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;
+
+}