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author | 2021-05-09 14:20:58 -0400 | |
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committer | 2021-05-09 14:20:58 -0400 | |
commit | 5fd83771641d15c418f747bd343ba6738d3875f7 (patch) | |
tree | 5abf0f78f680d9837dbd93d4d4c3933bb7509599 /shell_cmds/sleep/sleep.c | |
download | apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.tar.gz apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.tar.zst apple_cmds-5fd83771641d15c418f747bd343ba6738d3875f7.zip |
Import macOS userland
adv_cmds-176
basic_cmds-55
bootstrap_cmds-116.100.1
developer_cmds-66
diskdev_cmds-667.40.1
doc_cmds-53.60.1
file_cmds-321.40.3
mail_cmds-35
misc_cmds-34
network_cmds-606.40.1
patch_cmds-17
remote_cmds-63
shell_cmds-216.60.1
system_cmds-880.60.2
text_cmds-106
Diffstat (limited to 'shell_cmds/sleep/sleep.c')
-rw-r--r-- | shell_cmds/sleep/sleep.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/shell_cmds/sleep/sleep.c b/shell_cmds/sleep/sleep.c new file mode 100644 index 0000000..d41556c --- /dev/null +++ b/shell_cmds/sleep/sleep.c @@ -0,0 +1,131 @@ +/*- + * Copyright (c) 1988, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if 0 +#ifndef lint +static char const copyright[] = +"@(#) Copyright (c) 1988, 1993, 1994\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +static char sccsid[] = "@(#)sleep.c 8.3 (Berkeley) 4/2/94"; +#endif /* not lint */ +#endif +#include <sys/cdefs.h> +__FBSDID("$FreeBSD: src/bin/sleep/sleep.c,v 1.20 2005/08/07 09:11:38 stefanf Exp $"); + +#include <ctype.h> +#include <limits.h> +#include <stdio.h> +#include <stdlib.h> +#include <time.h> +#include <unistd.h> +#include <string.h> + +void usage(void); + +int +main(int argc, char *argv[]) +{ + struct timespec time_to_sleep; + long l; + int neg; + char *p; + + if (argc == 2) { + p = argv[1]; + } else if (argc == 3 && !strcmp("--", argv[1])) { + // POSIX issue: "sleep -- 3" should be the same as "sleep 3", + // normally getopt makes this kind of thing work, but sleep has + // no options, so we do it "the easy way" + p = argv[2]; + } else { + usage(); + return(1); + } + + /* Skip over leading whitespaces. */ + while (isspace((unsigned char)*p)) + ++p; + + /* Check for optional `+' or `-' sign. */ + neg = 0; + if (*p == '-') { + neg = 1; + ++p; + if (!isdigit((unsigned char)*p) && *p != '.') { + usage(); + return(1); + } + } + else if (*p == '+') + ++p; + + /* Calculate seconds. */ + if (isdigit((unsigned char)*p)) { + l = strtol(p, &p, 10); + if (l > INT_MAX) { + /* + * Avoid overflow when `seconds' is huge. This assumes + * that the maximum value for a time_t is <= INT_MAX. + */ + l = INT_MAX; + } + } else + l = 0; + time_to_sleep.tv_sec = (time_t)l; + + /* Calculate nanoseconds. */ + time_to_sleep.tv_nsec = 0; + + if (*p == '.') { /* Decimal point. */ + l = 100000000L; + do { + if (isdigit((unsigned char)*++p)) + time_to_sleep.tv_nsec += (*p - '0') * l; + else + break; + l /= 10; + } while (l); + } + + if (!neg && (time_to_sleep.tv_sec > 0 || time_to_sleep.tv_nsec > 0)) + (void)nanosleep(&time_to_sleep, (struct timespec *)NULL); + + return(0); +} + +void +usage(void) +{ + const char msg[] = "usage: sleep seconds\n"; + + write(STDERR_FILENO, msg, sizeof(msg) - 1); +} |