[slstatus][patch][dyn-battery]Improved memory-safety - sites - public wiki contents of suckless.org
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---
(DIR) commit 2f7366e8fd55260291bd91c3d87b63e927a797ee
(DIR) parent a204929ae6f4bec1603b1f1cb4006f0984bff11c
(HTM) Author: Madison Lynch <madi@mxdi.xyz>
Date: Wed, 16 Apr 2025 16:22:50 -0700
[slstatus][patch][dyn-battery]Improved memory-safety
Diffstat:
M tools.suckless.org/slstatus/patche… | 2 +-
D tools.suckless.org/slstatus/patche… | 141 -------------------------------
A tools.suckless.org/slstatus/patche… | 146 +++++++++++++++++++++++++++++++
3 files changed, 147 insertions(+), 142 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-20250414-f68f492.diff](slstatus-dyn_battery-20250414-f68f492.diff)
+* [slstatus-dyn_battery-20250416-f68f492.diff](slstatus-dyn_battery-20250416-f68f492.diff)
Author
------
(DIR) diff --git a/tools.suckless.org/slstatus/patches/dyn-battery/slstatus-dyn_battery-20250414-f68f492.diff b/tools.suckless.org/slstatus/patches/dyn-battery/slstatus-dyn_battery-20250414-f68f492.diff
@@ -1,141 +0,0 @@
-From b96a72c277a72c77feaf94fac679f3ea87f78ea6 Mon Sep 17 00:00:00 2001
-From: Madison Lynch <madi@mxdi.xyz>
-Date: Mon, 14 Apr 2025 21:04:23 -0700
-Subject: [PATCH] Created dyn-battery patch, for displaying status of multiple
- batteries
-
----
- Makefile | 1 +
- components/dyn_battery.c | 77 ++++++++++++++++++++++++++++++++++++++++
- config.def.h | 4 +++
- 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..2e58351
---- /dev/null
-+++ b/components/dyn_battery.c
-@@ -0,0 +1,77 @@
-+/* Written by Madison Lynch <madi@mxdi.xyz> */
-+/* Only Linux is supported */
-+#include <stdio.h>
-+#include <stdlib.h>
-+#include <string.h>
-+#include <dirent.h>
-+
-+#include "../slstatus.h"
-+
-+#define BAT_PREFIX "BAT"
-+#define BAT_DIR "/sys/class/power_supply"
-+
-+/**
-+* Counts number of batteries detected by system.
-+*
-+* @return unsigned integer denoting the number of detected batteries.
-+* @author Madison Lynch
-+*/
-+static unsigned int
-+battery_count(void) {
-+ DIR *dir = opendir(BAT_DIR);
-+ unsigned int bat_c = 0;
-+
-+ struct dirent *entry;
-+ while((entry = readdir(dir)))
-+ if(strlen(entry->d_name) > 3)
-+ if(strncmp(entry->d_name, BAT_PREFIX, 3) == 0)
-+ bat_c++;
-+
-+ (void) closedir(dir);
-+ return bat_c;
-+}
-+
-+/**
-+* Displays the status and capacity of a dynamic amount of batteries (i.e.
-+* laptop may have secondary external battery).
-+*
-+* @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 Madison Lynch
-+*/
-+const char *
-+dyn_battery(const char *fmt) {
-+ const size_t fmt_s = strlen(fmt);
-+ const unsigned int bat_c = battery_count();
-+
-+ // Extra byte in calloc() for null byte
-+ char *output = (char *)calloc(fmt_s * bat_c + 1, sizeof(char));
-+ unsigned int displacement = 0; // For appending battery displays
-+ for(unsigned int i=0; i<bat_c; i++) {
-+ char bat[7]; // "BAT" = 3 + <=3 digit number + null byte
-+ sprintf(bat, "BAT%u", i);
-+
-+ // Add battery display to final string to be returned
-+ sprintf(
-+ output + displacement,
-+ fmt,
-+ i,
-+ battery_state(bat),
-+ battery_perc(bat)
-+ );
-+ displacement = strlen(output);
-+
-+ // Add space between battery displays
-+ *(output + displacement) = ' ';
-+ displacement++;
-+ }
-+
-+ // Remove extra space after last battery display
-+ output[--displacement] = 0x00;
-+
-+ return output;
-+}
-+
-+#undef BAT_DIR
-+#undef BAT_PREFIX
-diff --git a/config.def.h b/config.def.h
-index d805331..967d63d 100644
---- a/config.def.h
-+++ b/config.def.h
-@@ -26,6 +26,10 @@ 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,
-+ * capacity of all detected %s). order is important,
-+ * batteries and matches description.
-+ * (Linux only)
- * entropy available entropy NULL
- * gid GID of current user NULL
- * hostname hostname NULL
-diff --git a/slstatus.h b/slstatus.h
-index 8ef5874..44a4b61 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);
-
---
-2.49.0
-
(DIR) diff --git a/tools.suckless.org/slstatus/patches/dyn-battery/slstatus-dyn_battery-20250416-f68f492.diff b/tools.suckless.org/slstatus/patches/dyn-battery/slstatus-dyn_battery-20250416-f68f492.diff
@@ -0,0 +1,146 @@
+From 44fcd213f975ae35fb92de9bc56d8d895478edb5 Mon Sep 17 00:00:00 2001
+From: Madison Lynch <madi@mxdi.xyz>
+Date: Wed, 16 Apr 2025 16:18:33 -0700
+Subject: [PATCH] Improved memory-safety in dyn_battery function
+
+---
+ Makefile | 1 +
+ components/dyn_battery.c | 84 ++++++++++++++++++++++++++++++++++++++++
+ config.def.h | 3 ++
+ slstatus.h | 3 ++
+ 4 files changed, 91 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..9377071
+--- /dev/null
++++ b/components/dyn_battery.c
+@@ -0,0 +1,84 @@
++/* Written by Madison Lynch <madi@mxdi.xyz> */
++/* Only Linux is supported */
++#include <stdio.h>
++#include <stdlib.h>
++#include <string.h>
++#include <dirent.h>
++
++#include "../slstatus.h"
++
++#define BAT_PREFIX "BAT"
++#define BAT_DIR "/sys/class/power_supply"
++
++/**
++* Counts number of batteries detected by system.
++*
++* @return unsigned integer denoting the number of detected batteries.
++* @author Madison Lynch
++*/
++static unsigned int
++battery_count(void) {
++ DIR *dir = opendir(BAT_DIR);
++ unsigned int bat_c = 0;
++
++ struct dirent *entry;
++ while((entry = readdir(dir)))
++ if(strlen(entry->d_name) > 3)
++ if(strncmp(entry->d_name, BAT_PREFIX, 3) == 0)
++ bat_c++;
++
++ (void) closedir(dir);
++ return bat_c;
++}
++
++/**
++* Displays the status and capacity of a dynamic amount of batteries (i.e.
++* laptop may have secondary external battery).
++*
++* @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 Madison Lynch
++*/
++const char *
++dyn_battery(const char *fmt) {
++ static char *ret;
++ free(ret); // Free address from previous output
++
++ const size_t fmt_s = strlen(fmt);
++ const unsigned int bat_c = battery_count();
++
++ // Extra byte in calloc() for null byte
++ ret = (char *)calloc(fmt_s * bat_c + 1, sizeof(char));
++ if(!ret) {
++ fprintf(stderr, "dyn_battery: calloc() failed.");
++ return NULL;
++ }
++
++ unsigned int displacement = 0; // For appending battery displays
++ for(unsigned int i=0; i<bat_c; i++) {
++ char bat[7]; // "BAT" = 3 + <=3 digit number + null byte
++ (void) sprintf(bat, "BAT%u", i);
++
++ // Add battery display to final string to be returned
++ (void) sprintf(
++ ret + displacement,
++ fmt,
++ i,
++ battery_state(bat),
++ battery_perc(bat)
++ );
++ displacement = strlen(ret);
++
++ // Add space between battery displays
++ ret[displacement++] = ' ';
++ }
++
++ // Remove extra space after last battery display
++ ret[--displacement] = '\0';
++
++ return ret;
++}
++
++#undef BAT_DIR
++#undef BAT_PREFIX
+diff --git a/config.def.h b/config.def.h
+index d805331..a0052e3 100644
+--- a/config.def.h
++++ b/config.def.h
+@@ -26,6 +26,9 @@ 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,
++ * capacity of all detected %s). order is important,
++ * batteries and matches description.
+ * entropy available entropy NULL
+ * gid GID of current user NULL
+ * hostname hostname NULL
+diff --git a/slstatus.h b/slstatus.h
+index 8ef5874..44a4b61 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);
+
+--
+2.49.0
+