mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
270 lines
6.9 KiB
C
270 lines
6.9 KiB
C
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2014.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <http://www.gnu.org/licenses/>.
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sleep.c
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Suspend execution for an interval of time.
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*******************************************************************************/
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#include <ctype.h>
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#include <errno.h>
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#include <error.h>
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#include <locale.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <timespec.h>
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bool is_valid_interval(const char* string)
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{
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size_t index = 0;
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while ( '0' <= string[index] && string[index] <= '9' )
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index++;
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if ( string[index] == '.' )
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{
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index++;
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while ( '0' <= string[index] && string[index] <= '9' )
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index++;
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if ( index == 1 && string[index-1] == '.' )
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return false;
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}
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if ( index == 0 )
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return false;
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return strcmp(string + index, "ns") == 0 ||
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strcmp(string + index, "us") == 0 ||
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strcmp(string + index, "ms") == 0 ||
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strcmp(string + index, "") == 0 ||
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strcmp(string + index, "s") == 0 ||
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strcmp(string + index, "m") == 0 ||
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strcmp(string + index, "h") == 0 ||
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strcmp(string + index, "d") == 0;
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}
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struct timespec parse_interval(const char* string)
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{
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struct timespec ts;
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ts.tv_sec = 0;
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ts.tv_nsec = 0;
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size_t index = 0;
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while ( '0' <= string[index] && string[index] <= '9' )
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{
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char c = string[index++];
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// TODO: Prevent the multiplication from overflowing!
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ts.tv_sec = ts.tv_sec * 10;
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// TODO: Prevent the addition from overflowing!
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ts.tv_sec += c - '0';
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}
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if ( string[index] == '.' )
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{
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index++;
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// Pick 9 digits as nanoseconds.
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long contribution = 100L * 1000L * 1000L;
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while ( contribution && '0' <= string[index] && string[index] <= '9' )
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{
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char c = string[index++];
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ts.tv_nsec += (c - '0') * contribution;
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contribution /= 10;
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}
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// Remember whether there are more non-zero digits we didn't handle.
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bool any_non_zero_digits = false;
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for ( size_t i = index; string[i]; i++ )
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{
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if ( !('0' <= string[i] && string[i] <= '9') )
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break;
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if ( string[i] - '0' != 0 )
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any_non_zero_digits = true;
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}
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// If there are more digits we didn't handle, we'll round based on that.
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if ( '0' <= string[index] && string[index] <= '9' )
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{
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char c = string[index++];
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if ( 5 <= c - '0' )
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ts.tv_nsec++;
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if ( ts.tv_nsec == 1000000000L )
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{
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ts.tv_nsec = 0;
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// TODO: This could overflow, which case we shouldn't have added
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// 1 to tv_nsec regardless.
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ts.tv_sec++;
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}
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}
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// If all the digits we handled were zeroes, but there were some obscure
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// non-zero digits we didn't handle, we'll wait at least a nanosecond.
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if ( ts.tv_sec == 0 && ts.tv_nsec == 0 && any_non_zero_digits )
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ts.tv_nsec = 1;
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}
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if ( !strcmp(string + index, "ns") )
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{
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ts.tv_nsec = ts.tv_sec % 1000000000L;
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ts.tv_sec /= 1000000000L;
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}
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if ( !strcmp(string + index, "us") )
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{
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ts.tv_nsec /= 1000000L;
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ts.tv_nsec += (ts.tv_sec % 1000000L) * 1000L;
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ts.tv_sec /= 1000000L;
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}
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if ( !strcmp(string + index, "ms") )
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{
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ts.tv_nsec /= 1000L;
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ts.tv_nsec += (ts.tv_sec % 1000L) * 100000L;
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ts.tv_sec /= 1000L;
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}
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if ( !strcmp(string + index, "") || !strcmp(string + index, "s") )
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{
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}
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if ( !strcmp(string + index, "m") )
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{
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// TODO: Properly handle overflow here!
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ts.tv_nsec *= 60;
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ts.tv_sec *= 60;
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ts = timespec_canonalize(ts);
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}
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if ( !strcmp(string + index, "h") )
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{
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// TODO: Properly handle overflow here!
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ts.tv_nsec *= 3600;
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ts.tv_sec *= 3600;
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ts = timespec_canonalize(ts);
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}
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if ( !strcmp(string + index, "d") )
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{
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// TODO: Properly handle overflow here!
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ts.tv_nsec *= 86400;
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ts.tv_sec *= 86400;
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ts = timespec_canonalize(ts);
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}
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return ts;
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}
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static void compact_arguments(int* argc, char*** argv)
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{
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for ( int i = 0; i < *argc; i++ )
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{
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while ( i < *argc && !(*argv)[i] )
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{
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for ( int n = i; n < *argc; n++ )
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(*argv)[n] = (*argv)[n+1];
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(*argc)--;
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}
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}
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}
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static void help(FILE* fp, const char* argv0)
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{
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fprintf(fp, "Usage: %s [OPTION]... NUMBER[SUFFIX]...\n", argv0);
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fprintf(fp, "Pause for NUMBER seconds. SUFFIX may be 's' for seconds (the default),\n");
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fprintf(fp, "'m' for minutes, 'h' for hours or 'd' for days. Unlike most implementations\n");
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fprintf(fp, "that require NUMBER be an integer, here NUMBER may be an arbitrary floating\n");
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fprintf(fp, "point number. Given two or more arguments, pause for the amount of time\n");
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fprintf(fp, "specified by the sum of their values.\n");
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fprintf(fp, "\n");
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fprintf(fp, " --help display this help and exit\n");
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fprintf(fp, " --version output version information and exit\n");
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}
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static void version(FILE* fp, const char* argv0)
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{
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fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
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fprintf(fp, "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.\n");
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fprintf(fp, "This is free software: you are free to change and redistribute it.\n");
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fprintf(fp, "There is NO WARRANTY, to the extent permitted by law.\n");
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}
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int main(int argc, char* argv[])
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{
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setlocale(LC_ALL, "");
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const char* argv0 = argv[0];
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for ( int i = 1; i < argc; i++ )
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{
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const char* arg = argv[i];
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if ( arg[0] != '-' || !arg[1] )
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continue;
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argv[i] = NULL;
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if ( !strcmp(arg, "--") )
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break;
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if ( arg[1] != '-' )
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{
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char c;
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while ( (c = *++arg) ) switch ( c )
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{
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default:
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fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
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help(stderr, argv0);
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exit(1);
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}
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}
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else if ( !strcmp(arg, "--help") )
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help(stdout, argv0), exit(0);
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else if ( !strcmp(arg, "--version") )
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version(stdout, argv0), exit(0);
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else
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{
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fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
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help(stderr, argv0);
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exit(1);
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}
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}
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compact_arguments(&argc, &argv);
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if ( argc < 2 )
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{
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error(0, errno, "missing operand");
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fprintf(stderr, "Try '%s --help' for more information.\n", argv[0]);
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exit(1);
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}
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struct timespec ts = timespec_nul();
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for ( int i = 1; i < argc; i++ )
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{
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const char* arg = argv[i];
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if ( !is_valid_interval(arg) )
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{
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error(0, errno, "invalid sleep interval `%s'", arg);
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fprintf(stderr, "Try '%s --help' for more information.\n", argv[0]);
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exit(1);
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}
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ts = timespec_add(ts, parse_interval(arg));
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}
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while ( ts.tv_sec || ts.tv_nsec )
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{
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if ( clock_nanosleep(CLOCK_REALTIME, 0, &ts, &ts) != 0 )
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error(1, errno, "clock_nanosleep");
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}
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return 0;
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}
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