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/*
* This file uses code stolen from systemd to implement a smarter version of the `sleep` command.
*/
#include <assert.h>
#include <errno.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
// Misc. utitlites
#define streq(a, b) (strcmp((a), (b)) == 0)
#define strneq(a, b, n) (strncmp((a), (b), (n)) == 0)
#define ELEMENTSOF(x) (sizeof(x)/sizeof((x)[0]))
// String categories
#define WHITESPACE " \t\n\r"
#define DIGITS "0123456789"
// Type representing XXX.
typedef uint64_t nsec_t;
// Conversion rates
#define NSEC_PER_USEC ((nsec_t) 1000ULL)
#define NSEC_PER_MSEC ((nsec_t) 1000000ULL)
#define NSEC_PER_SEC ((nsec_t) 1000000000ULL)
#define NSEC_PER_MINUTE ((nsec_t) (60ULL*NSEC_PER_SEC))
#define NSEC_PER_HOUR ((nsec_t) (60ULL*NSEC_PER_MINUTE))
#define NSEC_PER_DAY ((nsec_t) (24ULL*NSEC_PER_HOUR))
#define NSEC_PER_WEEK ((nsec_t) (7ULL*NSEC_PER_DAY))
#define NSEC_PER_MONTH ((nsec_t) (2629800ULL*NSEC_PER_SEC))
#define NSEC_PER_YEAR ((nsec_t) (31557600ULL*NSEC_PER_SEC))
// XXX Constants
#define NSEC_INFINITY ((nsec_t) UINT64_MAX)
char *startswith(const char *s, const char *prefix) {
size_t l;
assert(s);
assert(prefix);
l = strlen(prefix);
if (!strneq(s, prefix, l))
return NULL;
return (char*) s + l;
}
static const char* extract_nsec_multiplier(const char *p, nsec_t *ret) {
static const struct {
const char *suffix;
nsec_t nsec;
} table[] = {
{ "seconds", NSEC_PER_SEC },
{ "second", NSEC_PER_SEC },
{ "sec", NSEC_PER_SEC },
{ "s", NSEC_PER_SEC },
{ "minutes", NSEC_PER_MINUTE },
{ "minute", NSEC_PER_MINUTE },
{ "min", NSEC_PER_MINUTE },
{ "months", NSEC_PER_MONTH },
{ "month", NSEC_PER_MONTH },
{ "M", NSEC_PER_MONTH },
{ "msec", NSEC_PER_MSEC },
{ "ms", NSEC_PER_MSEC },
{ "m", NSEC_PER_MINUTE },
{ "hours", NSEC_PER_HOUR },
{ "hour", NSEC_PER_HOUR },
{ "hr", NSEC_PER_HOUR },
{ "h", NSEC_PER_HOUR },
{ "days", NSEC_PER_DAY },
{ "day", NSEC_PER_DAY },
{ "d", NSEC_PER_DAY },
{ "weeks", NSEC_PER_WEEK },
{ "week", NSEC_PER_WEEK },
{ "w", NSEC_PER_WEEK },
{ "years", NSEC_PER_YEAR },
{ "year", NSEC_PER_YEAR },
{ "y", NSEC_PER_YEAR },
{ "usec", NSEC_PER_USEC },
{ "us", NSEC_PER_USEC },
{ "μs", NSEC_PER_USEC }, /* U+03bc (aka GREEK LETTER MU) */
{ "µs", NSEC_PER_USEC }, /* U+b5 (aka MICRO SIGN) */
{ "nsec", 1ULL },
{ "ns", 1ULL },
{ "", NSEC_PER_SEC }, /* CHANGED: default is sec */
};
size_t i;
assert(p);
assert(ret);
for (i = 0; i < ELEMENTSOF(table); i++) {
char *e;
e = startswith(p, table[i].suffix);
if (e) {
*ret = table[i].nsec;
return e;
}
}
return p;
}
int parse_nsec(const char *t, nsec_t *ret) {
const char *p, *s;
nsec_t nsec = 0;
bool something = false;
assert(t);
assert(ret);
p = t;
p += strspn(p, WHITESPACE);
s = startswith(p, "infinity");
if (s) {
s += strspn(s, WHITESPACE);
if (*s != 0)
return -EINVAL;
*ret = NSEC_INFINITY;
return 0;
}
for (;;) {
// CHANGED: Use seconds per default
nsec_t multiplier = 0, k;
long long l;
char *e;
p += strspn(p, WHITESPACE);
if (*p == 0) {
if (!something)
return -EINVAL;
break;
}
if (*p == '-') /* Don't allow "-0" */
return -ERANGE;
errno = 0;
l = strtoll(p, &e, 10);
if (errno > 0)
return -errno;
if (l < 0)
return -ERANGE;
if (*e == '.') {
p = e + 1;
p += strspn(p, DIGITS);
} else if (e == p)
return -EINVAL;
else
p = e;
s = extract_nsec_multiplier(p + strspn(p, WHITESPACE), &multiplier);
assert(multiplier != 0);
if (s == p && *s != '\0')
/* Don't allow '12.34.56', but accept '12.34 .56' or '12.34s.56' */
return -EINVAL;
p = s;
if ((nsec_t) l >= NSEC_INFINITY / multiplier)
return -ERANGE;
#if 0
printf("Using multiplier: %llu\n", multiplier);
#endif
k = (nsec_t) l * multiplier;
if (k >= NSEC_INFINITY - nsec)
return -ERANGE;
nsec += k;
something = true;
if (*e == '.') {
nsec_t m = multiplier / 10;
const char *b;
for (b = e + 1; *b >= '0' && *b <= '9'; b++, m /= 10) {
k = (nsec_t) (*b - '0') * m;
if (k >= NSEC_INFINITY - nsec)
return -ERANGE;
nsec += k;
}
/* Don't allow "0.-0", "3.+1", "3. 1", "3.sec" or "3.hoge" */
if (b == e + 1)
return -EINVAL;
}
}
*ret = nsec;
return 0;
}
static char *concat_arguments(int argc, char *argv[]) {
size_t buffer_length = 0;
for (int i = 1; i < argc; i++) {
buffer_length += strlen(argv[i]);
}
buffer_length += argc - 1; // spaces
char *buffer = calloc(1, buffer_length);
if (buffer == NULL) {
perror("failed to alloc (argument concatenation)");
}
for (int i = 1; i < argc; i++) {
if (i != 1) {
strlcat(buffer, " ", buffer_length);
}
strlcat(buffer, argv[i], buffer_length);
}
return buffer;
}
static void usage(FILE *fp) {
const char *name = "human-sleep";
fprintf(fp, "Usage: %s <description>\n\n", name);
fprintf(fp, "Description must be something like '1 day' or '2 hours'.\n");
fprintf(fp, "All arguments are concatenated.\n");
}
static void xnanosleep(struct timespec *ts) {
struct timespec remainder = *ts;
while (true) {
if (nanosleep(&remainder, &remainder) < 0) {
if (errno == EINTR) {
continue;
} else {
perror("failed to sleep");
exit(EXIT_FAILURE);
}
} else {
break; // successfully slept
}
}
}
int main(int argc, char *argv[])
{
#ifdef TEST
nsec_t u;
assert(parse_nsec("5s", &u) >= 0);
assert(u == 5 * NSEC_PER_SEC);
assert(parse_nsec("5s500ms", &u) >= 0);
assert(u == 5 * NSEC_PER_SEC + 500 * NSEC_PER_MSEC);
assert(parse_nsec(" 5s 500ms ", &u) >= 0);
assert(u == 5 * NSEC_PER_SEC + 500 * NSEC_PER_MSEC);
assert(parse_nsec(" 5.5s ", &u) >= 0);
assert(u == 5 * NSEC_PER_SEC + 500 * NSEC_PER_MSEC);
assert(parse_nsec(" 5.5s 0.5ms ", &u) >= 0);
assert(u == 5 * NSEC_PER_SEC + 500 * NSEC_PER_MSEC + 500 * NSEC_PER_USEC);
assert(parse_nsec(" .22s ", &u) >= 0);
assert(u == 220 * NSEC_PER_MSEC);
assert(parse_nsec(" .50y ", &u) >= 0);
assert(u == NSEC_PER_YEAR / 2);
assert(parse_nsec("2.5", &u) >= 0);
assert(u == 2);
assert(parse_nsec(".7", &u) >= 0);
assert(u == 0);
assert(parse_nsec("infinity", &u) >= 0);
assert(u == NSEC_INFINITY);
assert(parse_nsec(" infinity ", &u) >= 0);
assert(u == NSEC_INFINITY);
assert(parse_nsec("+3.1s", &u) >= 0);
assert(u == 3100 * NSEC_PER_MSEC);
assert(parse_nsec("3.1s.2", &u) >= 0);
assert(u == 3100 * NSEC_PER_MSEC);
assert(parse_nsec("3.1 .2s", &u) >= 0);
assert(u == 200 * NSEC_PER_MSEC + 3);
assert(parse_nsec("3.1 sec .2 sec", &u) >= 0);
assert(u == 3300 * NSEC_PER_MSEC);
assert(parse_nsec("3.1 sec 1.2 sec", &u) >= 0);
assert(u == 4300 * NSEC_PER_MSEC);
assert(parse_nsec(" xyz ", &u) < 0); // failures...
assert(parse_nsec("", &u) < 0);
assert(parse_nsec(" . ", &u) < 0);
assert(parse_nsec(" 5. ", &u) < 0);
assert(parse_nsec(".s ", &u) < 0);
assert(parse_nsec(" infinity .7", &u) < 0);
assert(parse_nsec(".3 infinity", &u) < 0);
assert(parse_nsec("-5s ", &u) < 0);
assert(parse_nsec("-0.3s ", &u) < 0);
assert(parse_nsec("-0.0s ", &u) < 0);
assert(parse_nsec("-0.-0s ", &u) < 0);
assert(parse_nsec("0.-0s ", &u) < 0);
assert(parse_nsec("3.-0s ", &u) < 0);
assert(parse_nsec(" infinity .7", &u) < 0);
assert(parse_nsec(".3 infinity", &u) < 0);
assert(parse_nsec("3.+1s", &u) < 0);
assert(parse_nsec("3. 1s", &u) < 0);
assert(parse_nsec("3.s", &u) < 0);
assert(parse_nsec("12.34.56", &u) < 0);
assert(parse_nsec("12..34", &u) < 0);
assert(parse_nsec("..1234", &u) < 0);
assert(parse_nsec("1234..", &u) < 0);
assert(parse_nsec("1111111111111y", &u) == -ERANGE);
assert(parse_nsec("1.111111111111y", &u) >= 0);
#endif
if (argc < 2) {
usage(stderr);
exit(EXIT_FAILURE);
}
for (int i = 1; i < argc; ++i) {
if (streq(argv[i], "--help") || streq(argv[i], "-h")) {
usage(stdout);
exit(EXIT_SUCCESS);
}
}
char *description = concat_arguments(argc, argv);
nsec_t result;
if (parse_nsec(description, &result) < 0) {
fprintf(stderr, "Cannot parse duration: %s\n", description);
exit(EXIT_FAILURE);
}
struct timespec ts;
ts.tv_sec = result / NSEC_PER_SEC;
ts.tv_nsec = result % NSEC_PER_SEC;
xnanosleep(&ts);
return EXIT_SUCCESS;
}
// vi: ft=c noet
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