1 files changed, 70 insertions, 0 deletions
diff --git a/gnu/packages/patches/ttfautohint-source-date-epoch.patch b/gnu/packages/patches/ttfautohint-source-date-epoch.patch
new file mode 100644
index 0000000000..e42fdbf6b0
--- /dev/null
+++ b/gnu/packages/patches/ttfautohint-source-date-epoch.patch
@@ -0,0 +1,70 @@
+Honour an external definition of SOURCE_DATE_EPOCH when updating the embedded
+modification date in TTF/TTC files.
+
+--- a/lib/tatime.c
++++ b/lib/tatime.c
+@@ -15,6 +15,8 @@
+ 
+ #include <time.h>
+ #include <stdint.h>
++#include <errno.h>
++#include <limits.h>
+ 
+ #include "ta.h"
+ 
+@@ -27,12 +29,51 @@ TA_get_current_time(FT_ULong* high,
+ {
+   /* there have been 24107 days between January 1st, 1904 (the epoch of */
+   /* OpenType), and January 1st, 1970 (the epoch of the `time' function) */
+-  TA_ULongLong seconds_to_1970 = 24107 * 24 * 60 * 60;
+-  TA_ULongLong seconds_to_today = seconds_to_1970 + (TA_ULongLong)time(NULL);
++  const TA_ULongLong seconds_to_1970 = 24107 * 24 * 60 * 60;
++  TA_ULongLong seconds_to_build;
+ 
++  time_t now;
++  char *source_date_epoch, *endptr;
++  TA_ULongLong epoch;
++  source_date_epoch = getenv("SOURCE_DATE_EPOCH");
++  if (source_date_epoch) {
++    errno = 0;
++    epoch = strtoull(source_date_epoch, &endptr, 10);
++    if ((errno == ERANGE && (epoch == ULLONG_MAX || epoch == 0))
++	|| (errno != 0 && epoch == 0)) {
++      fprintf(stderr,
++	      "Environment variable $SOURCE_DATE_EPOCH: strtoull: %s\n",
++	      strerror(errno));
++      exit(EXIT_FAILURE);
++    }
++    if (endptr == source_date_epoch) {
++      fprintf(stderr,
++	      "Environment variable $SOURCE_DATE_EPOCH: No digits were found: %s\n",
++	      endptr);
++      exit(EXIT_FAILURE);
++    }
++    if (*endptr != '\0') {
++      fprintf(stderr,
++	      "Environment variable $SOURCE_DATE_EPOCH: Trailing garbage: %s\n",
++	      endptr);
++      exit(EXIT_FAILURE);
++    }
++    if (epoch > ULONG_MAX) {
++      fprintf(stderr,
++	      "Environment variable $SOURCE_DATE_EPOCH: value must be smaller "
++	      "than or equal to: %lu but was found to be: %llu \n",
++	      ULONG_MAX, epoch);
++      exit(EXIT_FAILURE);
++    }
++    now = epoch;
++  } else {
++    now = time(NULL);
++  }
+ 
+-  *high = (FT_ULong)(seconds_to_today >> 32);
+-  *low = (FT_ULong)seconds_to_today;
++  seconds_to_build = seconds_to_1970 + (TA_ULongLong)now;
++
++  *high = (FT_ULong)(seconds_to_build >> 32);
++  *low = (FT_ULong)seconds_to_build;
+ }
+ 
+ /* end of tatime.c */