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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 14:18:53 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 14:18:53 +0000 |
commit | a0e0018c9a7ef5ce7f6d2c3ae16aecbbd16a8f67 (patch) | |
tree | 8feaf1a1932871b139b3b30be4c09c66489918be /lib/utils_math.c | |
parent | Initial commit. (diff) | |
download | iproute2-upstream/6.1.0.tar.xz iproute2-upstream/6.1.0.zip |
Adding upstream version 6.1.0.upstream/6.1.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | lib/utils_math.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/lib/utils_math.c b/lib/utils_math.c new file mode 100644 index 0000000..9ef3dd6 --- /dev/null +++ b/lib/utils_math.c @@ -0,0 +1,123 @@ +// SPDX-License-Identifier: GPL-2.0+ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <math.h> +#include <asm/types.h> + +#include "utils.h" + +/* See http://physics.nist.gov/cuu/Units/binary.html */ +static const struct rate_suffix { + const char *name; + double scale; +} suffixes[] = { + { "bit", 1. }, + { "Kibit", 1024. }, + { "kbit", 1000. }, + { "mibit", 1024.*1024. }, + { "mbit", 1000000. }, + { "gibit", 1024.*1024.*1024. }, + { "gbit", 1000000000. }, + { "tibit", 1024.*1024.*1024.*1024. }, + { "tbit", 1000000000000. }, + { "Bps", 8. }, + { "KiBps", 8.*1024. }, + { "KBps", 8000. }, + { "MiBps", 8.*1024*1024. }, + { "MBps", 8000000. }, + { "GiBps", 8.*1024.*1024.*1024. }, + { "GBps", 8000000000. }, + { "TiBps", 8.*1024.*1024.*1024.*1024. }, + { "TBps", 8000000000000. }, + { NULL } +}; + +int get_rate(unsigned int *rate, const char *str) +{ + char *p; + double bps = strtod(str, &p); + const struct rate_suffix *s; + + if (p == str) + return -1; + + for (s = suffixes; s->name; ++s) { + if (strcasecmp(s->name, p) == 0) { + bps *= s->scale; + p += strlen(p); + break; + } + } + + if (*p) + return -1; /* unknown suffix */ + + bps /= 8; /* -> bytes per second */ + *rate = bps; + /* detect if an overflow happened */ + if (*rate != floor(bps)) + return -1; + return 0; +} + +int get_rate64(__u64 *rate, const char *str) +{ + char *p; + double bps = strtod(str, &p); + const struct rate_suffix *s; + + if (p == str) + return -1; + + for (s = suffixes; s->name; ++s) { + if (strcasecmp(s->name, p) == 0) { + bps *= s->scale; + p += strlen(p); + break; + } + } + + if (*p) + return -1; /* unknown suffix */ + + bps /= 8; /* -> bytes per second */ + *rate = bps; + return 0; +} + +int get_size(unsigned int *size, const char *str) +{ + double sz; + char *p; + + sz = strtod(str, &p); + if (p == str) + return -1; + + if (*p) { + if (strcasecmp(p, "kb") == 0 || strcasecmp(p, "k") == 0) + sz *= 1024; + else if (strcasecmp(p, "gb") == 0 || strcasecmp(p, "g") == 0) + sz *= 1024*1024*1024; + else if (strcasecmp(p, "gbit") == 0) + sz *= 1024*1024*1024/8; + else if (strcasecmp(p, "mb") == 0 || strcasecmp(p, "m") == 0) + sz *= 1024*1024; + else if (strcasecmp(p, "mbit") == 0) + sz *= 1024*1024/8; + else if (strcasecmp(p, "kbit") == 0) + sz *= 1024/8; + else if (strcasecmp(p, "b") != 0) + return -1; + } + + *size = sz; + + /* detect if an overflow happened */ + if (*size != floor(sz)) + return -1; + + return 0; +} |