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@chaitanyav
Created June 21, 2013 01:28
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/*
* Author: NagaChaitanya Vellanki
*
* strptime example listing 10-3 of LPI book
*/
#define _XOPEN_SOURCE
#define BUF_SIZE 1000
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
char *my_strftime(const char *format, struct tm *tmp) {
static char buf[BUF_SIZE];
size_t s;
if(tmp == NULL) {
return NULL;
}
s = strftime(buf, BUF_SIZE, (format != NULL) ? format: "%A %B %d %I:%M:%S %p %Y %Z", tmp);
return (s == 0) ? NULL : buf;
}
void err_exit(const char *format, ...) {
va_list args;
va_start(args, format);
vfprintf(stderr, format, args);
va_end(args);
exit(EXIT_FAILURE);
}
int main(int argc, char *argv[]) {
struct tm tm;
if(argc < 3 || strcmp(argv[1], "--help") == 0) {
err_exit("Usage: %s input-date-time format-string [out-format]\n", argv[0]);
}
memset(&tm, 0, sizeof(struct tm));
if(strptime(argv[1], argv[2], &tm) == NULL) {
err_exit("Erron on strptime, %s\n", strerror(errno));
}
tm.tm_isdst = -1;
if(argc > 3) {
printf("%s\n", my_strftime(argv[3], &tm));
} else {
printf("%s\n", my_strftime(NULL, &tm));
}
exit(EXIT_SUCCESS);
}
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