1 /* $NetBSD: subr_humanize.c,v 1.1 2009/10/02 15:48:41 pooka Exp $ */
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7 * This code is derived from software contributed to The NetBSD Foundation
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37 * snprintf() `bytes' into `buf', reformatting it so that the number,
38 * plus a possible `x' + suffix extension) fits into len bytes (including
39 * the terminating NUL).
40 * Returns the number of bytes stored in buf, or -1 if there was a problem.
41 * E.g, given a len of 9 and a suffix of `B':
50 humanize_unsigned(char *buf, size_t len, uint64_t bytes, const char *suffix,
53 /* prefixes are: (none), kilo, Mega, Giga, Tera, Peta, Exa */
59 if (buf == NULL || suffix == NULL)
63 suffixlen = strlen(suffix);
64 /* check if enough room for `x y' + suffix + `\0' */
65 if (len < 4 + suffixlen)
68 if (divisor == 1024) {
71 * XXX IEC 60027-2 recommends Ki, Mi, Gi...
75 prefixes = " kMGTPE"; /* SI for decimal multiplies */
78 for (i = 0; i < len - suffixlen - 3; i++) {
83 for (i = 0; bytes >= umax && prefixes[i + 1]; i++)
86 r = snprintf(buf, len, "%qu%s%c%s", (unsigned long long)bytes,
87 i == 0 ? "" : " ", prefixes[i], suffix);
93 format_bytes(char *buf, size_t len, uint64_t bytes)
98 rv = humanize_unsigned(buf, len, bytes, "B", 1024);
100 /* nuke the trailing ` B' if it exists */
101 nlen = strlen(buf) - 2;
102 if (strcmp(&buf[nlen], " B") == 0)