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 <mntent.h>
   7 #include <stdint.h>
   8 #include <sys/stat.h>
   9 #include <sys/statvfs.h>
  10 #include <sys/types.h>
  11 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || (__OpenBSD__) || defined(__DragonFly__)
  12 #include <sys/param.h>
  13 #include <sys/mount.h>
  14 #endif
  15 #include <yajl/yajl_gen.h>
  16 #include <yajl/yajl_version.h>
  17
  18 #include "i3status.h"
  19
  20 #define BINARY_BASE UINT64_C(1024)
  21 #define DECIMAL_BASE UINT64_C(1000)
  22
  23 #define MAX_EXPONENT 4
  24
  25 static const char * const iec_symbols[MAX_EXPONENT+1] = {"", "Ki", "Mi", "Gi", "Ti"};
  26 static const char * const si_symbols[MAX_EXPONENT+1] = {"", "k", "M", "G", "T"};
  27 static const char * const custom_symbols[MAX_EXPONENT+1] = {"", "K", "M", "G", "T"};
  28
  29 /*
  30  * Formats bytes according to the given base and set of symbols.
  31  *
  32  */
  33 static int format_bytes(char *outwalk, uint64_t bytes, uint64_t base, const char * const symbols[]) {
  34         double size = bytes;
  35         int exponent = 0;
  36         while (size >= base && exponent < MAX_EXPONENT) {
  37                 size /= base;
  38                 exponent += 1;
  39         }
  40         return sprintf(outwalk, "%.1f %sB", size, symbols[exponent]);
  41 }
  42
  43 /*
  44  * Prints the given amount of bytes in a human readable manner.
  45  *
  46  */
  47 static int print_bytes_human(char *outwalk, uint64_t bytes, const char *prefix_type) {
  48         if (strcasecmp(prefix_type, "decimal") == 0) {
  49                 return format_bytes(outwalk, bytes, DECIMAL_BASE, si_symbols);
  50         } else if (strcasecmp(prefix_type, "custom") == 0) {
  51                 return format_bytes(outwalk, bytes, BINARY_BASE, custom_symbols);
  52         } else {
  53                 return format_bytes(outwalk, bytes, BINARY_BASE, iec_symbols);
  54         }
  55 }
  56
  57 /*
  58  * Determines whether remaining bytes are below given threshold.
  59  *
  60  */
  61 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__) || defined(__DragonFly__)
  62 static bool below_threshold(struct statfs buf, const char *prefix_type, const char *threshold_type, const double low_threshold) {
  63 #else
  64 static bool below_threshold(struct statvfs buf, const char *prefix_type, const char *threshold_type, const double low_threshold) {
  65 #endif
  66         if (strcasecmp(threshold_type, "percentage_free") == 0) {
  67                 return 100.0 * (double)buf.f_bfree / (double)buf.f_blocks < low_threshold;
  68         } else if (strcasecmp(threshold_type, "percentage_avail") == 0) {
  69                 return 100.0 * (double)buf.f_bavail / (double)buf.f_blocks < low_threshold;
  70         } else if (strcasecmp(threshold_type, "bytes_free") == 0) {
  71                 return (double)buf.f_bsize * (double)buf.f_bfree < low_threshold;
  72         } else if (strcasecmp(threshold_type, "bytes_avail") == 0) {
  73                 return (double)buf.f_bsize * (double)buf.f_bavail < low_threshold;
  74         } else if (threshold_type[0] != '\0' && strncasecmp(threshold_type+1, "bytes_", strlen("bytes_")) == 0) {
  75                 uint64_t base = strcasecmp(prefix_type, "decimal") == 0 ? DECIMAL_BASE : BINARY_BASE;
  76                 double factor = 1;
  77
  78                 switch (threshold_type[0]) {
  79                 case 'T':
  80                 case 't':
  81                         factor *= base;
  82                 case 'G':
  83                 case 'g':
  84                         factor *= base;
  85                 case 'M':
  86                 case 'm':
  87                         factor *= base;
  88                 case 'K':
  89                 case 'k':
  90                         factor *= base;
  91                         break;
  92                 default:
  93                         return false;
  94                 }
  95
  96                 if (strcasecmp(threshold_type+1, "bytes_free") == 0) {
  97                         return (double)buf.f_bsize * (double)buf.f_bfree < low_threshold * factor;
  98                 } else if (strcasecmp(threshold_type+1, "bytes_avail") == 0) {
  99                         return (double)buf.f_bsize * (double)buf.f_bavail < low_threshold * factor;
 100                 }
 101         }
 102
 103         return false;
 104 }
 105
 106 /*
 107  * Does a statvfs and prints either free, used or total amounts of bytes in a
 108  * human readable manner.
 109  *
 110  */
 111 void print_disk_info(yajl_gen json_gen, char *buffer, const char *path, const char *format, const char *format_not_mounted, const char *prefix_type, const char *threshold_type, const double low_threshold) {
 112         const char *walk;
 113         char *outwalk = buffer;
 114         bool colorful_output = false;
 115
 116         INSTANCE(path);
 117
 118 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__) || defined(__DragonFly__)
 119         struct statfs buf;
 120
 121         if (statfs(path, &buf) == -1)
 122                 return;
 123 #else
 124         struct statvfs buf;
 125
 126         if (statvfs(path, &buf) == -1)
 127                 return;
 128
 129         if (format_not_mounted != NULL) {
 130                 FILE *mntentfile = setmntent("/etc/mtab", "r");
 131                 struct mntent *m;
 132                 bool found = false;
 133
 134                 while (NULL != (m = getmntent(mntentfile))) {
 135                         if (strcmp(m->mnt_dir, path) == 0) {
 136                                 found = true;
 137                                 break;
 138                         }
 139                 }
 140                 endmntent(mntentfile);
 141
 142                 if (!found) {
 143                         format = format_not_mounted;
 144                 }
 145         }
 146 #endif
 147
 148         if (low_threshold > 0 && below_threshold(buf, prefix_type, threshold_type, low_threshold)) {
 149                 START_COLOR("color_bad");
 150                 colorful_output = true;
 151         }
 152
 153         for (walk = format; *walk != '\0'; walk++) {
 154                 if (*walk != '%') {
 155                         *(outwalk++) = *walk;
 156                         continue;
 157                 }
 158
 159                 if (BEGINS_WITH(walk+1, "free")) {
 160                         outwalk += print_bytes_human(outwalk, (uint64_t)buf.f_bsize * (uint64_t)buf.f_bfree, prefix_type);
 161                         walk += strlen("free");
 162                 }
 163
 164                 if (BEGINS_WITH(walk+1, "used")) {
 165                         outwalk += print_bytes_human(outwalk, (uint64_t)buf.f_bsize * ((uint64_t)buf.f_blocks - (uint64_t)buf.f_bfree), prefix_type);
 166                         walk += strlen("used");
 167                 }
 168
 169                 if (BEGINS_WITH(walk+1, "total")) {
 170                         outwalk += print_bytes_human(outwalk, (uint64_t)buf.f_bsize * (uint64_t)buf.f_blocks, prefix_type);
 171                         walk += strlen("total");
 172                 }
 173
 174                 if (BEGINS_WITH(walk+1, "avail")) {
 175                         outwalk += print_bytes_human(outwalk, (uint64_t)buf.f_bsize * (uint64_t)buf.f_bavail, prefix_type);
 176                         walk += strlen("avail");
 177                 }
 178
 179                 if (BEGINS_WITH(walk+1, "percentage_free")) {
 180                         outwalk += sprintf(outwalk, "%.01f%%", 100.0 * (double)buf.f_bfree / (double)buf.f_blocks);
 181                         walk += strlen("percentage_free");
 182                 }
 183
 184                 if (BEGINS_WITH(walk+1, "percentage_used_of_avail")) {
 185                         outwalk += sprintf(outwalk, "%.01f%%", 100.0 * (double)(buf.f_blocks - buf.f_bavail) / (double)buf.f_blocks);
 186                         walk += strlen("percentage_used_of_avail");
 187                 }
 188
 189                 if (BEGINS_WITH(walk+1, "percentage_used")) {
 190                         outwalk += sprintf(outwalk, "%.01f%%", 100.0 * (double)(buf.f_blocks - buf.f_bfree) / (double)buf.f_blocks);
 191                         walk += strlen("percentage_used");
 192                 }
 193
 194                 if (BEGINS_WITH(walk+1, "percentage_avail")) {
 195                         outwalk += sprintf(outwalk, "%.01f%%", 100.0 * (double)buf.f_bavail / (double)buf.f_blocks);
 196                         walk += strlen("percentage_avail");
 197                 }
 198         }
 199
 200         if (colorful_output)
 201                 END_COLOR;
 202
 203         *outwalk = '\0';
 204         OUTPUT_FULL_TEXT(buffer);
 205 }