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93 lines
2.2 KiB
C
93 lines
2.2 KiB
C
/* Safe yes-or-no with prompt
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*
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* Copyright (c) 2009 Joachim Nilsson <troglobit@gmail.com>
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*
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* Permission to use, copy, modify, and/or 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 USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdio_ext.h> /* __fpurge() */
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#include <stdarg.h>
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#include <termios.h>
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#include <unistd.h>
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static char rawgetch(void)
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{
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struct termios savemodes, modmodes;
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char val;
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if (!isatty(STDIN_FILENO))
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return getchar();
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/* Backup terminal settings. */
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if (tcgetattr(STDIN_FILENO, &savemodes) < 0) {
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return -1;
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}
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/* "stty cbreak -echo" */
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modmodes = savemodes;
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modmodes.c_lflag &= ~ICANON;
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modmodes.c_lflag &= ~ECHO;
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modmodes.c_cc[VMIN] = 1;
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modmodes.c_cc[VTIME] = 0;
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/* Set terminal in raw mode. */
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if (tcsetattr(STDIN_FILENO, TCSANOW, &modmodes) < 0) {
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tcsetattr(STDIN_FILENO, TCSANOW, &savemodes);
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return -1;
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}
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val = getchar();
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/* Restore terminal to previous state. */
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tcsetattr(STDIN_FILENO, TCSANOW, &savemodes);
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return val;
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}
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/**
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* yorn - Pose a a Yes or No question and return answer
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* @fmt: Standard printf() style argument(s).
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*
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* This function prints the given question on screen, waits for user
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* input in the form of yes or no.
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*
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* Returns:
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* True(1) or False(0). True if the answer is yes.
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*/
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int yorn(const char *fmt, ...)
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{
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va_list ap;
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char yorn;
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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__fpurge(stdin);
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yorn = rawgetch();
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printf("%c\n", yorn);
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fflush(stdout);
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if (yorn != 'y' && yorn != 'Y')
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return 0;
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return 1;
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}
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/**
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* Local Variables:
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* indent-tabs-mode: t
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* c-file-style: "linux"
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* End:
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*/
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