71 lines
2.1 KiB
Diff
71 lines
2.1 KiB
Diff
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Honour an external definition of SOURCE_DATE_EPOCH when updating the embedded
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modification date in TTF/TTC files.
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--- a/lib/tatime.c
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+++ b/lib/tatime.c
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@@ -15,6 +15,8 @@
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#include <time.h>
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#include <stdint.h>
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+#include <errno.h>
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+#include <limits.h>
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#include "ta.h"
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@@ -27,12 +29,51 @@ TA_get_current_time(FT_ULong* high,
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{
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/* there have been 24107 days between January 1st, 1904 (the epoch of */
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/* OpenType), and January 1st, 1970 (the epoch of the `time' function) */
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- TA_ULongLong seconds_to_1970 = 24107 * 24 * 60 * 60;
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- TA_ULongLong seconds_to_today = seconds_to_1970 + (TA_ULongLong)time(NULL);
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+ const TA_ULongLong seconds_to_1970 = 24107 * 24 * 60 * 60;
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+ TA_ULongLong seconds_to_build;
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+ time_t now;
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+ char *source_date_epoch, *endptr;
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+ TA_ULongLong epoch;
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+ source_date_epoch = getenv("SOURCE_DATE_EPOCH");
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+ if (source_date_epoch) {
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+ errno = 0;
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+ epoch = strtoull(source_date_epoch, &endptr, 10);
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+ if ((errno == ERANGE && (epoch == ULLONG_MAX || epoch == 0))
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+ || (errno != 0 && epoch == 0)) {
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+ fprintf(stderr,
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+ "Environment variable $SOURCE_DATE_EPOCH: strtoull: %s\n",
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+ strerror(errno));
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+ exit(EXIT_FAILURE);
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+ }
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+ if (endptr == source_date_epoch) {
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+ fprintf(stderr,
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+ "Environment variable $SOURCE_DATE_EPOCH: No digits were found: %s\n",
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+ endptr);
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+ exit(EXIT_FAILURE);
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+ }
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+ if (*endptr != '\0') {
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+ fprintf(stderr,
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+ "Environment variable $SOURCE_DATE_EPOCH: Trailing garbage: %s\n",
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+ endptr);
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+ exit(EXIT_FAILURE);
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+ }
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+ if (epoch > ULONG_MAX) {
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+ fprintf(stderr,
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+ "Environment variable $SOURCE_DATE_EPOCH: value must be smaller "
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+ "than or equal to: %lu but was found to be: %llu \n",
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+ ULONG_MAX, epoch);
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+ exit(EXIT_FAILURE);
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+ }
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+ now = epoch;
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+ } else {
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+ now = time(NULL);
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+ }
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- *high = (FT_ULong)(seconds_to_today >> 32);
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- *low = (FT_ULong)seconds_to_today;
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+ seconds_to_build = seconds_to_1970 + (TA_ULongLong)now;
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+
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+ *high = (FT_ULong)(seconds_to_build >> 32);
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+ *low = (FT_ULong)seconds_to_build;
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}
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/* end of tatime.c */
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