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// vim:ts=4:sw=4:expandtab
#include <config.h>
#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 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)
/*
* Prints the given amount of bytes in a human readable manner.
*
*/
static int print_bytes_human(char *outwalk, unsigned long bytes, const char *unit, const int decimals) {
double base = bytes;
int exponent = 0;
while (base >= BINARY_BASE && exponent < MAX_EXPONENT) {
if (strcasecmp(unit, iec_symbols[exponent]) == 0) {
break;
}
base /= BINARY_BASE;
exponent += 1;
}
return sprintf(outwalk, "%.*f %s", decimals, base, iec_symbols[exponent]);
}
#endif
#if defined(linux)
/*
* 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 `mem_amount` in relation to `mem_total`.
* Alternatively an absolute value can be given, suffixed with an iec
* symbol.
*
*/
static unsigned long memory_absolute(const char *mem_amount, const unsigned long mem_total) {
char *endptr;
unsigned long amount = strtoul(mem_amount, &endptr, 10);
while (endptr[0] != '\0' && isspace(endptr[0]))
endptr++;
switch (endptr[0]) {
case 'T':
case 't':
amount *= BINARY_BASE;
case 'G':
case 'g':
amount *= BINARY_BASE;
case 'M':
case 'm':
amount *= BINARY_BASE;
case 'K':
case 'k':
amount *= BINARY_BASE;
break;
case '%':
amount = mem_total * amount / 100;
break;
}
return amount;
}
#endif
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, const char *unit, const int decimals) {
char *outwalk = buffer;
#if defined(linux)
const char *selected_format = format;
const char *walk;
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;
FILE *file = fopen("/proc/meminfo", "r");
if (!file) {
goto error;
}
for (char line[128]; fgets(line, sizeof line, file);) {
if (BEGINS_WITH(line, "MemTotal:")) {
ram_total = strtoul(line + strlen("MemTotal:"), NULL, 10);
} else if (BEGINS_WITH(line, "MemFree:")) {
ram_free = strtoul(line + strlen("MemFree:"), NULL, 10);
} else if (BEGINS_WITH(line, "MemAvailable:")) {
ram_available = strtoul(line + strlen("MemAvailable:"), NULL, 10);
} else if (BEGINS_WITH(line, "Buffers:")) {
ram_buffers = strtoul(line + strlen("Buffers:"), NULL, 10);
} else if (BEGINS_WITH(line, "Cached:")) {
ram_cached = strtoul(line + strlen("Cached:"), NULL, 10);
} else if (BEGINS_WITH(line, "Shmem:")) {
ram_shared = strtoul(line + strlen("Shmem:"), NULL, 10);
} else {
continue;
}
if (--unread_fields == 0) {
break;
}
}
fclose(file);
if (unread_fields > 0) {
goto error;
}
// 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;
unsigned long ram_used;
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) {
const unsigned long threshold = memory_absolute(threshold_degraded, ram_total);
if (ram_available < threshold) {
output_color = "color_degraded";
}
}
if (threshold_critical) {
const unsigned long threshold = memory_absolute(threshold_critical, ram_total);
if (ram_available < threshold) {
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;
} else if (BEGINS_WITH(walk + 1, "total")) {
outwalk += print_bytes_human(outwalk, ram_total, unit, decimals);
walk += strlen("total");
} else if (BEGINS_WITH(walk + 1, "used")) {
outwalk += print_bytes_human(outwalk, ram_used, unit, decimals);
walk += strlen("used");
} else if (BEGINS_WITH(walk + 1, "free")) {
outwalk += print_bytes_human(outwalk, ram_free, unit, decimals);
walk += strlen("free");
} else if (BEGINS_WITH(walk + 1, "available")) {
outwalk += print_bytes_human(outwalk, ram_available, unit, decimals);
walk += strlen("available");
} else if (BEGINS_WITH(walk + 1, "shared")) {
outwalk += print_bytes_human(outwalk, ram_shared, unit, decimals);
walk += strlen("shared");
} else if (BEGINS_WITH(walk + 1, "percentage_free")) {
outwalk += sprintf(outwalk, "%.01f%s", 100.0 * ram_free / ram_total, pct_mark);
walk += strlen("percentage_free");
} else if (BEGINS_WITH(walk + 1, "percentage_available")) {
outwalk += sprintf(outwalk, "%.01f%s", 100.0 * ram_available / ram_total, pct_mark);
walk += strlen("percentage_available");
} else if (BEGINS_WITH(walk + 1, "percentage_used")) {
outwalk += sprintf(outwalk, "%.01f%s", 100.0 * ram_used / ram_total, pct_mark);
walk += strlen("percentage_used");
} else if (BEGINS_WITH(walk + 1, "percentage_shared")) {
outwalk += sprintf(outwalk, "%.01f%s", 100.0 * ram_shared / ram_total, pct_mark);
walk += strlen("percentage_shared");
} else {
*(outwalk++) = '%';
}
}
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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