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/* $OpenBSD: ts.c,v 1.1 2022/06/29 08:39:49 job Exp $ */
/*
* Copyright (c) 2022 Job Snijders <job@openbsd.org>
* Copyright (c) 2022 Claudio Jeker <claudio@openbsd.org>
*
* 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.
*/
#include <sys/cdefs.h>
#include <sys/time.h>
#include <err.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
static char *format = "%b %d %H:%M:%S";
static char *buf;
static char *outbuf;
static size_t bufsize;
static void fmtfmt(struct tm *, long);
static void __dead usage(void);
int
main(int argc, char *argv[])
{
int iflag, sflag;
int ch, prev;
struct timespec start, now, elapsed;
struct tm *lt, tm;
if (pledge("stdio", NULL) == -1)
err(1, "pledge");
iflag = sflag = 0;
while ((ch = getopt(argc, argv, "is")) != -1) {
switch (ch) {
case 'i':
iflag = 1;
format = "%H:%M:%S";
break;
case 's':
sflag = 1;
format = "%H:%M:%S";
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if ((iflag && sflag) || argc > 1)
usage();
if (argc == 1)
format = *argv;
bufsize = strlen(format);
if (bufsize > SIZE_MAX / 10)
errx(1, "format string too big");
bufsize *= 10;
if ((buf = calloc(1, bufsize)) == NULL)
err(1, NULL);
if ((outbuf = calloc(1, bufsize)) == NULL)
err(1, NULL);
clock_gettime(CLOCK_MONOTONIC, &start);
for (prev = '\n'; (ch = getchar()) != EOF; prev = ch) {
if (prev == '\n') {
if (iflag || sflag) {
if (clock_gettime(CLOCK_MONOTONIC, &now))
err(1, "clock_gettime");
timespecsub(&now, &start, &elapsed);
if (gmtime_r(&elapsed.tv_sec, &tm) == NULL)
err(1, "gmtime_r");
if (iflag)
clock_gettime(CLOCK_MONOTONIC, &start);
fmtfmt(&tm, elapsed.tv_nsec);
} else {
if (clock_gettime(CLOCK_REALTIME, &now))
err(1, "clock_gettime");
lt = localtime(&now.tv_sec);
if (lt == NULL)
err(1, "localtime");
fmtfmt(lt, now.tv_nsec);
}
}
if (putchar(ch) == EOF)
break;
}
if (fclose(stdout))
err(1, "stdout");
return 0;
}
static void __dead
usage(void)
{
fprintf(stderr, "usage: %s [-i | -s] [format]\n", getprogname());
exit(1);
}
/*
* yo dawg, i heard you like format strings
* so i put format strings in your user supplied input
* so you can format while you format
*/
static void
fmtfmt(struct tm *tm, long tv_nsec)
{
char *f, ms[7];
snprintf(ms, sizeof(ms), "%06ld", tv_nsec / 1000);
strlcpy(buf, format, bufsize);
f = buf;
do {
while ((f = strchr(f, '%')) != NULL && f[1] == '%')
f += 2;
if (f == NULL)
break;
f++;
if (f[0] == '.' &&
(f[1] == 'S' || f[1] == 's' || f[1] == 'T')) {
size_t l;
f[0] = f[1];
f[1] = '.';
f += 2;
l = strlen(f);
memmove(f + 6, f, l + 1);
memcpy(f, ms, 6);
f += 6;
}
} while (*f != '\0');
if (strftime(outbuf, bufsize, buf, tm) == 0)
errx(1, "strftime");
fprintf(stdout, "%s ", outbuf);
if (ferror(stdout))
exit(1);
}
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