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// vim:ts=4:sw=4:expandtab
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <yajl/yajl_gen.h>
#include <yajl/yajl_version.h>
#include "i3status.h"
#define BINARY_BASE UINT64_C(1024)
#define MAX_EXPONENT 4
static const char *const iec_symbols[MAX_EXPONENT + 1] = {"", "Ki", "Mi", "Gi", "Ti"};
static const char memoryfile_linux[] = "/proc/meminfo";
/*
* Prints the given amount of bytes in a human readable manner.
*
*/
static int print_bytes_human(char *outwalk, uint64_t bytes) {
double size = bytes;
int exponent = 0;
int bin_base = BINARY_BASE;
while (size >= bin_base && exponent < MAX_EXPONENT) {
size /= bin_base;
exponent += 1;
}
return sprintf(outwalk, "%.1f %sB", size, iec_symbols[exponent]);
}
/*
* Convert a string to its absolute representation based on the total
* memory of `mem_total`.
*
* The string can contain any percentage values, which then return a
* the value of `size` in relation to `mem_total`.
* Alternatively an absolute value can be given, suffixed with an iec
* symbol.
*
*/
static long memory_absolute(const long mem_total, const char *size) {
long mem_absolute = -1;
char *endptr = NULL;
mem_absolute = strtol(size, &endptr, 10);
if (endptr) {
while (endptr[0] != '\0' && isspace(endptr[0]))
endptr++;
switch (endptr[0]) {
case 'T':
case 't':
mem_absolute *= BINARY_BASE;
case 'G':
case 'g':
mem_absolute *= BINARY_BASE;
case 'M':
case 'm':
mem_absolute *= BINARY_BASE;
case 'K':
case 'k':
mem_absolute *= BINARY_BASE;
break;
case '%':
mem_absolute = mem_total * mem_absolute / 100;
break;
default:
break;
}
}
return mem_absolute;
}
void print_memory(yajl_gen json_gen, char *buffer, const char *format, const char *format_degraded, const char *threshold_degraded, const char *threshold_critical, const char *memory_used_method) {
char *outwalk = buffer;
#if defined(linux)
const char *selected_format = format;
const char *walk;
const char *output_color = NULL;
long ram_total = -1;
long ram_free = -1;
long ram_available = -1;
long ram_used = -1;
long ram_shared = -1;
long ram_cached = -1;
long ram_buffers = -1;
FILE *file = fopen(memoryfile_linux, "r");
if (!file) {
goto error;
}
char line[128];
while (fgets(line, sizeof line, file)) {
if (BEGINS_WITH(line, "MemTotal:")) {
ram_total = strtol(line + strlen("MemTotal:"), NULL, 10);
}
if (BEGINS_WITH(line, "MemFree:")) {
ram_free = strtol(line + strlen("MemFree:"), NULL, 10);
}
if (BEGINS_WITH(line, "MemAvailable:")) {
ram_available = strtol(line + strlen("MemAvailable:"), NULL, 10);
}
if (BEGINS_WITH(line, "Buffers:")) {
ram_buffers = strtol(line + strlen("Buffers:"), NULL, 10);
}
if (BEGINS_WITH(line, "Cached:")) {
ram_cached = strtol(line + strlen("Cached:"), NULL, 10);
}
if (BEGINS_WITH(line, "Shmem:")) {
ram_shared = strtol(line + strlen("Shmem:"), NULL, 10);
}
if (ram_total != -1 && ram_free != -1 && ram_available != -1 && ram_buffers != -1 && ram_cached != -1 && ram_shared != -1) {
break;
}
}
fclose(file);
if (ram_total == -1 || ram_free == -1 || ram_available == -1 || ram_buffers == -1 || ram_cached == -1 || ram_shared == -1) {
goto error;
}
ram_total = ram_total * BINARY_BASE;
ram_free = ram_free * BINARY_BASE;
ram_available = ram_available * BINARY_BASE;
ram_buffers = ram_buffers * BINARY_BASE;
ram_cached = ram_cached * BINARY_BASE;
ram_shared = ram_shared * BINARY_BASE;
if (BEGINS_WITH(memory_used_method, "memavailable")) {
ram_used = ram_total - ram_available;
} else if (BEGINS_WITH(memory_used_method, "classical")) {
ram_used = ram_total - ram_free - ram_buffers - ram_cached;
}
if (threshold_degraded) {
long abs = memory_absolute(ram_total, threshold_degraded);
if (ram_available < abs) {
output_color = "color_degraded";
}
}
if (threshold_critical) {
long abs = memory_absolute(ram_total, threshold_critical);
if (ram_available < abs) {
output_color = "color_bad";
}
}
if (output_color) {
START_COLOR(output_color);
if (format_degraded)
selected_format = format_degraded;
}
for (walk = selected_format; *walk != '\0'; walk++) {
if (*walk != '%') {
*(outwalk++) = *walk;
continue;
}
if (BEGINS_WITH(walk + 1, "total")) {
outwalk += print_bytes_human(outwalk, ram_total);
walk += strlen("total");
}
if (BEGINS_WITH(walk + 1, "used")) {
outwalk += print_bytes_human(outwalk, ram_used);
walk += strlen("used");
}
if (BEGINS_WITH(walk + 1, "free")) {
outwalk += print_bytes_human(outwalk, ram_free);
walk += strlen("free");
}
if (BEGINS_WITH(walk + 1, "available")) {
outwalk += print_bytes_human(outwalk, ram_available);
walk += strlen("available");
}
if (BEGINS_WITH(walk + 1, "shared")) {
outwalk += print_bytes_human(outwalk, ram_shared);
walk += strlen("shared");
}
if (BEGINS_WITH(walk + 1, "percentage_free")) {
outwalk += sprintf(outwalk, "%.01f%s", 100.0 * ram_free / ram_total, pct_mark);
walk += strlen("percentage_free");
}
if (BEGINS_WITH(walk + 1, "percentage_available")) {
outwalk += sprintf(outwalk, "%.01f%s", 100.0 * ram_available / ram_total, pct_mark);
walk += strlen("percentage_available");
}
if (BEGINS_WITH(walk + 1, "percentage_used")) {
outwalk += sprintf(outwalk, "%.01f%s", 100.0 * ram_used / ram_total, pct_mark);
walk += strlen("percentage_used");
}
if (BEGINS_WITH(walk + 1, "percentage_shared")) {
outwalk += sprintf(outwalk, "%.01f%s", 100.0 * ram_shared / ram_total, pct_mark);
walk += strlen("percentage_shared");
}
}
if (output_color)
END_COLOR;
*outwalk = '\0';
OUTPUT_FULL_TEXT(buffer);
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
}
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