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/*
* Copyright (C) 1995. Bill Brown <brown@gis.uiuc.edu> & Michael Shapiro
*
* This program is free software under the GPL (>=v2)
* Read the file GPL.TXT coming with GRASS for details.
*/
#include <stdio.h>
#include <string.h>
#include <grass/datetime.h>
static char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
/*!
* \brief
*
* formats DateTime structure as a human-readable string
* returns 0 when successful and 'buf' is filled with the string
* returns a negative number on error
*
* \param dt
* \param buf
* \return int
*/
int datetime_format(const DateTime *dt, char *buf)
{
/* Format the DateTime structure as a human-readable string */
/* Returns 0 when successful, and buf is filled with the
formatted data.
Returns a negative number as an error code if the DateTime
structure is not valid.
*/
char temp[128];
int n;
double sec;
*buf = 0;
if (!datetime_is_valid_type(dt))
return datetime_error_code();
if (datetime_is_absolute(dt)) {
if (datetime_get_day(dt, &n) == 0) {
sprintf(temp, "%d", n);
strcat(buf, temp);
}
if (datetime_get_month(dt, &n) == 0) {
if (*buf)
strcat(buf, " ");
strcat(buf, months[n - 1]);
}
if (datetime_get_year(dt, &n) == 0) {
if (*buf)
strcat(buf, " ");
sprintf(temp, "%d", n);
strcat(buf, temp);
if (datetime_is_negative(dt))
strcat(buf, " bc");
}
if (datetime_get_hour(dt, &n) == 0) {
if (*buf)
strcat(buf, " ");
sprintf(temp, "%02d", n);
strcat(buf, temp);
}
if (datetime_get_minute(dt, &n) == 0) {
if (*buf)
strcat(buf, ":");
sprintf(temp, "%02d", n);
strcat(buf, temp);
}
if (datetime_get_second(dt, &sec) == 0) {
if (*buf)
strcat(buf, ":");
if (datetime_get_fracsec(dt, &n) != 0)
n = 0;
sprintf(temp, "%02.*f", n, sec);
strcat(buf, temp);
}
if (datetime_get_timezone(dt, &n) == 0) {
int hour, minute;
if (*buf)
strcat(buf, " ");
datetime_decompose_timezone(n, &hour, &minute);
sprintf(temp, "%s%02d%02d", n < 0 ? "-" : "+", hour, minute);
strcat(buf, temp);
}
}
if (datetime_is_relative(dt)) {
if (datetime_is_negative(dt))
strcat(buf, "-");
if (datetime_get_year(dt, &n) == 0) {
if (*buf)
strcat(buf, " ");
sprintf(temp, "%d year%s", n, n == 1 ? "" : "s");
strcat(buf, temp);
}
if (datetime_get_month(dt, &n) == 0) {
if (*buf)
strcat(buf, " ");
sprintf(temp, "%d month%s", n, n == 1 ? "" : "s");
strcat(buf, temp);
}
if (datetime_get_day(dt, &n) == 0) {
if (*buf)
strcat(buf, " ");
sprintf(temp, "%d day%s", n, n == 1 ? "" : "s");
strcat(buf, temp);
}
if (datetime_get_hour(dt, &n) == 0) {
if (*buf)
strcat(buf, " ");
sprintf(temp, "%d hour%s", n, n == 1 ? "" : "s");
strcat(buf, temp);
}
if (datetime_get_minute(dt, &n) == 0) {
if (*buf)
strcat(buf, " ");
sprintf(temp, "%d minute%s", n, n == 1 ? "" : "s");
strcat(buf, temp);
}
if (datetime_get_second(dt, &sec) == 0) {
if (*buf)
strcat(buf, " ");
if (datetime_get_fracsec(dt, &n) != 0)
n = 0;
sprintf(temp, "%.*f second%s", n, sec,
(sec == 1.0 && n == 0) ? "" : "s");
strcat(buf, temp);
}
}
return 0;
}
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