diff options
Diffstat (limited to '')
-rw-r--r-- | src/basic/format-util.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/src/basic/format-util.c b/src/basic/format-util.c new file mode 100644 index 0000000..9450185 --- /dev/null +++ b/src/basic/format-util.c @@ -0,0 +1,101 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include "format-util.h" +#include "memory-util.h" +#include "stdio-util.h" +#include "strxcpyx.h" + +assert_cc(STRLEN("%") + DECIMAL_STR_MAX(int) <= IF_NAMESIZE); +int format_ifname_full(int ifindex, FormatIfnameFlag flag, char buf[static IF_NAMESIZE]) { + if (ifindex <= 0) + return -EINVAL; + + if (if_indextoname(ifindex, buf)) + return 0; + + if (!FLAGS_SET(flag, FORMAT_IFNAME_IFINDEX)) + return -errno; + + if (FLAGS_SET(flag, FORMAT_IFNAME_IFINDEX_WITH_PERCENT)) + assert(snprintf_ok(buf, IF_NAMESIZE, "%%%d", ifindex)); + else + assert(snprintf_ok(buf, IF_NAMESIZE, "%d", ifindex)); + + return 0; +} + +int format_ifname_full_alloc(int ifindex, FormatIfnameFlag flag, char **ret) { + char buf[IF_NAMESIZE], *copy; + int r; + + assert(ret); + + r = format_ifname_full(ifindex, flag, buf); + if (r < 0) + return r; + + copy = strdup(buf); + if (!copy) + return -ENOMEM; + + *ret = copy; + return 0; +} + +char *format_bytes_full(char *buf, size_t l, uint64_t t, FormatBytesFlag flag) { + typedef struct { + const char *suffix; + uint64_t factor; + } suffix_table; + static const suffix_table table_iec[] = { + { "E", UINT64_C(1024)*UINT64_C(1024)*UINT64_C(1024)*UINT64_C(1024)*UINT64_C(1024)*UINT64_C(1024) }, + { "P", UINT64_C(1024)*UINT64_C(1024)*UINT64_C(1024)*UINT64_C(1024)*UINT64_C(1024) }, + { "T", UINT64_C(1024)*UINT64_C(1024)*UINT64_C(1024)*UINT64_C(1024) }, + { "G", UINT64_C(1024)*UINT64_C(1024)*UINT64_C(1024) }, + { "M", UINT64_C(1024)*UINT64_C(1024) }, + { "K", UINT64_C(1024) }, + }, table_si[] = { + { "E", UINT64_C(1000)*UINT64_C(1000)*UINT64_C(1000)*UINT64_C(1000)*UINT64_C(1000)*UINT64_C(1000) }, + { "P", UINT64_C(1000)*UINT64_C(1000)*UINT64_C(1000)*UINT64_C(1000)*UINT64_C(1000) }, + { "T", UINT64_C(1000)*UINT64_C(1000)*UINT64_C(1000)*UINT64_C(1000) }, + { "G", UINT64_C(1000)*UINT64_C(1000)*UINT64_C(1000) }, + { "M", UINT64_C(1000)*UINT64_C(1000) }, + { "K", UINT64_C(1000) }, + }; + const suffix_table *table; + size_t n; + + assert_cc(ELEMENTSOF(table_iec) == ELEMENTSOF(table_si)); + + if (t == UINT64_MAX) + return NULL; + + table = flag & FORMAT_BYTES_USE_IEC ? table_iec : table_si; + n = ELEMENTSOF(table_iec); + + for (size_t i = 0; i < n; i++) + if (t >= table[i].factor) { + if (flag & FORMAT_BYTES_BELOW_POINT) { + (void) snprintf(buf, l, + "%" PRIu64 ".%" PRIu64 "%s", + t / table[i].factor, + i != n - 1 ? + (t / table[i + 1].factor * UINT64_C(10) / table[n - 1].factor) % UINT64_C(10): + (t * UINT64_C(10) / table[i].factor) % UINT64_C(10), + table[i].suffix); + } else + (void) snprintf(buf, l, + "%" PRIu64 "%s", + t / table[i].factor, + table[i].suffix); + + goto finish; + } + + (void) snprintf(buf, l, "%" PRIu64 "%s", t, flag & FORMAT_BYTES_TRAILING_B ? "B" : ""); + +finish: + buf[l-1] = 0; + return buf; + +} |