128 lines
3.2 KiB
C
128 lines
3.2 KiB
C
/*
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* Copyright (c) 1997 - 2000 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "login_locl.h"
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RCSID("$Id: read_string.c,v 1.4 2000/06/21 02:09:36 assar Exp $");
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static sig_atomic_t intr_flag;
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static void
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intr(int sig)
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{
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intr_flag++;
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}
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int
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read_string(const char *prompt, char *buf, size_t len, int echo)
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{
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struct sigaction sigs[47];
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struct sigaction sa;
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FILE *tty;
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int ret = 0;
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int of = 0;
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int i;
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int c;
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char *p;
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struct termios t_new, t_old;
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memset(&sa, 0, sizeof(sa));
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sa.sa_handler = intr;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0;
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for(i = 0; i < sizeof(sigs) / sizeof(sigs[0]); i++)
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if (i != SIGALRM) sigaction(i, &sa, &sigs[i]);
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if((tty = fopen("/dev/tty", "r")) == NULL)
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tty = stdin;
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fprintf(stderr, "%s", prompt);
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fflush(stderr);
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if(echo == 0){
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tcgetattr(fileno(tty), &t_old);
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memcpy(&t_new, &t_old, sizeof(t_new));
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t_new.c_lflag &= ~ECHO;
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tcsetattr(fileno(tty), TCSANOW, &t_new);
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}
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intr_flag = 0;
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p = buf;
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while(intr_flag == 0){
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c = getc(tty);
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if(c == EOF){
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if(!ferror(tty))
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ret = 1;
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break;
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}
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if(c == '\n')
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break;
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if(of == 0)
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*p++ = c;
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of = (p == buf + len);
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}
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if(of)
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p--;
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*p = 0;
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if(echo == 0){
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printf("\n");
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tcsetattr(fileno(tty), TCSANOW, &t_old);
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}
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if(tty != stdin)
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fclose(tty);
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for(i = 0; i < sizeof(sigs) / sizeof(sigs[0]); i++)
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if (i != SIGALRM) sigaction(i, &sigs[i], NULL);
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if(ret)
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return -3;
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if(intr_flag)
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return -2;
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if(of)
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return -1;
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return 0;
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}
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#if 0
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int main()
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{
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char s[128];
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int ret;
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ret = read_string("foo: ", s, sizeof(s), 0);
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printf("%d ->%s<-\n", ret, s);
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}
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#endif
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