Commit ab531b66 authored by Paul Eggert's avatar Paul Eggert

* systime.h (EMACS_SUB_TIME): Clarify behavior with unsigned time_t.

See <http://bugs.gnu.org/11825#29>.
parent 0ccb0b09
2012-07-08 Paul Eggert <eggert@cs.ucla.edu>
* systime.h (EMACS_SUB_TIME): Clarify behavior with unsigned time_t.
See <http://bugs.gnu.org/11825#29>.
2012-07-08 Eli Zaretskii <eliz@gnu.org>
* xdisp.c (fill_glyphless_glyph_string): If the face of the glyph
......
......@@ -80,7 +80,8 @@ typedef unsigned long Time;
#define EMACS_GET_TIME(time) gettime (&(time))
/* Put into DEST the result of adding SRC1 to SRC2, or of subtracting
SRC2 from SRC1. On overflow, store an extremal value. */
SRC2 from SRC1. On overflow, store an extremal value: ergo, if
time_t is unsigned, return 0 if the true answer would be negative. */
#define EMACS_ADD_TIME(dest, src1, src2) ((dest) = timespec_add (src1, src2))
#define EMACS_SUB_TIME(dest, src1, src2) ((dest) = timespec_sub (src1, src2))
......
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