git.sur5r.net Git - i3/i3status/blob - src/print_disk_info.c

   1 // vim:ts=8:expandtab
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include <ctype.h>
   6 #include <stdint.h>
   7 #include <sys/statvfs.h>
   8 #include <sys/types.h>
   9 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || (__OpenBSD__) || defined(__DragonFly__)
  10 #include <sys/param.h>
  11 #include <sys/mount.h>
  12 #endif
  13 #include <yajl/yajl_gen.h>
  14 #include <yajl/yajl_version.h>
  15
  16 #include "i3status.h"
  17
  18 #define BINARY_BASE UINT64_C(1024)
  19 #define DECIMAL_BASE UINT64_C(1000)
  20
  21 #define MAX_EXPONENT 4
  22
  23 static const char * const iec_symbols[MAX_EXPONENT+1] = {"", "Ki", "Mi", "Gi", "Ti"};
  24 static const char * const si_symbols[MAX_EXPONENT+1] = {"", "k", "M", "G", "T"};
  25 static const char * const custom_symbols[MAX_EXPONENT+1] = {"", "K", "M", "G", "T"};
  26
  27 /*
  28  * Formats bytes according to the given base and set of symbols.
  29  *
  30  */
  31 static int format_bytes(char *outwalk, uint64_t bytes, uint64_t base, const char * const symbols[]) {
  32         double size = bytes;
  33         int exponent = 0;
  34         while (size >= base && exponent < MAX_EXPONENT) {
  35                 size /= base;
  36                 exponent += 1;
  37         }
  38         return sprintf(outwalk, "%.1f %sB", size, symbols[exponent]);
  39 }
  40
  41 /*
  42  * Prints the given amount of bytes in a human readable manner.
  43  *
  44  */
  45 static int print_bytes_human(char *outwalk, uint64_t bytes, const char *prefix_type) {
  46         if (strcasecmp(prefix_type, "decimal") == 0) {
  47                 return format_bytes(outwalk, bytes, DECIMAL_BASE, si_symbols);
  48         } else if (strcasecmp(prefix_type, "custom") == 0) {
  49                 return format_bytes(outwalk, bytes, BINARY_BASE, custom_symbols);
  50         } else {
  51                 return format_bytes(outwalk, bytes, BINARY_BASE, iec_symbols);
  52         }
  53 }
  54
  55 /*
  56  * Determines whether remaining bytes are below given threshold.
  57  *
  58  */
  59 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__) || defined(__DragonFly__)
  60 static bool below_threshold(struct statfs buf, const char *prefix_type, const char *threshold_type, const double low_threshold) {
  61 #else
  62 static bool below_threshold(struct statvfs buf, const char *prefix_type, const char *threshold_type, const double low_threshold) {
  63 #endif
  64         if (strcasecmp(threshold_type, "percentage_free") == 0) {
  65                 return 100.0 * (double)buf.f_bfree / (double)buf.f_blocks < low_threshold;
  66         } else if (strcasecmp(threshold_type, "percentage_avail") == 0) {
  67                 return 100.0 * (double)buf.f_bavail / (double)buf.f_blocks < low_threshold;
  68         } else if (strcasecmp(threshold_type, "bytes_free") == 0) {
  69                 return (double)buf.f_bsize * (double)buf.f_bfree < low_threshold;
  70         } else if (strcasecmp(threshold_type, "bytes_avail") == 0) {
  71                 return (double)buf.f_bsize * (double)buf.f_bavail < low_threshold;
  72         } else if (threshold_type[0] != '\0' && strncasecmp(threshold_type+1, "bytes_", strlen("bytes_")) == 0) {
  73                 uint64_t base = strcasecmp(prefix_type, "decimal") == 0 ? DECIMAL_BASE : BINARY_BASE;
  74                 double factor = 1;
  75
  76                 switch (threshold_type[0]) {
  77                 case 'T':
  78                 case 't':
  79                         factor *= base;
  80                 case 'G':
  81                 case 'g':
  82                         factor *= base;
  83                 case 'M':
  84                 case 'm':
  85                         factor *= base;
  86                 case 'K':
  87                 case 'k':
  88                         factor *= base;
  89                         break;
  90                 default:
  91                         return false;
  92                 }
  93
  94                 if (strcasecmp(threshold_type+1, "bytes_free") == 0) {
  95                         return (double)buf.f_bsize * (double)buf.f_bfree < low_threshold * factor;
  96                 } else if (strcasecmp(threshold_type+1, "bytes_avail") == 0) {
  97                         return (double)buf.f_bsize * (double)buf.f_bavail < low_threshold * factor;
  98                 }
  99         }
 100
 101         return false;
 102 }
 103
 104 /*
 105  * Does a statvfs and prints either free, used or total amounts of bytes in a
 106  * human readable manner.
 107  *
 108  */
 109 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) {
 110         const char *walk;
 111         char *outwalk = buffer;
 112         bool colorful_output = false;
 113
 114         INSTANCE(path);
 115
 116 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__) || defined(__DragonFly__)
 117         struct statfs buf;
 118
 119         if (statfs(path, &buf) == -1)
 120                 return;
 121 #else
 122         struct statvfs buf;
 123
 124         if (statvfs(path, &buf) == -1)
 125                 return;
 126 #endif
 127
 128         if (low_threshold > 0 && below_threshold(buf, prefix_type, threshold_type, low_threshold)) {
 129                 START_COLOR("color_bad");
 130                 colorful_output = true;
 131         }
 132
 133         for (walk = format; *walk != '\0'; walk++) {
 134                 if (*walk != '%') {
 135                         *(outwalk++) = *walk;
 136                         continue;
 137                 }
 138
 139                 if (BEGINS_WITH(walk+1, "free")) {
 140                         outwalk += print_bytes_human(outwalk, (uint64_t)buf.f_bsize * (uint64_t)buf.f_bfree, prefix_type);
 141                         walk += strlen("free");
 142                 }
 143
 144                 if (BEGINS_WITH(walk+1, "used")) {
 145                         outwalk += print_bytes_human(outwalk, (uint64_t)buf.f_bsize * ((uint64_t)buf.f_blocks - (uint64_t)buf.f_bfree), prefix_type);
 146                         walk += strlen("used");
 147                 }
 148
 149                 if (BEGINS_WITH(walk+1, "total")) {
 150                         outwalk += print_bytes_human(outwalk, (uint64_t)buf.f_bsize * (uint64_t)buf.f_blocks, prefix_type);
 151                         walk += strlen("total");
 152                 }
 153
 154                 if (BEGINS_WITH(walk+1, "avail")) {
 155                         outwalk += print_bytes_human(outwalk, (uint64_t)buf.f_bsize * (uint64_t)buf.f_bavail, prefix_type);
 156                         walk += strlen("avail");
 157                 }
 158
 159                 if (BEGINS_WITH(walk+1, "percentage_free")) {
 160                         outwalk += sprintf(outwalk, "%.01f%%", 100.0 * (double)buf.f_bfree / (double)buf.f_blocks);
 161                         walk += strlen("percentage_free");
 162                 }
 163
 164                 if (BEGINS_WITH(walk+1, "percentage_used_of_avail")) {
 165                         outwalk += sprintf(outwalk, "%.01f%%", 100.0 * (double)(buf.f_blocks - buf.f_bavail) / (double)buf.f_blocks);
 166                         walk += strlen("percentage_used_of_avail");
 167                 }
 168
 169                 if (BEGINS_WITH(walk+1, "percentage_used")) {
 170                         outwalk += sprintf(outwalk, "%.01f%%", 100.0 * (double)(buf.f_blocks - buf.f_bfree) / (double)buf.f_blocks);
 171                         walk += strlen("percentage_used");
 172                 }
 173
 174                 if (BEGINS_WITH(walk+1, "percentage_avail")) {
 175                         outwalk += sprintf(outwalk, "%.01f%%", 100.0 * (double)buf.f_bavail / (double)buf.f_blocks);
 176                         walk += strlen("percentage_avail");
 177                 }
 178         }
 179
 180         if (colorful_output)
 181                 END_COLOR;
 182
 183         *outwalk = '\0';
 184         OUTPUT_FULL_TEXT(buffer);
 185 }