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Eggert overflow mods

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SCCS-file: zdump.c
SCCS-SID: 7.76
This commit is contained in:
Arthur David Olson
2006-02-16 11:16:57 -05:00
committed by Paul Eggert
parent cbc9c9b577
commit 77ad572618
1 changed files with 18 additions and 11 deletions
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29
zdump.c
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@ -15,7 +15,7 @@ static char elsieid[] = "%W%";
#include "ctype.h" /* for isalpha et al. */
#ifndef isascii
#define isascii(x) 1
#endif
#endif /* !defined isascii */
#ifndef ZDUMP_LO_YEAR
#define ZDUMP_LO_YEAR (-500)
@ -418,14 +418,21 @@ _("%s: use of -v on system with floating time_t other than float or double\n"),
}
} else if (0 > (time_t) -1) {
/*
** time_t is signed.
** time_t is signed. Assume overflow wraps around.
*/
register time_t hibit;
time_t t = 0;
time_t t1 = 1;
for (hibit = 1; (hibit * 2) != 0; hibit *= 2)
continue;
absolute_min_time = hibit;
absolute_max_time = -(hibit + 1);
while (t < t1) {
t = t1;
t1 = 2 * t1 + 1;
}
absolute_max_time = t;
t = -t;
absolute_min_time = t - 1;
if (t < absolute_min_time)
absolute_min_time = t;
} else {
/*
** time_t is unsigned.
@ -470,12 +477,12 @@ const long y;
static time_t
#ifdef __STDC__
hunt(char *name, time_t lot, time_t hit)
#else /* !defined __STDC__ */
#else /* !defined __STDC__ */
hunt(name, lot, hit)
char * name;
time_t lot;
time_t hit;
#endif /* !defined __STDC__ */
#endif /* !defined __STDC__ */
{
time_t t;
long diff;
@ -547,12 +554,12 @@ struct tm * oldp;
static void
#ifdef __STDC__
show(char *zone, time_t t, int v)
#else /* !defined __STDC__ */
#else /* !defined __STDC__ */
show(zone, t, v)
char * zone;
time_t t;
int v;
#endif /* !defined __STDC__ */
#endif /* !defined __STDC__ */
{
register struct tm * tmp;