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/*
* Copyright (C) 2018 "IoT.bzh"
* Author José Bollo <jose.bollo@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <time.h>
#include <string.h>
#include <stdio.h>
static const int SEC = 1;
static const int MIN = 60;
static const int HOUR = 60*60;
static const int DAY = 24*60*60;
static const int WEEK = 7*24*60*60;
static const int YEAR = 365*24*60*60;
time_t txt2exp(const char *txt)
{
time_t r, x;
/* infinite time */
if (!strcmp(txt, "always") || !strcmp(txt, "forever") || !strcmp(txt, "*"))
return 0;
/* parse */
r = time(NULL);
while(*txt) {
x = 0;
while('0' <= *txt && *txt <= '9')
x = 10 * x + (time_t)(*txt++ - '0');
switch(*txt) {
case 'y': r += x * YEAR; txt++; break;
case 'w': r += x * WEEK; txt++; break;
case 'd': r += x * DAY; txt++; break;
case 'h': r += x * HOUR; txt++; break;
case 'm': r += x * MIN; txt++; break;
case 's': txt++; /*@fallthrough@*/
case 0: r += x * SEC; break;
default: return -1;
}
}
return r;
}
size_t exp2txt(time_t expire, char *buffer, size_t buflen)
{
char b[100];
size_t l;
int n;
if (!expire)
strncpy(b, "forever", sizeof b);
else {
expire -= time(NULL);
n = 0;
#define ADD(C,U) \
if (expire >= U) { \
n += snprintf(&b[n], sizeof b - n, "%lld" #C, (long long)(expire / U)); \
expire %= U; \
}
ADD(y,YEAR)
ADD(w,WEEK)
ADD(d,DAY)
ADD(h,HOUR)
ADD(m,MIN)
ADD(s,SEC)
#undef ADD
}
l = strlen(b);
strncpy(buffer, b, buflen);
return l;
}
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