Document more consise C code for parsing SDE

and document that stdlib.h is required for getenv
parent b7a0beef
......@@ -154,6 +154,7 @@ endif ()
```
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
struct tm *build_time;
time_t now;
......@@ -189,6 +190,18 @@ if (source_date_epoch) {
build_time = gmtime(&now);
```
If you want less verbose code and are happy with the assumtion, that the variable will contain a correct, positive integer in the `time_t` range, you can use
```
#include <stdlib.h>
time_t now;
char *source_date_epoch;
if ((source_date_epoch = getenv("SOURCE_DATE_EPOCH")) == NULL ||
(now = (time_t)strtoll(source_date_epoch, NULL, 10)) <= 0)
time(&now);
```
### C++
```
......
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