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#define _GNU_SOURCE /* program_invocation_name */
#include <assert.h> /* assert(3p) */
#include <errno.h> /* program_invocation_name */
#include <error.h> /* error(3gnu) */
#include <fcntl.h> /* O_* flags to open(3p) */
#include <glob.h> /* glob(3p), globfree(3p), GLOB_* */
#include <signal.h> /* sigaction(3p) */
#include <stdbool.h> /* bool */
#include <stdio.h> /* dprintf(3p) */
#include <stdlib.h> /* exit(3p), malloc(3p) */
#include <string.h> /* strcmp(3p), strlen(3p), strcpy(3p) */
#include <sys/stat.h> /* open(3p) */
#include <unistd.h> /* unlink(3p) */
char *rbar_globescape(const char *lit);
/* Main *************************************************************/
struct impl {
int (*left_click)(void);
int (*middle_click)(void);
int (*right_click)(void);
int (*scroll_up)(void);
int (*scroll_down)(void);
int (*update)(const char *tag);
} impl;
#define errusage(...) do { \
error(6, 0, __VA_ARGS__); \
usage(2); \
exit(2); \
} while(0)
void usage(int fd) {
dprintf(fd,
"Usage: %1$s NN_LABEL\n"
" or: %1$s BTN_ID\n"
" or: %1$s -h\n",
program_invocation_name);
}
void sigexit(int sig) {
error(0, 0, "Caught signal: %d", sig);
exit(0);
}
char *xrd_glob;
size_t xrd_glob_len;
void xrd_cleanup(void) {
free(xrd_glob);
}
void xrd_setup(void) {
char *xrd = getenv("XDG_RUNTIME_DIR");
if (xrd == NULL || xrd[0] == '\0') {
error(6, 0, "XDG_RUNTIME_DIR isn't set");
}
xrd_glob = rbar_globescape(xrd);
xrd_glob_len = strlen(xrd_glob);
atexit(xrd_cleanup);
}
int main(int argc, char *argv[]) {
if (argc != 2) {
errusage("exactly 1 argument expected, got %d", argc-1);
}
const char *arg = argv[1];
if (strcmp(arg, "-h") == 0) {
usage(1);
exit(0);
}
struct sigaction sa = { 0 };
sa.sa_handler = sigexit;
sigaction(SIGHUP, &sa, NULL);
sigaction(SIGINT, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
if ('1' <= arg[0] && arg[0] <= '5' && arg[1] == '\0') {
int (*fn)(void) = NULL;
switch (arg[0]) {
case '1': fn = impl.left_click; break;
case '2': fn = impl.middle_click; break;
case '3': fn = impl.right_click; break;
case '4': fn = impl.scroll_up; break;
case '5': fn = impl.scroll_down; break;
}
xrd_setup();
if (fn == NULL) {
exit(0);
} else {
exit(fn());
}
}
if ('0' <= arg[0] && arg[0] <= '9' &&
'0' <= arg[1] && arg[1] <= '9' &&
arg[2] == '_') {
xrd_setup();
if (impl.update == NULL) {
exit(0);
} else {
exit(impl.update(arg));
}
}
errusage("invalid argument: %s", arg);
}
/* Util *************************************************************/
#define RBAR_DIRGLOB "/wmii*/rbar"
char *rbar_globescape(const char *lit) {
size_t len = 0;
for (const char *a = lit; *a != '\0'; a++) {
switch (*a) {
case '\\': case '*': case '?': case '[':
len++; /* fall through */
default:
len++;
}
}
char *glob = malloc(len+1);
if (!glob)
error(1, errno, "rbar_globescape: malloc");
// copy 'a' to 'b'
char *b = glob;
for (const char *a = lit; *a != '\0'; a++) {
switch (*a) {
case '\\': case '*': case '?': case '[':
*(b++) = '\\'; /* fall through */
default:
*(b++) = *a;
}
}
*b = '\0';
return glob;
}
/* returns 0 or GLOB_NOMATCH */
bool rbar_write(const char *filename, const char *msg) {
char *fullglob = alloca(xrd_glob_len+(sizeof RBAR_DIRGLOB));
strcpy(fullglob, xrd_glob);
strcpy(&fullglob[xrd_glob_len], RBAR_DIRGLOB);
glob_t __attribute__((__cleanup__(globfree))) globbuf = { 0 };
switch (glob(fullglob, GLOB_ONLYDIR|GLOB_NOSORT|GLOB_ERR, NULL, &globbuf)) {
case GLOB_NOSPACE:
error(1, ENOMEM, "rbar_write"); assert(0);
case GLOB_ABORTED:
error(1, errno, "rbar_write: glob"); assert(0);
case GLOB_NOMATCH:
return false;
}
const size_t filenamelen = strlen(filename);
const size_t msglen = strlen(msg);
for (size_t i = 0; i < globbuf.gl_pathc; i++) {
const char *dirname = globbuf.gl_pathv[i];
const size_t dirnamelen = strlen(dirname);
char *fullname = alloca(dirnamelen+1+filenamelen+1);
strcpy(fullname, dirname);
fullname[dirnamelen] = '/';
strcpy(&fullname[dirnamelen+1], filename);
int fd = open(fullname, O_WRONLY|O_APPEND|O_CREAT, 0666);
if (fd < 0) {
error(0, errno, "open: %s", fullname);
continue;
}
if (write(fd, msg, msglen) < (ssize_t)msglen)
error(0, errno, "write: %s", fullname);
close(fd);
}
return true;
}
void rbar_remove(const char *fileglob) {
char *fullglob = alloca(xrd_glob_len+(sizeof RBAR_DIRGLOB)+strlen(fileglob)+1);
strcpy(fullglob, xrd_glob);
strcpy(&fullglob[xrd_glob_len], RBAR_DIRGLOB);
fullglob[xrd_glob_len+(sizeof RBAR_DIRGLOB)-1] = '/';
strcpy(&fullglob[xrd_glob_len+(sizeof RBAR_DIRGLOB)], fileglob);
glob_t __attribute__((__cleanup__(globfree))) globbuf = { 0 };
if (glob(fullglob, GLOB_NOSORT, NULL, &globbuf) != 0)
return;
for (size_t i = 0; i < globbuf.gl_pathc; i++) {
unlink(globbuf.gl_pathv[i]);
}
}
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