265 lines
6.6 KiB
C
265 lines
6.6 KiB
C
/*
|
|
* Copyright (c) 2014 Jonas 'Sortie' Termansen.
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*
|
|
* sleep.c
|
|
* Suspend execution for an interval of time.
|
|
*/
|
|
|
|
#include <ctype.h>
|
|
#include <errno.h>
|
|
#include <error.h>
|
|
#include <locale.h>
|
|
#include <stdbool.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <time.h>
|
|
#include <timespec.h>
|
|
|
|
bool is_valid_interval(const char* string)
|
|
{
|
|
size_t index = 0;
|
|
while ( '0' <= string[index] && string[index] <= '9' )
|
|
index++;
|
|
if ( string[index] == '.' )
|
|
{
|
|
index++;
|
|
while ( '0' <= string[index] && string[index] <= '9' )
|
|
index++;
|
|
if ( index == 1 && string[index-1] == '.' )
|
|
return false;
|
|
}
|
|
if ( index == 0 )
|
|
return false;
|
|
return strcmp(string + index, "ns") == 0 ||
|
|
strcmp(string + index, "us") == 0 ||
|
|
strcmp(string + index, "ms") == 0 ||
|
|
strcmp(string + index, "") == 0 ||
|
|
strcmp(string + index, "s") == 0 ||
|
|
strcmp(string + index, "m") == 0 ||
|
|
strcmp(string + index, "h") == 0 ||
|
|
strcmp(string + index, "d") == 0;
|
|
}
|
|
|
|
struct timespec parse_interval(const char* string)
|
|
{
|
|
struct timespec ts;
|
|
ts.tv_sec = 0;
|
|
ts.tv_nsec = 0;
|
|
size_t index = 0;
|
|
|
|
while ( '0' <= string[index] && string[index] <= '9' )
|
|
{
|
|
char c = string[index++];
|
|
// TODO: Prevent the multiplication from overflowing!
|
|
ts.tv_sec = ts.tv_sec * 10;
|
|
// TODO: Prevent the addition from overflowing!
|
|
ts.tv_sec += c - '0';
|
|
}
|
|
|
|
if ( string[index] == '.' )
|
|
{
|
|
index++;
|
|
|
|
// Pick 9 digits as nanoseconds.
|
|
long contribution = 100L * 1000L * 1000L;
|
|
while ( contribution && '0' <= string[index] && string[index] <= '9' )
|
|
{
|
|
char c = string[index++];
|
|
ts.tv_nsec += (c - '0') * contribution;
|
|
contribution /= 10;
|
|
}
|
|
|
|
// Remember whether there are more non-zero digits we didn't handle.
|
|
bool any_non_zero_digits = false;
|
|
for ( size_t i = index; string[i]; i++ )
|
|
{
|
|
if ( !('0' <= string[i] && string[i] <= '9') )
|
|
break;
|
|
if ( string[i] - '0' != 0 )
|
|
any_non_zero_digits = true;
|
|
}
|
|
|
|
// If there are more digits we didn't handle, we'll round based on that.
|
|
if ( '0' <= string[index] && string[index] <= '9' )
|
|
{
|
|
char c = string[index++];
|
|
if ( 5 <= c - '0' )
|
|
ts.tv_nsec++;
|
|
if ( ts.tv_nsec == 1000000000L )
|
|
{
|
|
ts.tv_nsec = 0;
|
|
// TODO: This could overflow, which case we shouldn't have added
|
|
// 1 to tv_nsec regardless.
|
|
ts.tv_sec++;
|
|
}
|
|
}
|
|
|
|
// If all the digits we handled were zeroes, but there were some obscure
|
|
// non-zero digits we didn't handle, we'll wait at least a nanosecond.
|
|
if ( ts.tv_sec == 0 && ts.tv_nsec == 0 && any_non_zero_digits )
|
|
ts.tv_nsec = 1;
|
|
}
|
|
|
|
if ( !strcmp(string + index, "ns") )
|
|
{
|
|
ts.tv_nsec = ts.tv_sec % 1000000000L;
|
|
ts.tv_sec /= 1000000000L;
|
|
}
|
|
|
|
if ( !strcmp(string + index, "us") )
|
|
{
|
|
ts.tv_nsec /= 1000000L;
|
|
ts.tv_nsec += (ts.tv_sec % 1000000L) * 1000L;
|
|
ts.tv_sec /= 1000000L;
|
|
}
|
|
|
|
if ( !strcmp(string + index, "ms") )
|
|
{
|
|
ts.tv_nsec /= 1000L;
|
|
ts.tv_nsec += (ts.tv_sec % 1000L) * 100000L;
|
|
ts.tv_sec /= 1000L;
|
|
}
|
|
|
|
if ( !strcmp(string + index, "") || !strcmp(string + index, "s") )
|
|
{
|
|
}
|
|
|
|
if ( !strcmp(string + index, "m") )
|
|
{
|
|
// TODO: Properly handle overflow here!
|
|
ts.tv_nsec *= 60;
|
|
ts.tv_sec *= 60;
|
|
ts = timespec_canonalize(ts);
|
|
}
|
|
|
|
if ( !strcmp(string + index, "h") )
|
|
{
|
|
// TODO: Properly handle overflow here!
|
|
ts.tv_nsec *= 3600;
|
|
ts.tv_sec *= 3600;
|
|
ts = timespec_canonalize(ts);
|
|
}
|
|
|
|
if ( !strcmp(string + index, "d") )
|
|
{
|
|
// TODO: Properly handle overflow here!
|
|
ts.tv_nsec *= 86400;
|
|
ts.tv_sec *= 86400;
|
|
ts = timespec_canonalize(ts);
|
|
}
|
|
|
|
return ts;
|
|
}
|
|
|
|
static void compact_arguments(int* argc, char*** argv)
|
|
{
|
|
for ( int i = 0; i < *argc; i++ )
|
|
{
|
|
while ( i < *argc && !(*argv)[i] )
|
|
{
|
|
for ( int n = i; n < *argc; n++ )
|
|
(*argv)[n] = (*argv)[n+1];
|
|
(*argc)--;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void help(FILE* fp, const char* argv0)
|
|
{
|
|
fprintf(fp, "Usage: %s [OPTION]... NUMBER[SUFFIX]...\n", argv0);
|
|
fprintf(fp, "Pause for NUMBER seconds. SUFFIX may be 's' for seconds (the default),\n");
|
|
fprintf(fp, "'m' for minutes, 'h' for hours or 'd' for days. Unlike most implementations\n");
|
|
fprintf(fp, "that require NUMBER be an integer, here NUMBER may be an arbitrary floating\n");
|
|
fprintf(fp, "point number. Given two or more arguments, pause for the amount of time\n");
|
|
fprintf(fp, "specified by the sum of their values.\n");
|
|
fprintf(fp, "\n");
|
|
fprintf(fp, " --help display this help and exit\n");
|
|
fprintf(fp, " --version output version information and exit\n");
|
|
}
|
|
|
|
static void version(FILE* fp, const char* argv0)
|
|
{
|
|
fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
|
|
}
|
|
|
|
int main(int argc, char* argv[])
|
|
{
|
|
setlocale(LC_ALL, "");
|
|
|
|
const char* argv0 = argv[0];
|
|
for ( int i = 1; i < argc; i++ )
|
|
{
|
|
const char* arg = argv[i];
|
|
if ( arg[0] != '-' || !arg[1] )
|
|
continue;
|
|
argv[i] = NULL;
|
|
if ( !strcmp(arg, "--") )
|
|
break;
|
|
if ( arg[1] != '-' )
|
|
{
|
|
char c;
|
|
while ( (c = *++arg) ) switch ( c )
|
|
{
|
|
default:
|
|
fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
|
|
help(stderr, argv0);
|
|
exit(1);
|
|
}
|
|
}
|
|
else if ( !strcmp(arg, "--help") )
|
|
help(stdout, argv0), exit(0);
|
|
else if ( !strcmp(arg, "--version") )
|
|
version(stdout, argv0), exit(0);
|
|
else
|
|
{
|
|
fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
|
|
help(stderr, argv0);
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
compact_arguments(&argc, &argv);
|
|
|
|
if ( argc < 2 )
|
|
{
|
|
error(0, errno, "missing operand");
|
|
fprintf(stderr, "Try '%s --help' for more information.\n", argv[0]);
|
|
exit(1);
|
|
}
|
|
|
|
struct timespec ts = timespec_nul();
|
|
|
|
for ( int i = 1; i < argc; i++ )
|
|
{
|
|
const char* arg = argv[i];
|
|
if ( !is_valid_interval(arg) )
|
|
{
|
|
error(0, errno, "invalid sleep interval `%s'", arg);
|
|
fprintf(stderr, "Try '%s --help' for more information.\n", argv[0]);
|
|
exit(1);
|
|
}
|
|
ts = timespec_add(ts, parse_interval(arg));
|
|
}
|
|
|
|
while ( ts.tv_sec || ts.tv_nsec )
|
|
{
|
|
if ( clock_nanosleep(CLOCK_REALTIME, 0, &ts, &ts) != 0 )
|
|
error(1, errno, "clock_nanosleep");
|
|
}
|
|
|
|
return 0;
|
|
}
|