/*
+ * display outputs, per line:
+ *
+ * Remaining: | Empty: | Degraded:
+ * green | red | black discharging
+ * blue | red | black charging
+ * cyan | red | black charged
+ * grey | red | black charging&discharching!
+ * green | yellow | black discharging - low!
+ * blue | yellow | black charging - low
+ * cyan | yellow | black charged - low [1]
+ * grey | yellow | black charging&discharching! - low [1]
+ * ... dark grey ... no batteries present
+ *
+ * [1] battery must be quite badly degraded
*/
#include <stdio.h>
+#include <assert.h>
#include <math.h>
#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
#include <unistd.h>
+#include <ctype.h>
+
+#include <sys/types.h>
+#include <dirent.h>
#include <X11/Xlib.h>
+/*---------- general utility stuff and declarations ----------*/
+
static void fail(const char *m) {
fprintf(stderr,"error: %s\n", m);
sleep(5);
}
static void badusage(void) { fail("bad usage"); }
-static Display *d;
-static Window w;
+#define CHGST_DISCHARGING 0 /* Reflects order in E(state,charging_state) */
+#define CHGST_CHARGING 1 /* in fields table. Also, much code assumes */
+#define CHGST_CHARGED 2 /* exactly these three possible states. */
+
+/*---------- structure of and results from /proc/acpi/battery/... ----------*/
+/* variables thisbat_... are the results from readbattery();
+ * if readbattery() succeeds they are all valid and not VAL_NOTFOUND
+ */
+
+typedef struct batinfo_field {
+ const char *file;
+ const char *label;
+ unsigned long *valuep;
+ const char *unit;
+ const char *enumarray[10];
+} batinfo_field;
+
+#define QUANTITY_FIELDS \
+ QF(info, design_capacity, "mWh") \
+ QF(info, last_full_capacity, "mWh") \
+ QF(state, present_rate, "mW") \
+ QF(state, remaining_capacity, "mWh") \
+ QF(alarm, alarm, "mWh")
+
+#define QF(f,l,u) static unsigned long thisbat_##f##_##l;
+ QUANTITY_FIELDS
+#undef QF
+
+static unsigned long thisbat_info_present, thisbat_state_present;
+static unsigned long thisbat_state_charging_state;
+
+#define VAL_NOTFOUND (~0UL)
+
+static const batinfo_field fields[]= {
+#define E(f,l) #f, #l, &thisbat_##f##_##l, 0
+#define QF(f,l,u) { #f, #l, &thisbat_##f##_##l, u },
+ { E(info, present), { "no", "yes" } },
+ { E(state,present), { "no", "yes" } },
+ { E(state,charging_state), { "discharging charging charged" } },
+ QUANTITY_FIELDS /* take care re charging_state values order - */
+ { 0 } /* if you must change it, search for CHGST_... */
+#undef E
+#undef QF
+};
+
+static const char *files[]= { "info", "state", "alarm" };
+
+/*---------- parsing of one battery in /proc/acpi/battery/... ----------*/
+
+/* variables private to the parser and its error handlers */
+static char batlinebuf[1000];
+static FILE *batfile;
+static const char *batdirname;
+static const char *batfilename;
+static const char *batlinevalue;
+
+static int batfailf(const char *why) {
+ if (batlinevalue) {
+ fprintf(stderr,"battery/%s/%s: %s value `%s': %s\n",
+ batdirname,batfilename, batlinebuf,batlinevalue,why);
+ } else {
+ fprintf(stderr,"battery/%s/%s: %s: `%s'\n",
+ batdirname,batfilename, why, batlinebuf);
+ }
+ return -1;
+}
+
+static int batfaile(const char *syscall, const char *target) {
+ fprintf(stderr,"battery/%s: failed to %s %s: %s\n",
+ batdirname ? batdirname : "*", syscall, target, strerror(errno));
+ return -1;
+}
+
+static void chdir_base(void) {
+ int r;
+
+ r= chdir("/proc/acpi/battery");
+ if (r) batfaile("chdir","/proc/acpi/battery");
+}
+
+static void tidybattery(void) {
+ if (batfile) { fclose(batfile); batfile=0; }
+ if (batdirname) { chdir_base(); batdirname=0; }
+}
+
+static int readbattery(void) { /* 0=>ok, -1=>couldn't */
+ const batinfo_field *field;
+ const char *const *cfilename, *const *enumsearch;
+ char *colon, *ep;
+ int r, l, missing;
+
+ r= chdir(batdirname);
+ if (r) return batfaile("chdir",batdirname);
+
+ for (field=fields; field->file; field++)
+ *field->valuep= VAL_NOTFOUND;
+
+ for (cfilename=files;
+ (batfilename= *cfilename);
+ cfilename++) {
+ batfile= fopen(batfilename,"r");
+ if (!batfile) return batfaile("open",batfilename);
+
+ for (;;) {
+ batlinevalue= 0;
+
+ fgets(batlinebuf,sizeof(batlinebuf),batfile);
+ if (ferror(batfile)) return batfaile("read",batfilename);
+ l= strlen(batlinebuf);
+ if (l==0 && feof(batfile)) break;
+ assert(l>0);
+ if (batlinebuf[l-1] != '\n')
+ return batfailf("line too long");
+ batlinebuf[l-1]= 0;
+ colon= strchr(batlinebuf,':');
+ if (!colon)
+ return batfailf("line without a colon");
+ *colon= 0;
+
+ for (field=fields; ; field++) {
+ if (!strcmp(field->file,batfilename) &&
+ !strcmp(field->label,batlinebuf))
+ goto label_interesting;
+ }
+ continue;
+
+ label_interesting:
+ for (batlinevalue= colon+1;
+ *batlinevalue && isspace((unsigned char)*batlinevalue);
+ batlinevalue++);
+
+ if (field->unit) {
+
+ *field->valuep= strtoul(batlinevalue,&ep,10);
+ if (ep==batlinevalue || *ep!=' ')
+ batfailf("value number syntax incorrect");
+ if (strcmp(ep+1,field->unit)) batfailf("incorrect unit");
+
+ } else {
+
+ for (*field->valuep=0, enumsearch=field->enumarray;
+ *enumsearch && strcmp(*enumsearch,batlinevalue);
+ (*field->valuep)++, enumsearch++);
+ if (!*enumsearch)
+ batfailf("unknown enum value");
+
+ }
+ }
+
+ fclose(batfile);
+ batfile= 0;
+ }
+
+ r= chdir(batdirname);
+ if (r) return batfaile("chdir","..");
+ batdirname= 0;
+
+ for (field=fields, missing=0;
+ field->file;
+ field++) {
+ if (*field->valuep == VAL_NOTFOUND) {
+ fprintf(stderr,"battery/%s/%s: %s: not found\n",
+ batdirname, field->file,field->label);
+ missing++;
+ }
+ }
+ if (missing) return -1;
+
+ return 0;
+}
+
+/*---------- data collection and analysis ----------*/
+
+/* These next three variables are the results of the charging state */
+static unsigned charging_state_mask; /* 1u<<CHGST_* | ... */
+static double nondegraded_norm, fill_norm, ratepersec_norm;
+static int alarm_level; /* 0=ok, 1=low */
+
+#define QF(f,l,u) \
+ static double total_##f##_##l;
+ QUANTITY_FIELDS
+#undef QF
+
+static void acquiredata(void) {
+ DIR *di;
+ struct dirent *de;
+ int r;
+
+ charging_state_mask= 0;
+
+#define QF(f,l,u) \
+ total_##f##_##l= 0;
+ QUANTITY_FIELDS
+#undef QF
+
+ di= opendir("."); if (!di) batfaile("opendir","battery");
+ while ((de= readdir(di))) {
+ if (de->d_name[0]==0 || de->d_name[0]=='.') continue;
+
+ batdirname= de->d_name;
+ r= readbattery();
+ tidybattery();
+
+ if (r) continue;
+
+ if (!thisbat_info_present || !thisbat_state_present) {
+ printf("battery/%s not present\n",de->d_name);
+ continue;
+ }
+
+ charging_state_mask |= 1u << thisbat_state_charging_state;
+
+#define QF(f,l,u) \
+ total_##f##_##l += thisbat_##f##_##l;
+ QUANTITY_FIELDS
+#undef QF
+
+ if (thisbat_state_charging_state == CHGST_DISCHARGING)
+ /* negate it */
+ total_state_present_rate -= 2.0 * thisbat_state_present_rate;
+
+ }
+ closedir(di);
+
+ if (total_info_design_capacity < 0.5)
+ total_info_design_capacity= 1.0;
+
+ if (total_info_last_full_capacity < total_state_remaining_capacity)
+ total_info_last_full_capacity= total_state_remaining_capacity;
+ if (total_info_design_capacity < total_info_last_full_capacity)
+ total_info_design_capacity= total_info_last_full_capacity;
+
+ alarm_level=
+ (total_state_remaining_capacity < total_alarm_alarm &&
+ !(charging_state_mask & 1u << CHGST_CHARGING));
+
+ nondegraded_norm= total_info_last_full_capacity / total_info_design_capacity;
+ fill_norm= total_state_remaining_capacity / total_info_design_capacity;
+ ratepersec_norm= total_state_present_rate
+ / (3600.0 * total_info_design_capacity);
+}
+
+static void initacquire(void) {
+ chdir_base();
+}
+
+/*---------- display ----------*/
+
+#define TOP 60
+#define BOTTOM 3600
+
+#define COLOURS \
+ C(black) \
+ C(green) \
+ C(red) \
+ C(yellow) \
+ C(blue) \
+ C(cyan) \
+ C(grey) \
+ C(darkgrey) \
+ GC(remain) \
+ GC(empty)
+
+static Display *disp;
+static Window win;
static int width, height;
-static GC gc_green, gc_red, gc_yellow, gc_blue;
static Colormap cmap;
static int screen;
+static unsigned long lastbackground;
-#define TOP 60
-#define BOTTOM 3600
+typedef struct {
+ GC gc;
+ unsigned long lastfg;
+} Gcstate;
+
+#define C(c) static unsigned long pix_##c;
+#define GC(g) static Gcstate gc_##g;
+ COLOURS
+#undef C
+#undef GC
static void refresh(void);
-static void geometry(void) {
- int dummy;
- Window dummyw;
+#define CHGMASK_CHG_DIS (1u<<CHGST_CHARGING | 1u<<CHGST_DISCHARGING)
+
+static void setbackground(unsigned long newbg) {
+ int r;
- XGetGeometry(d,w, &dummyw,&dummy,&dummy, &width,&height, &dummy,&dummy);
- refresh();
+ if (newbg == lastbackground) return;
+ r= XSetWindowBackground(disp,win,newbg);
+ if (r) fail("XSetWindowBackground");
+ lastbackground= newbg;
}
-static void show(double fill_norm, double ratepersec_norm, int ac) {
+static void setforeground(Gcstate *g, unsigned long px) {
+ XGCValues gcv;
+ int r;
+
+ if (g->lastfg == px) return;
+
+ memset(&gcv,0,sizeof(gcv));
+ g->lastfg= gcv.foreground= px;
+ r= XChangeGC(disp,g->gc,GCForeground,&gcv);
+ if (r) fail("XChangeGC");
+}
+
+static void show(void) {
double elap, then;
- int i, leftmost_lit;
+ int i, leftmost_lit, leftmost_nondeg;
+
+ if (!charging_state_mask) {
+ setbackground(pix_darkgrey);
+ XClearWindow(disp,win);
+ return;
+ }
+
+ setbackground(pix_black);
+ XClearWindow(disp,win);
+
+ setforeground(&gc_remain,
+ !(charging_state_mask & CHGMASK_CHG_DIS) ? pix_cyan :
+ !(~charging_state_mask & CHGMASK_CHG_DIS) ? pix_grey :
+ charging_state_mask & (1u<<CHGST_CHARGING)
+ ? pix_blue : pix_green);
+
+ setforeground(&gc_empty, alarm_level ? pix_yellow : pix_red);
for (i=0; i<height; i++) {
elap= !i ? 0 :
TOP * exp( (double)i / (height-2) * log( (double)BOTTOM/TOP ) );
then= fill_norm + ratepersec_norm * elap;
+ if (then <= 0.0) then= 0.0;
+ else if (then >= nondegraded_norm) then= nondegraded_norm;
- leftmost_lit= then <= 0 ? -1 :
- then >= 1.0 ? width :
- width * then;
+ leftmost_lit= width * then;
+ leftmost_nondeg= width * nondegraded_norm;
if (leftmost_lit >= 0)
- XDrawLine(d, w, ac ? gc_blue : gc_green, 0,i, leftmost_lit,i);
- if (leftmost_lit < width)
- XDrawLine(d, w, then >= 0 ? gc_red : gc_yellow,
- leftmost_lit+1,i, width,i);
+ XDrawLine(disp, win, gc_remain.gc, 0,i, leftmost_lit,i);
+ if (leftmost_lit < leftmost_nondeg)
+ XDrawLine(disp, win, gc_empty.gc,
+ leftmost_lit+1,i, leftmost_nondeg,i);
}
}
-static void refresh(void) {
- show(0.3, 0.5/3600, 1);
+static void initgc(Gcstate *gc_r) {
+ XGCValues gcv;
+
+ memset(&gcv,0,sizeof(gcv));
+ gcv.function= GXcopy;
+ gcv.line_width= 1;
+ gc_r->lastfg= gcv.foreground= pix_black;
+ gc_r->gc= XCreateGC(disp,win, GCFunction|GCLineWidth|GCForeground, &gcv);
}
-static void colour(GC *gc_r, const char *name) {
+static void colour(unsigned long *pix_r, const char *name) {
XColor xc;
Status st;
- XGCValues gcv;
- st= XAllocNamedColor(d,cmap,name,&xc,&xc);
+ st= XAllocNamedColor(disp,cmap,name,&xc,&xc);
if (!st) fail("couldn't allocate colour");
- gcv.function= GXcopy;
- gcv.line_width= 1;
- gcv.foreground= xc.pixel;
- *gc_r= XCreateGC(d,w, GCFunction|GCForeground|GCLineWidth, &gcv);
+ *pix_r= xc.pixel;
}
-int main(int argc, const char *const *argv) {
- XEvent ev;
+static void initgraphics(void) {
+ int r;
- d= XOpenDisplay(0); if (!d) fail("could not open display");
+ disp= XOpenDisplay(0); if (!disp) fail("could not open display");
- if (!argv[0] || argv[1])
- badusage();
+ screen= DefaultScreen(disp);
+ win= XCreateSimpleWindow(disp,DefaultRootWindow(disp),0,0,100,20,0,0,0);
+ cmap= DefaultColormap(disp,screen);
+
+#define C(c) colour(&pix_##c, #c);
+#define GC(g) initgc(&gc_##g);
+ COLOURS
+#undef C
+#undef GC
- screen= DefaultScreen(d);
+ r= XSetWindowBackground(disp,win,pix_black);
+ if (r) fail("init set background");
+ lastbackground= pix_black;
- w= XCreateSimpleWindow(d,DefaultRootWindow(d),0,0,100,20,0,0,0);
+ XSelectInput(disp,win, ExposureMask|VisibilityChangeMask);
+ XMapWindow(disp,win);
+}
+
+static void refresh(void) {
+ acquiredata();
+ show();
+}
- cmap= DefaultColormap(d,screen);
+static void newgeometry(void) {
+ int dummy;
+ Window dummyw;
- colour(&gc_green, "green");
- colour(&gc_red, "red");
- colour(&gc_yellow, "yellow");
- colour(&gc_blue, "blue");
+ XGetGeometry(disp,win, &dummyw,&dummy,&dummy, &width,&height, &dummy,&dummy);
+ refresh();
+}
- XSelectInput(d,w, ExposureMask|VisibilityChangeMask);
- XMapWindow(d,w);
+static void eventloop(void) {
+ XEvent ev;
- geometry();
+ newgeometry();
for (;;) {
- XNextEvent(d,&ev);
- geometry();
+ XNextEvent(disp,&ev);
+ newgeometry();
}
}
+
+int main(int argc, const char *const *argv) {
+ if (!argv[0] || argv[1])
+ badusage();
+
+ initacquire();
+ initgraphics();
+ eventloop();
+ return 0;
+}
~ian / chiark-utils.git / commitdiff