From 33cc3b9dd7bf3dae1c6cf86e46bb4923f96e7fff Mon Sep 17 00:00:00 2001 From: トトも <85485984+ElectronicsArchiver@users.noreply.github.com> Date: Sat, 16 Apr 2022 20:18:56 +0200 Subject: Source / Include Folder (#88) Moved Source Files Into `src` Folder --- bar.c | 248 ------------------------------------------------------------------ 1 file changed, 248 deletions(-) delete mode 100644 bar.c (limited to 'bar.c') diff --git a/bar.c b/bar.c deleted file mode 100644 index b0e595e..0000000 --- a/bar.c +++ /dev/null @@ -1,248 +0,0 @@ -/**************************************************************************** - * bfs * - * Copyright (C) 2020-2022 Tavian Barnes * - * * - * Permission to use, copy, modify, and/or distribute this software for any * - * purpose with or without fee is hereby granted. * - * * - * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * - * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * - * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * - * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * - * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * - * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * - * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * - ****************************************************************************/ - -#include "bar.h" -#include "dstring.h" -#include "util.h" -#include -#include -#include -#include -#include -#include -#include -#include -#include - -struct bfs_bar { - int fd; - volatile sig_atomic_t width; - volatile sig_atomic_t height; -}; - -/** The global status bar instance. */ -static struct bfs_bar the_bar = { - .fd = -1, -}; - -/** Get the terminal size, if possible. */ -static int bfs_bar_getsize(struct bfs_bar *bar) { -#ifdef TIOCGWINSZ - struct winsize ws; - if (ioctl(bar->fd, TIOCGWINSZ, &ws) != 0) { - return -1; - } - - bar->width = ws.ws_col; - bar->height = ws.ws_row; - return 0; -#else - errno = ENOTSUP; - return -1; -#endif -} - -/** Async Signal Safe puts(). */ -static int ass_puts(int fd, const char *str) { - size_t len = strlen(str); - return xwrite(fd, str, len) == len ? 0 : -1; -} - -/** Number of decimal digits needed for terminal sizes. */ -#define ITOA_DIGITS ((sizeof(unsigned short) * CHAR_BIT + 2) / 3) - -/** Async Signal Safe itoa(). */ -static char *ass_itoa(char *str, unsigned int n) { - char *end = str + ITOA_DIGITS; - *end = '\0'; - - char *c = end; - do { - *--c = '0' + (n % 10); - n /= 10; - } while (n); - - size_t len = end - c; - memmove(str, c, len + 1); - return str + len; -} - -/** Update the size of the scrollable region. */ -static int bfs_bar_resize(struct bfs_bar *bar) { - char esc_seq[12 + ITOA_DIGITS] = - "\0337" // DECSC: Save cursor - "\033[;"; // DECSTBM: Set scrollable region - - // DECSTBM takes the height as the second argument - char *ptr = esc_seq + strlen(esc_seq); - ptr = ass_itoa(ptr, bar->height - 1); - - strcpy(ptr, - "r" // DECSTBM - "\0338" // DECRC: Restore the cursor - "\033[J" // ED: Erase display from cursor to end - ); - - return ass_puts(bar->fd, esc_seq); -} - -#ifdef SIGWINCH -/** SIGWINCH handler. */ -static void sighand_winch(int sig) { - int error = errno; - - bfs_bar_getsize(&the_bar); - bfs_bar_resize(&the_bar); - - errno = error; -} -#endif - -/** Reset the scrollable region and hide the bar. */ -static int bfs_bar_reset(struct bfs_bar *bar) { - return ass_puts(bar->fd, - "\0337" // DECSC: Save cursor - "\033[r" // DECSTBM: Reset scrollable region - "\0338" // DECRC: Restore cursor - "\033[J" // ED: Erase display from cursor to end - ); -} - -/** Signal handler for process-terminating signals. */ -static void sighand_reset(int sig) { - bfs_bar_reset(&the_bar); - raise(sig); -} - -/** Register sighand_reset() for a signal. */ -static void reset_before_death_by(int sig) { - struct sigaction sa = { - .sa_handler = sighand_reset, - .sa_flags = SA_RESETHAND, - }; - sigemptyset(&sa.sa_mask); - sigaction(sig, &sa, NULL); -} - -/** printf() to the status bar with a single write(). */ -BFS_FORMATTER(2, 3) -static int bfs_bar_printf(struct bfs_bar *bar, const char *format, ...) { - va_list args; - va_start(args, format); - char *str = dstrvprintf(format, args); - va_end(args); - - if (!str) { - return -1; - } - - int ret = ass_puts(bar->fd, str); - dstrfree(str); - return ret; -} - -struct bfs_bar *bfs_bar_show(void) { - if (the_bar.fd >= 0) { - errno = EBUSY; - goto fail; - } - - char term[L_ctermid]; - ctermid(term); - if (strlen(term) == 0) { - errno = ENOTTY; - goto fail; - } - - the_bar.fd = open(term, O_RDWR | O_CLOEXEC); - if (the_bar.fd < 0) { - goto fail; - } - - if (bfs_bar_getsize(&the_bar) != 0) { - goto fail_close; - } - - reset_before_death_by(SIGABRT); - reset_before_death_by(SIGINT); - reset_before_death_by(SIGPIPE); - reset_before_death_by(SIGQUIT); - reset_before_death_by(SIGTERM); - -#ifdef SIGWINCH - struct sigaction sa = { - .sa_handler = sighand_winch, - .sa_flags = SA_RESTART, - }; - sigemptyset(&sa.sa_mask); - sigaction(SIGWINCH, &sa, NULL); -#endif - - bfs_bar_printf(&the_bar, - "\n" // Make space for the bar - "\0337" // DECSC: Save cursor - "\033[;%ur" // DECSTBM: Set scrollable region - "\0338" // DECRC: Restore cursor - "\033[1A", // CUU: Move cursor up 1 row - (unsigned int)(the_bar.height - 1) - ); - - return &the_bar; - -fail_close: - close_quietly(the_bar.fd); - the_bar.fd = -1; -fail: - return NULL; -} - -unsigned int bfs_bar_width(const struct bfs_bar *bar) { - return bar->width; -} - -int bfs_bar_update(struct bfs_bar *bar, const char *str) { - return bfs_bar_printf(bar, - "\0337" // DECSC: Save cursor - "\033[%u;0f" // HVP: Move cursor to row, column - "\033[K" // EL: Erase line - "\033[7m" // SGR reverse video - "%s" - "\033[27m" // SGR reverse video off - "\0338", // DECRC: Restore cursor - (unsigned int)bar->height, - str - ); -} - -void bfs_bar_hide(struct bfs_bar *bar) { - if (!bar) { - return; - } - - signal(SIGABRT, SIG_DFL); - signal(SIGINT, SIG_DFL); - signal(SIGPIPE, SIG_DFL); - signal(SIGQUIT, SIG_DFL); - signal(SIGTERM, SIG_DFL); -#ifdef SIGWINCH - signal(SIGWINCH, SIG_DFL); -#endif - - bfs_bar_reset(bar); - - xclose(bar->fd); - bar->fd = -1; -} -- cgit v1.2.3