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

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See <http://bugs.gnu.org/11825#29>.
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Paul Eggert 2012-07-08 16:00:38 -07:00
parent 0ccb0b0983
commit ab531b66f3
2 changed files with 7 additions and 1 deletions
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src/ChangeLog
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@ -1,3 +1,8 @@
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

3
src/systime.h
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@ -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))