[slstatus][patch][dyn-battery] Another code rewrite - sites - public wiki contents of suckless.org
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---
DIR commit c0b2b64ad8150a4afcd88e80a1d85644cfcc0fda
DIR parent f53eb24e58e0bdcb2afc3adf6afeec2333073bfe
HTML Author: Lukas Lynch <madi@mxdi.xyz>
Date: Wed, 18 Feb 2026 16:30:07 -0800
[slstatus][patch][dyn-battery] Another code rewrite
Diffstat:
M tools.suckless.org/slstatus/patche… | 2 +-
D tools.suckless.org/slstatus/patche… | 185 ------------------------------
A tools.suckless.org/slstatus/patche… | 141 +++++++++++++++++++++++++++++++
3 files changed, 142 insertions(+), 186 deletions(-)
---
DIR diff --git a/tools.suckless.org/slstatus/patches/dyn-battery/index.md b/tools.suckless.org/slstatus/patches/dyn-battery/index.md
@@ -14,7 +14,7 @@ state (%s), capacity (%s). Example:
Download
--------
-* [slstatus-dyn_battery-20260102-8723e8b.diff](slstatus-dyn_battery-20260102-8723e8b.diff)
+* [slstatus-dyn_battery-20260218-614c275.diff](slstatus-dyn_battery-20260218-614c275.diff)
Author
------
DIR diff --git a/tools.suckless.org/slstatus/patches/dyn-battery/slstatus-dyn_battery-20260102-8723e8b.diff b/tools.suckless.org/slstatus/patches/dyn-battery/slstatus-dyn_battery-20260102-8723e8b.diff
@@ -1,185 +0,0 @@
-From 6316c8cb7b2b92098907943223ffe1a748359146 Mon Sep 17 00:00:00 2001
-From: Madison Lynch <madi@mxdi.xyz>
-Date: Fri, 2 Jan 2026 04:33:17 -0800
-Subject: [PATCH] Code refactor + Improved memory safety
-
----
- Makefile | 1 +
- components/dyn_battery.c | 124 +++++++++++++++++++++++++++++++++++++++
- config.def.h | 1 +
- slstatus.h | 3 +
- 4 files changed, 129 insertions(+)
- create mode 100644 components/dyn_battery.c
-
-diff --git a/Makefile b/Makefile
-index 7a18274..d1b24dd 100644
---- a/Makefile
-+++ b/Makefile
-@@ -11,6 +11,7 @@ COM =\
- components/cpu\
- components/datetime\
- components/disk\
-+ components/dyn_battery\
- components/entropy\
- components/hostname\
- components/ip\
-diff --git a/components/dyn_battery.c b/components/dyn_battery.c
-new file mode 100644
-index 0000000..cc87fc1
---- /dev/null
-+++ b/components/dyn_battery.c
-@@ -0,0 +1,124 @@
-+/* Written by Lukas Lynch <madi@mxdi.xyz> */
-+/* Only Linux is supported */
-+#include <stdio.h>
-+#include <stdlib.h>
-+#include <stdbool.h>
-+#include <string.h>
-+#include <dirent.h>
-+
-+#include "../util.h"
-+#include "../slstatus.h"
-+
-+#define BAT_PREFIX "BAT"
-+#define BAT_DIR "/sys/class/power_supply"
-+
-+static bool err;
-+static const char *err_str = "err";
-+
-+/**
-+* Calculates the number of digits in a given positive integer.
-+*/
-+static size_t
-+count_digits(const unsigned int input) {
-+ size_t count = 0;
-+ unsigned int n = input;
-+
-+ while(n/10 != 0)
-+ count++;
-+
-+ return count+1;
-+}
-+
-+/**
-+* Counts number of batteries detected by system.
-+*
-+* @return Unsigned integer denoting the number of detected batteries
-+* @author Lukas Lynch
-+*/
-+static unsigned int
-+count_batteries(void) {
-+ const size_t bat_prefix_s = strlen(BAT_PREFIX);
-+ DIR *dir = opendir(BAT_DIR);
-+ if(!dir) {
-+ fprintf(stderr, "dyn_battery: Failed to open %s\n", BAT_DIR);
-+ err = true;
-+ return 0;
-+ }
-+
-+ unsigned int batc = 0;
-+ struct dirent *entry;
-+ while((entry = readdir(dir)))
-+ if(
-+ strlen(entry->d_name) > bat_prefix_s &&
-+ strncmp(entry->d_name, BAT_PREFIX, bat_prefix_s) == 0
-+ ) batc++;
-+
-+ (void) closedir(dir);
-+ return batc;
-+}
-+
-+/**
-+* Displays the status and capacity of a dynamic amount of batteries (i.e.
-+* laptops may have secondary external batteries).
-+*
-+* @param fmt format string to use for each battery display. ordered key:
-+* %u: battery number || %s: battery state || %s battery capacity
-+* @return string containing the status and capacities of all detected batteries
-+* @author Lukas Lynch
-+*/
-+const char *
-+dyn_battery(const char *fmt) {
-+ err = false;
-+ const size_t fmt_s = strlen(fmt);
-+ const unsigned int batc = count_batteries();
-+
-+ if(err) // err set by count_batteries()
-+ return err_str;
-+
-+ if(batc == 0)
-+ return NULL;
-+
-+ // We need the amount of digits in bat_c for displaying it in strings
-+ const size_t batc_digits = count_digits(batc);
-+
-+ char buf[
-+ (batc * (fmt_s - 2)) // bat count * (format string - "%u" format specifier)
-+ + (batc * batc_digits) // bat count * digits in bat count
-+ + 1 // NULL byte
-+ ];
-+
-+ // Fill buffer with 0s, otherwise displacement calculations below can fail
-+ memset(buf, 0, sizeof(buf));
-+
-+ /*
-+ * The displacement variable will be updated with the current string length,
-+ * which is independent from the buffer size, in order to allow us to write
-+ * to the buffer without overwriting.
-+ */
-+ unsigned int displacement = 0;
-+ for(unsigned int i=0; i<batc; i++) {
-+ // Length of BAT_PREFIX + number of digits in bat count + 1 (NULL byte)
-+ char bat[strlen(BAT_PREFIX) + batc_digits + 1];
-+ (void) sprintf(bat, "%s%u", BAT_PREFIX, i);
-+
-+ // Add battery info to output buffer
-+ displacement += sprintf(
-+ buf + displacement, // Write into buffer after previous writes
-+ fmt, // Format string specified by config.h
-+ i,
-+ battery_state(bat), // See components/battery.c
-+ battery_perc(bat) // See components/battery.c
-+ );
-+
-+ // Add space between battery entries
-+ buf[displacement++] = ' ';
-+ }
-+
-+ // Remove extra space after last battery entry
-+ buf[--displacement] = '\0';
-+
-+ return bprintf("%s", buf);
-+}
-+
-+#undef BAT_DIR
-+#undef BAT_PREFIX
-\ No newline at end of file
-diff --git a/config.def.h b/config.def.h
-index 100093e..7f26909 100644
---- a/config.def.h
-+++ b/config.def.h
-@@ -26,6 +26,7 @@ static const char unknown_str[] = "n/a";
- * disk_perc disk usage in percent mountpoint path (/)
- * disk_total total disk space in GB mountpoint path (/)
- * disk_used used disk space in GB mountpoint path (/)
-+ * dyn_battery displays the name, state and format string (%u, %s, %s)
- * entropy available entropy NULL
- * gid GID of current user NULL
- * hostname hostname NULL
-diff --git a/slstatus.h b/slstatus.h
-index 394281c..6beeaec 100644
---- a/slstatus.h
-+++ b/slstatus.h
-@@ -21,6 +21,9 @@ const char *disk_perc(const char *path);
- const char *disk_total(const char *path);
- const char *disk_used(const char *path);
-
-+/* dyn_battery */
-+const char *dyn_battery(const char *fmt);
-+
- /* entropy */
- const char *entropy(const char *unused);
-
---
-2.52.0
-
DIR diff --git a/tools.suckless.org/slstatus/patches/dyn-battery/slstatus-dyn_battery-20260218-614c275.diff b/tools.suckless.org/slstatus/patches/dyn-battery/slstatus-dyn_battery-20260218-614c275.diff
@@ -0,0 +1,141 @@
+From 5f04140fe8c73a96bae2a4eba899f2b114849673 Mon Sep 17 00:00:00 2001
+From: Lukas Lynch <madi@mxdi.xyz>
+Date: Wed, 18 Feb 2026 16:20:25 -0800
+Subject: [PATCH] Displays status/capacity for a dynamic # of batteries
+
+---
+ Makefile | 1 +
+ components/dyn_battery.c | 80 ++++++++++++++++++++++++++++++++++++++++
+ config.def.h | 1 +
+ slstatus.h | 3 ++
+ 4 files changed, 85 insertions(+)
+ create mode 100644 components/dyn_battery.c
+
+diff --git a/Makefile b/Makefile
+index 7a18274..d1b24dd 100644
+--- a/Makefile
++++ b/Makefile
+@@ -11,6 +11,7 @@ COM =\
+ components/cpu\
+ components/datetime\
+ components/disk\
++ components/dyn_battery\
+ components/entropy\
+ components/hostname\
+ components/ip\
+diff --git a/components/dyn_battery.c b/components/dyn_battery.c
+new file mode 100644
+index 0000000..7f49122
+--- /dev/null
++++ b/components/dyn_battery.c
+@@ -0,0 +1,80 @@
++/* Written by Lukas Lynch <madi@mxdi.xyz> */
++/* Only Linux is supported */
++#include <stdio.h>
++#include <string.h>
++#include <dirent.h>
++
++/* extern char buf[n] */
++#include "../util.h"
++
++/* See components/battery.c */
++const char *battery_state(const char *);
++const char *battery_perc(const char *);
++
++/*
++* This output buffer is global so we can just return its address, instead of
++* copying its contents to 'buf' (declared in slstatus.c) with bprintf().
++*/
++char out[sizeof(buf)];
++
++#if defined(__linux__)
++#define BAT_PREFIX "BAT"
++#define BAT_PREFIX_LEN sizeof(BAT_PREFIX)-1 // NULL byte included in sizeof()
++#define BAT_DIR "/sys/class/power_supply/"
++
++/**
++* Displays the status and capacity of a dynamic amount of batteries (i.e.
++* laptops with external/secondary batteries).
++*
++* @param fmt format string to use for each battery display. ordered key:
++* %u: battery number || %s: battery state || %s battery capacity
++* @return address of the output buffer, which contains the status and
++* capacities of all detected batteries
++*/
++const char *
++dyn_battery(const char *fmt) {
++ *out = '\0'; // Functionally "clears" the buffer after last run
++
++ DIR *dirp = opendir(BAT_DIR);
++ if(!dirp) {
++ fprintf(stderr, "dyn_battery: Failed to open %s\n", BAT_DIR);
++ return "err";
++ }
++
++ unsigned int outp = 0, // Next free position in 'out'
++ batn = 0; // Battery # (i.e. BAT0, BAT1, ...)
++ struct dirent *fp; // Current file in 'dirp' readout
++
++ while((fp = readdir(dirp))) {
++ char *bat = fp->d_name; // Makes following code less ugly
++
++ if(
++ strlen(bat) > BAT_PREFIX_LEN &&
++ strncmp(bat, BAT_PREFIX, BAT_PREFIX_LEN) == 0
++ ) {
++ outp += sprintf(
++ out + outp, // Starts after previous writes
++ fmt, // Format string specified in config.h
++ batn++, // 'batn' is decoupled from OS BAT#
++ battery_state(bat), // See components/battery.c
++ battery_perc(bat) // See components/battery.c
++ );
++
++ // Add space between battery entries
++ buf[outp++] = ' ';
++ }
++ } // end while
++
++ if(closedir(dirp) != 0) {
++ fprintf(stderr, "dyn_battery: Failed to close %s.\n", BAT_DIR);
++ return "err";
++ }
++
++ if(*out) {
++ out[--outp] = '\0'; // Remove extra space after last write
++ return out;
++ } else return NULL;
++}
++#else // #if defined(__linux__)
++# error "dyn_battery: Only Linux is currently supported."
++#endif
+\ No newline at end of file
+diff --git a/config.def.h b/config.def.h
+index 100093e..7f26909 100644
+--- a/config.def.h
++++ b/config.def.h
+@@ -26,6 +26,7 @@ static const char unknown_str[] = "n/a";
+ * disk_perc disk usage in percent mountpoint path (/)
+ * disk_total total disk space in GB mountpoint path (/)
+ * disk_used used disk space in GB mountpoint path (/)
++ * dyn_battery displays the name, state and format string (%u, %s, %s)
+ * entropy available entropy NULL
+ * gid GID of current user NULL
+ * hostname hostname NULL
+diff --git a/slstatus.h b/slstatus.h
+index 394281c..6beeaec 100644
+--- a/slstatus.h
++++ b/slstatus.h
+@@ -21,6 +21,9 @@ const char *disk_perc(const char *path);
+ const char *disk_total(const char *path);
+ const char *disk_used(const char *path);
+
++/* dyn_battery */
++const char *dyn_battery(const char *fmt);
++
+ /* entropy */
+ const char *entropy(const char *unused);
+
+--
+2.53.0
+