mirror of
https://github.com/troglobit/finit.git
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139 lines
3.1 KiB
C
139 lines
3.1 KiB
C
/* Misc. shared utility functions for initctl, reboot and finit
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*
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* Copyright (c) 2016 Joachim Nilsson <troglobit@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "config.h"
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#include <ctype.h> /* isprint() */
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#include <string.h>
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#include <unistd.h>
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#ifdef HAVE_TERMIOS_H /* for screen_width() */
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#include <poll.h>
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#include <stdio.h>
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#include <termios.h>
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#endif
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int screen_rows = 24;
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int screen_cols = 80;
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char *prognm = NULL;
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char *progname(char *arg0)
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{
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prognm = strrchr(arg0, '/');
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if (prognm)
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prognm++;
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else
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prognm = arg0;
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return prognm;
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}
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void do_sleep(unsigned int sec)
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{
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while ((sec = sleep(sec)))
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;
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}
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/* Allowed characters in job/id/name */
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static int isallowed(int ch)
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{
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return isprint(ch);
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}
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/* Sanitize user input, make sure to NUL terminate. */
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char *sanitize(char *arg, size_t len)
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{
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size_t i = 0;
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while (isallowed(arg[i]) && i < len)
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i++;
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if (i + 1 < len) {
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arg[i + 1] = 0;
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return arg;
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}
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if (i > 1 && arg[i] == 0)
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return arg;
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return NULL;
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}
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static void initscr(int *row, int *col)
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{
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if (!row || !col)
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return;
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#if defined(TCSANOW) && defined(POLLIN)
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struct termios tc, saved;
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struct pollfd fd = { STDIN_FILENO, POLLIN, 0 };
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/* Disable echo to terminal while probing */
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tcgetattr(STDERR_FILENO, &tc);
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saved = tc;
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tc.c_cflag |= (CLOCAL | CREAD);
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tc.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
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tcsetattr(STDERR_FILENO, TCSANOW, &tc);
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/*
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* Save cursor pos+attr
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* Diable top+bottom margins
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* Set cursor at the far bottom,right pos
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* Query term for resulting pos
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*/
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fprintf(stderr, "\e7" "\e[r" "\e[999;999H" "\e[6n");
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/*
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* Wait here for terminal to echo back \e[row,lineR ...
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*/
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if (poll(&fd, 1, 300) <= 0 || scanf("\e[%d;%dR", row, col) != 2) {
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*row = 24;
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*col = 80;
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}
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/*
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* Restore above saved cursor pos+attr
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*/
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fprintf(stderr, "\e8");
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/* Restore terminal */
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tcsetattr(STDERR_FILENO, TCSANOW, &saved);
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return;
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#else
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*row = 24;
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*col = 80;
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#endif
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}
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void screen_init(void)
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{
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initscr(&screen_rows, &screen_cols);
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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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