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// vim:ts=8:expandtab
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <mntent.h>
#include <stdint.h>
#include <sys/stat.h>
#include <sys/statvfs.h>
#include <sys/types.h>
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || (__OpenBSD__) || defined(__DragonFly__)
#include <sys/param.h>
#include <sys/mount.h>
#endif
#include <yajl/yajl_gen.h>
#include <yajl/yajl_version.h>
#include "i3status.h"
#define BINARY_BASE UINT64_C(1024)
#define DECIMAL_BASE UINT64_C(1000)
#define MAX_EXPONENT 4
static const char * const iec_symbols[MAX_EXPONENT+1] = {"", "Ki", "Mi", "Gi", "Ti"};
static const char * const si_symbols[MAX_EXPONENT+1] = {"", "k", "M", "G", "T"};
static const char * const custom_symbols[MAX_EXPONENT+1] = {"", "K", "M", "G", "T"};
/*
* Formats bytes according to the given base and set of symbols.
*
*/
static int format_bytes(char *outwalk, uint64_t bytes, uint64_t base, const char * const symbols[]) {
double size = bytes;
int exponent = 0;
while (size >= base && exponent < MAX_EXPONENT) {
size /= base;
exponent += 1;
}
return sprintf(outwalk, "%.1f %sB", size, symbols[exponent]);
}
/*
* Prints the given amount of bytes in a human readable manner.
*
*/
static int print_bytes_human(char *outwalk, uint64_t bytes, const char *prefix_type) {
if (strcasecmp(prefix_type, "decimal") == 0) {
return format_bytes(outwalk, bytes, DECIMAL_BASE, si_symbols);
} else if (strcasecmp(prefix_type, "custom") == 0) {
return format_bytes(outwalk, bytes, BINARY_BASE, custom_symbols);
} else {
return format_bytes(outwalk, bytes, BINARY_BASE, iec_symbols);
}
}
/*
* Determines whether remaining bytes are below given threshold.
*
*/
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__) || defined(__DragonFly__)
static bool below_threshold(struct statfs buf, const char *prefix_type, const char *threshold_type, const double low_threshold) {
#else
static bool below_threshold(struct statvfs buf, const char *prefix_type, const char *threshold_type, const double low_threshold) {
#endif
if (strcasecmp(threshold_type, "percentage_free") == 0) {
return 100.0 * (double)buf.f_bfree / (double)buf.f_blocks < low_threshold;
} else if (strcasecmp(threshold_type, "percentage_avail") == 0) {
return 100.0 * (double)buf.f_bavail / (double)buf.f_blocks < low_threshold;
} else if (strcasecmp(threshold_type, "bytes_free") == 0) {
return (double)buf.f_bsize * (double)buf.f_bfree < low_threshold;
} else if (strcasecmp(threshold_type, "bytes_avail") == 0) {
return (double)buf.f_bsize * (double)buf.f_bavail < low_threshold;
} else if (threshold_type[0] != '\0' && strncasecmp(threshold_type+1, "bytes_", strlen("bytes_")) == 0) {
uint64_t base = strcasecmp(prefix_type, "decimal") == 0 ? DECIMAL_BASE : BINARY_BASE;
double factor = 1;
switch (threshold_type[0]) {
case 'T':
case 't':
factor *= base;
case 'G':
case 'g':
factor *= base;
case 'M':
case 'm':
factor *= base;
case 'K':
case 'k':
factor *= base;
break;
default:
return false;
}
if (strcasecmp(threshold_type+1, "bytes_free") == 0) {
return (double)buf.f_bsize * (double)buf.f_bfree < low_threshold * factor;
} else if (strcasecmp(threshold_type+1, "bytes_avail") == 0) {
return (double)buf.f_bsize * (double)buf.f_bavail < low_threshold * factor;
}
}
return false;
}
/*
* Does a statvfs and prints either free, used or total amounts of bytes in a
* human readable manner.
*
*/
void print_disk_info(yajl_gen json_gen, char *buffer, const char *path, const char *format, const char *prefix_type, const char *threshold_type, const double low_threshold) {
const char *walk;
char *outwalk = buffer;
bool colorful_output = false;
INSTANCE(path);
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__) || defined(__DragonFly__)
struct statfs buf;
if (statfs(path, &buf) == -1)
return;
#else
struct statvfs buf;
if (statvfs(path, &buf) == -1)
return;
#endif
FILE *mntentfile = setmntent("/etc/mtab", "r");
struct mntent *m;
bool found = false;
while ((m = getmntent(mntentfile))) {
if (strcmp(m->mnt_dir, path) == 0) {
found = true;
break;
}
}
endmntent(mntentfile);
if(!found) {
*outwalk = '\0';
OUTPUT_FULL_TEXT(buffer);
return;
}
if (low_threshold > 0 && below_threshold(buf, prefix_type, threshold_type, low_threshold)) {
START_COLOR("color_bad");
colorful_output = true;
}
for (walk = format; *walk != '\0'; walk++) {
if (*walk != '%') {
*(outwalk++) = *walk;
continue;
}
if (BEGINS_WITH(walk+1, "free")) {
outwalk += print_bytes_human(outwalk, (uint64_t)buf.f_bsize * (uint64_t)buf.f_bfree, prefix_type);
walk += strlen("free");
}
if (BEGINS_WITH(walk+1, "used")) {
outwalk += print_bytes_human(outwalk, (uint64_t)buf.f_bsize * ((uint64_t)buf.f_blocks - (uint64_t)buf.f_bfree), prefix_type);
walk += strlen("used");
}
if (BEGINS_WITH(walk+1, "total")) {
outwalk += print_bytes_human(outwalk, (uint64_t)buf.f_bsize * (uint64_t)buf.f_blocks, prefix_type);
walk += strlen("total");
}
if (BEGINS_WITH(walk+1, "avail")) {
outwalk += print_bytes_human(outwalk, (uint64_t)buf.f_bsize * (uint64_t)buf.f_bavail, prefix_type);
walk += strlen("avail");
}
if (BEGINS_WITH(walk+1, "percentage_free")) {
outwalk += sprintf(outwalk, "%.01f%%", 100.0 * (double)buf.f_bfree / (double)buf.f_blocks);
walk += strlen("percentage_free");
}
if (BEGINS_WITH(walk+1, "percentage_used_of_avail")) {
outwalk += sprintf(outwalk, "%.01f%%", 100.0 * (double)(buf.f_blocks - buf.f_bavail) / (double)buf.f_blocks);
walk += strlen("percentage_used_of_avail");
}
if (BEGINS_WITH(walk+1, "percentage_used")) {
outwalk += sprintf(outwalk, "%.01f%%", 100.0 * (double)(buf.f_blocks - buf.f_bfree) / (double)buf.f_blocks);
walk += strlen("percentage_used");
}
if (BEGINS_WITH(walk+1, "percentage_avail")) {
outwalk += sprintf(outwalk, "%.01f%%", 100.0 * (double)buf.f_bavail / (double)buf.f_blocks);
walk += strlen("percentage_avail");
}
}
if (colorful_output)
END_COLOR;
*outwalk = '\0';
OUTPUT_FULL_TEXT(buffer);
}
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