dwmstatus

a simple dwm statusbar updater written in C.
git clone git://git.suckless.org/dwmstatus
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dwmstatus.c (1991B)

      1 #define _BSD_SOURCE
      2 #include <unistd.h>
      3 #include <stdio.h>
      4 #include <stdlib.h>
      5 #include <stdarg.h>
      6 #include <string.h>
      7 #include <strings.h>
      8 #include <sys/time.h>
      9 #include <time.h>
     10 #include <sys/types.h>
     11 #include <sys/wait.h>
     12 
     13 #include <X11/Xlib.h>
     14 
     15 char *tzargentina = "America/Buenos_Aires";
     16 char *tzutc = "UTC";
     17 char *tzberlin = "Europe/Berlin";
     18 
     19 static Display *dpy;
     20 
     21 char *
     22 smprintf(char *fmt, ...)
     23 {
     24 	va_list fmtargs;
     25 	char *ret;
     26 	int len;
     27 
     28 	va_start(fmtargs, fmt);
     29 	len = vsnprintf(NULL, 0, fmt, fmtargs);
     30 	va_end(fmtargs);
     31 
     32 	ret = malloc(++len);
     33 	if (ret == NULL) {
     34 		perror("malloc");
     35 		exit(1);
     36 	}
     37 
     38 	va_start(fmtargs, fmt);
     39 	vsnprintf(ret, len, fmt, fmtargs);
     40 	va_end(fmtargs);
     41 
     42 	return ret;
     43 }
     44 
     45 void
     46 settz(char *tzname)
     47 {
     48 	setenv("TZ", tzname, 1);
     49 }
     50 
     51 char *
     52 mktimes(char *fmt, char *tzname)
     53 {
     54 	char buf[129];
     55 	time_t tim;
     56 	struct tm *timtm;
     57 
     58 	memset(buf, 0, sizeof(buf));
     59 	settz(tzname);
     60 	tim = time(NULL);
     61 	timtm = localtime(&tim);
     62 	if (timtm == NULL) {
     63 		perror("localtime");
     64 		exit(1);
     65 	}
     66 
     67 	if (!strftime(buf, sizeof(buf)-1, fmt, timtm)) {
     68 		fprintf(stderr, "strftime == 0\n");
     69 		exit(1);
     70 	}
     71 
     72 	return smprintf("%s", buf);
     73 }
     74 
     75 void
     76 setstatus(char *str)
     77 {
     78 	XStoreName(dpy, DefaultRootWindow(dpy), str);
     79 	XSync(dpy, False);
     80 }
     81 
     82 char *
     83 loadavg(void)
     84 {
     85 	double avgs[3];
     86 
     87 	if (getloadavg(avgs, 3) < 0) {
     88 		perror("getloadavg");
     89 		exit(1);
     90 	}
     91 
     92 	return smprintf("%.2f %.2f %.2f", avgs[0], avgs[1], avgs[2]);
     93 }
     94 
     95 int
     96 main(void)
     97 {
     98 	char *status;
     99 	char *avgs;
    100 	char *tmar;
    101 	char *tmutc;
    102 	char *tmbln;
    103 
    104 	if (!(dpy = XOpenDisplay(NULL))) {
    105 		fprintf(stderr, "dwmstatus: cannot open display.\n");
    106 		return 1;
    107 	}
    108 
    109 	for (;;sleep(90)) {
    110 		avgs = loadavg();
    111 		tmar = mktimes("%H:%M", tzargentina);
    112 		tmutc = mktimes("%H:%M", tzutc);
    113 		tmbln = mktimes("KW %W %a %d %b %H:%M %Z %Y", tzberlin);
    114 
    115 		status = smprintf("L:%s A:%s U:%s %s",
    116 				avgs, tmar, tmutc, tmbln);
    117 		setstatus(status);
    118 		free(avgs);
    119 		free(tmar);
    120 		free(tmutc);
    121 		free(tmbln);
    122 		free(status);
    123 	}
    124 
    125 	XCloseDisplay(dpy);
    126 
    127 	return 0;
    128 }
    129