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/*
* Adds a timestamp before every line.
*
* Author: Peter Wu <lekensteyn@gmail.com>
* Date: 2013-10-04
*/
#include <stdio.h>
#include <time.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdbool.h>
static void print_usage(const char *program_name) {
fprintf(stderr, "Usage: %s [-d]\n", program_name);
fputs("Options:\n"
" -d Display time difference instead of a monotonic clock\n",
stderr);
}
struct timespec timediff(struct timespec begin, struct timespec end) {
struct timespec diff;
diff.tv_sec = end.tv_sec - begin.tv_sec;
diff.tv_nsec = end.tv_nsec - begin.tv_nsec;
if (end.tv_nsec < begin.tv_nsec) {
/* alternative case: 3.2 -> 4.1, diff is 0.9 */
diff.tv_sec--;
diff.tv_nsec += 1000000000;
}
return diff;
}
int main(int argc, char **argv) {
const char *out_format;
char buf[4096];
struct timespec tp[2] = { { 0, 0 } };
int tp_i = 0;
int opt;
bool diff = false;
while ((opt = getopt(argc, argv, "d")) != -1) {
switch (opt) {
case 'd':
diff = true;
break;
default:
print_usage(argv[0]);
return 1;
}
}
if (diff) {
out_format = "[%+6lld.%06lu] %s\n";
} else {
out_format = "[%6llu.%06lu] %s\n";
}
while (fgets(buf, sizeof(buf), stdin) != NULL) {
char *newline = strrchr(buf, '\n');
clock_gettime(CLOCK_MONOTONIC, &tp[tp_i]);
if (newline)
*newline = '\0';
if (diff) {
/* new time is available in "tp_i". Old time (and print
* target) is the inverse of tp_i (modulo 2). */
tp[tp_i ^ 1] = timediff(tp[tp_i ^ 1], tp[tp_i]);
/* flip such that "tp_i" refers to difference time and
* inverse "tp_i" points to the new time (in the next
* iteration it becomes the old time) */
tp_i ^= 1;
}
printf(out_format,
(long long) tp[tp_i].tv_sec,
tp[tp_i].tv_nsec / 1000,
buf);
}
return 0;
}
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