src/basic/format-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include "format-util.h"
   4 #include "memory-util.h"
   5 #include "stdio-util.h"
   6
   7 assert_cc(DECIMAL_STR_MAX(int) + 1 <= IF_NAMESIZE + 1);
   8 char *format_ifname_full(int ifindex, char buf[static IF_NAMESIZE + 1], FormatIfnameFlag flag) {
   9         /* Buffer is always cleared */
  10         memzero(buf, IF_NAMESIZE + 1);
  11         if (if_indextoname(ifindex, buf))
  12                 return buf;
  13
  14         if (!FLAGS_SET(flag, FORMAT_IFNAME_IFINDEX))
  15                 return NULL;
  16
  17         if (FLAGS_SET(flag, FORMAT_IFNAME_IFINDEX_WITH_PERCENT))
  18                 snprintf(buf, IF_NAMESIZE + 1, "%%%d", ifindex);
  19         else
  20                 snprintf(buf, IF_NAMESIZE + 1, "%d", ifindex);
  21
  22         return buf;
  23 }
  24
  25 char *format_bytes_full(char *buf, size_t l, uint64_t t, FormatBytesFlag flag) {
  26         typedef struct {
  27                 const char *suffix;
  28                 uint64_t factor;
  29         } suffix_table;
  30         static const suffix_table table_iec[] = {
  31                 { "E", UINT64_C(1024)*UINT64_C(1024)*UINT64_C(1024)*UINT64_C(1024)*UINT64_C(1024)*UINT64_C(1024) },
  32                 { "P", UINT64_C(1024)*UINT64_C(1024)*UINT64_C(1024)*UINT64_C(1024)*UINT64_C(1024) },
  33                 { "T", UINT64_C(1024)*UINT64_C(1024)*UINT64_C(1024)*UINT64_C(1024) },
  34                 { "G", UINT64_C(1024)*UINT64_C(1024)*UINT64_C(1024) },
  35                 { "M", UINT64_C(1024)*UINT64_C(1024) },
  36                 { "K", UINT64_C(1024) },
  37         }, table_si[] = {
  38                 { "E", UINT64_C(1000)*UINT64_C(1000)*UINT64_C(1000)*UINT64_C(1000)*UINT64_C(1000)*UINT64_C(1000) },
  39                 { "P", UINT64_C(1000)*UINT64_C(1000)*UINT64_C(1000)*UINT64_C(1000)*UINT64_C(1000) },
  40                 { "T", UINT64_C(1000)*UINT64_C(1000)*UINT64_C(1000)*UINT64_C(1000) },
  41                 { "G", UINT64_C(1000)*UINT64_C(1000)*UINT64_C(1000) },
  42                 { "M", UINT64_C(1000)*UINT64_C(1000) },
  43                 { "K", UINT64_C(1000) },
  44         };
  45         const suffix_table *table;
  46         size_t n, i;
  47
  48         assert_cc(ELEMENTSOF(table_iec) == ELEMENTSOF(table_si));
  49
  50         if (t == (uint64_t) -1)
  51                 return NULL;
  52
  53         table = flag & FORMAT_BYTES_USE_IEC ? table_iec : table_si;
  54         n = ELEMENTSOF(table_iec);
  55
  56         for (i = 0; i < n; i++)
  57                 if (t >= table[i].factor) {
  58                         if (flag & FORMAT_BYTES_BELOW_POINT) {
  59                                 snprintf(buf, l,
  60                                          "%" PRIu64 ".%" PRIu64 "%s",
  61                                          t / table[i].factor,
  62                                          i != n - 1 ?
  63                                          (t / table[i + 1].factor * UINT64_C(10) / table[n - 1].factor) % UINT64_C(10):
  64                                          (t * UINT64_C(10) / table[i].factor) % UINT64_C(10),
  65                                          table[i].suffix);
  66                         } else
  67                                 snprintf(buf, l,
  68                                          "%" PRIu64 "%s",
  69                                          t / table[i].factor,
  70                                          table[i].suffix);
  71
  72                         goto finish;
  73                 }
  74
  75         snprintf(buf, l, "%" PRIu64 "%s", t, flag & FORMAT_BYTES_TRAILING_B ? "B" : "");
  76
  77 finish:
  78         buf[l-1] = 0;
  79         return buf;
  80
  81 }