Add link to FreeBSD implementation

This function will be called from all architectures

README.md

@@ -25,6 +25,11 @@ On debian-based systems, the following line will install all requirements:
 apt-get install autoconf libconfuse-dev libyajl-dev libasound2-dev libiw-dev asciidoc libpulse-dev libnl-genl-3-dev meson
 ```
 
+On OpenBSD, the following line will install some of the requirements:
+```bash
+pkg_add autoconf libconfuse libyajl asciidoc pluseaudio meson
+```
+
 ## Upstream
 
 i3status is developed at https://github.com/i3/i3status

src/print_cpu_usage.c

@@ -45,14 +45,12 @@ struct cpu_usage {
     long system;
     long idle;
     long total;
+    int spin;
 #else
     int user;
     int nice;
     int system;
     int idle;
-#if defined(__OpenBSD__)
-    int spin;
-#endif
     int total;
 #endif
 };

src/print_mem.c

@@ -5,6 +5,8 @@
 #include <stdlib.h>
 #include <yajl/yajl_gen.h>
 #include <yajl/yajl_version.h>
+#include <sys/param.h>
+#include <sys/sysctl.h>
 #include "i3status.h"
 
 #define MAX_DECIMALS 4
@@ -12,12 +14,20 @@
 
 #define BINARY_BASE 1024UL
 
-#if defined(__linux__)
 static const char *const iec_symbols[] = {"B", "KiB", "MiB", "GiB", "TiB"};
 #define MAX_EXPONENT ((sizeof iec_symbols / sizeof *iec_symbols) - 1)
-#endif
 
-#if defined(__linux__)
+struct print_mem_info {
+    unsigned long ram_total;
+    unsigned long ram_free;
+    unsigned long ram_used;
+    unsigned long ram_available;
+    unsigned long ram_buffers;
+    unsigned long ram_cached;
+    unsigned long ram_shared;
+    char *output_color;
+};
+
 /*
  * Prints the given amount of bytes in a human readable manner.
  *
@@ -40,9 +50,11 @@ static int print_bytes_human(char *outwalk, unsigned long bytes, const char *uni
 static int print_percentage(char *outwalk, float percent) {
     return snprintf(outwalk, STRING_SIZE, "%.1f%s", percent, pct_mark);
 }
-#endif
 
-#if defined(__linux__)
+static unsigned long page2byte (unsigned pageCnt) {
+    return pageCnt * getpagesize ();
+}
+
 /*
  * Convert a string to its absolute representation based on the total
  * memory of `mem_total`.
@@ -84,22 +96,39 @@ static unsigned long memory_absolute(const char *mem_amount, const unsigned long
 
     return amount;
 }
-#endif
 
-void print_memory(memory_ctx_t *ctx) {
+static void handle_used_method(struct print_mem_info *minfo, memory_ctx_t *ctx) {
+    if (BEGINS_WITH(ctx->memory_used_method, "memavailable")) {
+        minfo->ram_used = minfo->ram_total - minfo->ram_available;
+    } else if (BEGINS_WITH(ctx->memory_used_method, "classical")) {
+        minfo->ram_used = minfo->ram_total - minfo->ram_free - minfo->ram_buffers - minfo->ram_cached;
+    } else {
+        die("Unexpected value: memory_used_method = %s", ctx->memory_used_method);
+    }
+}
+
+static void handle_threshold(struct print_mem_info *minfo, memory_ctx_t *ctx) {
+    if (ctx->threshold_degraded) {
+        const unsigned long threshold = memory_absolute(ctx->threshold_degraded, minfo->ram_total);
+        if (minfo->ram_available < threshold) {
+            minfo->output_color = "color_degraded";
+        }
+    }
+
+    if (ctx->threshold_critical) {
+        const unsigned long threshold = memory_absolute(ctx->threshold_critical, minfo->ram_total);
+        if (minfo->ram_available < threshold) {
+            minfo->output_color = "color_bad";
+        }
+    }
+}
+
+static void get_memory_info(struct print_mem_info *minfo, memory_ctx_t *ctx) {
     char *outwalk = ctx->buf;
-
 #if defined(__linux__)
-    const char *selected_format = ctx->format;
-    const char *output_color = NULL;
-
     int unread_fields = 6;
-    unsigned long ram_total;
-    unsigned long ram_free;
-    unsigned long ram_available;
-    unsigned long ram_buffers;
-    unsigned long ram_cached;
-    unsigned long ram_shared;
+
+    minfo->output_color = NULL
 
     FILE *file = fopen("/proc/meminfo", "r");
     if (!file) {
@@ -107,17 +136,17 @@ void print_memory(memory_ctx_t *ctx) {
     }
     for (char line[128]; fgets(line, sizeof line, file);) {
         if (BEGINS_WITH(line, "MemTotal:")) {
-            ram_total = strtoul(line + strlen("MemTotal:"), NULL, 10);
+            minfo->ram_total = strtoul(line + strlen("MemTotal:"), NULL, 10);
         } else if (BEGINS_WITH(line, "MemFree:")) {
-            ram_free = strtoul(line + strlen("MemFree:"), NULL, 10);
+            minfo->ram_free = strtoul(line + strlen("MemFree:"), NULL, 10);
         } else if (BEGINS_WITH(line, "MemAvailable:")) {
-            ram_available = strtoul(line + strlen("MemAvailable:"), NULL, 10);
+            minfo->ram_available = strtoul(line + strlen("MemAvailable:"), NULL, 10);
         } else if (BEGINS_WITH(line, "Buffers:")) {
-            ram_buffers = strtoul(line + strlen("Buffers:"), NULL, 10);
+            minfo->ram_buffers = strtoul(line + strlen("Buffers:"), NULL, 10);
         } else if (BEGINS_WITH(line, "Cached:")) {
-            ram_cached = strtoul(line + strlen("Cached:"), NULL, 10);
+            minfo->ram_cached = strtoul(line + strlen("Cached:"), NULL, 10);
         } else if (BEGINS_WITH(line, "Shmem:")) {
-            ram_shared = strtoul(line + strlen("Shmem:"), NULL, 10);
+            minfo->ram_shared = strtoul(line + strlen("Shmem:"), NULL, 10);
         } else {
             continue;
         }
@@ -132,43 +161,51 @@ void print_memory(memory_ctx_t *ctx) {
     }
 
     // Values are in kB, convert them to B.
-    ram_total *= 1024UL;
-    ram_free *= 1024UL;
-    ram_available *= 1024UL;
-    ram_buffers *= 1024UL;
-    ram_cached *= 1024UL;
-    ram_shared *= 1024UL;
+    minfo->ram_total *= 1024UL;
+    minfo->ram_free *= 1024UL;
+    minfo->ram_available *= 1024UL;
+    minfo->ram_buffers *= 1024UL;
+    minfo->ram_cached *= 1024UL;
+    minfo->ram_shared *= 1024UL;
 
-    unsigned long ram_used;
-    if (BEGINS_WITH(ctx->memory_used_method, "memavailable")) {
-        ram_used = ram_total - ram_available;
-    } else if (BEGINS_WITH(ctx->memory_used_method, "classical")) {
-        ram_used = ram_total - ram_free - ram_buffers - ram_cached;
-    } else {
-        die("Unexpected value: memory_used_method = %s", ctx->memory_used_method);
+    handle_used_method(minfo, ctx);
+    handle_threshold(minfo, ctx);
+error:
+    OUTPUT_FULL_TEXT("can't read memory");
+    fputs("i3status: Cannot read system memory using /proc/meminfo\n", stderr);
+
+#elif defined(__OpenBSD__)
+    int mib [] = { CTL_VM, VM_UVMEXP };
+    struct uvmexp our_uvmexp;
+    size_t size = sizeof (our_uvmexp);
+
+    if (sysctl (mib, 2, &our_uvmexp, &size, NULL, 0) < 0) {
+        OUTPUT_FULL_TEXT("");
+        fputs("i3status: cannot get memory info!\n", stderr);
+        return;
     }
 
-    if (ctx->threshold_degraded) {
-        const unsigned long threshold = memory_absolute(ctx->threshold_degraded, ram_total);
-        if (ram_available < threshold) {
-            output_color = "color_degraded";
-        }
-    }
+    minfo->ram_total = page2byte(our_uvmexp.npages);
+    minfo->ram_free  = page2byte(our_uvmexp.free + our_uvmexp.inactive);
+    minfo->ram_used  = page2byte(our_uvmexp.npages - our_uvmexp.free - our_uvmexp.inactive);
+    minfo->ram_available = minfo->ram_free;
+    minfo->ram_buffers = 0;
+    minfo->ram_cached = 0;
+    minfo->ram_shared = 0;
+    minfo->output_color = NULL;
 
-    if (ctx->threshold_critical) {
-        const unsigned long threshold = memory_absolute(ctx->threshold_critical, ram_total);
-        if (ram_available < threshold) {
-            output_color = "color_bad";
-        }
-    }
-
-    if (output_color) {
-        START_COLOR(output_color);
-
-        if (ctx->format_degraded)
-            selected_format = ctx->format_degraded;
-    }
+    handle_used_method(minfo, ctx);
+    handle_threshold(minfo, ctx);
+#else
+    // For FreeBSD implementation see: https://bal0n.es/git/slstatus/file/components/ram.c.html
+    OUTPUT_FULL_TEXT("");
+    fputs("i3status: Memory status information is not supported on this system\n", stderr);
+#endif
+}
 
+static void print_formatted_memory(struct print_mem_info *minfo, memory_ctx_t *ctx) {
+    char *outwalk = ctx->buf;
+    const char *selected_format = ctx->format;
     char string_ram_total[STRING_SIZE];
     char string_ram_used[STRING_SIZE];
     char string_ram_free[STRING_SIZE];
@@ -179,15 +216,22 @@ void print_memory(memory_ctx_t *ctx) {
     char string_percentage_used[STRING_SIZE];
     char string_percentage_shared[STRING_SIZE];
 
-    print_bytes_human(string_ram_total, ram_total, ctx->unit, ctx->decimals);
-    print_bytes_human(string_ram_used, ram_used, ctx->unit, ctx->decimals);
-    print_bytes_human(string_ram_free, ram_free, ctx->unit, ctx->decimals);
-    print_bytes_human(string_ram_available, ram_available, ctx->unit, ctx->decimals);
-    print_bytes_human(string_ram_shared, ram_shared, ctx->unit, ctx->decimals);
-    print_percentage(string_percentage_free, 100.0 * ram_free / ram_total);
-    print_percentage(string_percentage_available, 100.0 * ram_available / ram_total);
-    print_percentage(string_percentage_used, 100.0 * ram_used / ram_total);
-    print_percentage(string_percentage_shared, 100.0 * ram_shared / ram_total);
+    if (minfo->output_color) {
+        START_COLOR(minfo->output_color);
+
+        if (ctx->format_degraded)
+            selected_format = ctx->format_degraded;
+    }
+
+    print_bytes_human(string_ram_total, minfo->ram_total, ctx->unit, ctx->decimals);
+    print_bytes_human(string_ram_used, minfo->ram_used, ctx->unit, ctx->decimals);
+    print_bytes_human(string_ram_free, minfo->ram_free, ctx->unit, ctx->decimals);
+    print_bytes_human(string_ram_available, minfo->ram_available, ctx->unit, ctx->decimals);
+    print_bytes_human(string_ram_shared, minfo->ram_shared, ctx->unit, ctx->decimals);
+    print_percentage(string_percentage_free, 100.0 * minfo->ram_free / minfo->ram_total);
+    print_percentage(string_percentage_available, 100.0 * minfo->ram_available / minfo->ram_total);
+    print_percentage(string_percentage_used, 100.0 * minfo->ram_used / minfo->ram_total);
+    print_percentage(string_percentage_shared, 100.0 * minfo->ram_shared / minfo->ram_total);
 
     placeholder_t placeholders[] = {
         {.name = "%total", .value = string_ram_total},
@@ -205,17 +249,15 @@ void print_memory(memory_ctx_t *ctx) {
     OUTPUT_FORMATTED;
     free(formatted);
 
-    if (output_color)
+    if (minfo->output_color)
         END_COLOR;
 
     OUTPUT_FULL_TEXT(ctx->buf);
-
-    return;
-error:
-    OUTPUT_FULL_TEXT("can't read memory");
-    fputs("i3status: Cannot read system memory using /proc/meminfo\n", stderr);
-#else
-    OUTPUT_FULL_TEXT("");
-    fputs("i3status: Memory status information is not supported on this system\n", stderr);
-#endif
+}
+
+void print_memory(memory_ctx_t *ctx) {
+    struct print_mem_info minfo;
+
+    get_memory_info(&minfo, ctx);
+    print_formatted_memory(&minfo, ctx);
 }