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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* source_date_epoch.h
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "util.h"
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
uint32_t get_source_date_epoch(void)
{
const char *str, *ptr;
uint32_t x, tval = 0;
str = getenv("SOURCE_DATE_EPOCH");
if (str == NULL || *str == '\0')
return 0;
for (ptr = str; *ptr != '\0'; ++ptr) {
if (!isdigit(*ptr))
goto fail_nan;
x = (*ptr) - '0';
if (tval > (UINT32_MAX - x) / 10)
goto fail_ov;
tval = tval * 10 + x;
}
return tval;
fail_ov:
fprintf(stderr, "WARNING: SOURCE_DATE_EPOCH=%s does not fit into "
"32 bit integer\n", str);
return 0;
fail_nan:
fprintf(stderr, "WARNING: SOURCE_DATE_EPOCH=%s is not a positive "
"number\n", str);
return 0;
}
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