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Annotation of src/usr.bin/cu/input.c, Revision 1.2

1.2     ! nicm        1: /* $OpenBSD: input.c,v 1.1 2012/07/10 08:02:27 nicm Exp $ */
1.1       nicm        2:
                      3: /*
                      4:  * Copyright (c) 2012 Nicholas Marriott <nicm@openbsd.org>
                      5:  *
                      6:  * Permission to use, copy, modify, and distribute this software for any
                      7:  * purpose with or without fee is hereby granted, provided that the above
                      8:  * copyright notice and this permission notice appear in all copies.
                      9:  *
                     10:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     11:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     12:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     13:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     14:  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
                     15:  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
                     16:  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     17:  */
                     18:
                     19: #include <sys/types.h>
                     20:
                     21: #include <ctype.h>
                     22: #include <errno.h>
                     23: #include <signal.h>
                     24: #include <stdio.h>
                     25: #include <string.h>
                     26: #include <termios.h>
                     27: #include <unistd.h>
                     28:
                     29: #include "cu.h"
                     30:
                     31: /*
                     32:  * Prompt and read a line of user input from stdin. We want to use the termios
                     33:  * we were started with so restore and stick in a signal handler for ^C.
                     34:  */
                     35:
                     36: volatile sig_atomic_t input_stop;
                     37:
                     38: void   input_signal(int);
                     39:
                     40: void
                     41: input_signal(int sig)
                     42: {
                     43:        input_stop = 1;
                     44: }
                     45:
                     46: const char *
                     47: get_input(const char *prompt)
                     48: {
                     49:        static char             s[BUFSIZ];
                     50:        struct sigaction        act, oact;
                     51:        char                    c, *cp, *out = NULL;
                     52:        ssize_t                 n;
                     53:
                     54:        memset(&act, 0, sizeof(act));
                     55:        sigemptyset(&act.sa_mask);
                     56:        act.sa_flags = 0;
                     57:        act.sa_handler = input_signal;
                     58:        if (sigaction(SIGINT, &act, &oact) != 0)
1.2     ! nicm       59:                cu_err(1, "sigaction");
1.1       nicm       60:        input_stop = 0;
                     61:
                     62:        restore_termios();
                     63:
                     64:        printf("%s ", prompt);
                     65:        fflush(stdout);
                     66:
                     67:        cp = s;
                     68:        while (cp != s + sizeof(s) - 1) {
                     69:                n = read(STDIN_FILENO, &c, 1);
                     70:                if (n == -1 && errno != EINTR)
1.2     ! nicm       71:                        cu_err(1, "read");
1.1       nicm       72:                if (n != 1 || input_stop)
                     73:                        break;
                     74:                if (c == '\n') {
                     75:                        out = s;
                     76:                        break;
                     77:                }
                     78:                if (!iscntrl((u_char)c))
                     79:                        *cp++ = c;
                     80:        }
                     81:        *cp = '\0';
                     82:
                     83:        set_termios();
                     84:
                     85:        sigaction(SIGINT, &oact, NULL);
                     86:
                     87:        return (out);
                     88: }