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/* $OpenBSD: input.c,v 1.2 2012/07/10 10:28:05 nicm Exp $ */ |
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/* |
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* Copyright (c) 2012 Nicholas Marriott <nicm@openbsd.org> |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER |
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING |
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#include <sys/types.h> |
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#include <ctype.h> |
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#include <errno.h> |
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#include <signal.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <termios.h> |
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#include <unistd.h> |
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#include "cu.h" |
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/* |
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* Prompt and read a line of user input from stdin. We want to use the termios |
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* we were started with so restore and stick in a signal handler for ^C. |
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*/ |
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volatile sig_atomic_t input_stop; |
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void input_signal(int); |
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void |
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input_signal(int sig) |
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{ |
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input_stop = 1; |
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} |
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const char * |
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get_input(const char *prompt) |
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{ |
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static char s[BUFSIZ]; |
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struct sigaction act, oact; |
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char c, *cp, *out = NULL; |
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ssize_t n; |
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memset(&act, 0, sizeof(act)); |
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sigemptyset(&act.sa_mask); |
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act.sa_flags = 0; |
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act.sa_handler = input_signal; |
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if (sigaction(SIGINT, &act, &oact) != 0) |
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cu_err(1, "sigaction"); |
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input_stop = 0; |
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restore_termios(); |
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printf("%s ", prompt); |
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fflush(stdout); |
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cp = s; |
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while (cp != s + sizeof(s) - 1) { |
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n = read(STDIN_FILENO, &c, 1); |
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if (n == -1 && errno != EINTR) |
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cu_err(1, "read"); |
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if (n != 1 || input_stop) |
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break; |
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if (c == '\n') { |
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out = s; |
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break; |
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} |
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if (!iscntrl((u_char)c)) |
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*cp++ = c; |
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} |
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*cp = '\0'; |
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set_termios(); |
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sigaction(SIGINT, &oact, NULL); |
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return (out); |
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} |