README: Add list of non-portable functions

[slstatus.git] / slstatus.c

diff --git a/slstatus.c b/slstatus.c
index 9cd5ae2..19bc127 100644 (file)
--- a/slstatus.c
+++ b/slstatus.c
@@ -1,443 +1,127 @@
 /* See LICENSE file for copyright and license details. */
 /* See LICENSE file for copyright and license details. */

-
-/* global libraries */
-#include <alsa/asoundlib.h>
-#include <arpa/inet.h>
-#include <fcntl.h>
-#include <ifaddrs.h>
+#include <err.h>
+#include <errno.h>

 #include <locale.h>
 #include <locale.h>

-#include <netdb.h>
-#include <stdarg.h>
+#include <signal.h>

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/statvfs.h>
-#include <sys/socket.h>

 #include <time.h>
 #include <time.h>

-#include <unistd.h>

 #include <X11/Xlib.h>
 
 #include <X11/Xlib.h>
 

-/* local headers */
+#include "arg.h"

 #include "slstatus.h"
 #include "slstatus.h"

-#include "config.h"
-
-/* set statusbar */
-void
-setstatus(const char *str)
-{
-    /* set WM_NAME via X11 */
-    XStoreName(dpy, DefaultRootWindow(dpy), str);
-    XSync(dpy, False);
-}
-
-/* smprintf function */
-char *
-smprintf(const char *fmt, ...)
-{
-    va_list fmtargs;
-    char *ret = NULL;
-
-    va_start(fmtargs, fmt);
-    if (vasprintf(&ret, fmt, fmtargs) < 0)
-        return NULL;
-    va_end(fmtargs);
-
-    return ret;
-}
-
-/* battery percentage */
-char *
-battery_perc(const char *battery)
-{
-    int now, full, perc;
-    char batterynowfile[64] = "";
-    char batteryfullfile[64] = "";
-    FILE *fp;
+#include "util.h"

 
 

-    /* generate battery nowfile path */
-    strcat(batterynowfile, batterypath);
-    strcat(batterynowfile, battery);
-    strcat(batterynowfile, "/");
-    strcat(batterynowfile, batterynow);
+struct arg {
+       const char *(*func)();
+       const char *fmt;
+       const char *args;
+};

 
 

-    /* generate battery fullfile path */
-    strcat(batteryfullfile, batterypath);
-    strcat(batteryfullfile, battery);
-    strcat(batteryfullfile, "/");
-    strcat(batteryfullfile, batteryfull);
-
-    /* open battery now file */
-    if (!(fp = fopen(batterynowfile, "r"))) {
-        fprintf(stderr, "Error opening battery file.%s",batterynowfile);
-        return smprintf("n/a");
-    }
-
-    /* read value */
-    fscanf(fp, "%i", &now);
-
-    /* close battery now file */
-    fclose(fp);
-
-    /* open battery full file */
-    if (!(fp = fopen(batteryfullfile, "r"))) {
-        fprintf(stderr, "Error opening battery file.");
-        return smprintf("n/a");
-    }
-
-    /* read value */
-    fscanf(fp, "%i", &full);
-
-    /* close battery full file */
-    fclose(fp);
-
-    /* calculate percent */
-    perc = now / (full / 100);
-
-    /* return perc as string */
-    return smprintf("%d%%", perc);
-}
-
-/* cpu percentage */
-char *
-cpu_perc(const char *null)
-{
-    int perc;
-    long double a[4], b[4];
-    FILE *fp;
+char *argv0;
+char buf[1024];
+static unsigned short int done;
+static Display *dpy;

 
 

-    /* open stat file */
-    if (!(fp = fopen("/proc/stat","r"))) {
-        fprintf(stderr, "Error opening stat file.");
-        return smprintf("n/a");
-    }
-
-    /* read values */
-    fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2], &a[3]);
-
-    /* close stat file */
-    fclose(fp);
-
-    /* wait a second (for avg values) */
-    sleep(1);
-
-    /* open stat file */
-    if (!(fp = fopen("/proc/stat","r"))) {
-        fprintf(stderr, "Error opening stat file.");
-        return smprintf("n/a");
-    }
-
-    /* read values */
-    fscanf(fp, "%*s %Lf %Lf %Lf %Lf", &b[0], &b[1], &b[2], &b[3]);
-
-    /* close stat file */
-    fclose(fp);
-
-    /* calculate avg in this second */
-    perc = 100 * ((b[0]+b[1]+b[2]) - (a[0]+a[1]+a[2])) / ((b[0]+b[1]+b[2]+b[3]) - (a[0]+a[1]+a[2]+a[3]));
-
-    /* return perc as string */
-    return smprintf("%d%%", perc);
-}
-
-/* date and time */
-char *
-datetime(const char *timeformat)
-{
-    time_t tm;
-    size_t bufsize = 64;
-    char *buf = malloc(bufsize);
-
-    /* get time in format */
-    time(&tm);
-    setlocale(LC_TIME, "");
-    if(!strftime(buf, bufsize, timeformat, localtime(&tm))) {
-        setlocale(LC_TIME, "C");
-        fprintf(stderr, "Strftime failed.\n");
-        return smprintf("n/a");
-    }
-
-    setlocale(LC_TIME, "C");
-    /* return time */
-    char *ret = smprintf("%s", buf);
-    free(buf);
-    return ret;
-}
-
-/* disk usage percentage */
-char *
-disk_perc(const char *mountpoint)
-{
-    int perc = 0;
-    struct statvfs fs;
-
-    /* try to open mountpoint */
-    if (statvfs(mountpoint, &fs) < 0) {
-        fprintf(stderr, "Could not get filesystem info.\n");
-        return smprintf("n/a");
-    }
-
-    /* calculate percent */
-    perc = 100 * (1.0f - ((float)fs.f_bavail / (float)fs.f_blocks));
-
-    /* return perc */
-    return smprintf("%d%%", perc);
-}
-
-/* entropy available */
-char *
-entropy(const char *null)
-{
-    int entropy = 0;
-    FILE *fp;
-
-    /* open entropy file */
-    if (!(fp = fopen("/proc/sys/kernel/random/entropy_avail", "r"))) {
-        fprintf(stderr, "Could not open entropy file.\n");
-        return smprintf("n/a");
-    }
-
-    /* extract entropy */
-    fscanf(fp, "%d", &entropy);
-
-    /* close entropy file */
-    fclose(fp);
-
-    /* return entropy */
-    return smprintf("%d", entropy);
-}
-
-/* ip address */
-char *
-ip(const char *interface)
-{
-    struct ifaddrs *ifaddr, *ifa;
-    int s;
-    char host[NI_MAXHOST];
-
-    /* check if getting ip address works */
-    if (getifaddrs(&ifaddr) == -1)
-    {
-        fprintf(stderr, "Error getting IP address.");
-        return smprintf("n/a");
-    }
-
-    /* get the ip address */
-    for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next)
-    {
-        if (ifa->ifa_addr == NULL)
-            continue;
-
-        s = getnameinfo(ifa->ifa_addr, sizeof(struct sockaddr_in), host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
-
-        if ((strcmp(ifa->ifa_name, interface) == 0) && (ifa->ifa_addr->sa_family == AF_INET))
-        {
-            if (s != 0)
-            {
-                fprintf(stderr, "Error getting IP address.");
-                return smprintf("n/a");
-            }
-            return smprintf("%s", host);
-        }
-    }
-
-    /* free the address */
-    freeifaddrs(ifaddr);
-
-    /* return n/a if nothing works */
-    return smprintf("n/a");
-}
-
-/* ram percentage */
-char *
-ram_perc(const char *null)
-{
-    int perc;
-    long total, free, buffers, cached;
-    FILE *fp;
-
-    /* open meminfo file */
-    if (!(fp = fopen("/proc/meminfo", "r"))) {
-        fprintf(stderr, "Error opening meminfo file.");
-        return smprintf("n/a");
-    }
-
-    /* read the values */
-    fscanf(fp, "MemTotal: %ld kB\n", &total);
-    fscanf(fp, "MemFree: %ld kB\n", &free);
-    fscanf(fp, "MemAvailable: %ld kB\nBuffers: %ld kB\n", &buffers, &buffers);
-    fscanf(fp, "Cached: %ld kB\n", &cached);
-
-    /* close meminfo file */
-    fclose(fp);
-
-    /* calculate percentage */
-    perc = 100 * ((total - free) - (buffers + cached)) / total;
-
-    /* return perc as string */
-    return smprintf("%d%%", perc);
-}
+#include "config.h"

 
 

-/* temperature */
-char *
-temp(const char *file)
+static void
+terminate(const int signo)

 {
 {

-    int temperature;
-    FILE *fp;
-
-    /* open temperature file */
-    if (!(fp = fopen(file, "r"))) {
-        fprintf(stderr, "Could not open temperature file.\n");
-        return smprintf("n/a");
-    }
-
-    /* extract temperature */
-    fscanf(fp, "%d", &temperature);
+       (void)signo;

 
 

-    /* close temperature file */
-    fclose(fp);
-
-    /* return temperature in degrees */
-    return smprintf("%d°C", temperature / 1000);
+       done = 1;

 }
 
 }
 

-/* alsa volume percentage */
-char *
-vol_perc(const char *soundcard)
+static void
+difftimespec(struct timespec *res, struct timespec *a, struct timespec *b)

 {
 {

-    int mute = 0;
-    long vol = 0, max = 0, min = 0;
-
-    /* get volume from alsa */
-    snd_mixer_t *handle;
-    snd_mixer_elem_t *pcm_mixer, *mas_mixer;
-    snd_mixer_selem_id_t *vol_info, *mute_info;
-    snd_mixer_open(&handle, 0);
-    snd_mixer_attach(handle, soundcard);
-    snd_mixer_selem_register(handle, NULL, NULL);
-    snd_mixer_load(handle);
-    snd_mixer_selem_id_malloc(&vol_info);
-    snd_mixer_selem_id_malloc(&mute_info);
-    snd_mixer_selem_id_set_name(vol_info, channel);
-    snd_mixer_selem_id_set_name(mute_info, channel);
-    pcm_mixer = snd_mixer_find_selem(handle, vol_info);
-    mas_mixer = snd_mixer_find_selem(handle, mute_info);
-    snd_mixer_selem_get_playback_volume_range((snd_mixer_elem_t *)pcm_mixer, &min, &max);
-    snd_mixer_selem_get_playback_volume((snd_mixer_elem_t *)pcm_mixer, SND_MIXER_SCHN_MONO, &vol);
-    snd_mixer_selem_get_playback_switch(mas_mixer, SND_MIXER_SCHN_MONO, &mute);
-    if (vol_info)
-        snd_mixer_selem_id_free(vol_info);
-    if (mute_info)
-        snd_mixer_selem_id_free(mute_info);
-    if (handle)
-        snd_mixer_close(handle);
-
-    /* return the string (mute) */
-    if (!mute)
-        return smprintf("mute");
-    else
-        return smprintf("%d%%", (vol * 100) / max);
+       res->tv_sec = a->tv_sec - b->tv_sec - (a->tv_nsec < b->tv_nsec);
+       res->tv_nsec = a->tv_nsec - b->tv_nsec +
+                      (a->tv_nsec < b->tv_nsec) * 1000000000;

 }
 
 }
 

-/* wifi percentage */
-char *
-wifi_perc(const char *wificard)
+static void
+usage(void)

 {
 {

-    int bufsize = 255;
-    int strength;
-    char buf[bufsize];
-    char *datastart;
-    char path[64];
-    char status[5];
-    char needle[sizeof wificard + 1];
-    FILE *fp;
-
-    /* generate the path name */
-    memset(path, 0, sizeof path);
-    strcat(path, "/sys/class/net/");
-    strcat(path, wificard);
-    strcat(path, "/operstate");
-
-    /* open wifi file */
-    if(!(fp = fopen(path, "r"))) {
-        fprintf(stderr, "Error opening wifi operstate file.");
-        return smprintf("n/a");
-    }
-
-    /* read the status */
-    fgets(status, 5, fp);
-
-    /* close wifi file */
-    fclose(fp);
-
-    /* check if interface down */
-    if(strcmp(status, "up\n") != 0){
-        return smprintf("n/a");
-    }
-
-    /* open wifi file */
-    if (!(fp = fopen("/proc/net/wireless", "r"))) {
-        fprintf(stderr, "Error opening wireless file.");
-        return smprintf("n/a");
-    }
-
-    /* extract the signal strength */
-    strcpy(needle, wificard);
-    strcat(needle, ":");
-    fgets(buf, bufsize, fp);
-    fgets(buf, bufsize, fp);
-    fgets(buf, bufsize, fp);
-    if ((datastart = strstr(buf, needle)) != NULL) {
-        datastart = strstr(buf, ":");
-        sscanf(datastart + 1, " %*d   %d  %*d  %*d        %*d      %*d      %*d      %*d      %*d        %*d", &strength);
-    }
-
-    /* close wifi file */
-    fclose(fp);
-
-    /* return strength in percent */
-    return smprintf("%d%%", strength);
+       fprintf(stderr, "usage: %s [-s]\n", argv0);
+       exit(1);

 }
 
 }
 

-/* main function */

 int
 int

-main()
+main(int argc, char *argv[])

 {
 {

-    char status_string[1024];
-    struct arg argument;
-
-    /* try to open display */
-    if (!(dpy = XOpenDisplay(0x0))) {
-        fprintf(stderr, "Cannot open display!\n");
-        exit(1);
-    }
-
-    /* return status every interval */
-    for (;;) {
-        /* clear the string */
-        memset(status_string, 0, sizeof(status_string));
-
-        /* generate status_string */
-        for (size_t i = 0; i < sizeof(args) / sizeof(args[0]); ++i) {
-            argument = args[i];
-            char *res = argument.func(argument.args);
-            char *element = smprintf(argument.format, res);
-            strcat(status_string, element);
-            free(res);
-            free(element);
-        }
-
-        /* return the statusbar */
-        setstatus(status_string);
-
-        /* wait, "update_interval - 1" because of get_cpu_usage() which uses 1 second */
-        sleep(update_interval -1);
-    }
-
-    /* close display */
-    XCloseDisplay(dpy);
-
-    /* exit successfully */
-    return 0;
+       struct sigaction act;
+       struct timespec start, current, diff, intspec, wait;
+       size_t i, len;
+       int sflag = 0;
+       char status[MAXLEN];
+
+       ARGBEGIN {
+               case 's':
+                       sflag = 1;
+                       break;
+               default:
+                       usage();
+       } ARGEND
+
+       if (argc) {
+               usage();
+       }
+
+       setlocale(LC_ALL, "");
+
+       memset(&act, 0, sizeof(act));
+       act.sa_handler = terminate;
+       sigaction(SIGINT,  &act, NULL);
+       sigaction(SIGTERM, &act, NULL);
+
+       if (!sflag && !(dpy = XOpenDisplay(NULL))) {
+               fprintf(stderr, "slstatus: cannot open display");
+               return 1;
+       }
+
+       while (!done) {
+               clock_gettime(CLOCK_MONOTONIC, &start);
+
+               status[0] = '\0';
+               for (i = len = 0; i < LEN(args); i++) {
+                       const char * res = args[i].func(args[i].args);
+                       res = (res == NULL) ? unknown_str : res;
+                       len += snprintf(status + len, sizeof(status) - len,
+                                       args[i].fmt, res);
+
+                       if (len >= sizeof(status)) {
+                               status[sizeof(status) - 1] = '\0';
+                       }
+               }
+
+               if (sflag) {
+                       printf("%s\n", status);
+               } else {
+                       XStoreName(dpy, DefaultRootWindow(dpy), status);
+                       XSync(dpy, False);
+               }
+
+               if (!done) {
+                       clock_gettime(CLOCK_MONOTONIC, &current);
+                       difftimespec(&diff, &current, &start);
+
+                       intspec.tv_sec = interval / 1000;
+                       intspec.tv_nsec = (interval % 1000) * 1000000;
+                       difftimespec(&wait, &intspec, &diff);
+
+                       if (wait.tv_sec >= 0) {
+                               nanosleep(&wait, NULL);
+                       }
+               }
+       }
+
+       if (!sflag) {
+               XStoreName(dpy, DefaultRootWindow(dpy), NULL);
+               XCloseDisplay(dpy);
+       }
+
+       return 0;

 }
 }