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/* $Id: whattime.c,v 1.5 2004/08/16 17:25:16 graziano Exp $ */
#include <stdio.h>
#include <string.h>
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#include <stdlib.h>
#include <unistd.h>
#define SWITCHES "af:"
/**
* print the usage of this executable
*/
void
usage(char *argv[])
{
fprintf(stderr, "Usage: %s [OPTION] time ...\n", argv[0]);
fprintf(stderr, "Translate seconds from epoch to friendlier time.\n\n");
fprintf(stderr, "\t-a alternative format (for scripts)\n");
fprintf(stderr, "\t-f file read from file (1st column is time).\n");
fflush(stderr);
exit(1);
}
/**
* print the translated number
*/
void
translate(int time_val, int alt)
{
time_t tmp;
char s[256]; /* hold the string to print */
tmp = time_val;
if (alt == 0) {
fprintf(stdout,"%d == %s", time_val, ctime(&tmp));
} else {
strftime(s, 256, "%d-%m-%Y/%H:%M:%S", localtime(&tmp));
printf("%s", s);
}
fflush(stdout);
}
/**
* translate seconds from the epoch to some human friendly time. It can
* print out a date suitable to be used in script (ie gnuplot will
* understand it easily): use the -a switch.
*/
int
main(int argc, char *argv[])
{
int time_val = 0;
int i, alt=0, opt;
char buffer[256];
FILE *file = NULL;
/* parse the command line */
while ((opt = getopt(argc, argv, SWITCHES)) != EOF) {
switch (opt) {
case 'a':
alt = 1;
break;
case 'f':
file = fopen(optarg, "r");
if (file == NULL) {
fprintf(stderr, "Couldn't open %s\n", optarg);
exit(1);
}
break;
default:
usage(argv);
break;
}
}
/* do the work */
if (file != NULL) {
while (fgets(buffer, 256, file) != NULL) {
if (sscanf(buffer, "%d", &time_val) != 0) {
translate(time_val, alt);
printf("%s", strchr(buffer, ' '));
}
}
} else {
for (i = optind; i < argc; i++) {
time_val = (int)strtol(argv[i], NULL, 10);
translate(time_val, alt);
}
}
if (file != NULL)
fclose(file);
return(0);
}
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