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authorRich Felker <dalias@aerifal.cx>2019-08-02 15:52:42 -0400
committerRich Felker <dalias@aerifal.cx>2019-11-02 18:30:56 -0400
commitc0450320940c8c45f3847f2d0a22c0ebc545b291 (patch)
tree3403c819f3fb9ddc96e1c0136b8807a0aa7eb582 /compat/time32/mktime32.c
parent0961bb94162896d358937e4979e5830f39818920 (diff)
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add time32 ABI compat shims, compat source tree
these files provide the symbols for the traditional 32-bit time_t ABI
on existing 32-bit archs by wrapping the real, internal versions of
the corresponding functions, which always work with 64-bit time_t.
they are written to be as agnostic as possible to the implementation
details of the real functions, so that they can be written once and
mostly forgotten, but they are aware of details of the old (and
sometimes new) ABI, which is okay since ABI is fixed and cannot
change.

a new compat tree is added, separate from src, which the Makefile does
not see or use now, but which archs will be able to add to the build
process. we could also consider moving other things that are compat
shims here, like functions which are purely for glibc-ABI-compat, with
the goal of making it optional or just cleaning up the main src tree
to make the distinction between actual implementation/API files and
ABI-compat shims clear.
Diffstat (limited to 'compat/time32/mktime32.c')
-rw-r--r--compat/time32/mktime32.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/compat/time32/mktime32.c b/compat/time32/mktime32.c
new file mode 100644
index 00000000..e6f15d51
--- /dev/null
+++ b/compat/time32/mktime32.c
@@ -0,0 +1,16 @@
+#include "time32.h"
+#include <time.h>
+#include <errno.h>
+#include <stdint.h>
+
+time32_t __mktime32(struct tm *tm)
+{
+	struct tm tmp = *tm;
+	time_t t = mktime(&tmp);
+	if (t < INT32_MIN || t > INT32_MAX) {
+		errno = EOVERFLOW;
+		return -1;
+	}
+	*tm = tmp;
+	return t;
+}