	tcgetattr(fileno(tty), &t_old);
84	memcpy(&t_new, &t_old, sizeof(t_new));
85	t_new.c_lflag &= ~ECHO;
86	tcsetattr(fileno(tty), TCSANOW, &t_new);
87    }
88    intr_flag = 0;
89    p = buf;
90    while(intr_flag == 0){
91	c = getc(tty);
92	if(c == EOF){
93	    if(!ferror(tty))
94		ret = 1;
95	    break;
96	}
97	if(c == '\n')
98	    break;
99	if(of == 0)
100	    *p++ = c;
101	of = (p == buf + len);
102    }
103    if(of)
104	p--;
105    *p = 0;
106
107    if(echo == 0){
108	printf("\n");
109	tcsetattr(fileno(tty), TCSANOW, &t_old);
110    }
111
112    if(tty != stdin)
113	fclose(tty);
114
115    for(i = 1; i < sizeof(sigs) / sizeof(sigs[0]); i++)
116	if (oksigs[i])
117	    sigaction(i, &sigs[i], NULL);
118
119    if(ret)
120	return -3;
121    if(intr_flag)
122	return -2;
123    if(of)
124	return -1;
125    return 0;
126}
127
128
129#if 0
130int main()
131{
132    char s[128];
133    int ret;
134    ret = read_string("foo: ", s, sizeof(s), 0);
135    printf("%d ->%s<-\n", ret, s);
136}
137#endif
138