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Properly check for miliseconds during screen update

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This removes undefined behavior in the previous code by properly
checking for miliseconds (actually typing proper names, not abusing
pointer arithmetics).
This commit is contained in:
Konrad Borowski 2014-05-01 11:00:13 +02:00
parent dd47da92f5
commit 77bc4c5725
2 changed files with 12 additions and 16 deletions
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5
configure.ac
View file

@ -396,6 +396,11 @@ AC_CHECK_HEADER(
[AC_MSG_ERROR([Could not find the header regex.h, needed to build fish])]
)
#
# Detect nanoseconds fields in struct stat
#
AC_CHECK_MEMBERS([struct stat.st_mtimespec.tv_nsec])
AC_CHECK_MEMBERS([struct stat.st_mtim.tv_nsec])
#
# On some platforms (Solaris 10) adding -std=c99 in turn requires that

23
screen.cpp
View file

@ -379,17 +379,6 @@ static size_t calc_prompt_lines(const wcstring &prompt)
}
return result;
}
/**
Test if there is space between the time fields of struct stat to
use for sub second information. If so, we assume this space
contains the desired information.
*/
static int room_for_usec(struct stat *st)
{
int res = ((&(st->st_atime) + 2) == &(st->st_mtime) &&
(&(st->st_atime) + 4) == &(st->st_ctime));
return res;
}
/**
Stat stdout and stderr and save result.
@ -456,11 +445,13 @@ static void s_check_status(screen_t *s)
int changed = (s->prev_buff_1.st_mtime != s->post_buff_1.st_mtime) ||
(s->prev_buff_2.st_mtime != s->post_buff_2.st_mtime);
if (room_for_usec(&s->post_buff_1))
{
changed = changed || ((&s->prev_buff_1.st_mtime)[1] != (&s->post_buff_1.st_mtime)[1]) ||
((&s->prev_buff_2.st_mtime)[1] != (&s->post_buff_2.st_mtime)[1]);
}
#if defined HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC
changed = changed || s->prev_buff_1.st_mtimespec.tv_nsec != s->post_buff_1.st_mtimespec.tv_nsec ||
s->prev_buff_2.st_mtimespec.tv_nsec != s->post_buff_2.st_mtimespec.tv_nsec;
#elif defined HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC
changed = changed || s->prev_buff_1.st_mtim.tv_nsec != s->post_buff_1.st_mtim.tv_nsec ||
s->prev_buff_2.st_mtim.tv_nsec != s->post_buff_2.st_mtim.tv_nsec;
#endif
if (changed)
{