tstatus/bspc.c

/* Copyright (c) 2012, Bastien Dejean
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#define RUNTIME_DIR_ENV "XDG_RUNTIME_DIR"
#define SOCKET_PATH_TPL  "/tmp/bspwm%s_%i_%i-socket"
#define SOCKET_ENV_VAR   "BSPWM_SOCKET"
#define FAILURE_MESSAGE  "\x07"

#define LENGTH(x)         (sizeof(x) / sizeof(*x))

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdarg.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <xcb/xcb.h>
#include <poll.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <ctype.h>

#include "module.h"

/* prototypes */
void warn(char *fmt, ...);
void err(char *fmt, ...);
char *read_string(const char *file_path, size_t *tlen);
char *copy_string(char *str, size_t len);
char *mktempfifo(const char *template);
int asprintf(char **buf, const char *fmt, ...);
int vasprintf(char **buf, const char *fmt, va_list args);
bool is_hex_color(const char *color);

void warn(char *fmt, ...)
{
	va_list ap;
	va_start(ap, fmt);
	vfprintf(stderr, fmt, ap);
	va_end(ap);
}

__attribute__((noreturn))
void err(char *fmt, ...)
{
	va_list ap;
	va_start(ap, fmt);
	vfprintf(stderr, fmt, ap);
	va_end(ap);
	exit(EXIT_FAILURE);
}

char *read_string(const char *file_path, size_t *tlen)
{
	if (file_path == NULL) {
		return NULL;
	}

	int fd = open(file_path, O_RDONLY);

	if (fd == -1) {
		perror("Read file: open");
		return NULL;
	}

	char buf[BUFSIZ], *content = NULL;
	size_t len = sizeof(buf);

	if ((content = calloc(len, sizeof(char))) == NULL) {
		perror("Read file: calloc");
		goto end;
	}

	int nb;
	*tlen = 0;

	while (true) {
		nb = read(fd, buf, sizeof(buf));
		if (nb < 0) {
			perror("Restore tree: read");
			free(content);
			content = NULL;
			goto end;
		} else if (nb == 0) {
			break;
		} else {
			*tlen += nb;
			if (*tlen > len) {
				len *= 2;
				char *rcontent = realloc(content, len * sizeof(char));
				if (rcontent == NULL) {
					perror("Read file: realloc");
					free(content);
					content = NULL;
					goto end;
				} else {
					content = rcontent;
				}
			}
			strncpy(content + (*tlen - nb), buf, nb);
		}
	}

end:
	close(fd);
	return content;
}

char *copy_string(char *str, size_t len)
{
	char *cpy = calloc(1, ((len+1) * sizeof(char)));
	if (cpy == NULL) {
		perror("Copy string: callow");
		return NULL;
	}
	strncpy(cpy, str, len);
	cpy[len] = '\0';
	return cpy;
}

char *mktempfifo(const char *template)
{
	int tempfd;
	char *runtime_dir = getenv(RUNTIME_DIR_ENV);
	if (runtime_dir == NULL) {
		runtime_dir = "/tmp";
	}

	char *fifo_path = malloc(strlen(runtime_dir)+1+strlen(template)+1);
	if (fifo_path == NULL) {
		return NULL;
	}

	sprintf(fifo_path, "%s/%s", runtime_dir, template);

	if ((tempfd = mkstemp(fifo_path)) == -1) {
		free(fifo_path);
		return NULL;
	}

	close(tempfd);
	unlink(fifo_path);

	if (mkfifo(fifo_path, 0666) == -1) {
		free(fifo_path);
		return NULL;
	}

	return fifo_path;
}

int asprintf(char **buf, const char *fmt, ...)
{
	int size = 0;
	va_list args;
	va_start(args, fmt);
	size = vasprintf(buf, fmt, args);
	va_end(args);
	return size;
}

int vasprintf(char **buf, const char *fmt, va_list args)
{
	va_list tmp;
	va_copy(tmp, args);
	int size = vsnprintf(NULL, 0, fmt, tmp);
	va_end(tmp);

	if (size < 0) {
		return -1;
	}

	*buf = malloc(size + 1);

	if (*buf == NULL) {
		return -1;
	}

	size = vsprintf(*buf, fmt, args);
	return size;
}

bool is_hex_color(const char *color)
{
	if (color[0] != '#' || strlen(color) != 7) {
		return false;
	}
	for (int i = 1; i < 7; i++) {
		if (!isxdigit(color[i])) {
			return false;
		}
	}
	return true;
}

char *send_msg_to_bspwm(char *args[], int count)
{
	int sock_fd;
	struct sockaddr_un sock_address;
	char msg[BUFSIZ];
	static char rsp[BUFSIZ];

	sock_address.sun_family = AF_UNIX;
	char *sp;

	if ((sock_fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
		err("Failed to create the socket.\n");
	}

	sp = getenv(SOCKET_ENV_VAR);
	if (sp != NULL) {
		snprintf(sock_address.sun_path, sizeof(sock_address.sun_path), "%s", sp);
	} else {
		char *host = NULL;
		int dn = 0, sn = 0;
		if (xcb_parse_display(NULL, &host, &dn, &sn) != 0) {
			snprintf(sock_address.sun_path, sizeof(sock_address.sun_path), SOCKET_PATH_TPL, host, dn, sn);
		}
		free(host);
	}

	if (connect(sock_fd, (struct sockaddr *) &sock_address, sizeof(sock_address)) == -1) {
		err("Failed to connect to the socket.\n");
	}

	int msg_len = 0;

	for (int offset = 0, rem = sizeof(msg), n = 0; count > 0 && rem > 0; offset += n, rem -= n, count--, args++) {
		n = snprintf(msg + offset, rem, "%s%c", *args, 0);
		msg_len += n;
	}

	if (send(sock_fd, msg, msg_len, 0) == -1) {
		err("Failed to send the data.\n");
	}

	int nb;

	struct pollfd fds[] = {
		{sock_fd, POLLIN, 0},
		{STDOUT_FILENO, POLLHUP, 0},
	};

	while (poll(fds, 2, -1) > 0) {
		if (fds[0].revents & POLLIN) {
			if ((nb = recv(sock_fd, rsp, sizeof(rsp)-1, 0)) > 0) {
				rsp[nb] = '\0';
				return rsp;
			} else {
				break;
			}
		}
		if (fds[1].revents & (POLLERR | POLLHUP)) {
			break;
		}
	}

	close(sock_fd);
	return NULL;
}

int bspwm_update(struct module *module) {
	char current[2];
	char *occupied[] = {"query", "-D", "-d", ".occupied", "--names"};
	char *focused[] = {"query", "-D", "-d", ".focused", "--names"};
	char *result;

	result = send_msg_to_bspwm(occupied, LENGTH(occupied));
	if(!result) {
		printf("error: sending message to bspwm failed!\n");

		return 1;
	}

	memcpy(&module->buffer, result, MODULE_BUFFER_LEN);

	result = send_msg_to_bspwm(focused, LENGTH(focused));
	if(!result) {
		printf("error: sending message to bspwm failed!\n");

		return 1;
	}

	memcpy(&current, result, 2);
	current[1] = '\0';

	for(int i = 0; i < MODULE_BUFFER_LEN; i++) {
		if(module->buffer[i] == '\0' && i) {
			if(*current != '\0' && i <= MODULE_BUFFER_LEN - 2) {
				module->buffer[i - 1] = ' ';
				module->buffer[i] = *current;
				module->buffer[i + 1] = '<';
				module->buffer[i + 2] = '\0';
			} else module->buffer[i - 1] = '\0';
			break;
		}
		if(isdigit(module->buffer[i]) && *current == module->buffer[i]) {
			/* XXX: susceptible to buffer overflow */
			if(i == MODULE_BUFFER_LEN) module->buffer[i + 1] = '<';
			*current = '\0';
		}
		if(module->buffer[i] == '\n')
			module->buffer[i] = ' ';
	}

	return 0;
}