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authorJoseph Myers <joseph@codesourcery.com>2012-11-09 21:20:57 +0000
committerJoseph Myers <joseph@codesourcery.com>2012-11-09 21:20:57 +0000
commit92e4b6a92716f8b2457376291171a6330d072b0d (patch)
tree376786acd464b7ec8e556b2336fd66d73c28f956 /timezone/zdump.c
parent9bde902c768916daeec9983dcc0c8c420cd3895d (diff)
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Update tzcode to 2012i.
Diffstat (limited to 'timezone/zdump.c')
-rw-r--r--timezone/zdump.c131
1 files changed, 59 insertions, 72 deletions
diff --git a/timezone/zdump.c b/timezone/zdump.c
index 67bed06..805267d 100644
--- a/timezone/zdump.c
+++ b/timezone/zdump.c
@@ -3,7 +3,7 @@
** 2009-05-17 by Arthur David Olson.
*/
-static char elsieid[] = "@(#)zdump.c 8.10";
+#include "version.h"
/*
** This code has been made independent of the rest of the time
@@ -17,6 +17,7 @@ static char elsieid[] = "@(#)zdump.c 8.10";
#include "time.h" /* for struct tm */
#include "stdlib.h" /* for exit, malloc, atoi */
#include "float.h" /* for FLT_MAX and DBL_MAX */
+#include "limits.h" /* for CHAR_BIT, LLONG_MAX */
#include "ctype.h" /* for isalpha et al. */
#ifndef isascii
#define isascii(x) 1
@@ -119,6 +120,12 @@ static char elsieid[] = "@(#)zdump.c 8.10";
#endif /* !defined GNUC_or_lint */
#endif /* !defined INITIALIZE */
+#if 2 < __GNUC__ || (__GNUC__ == 2 && 96 <= __GNUC_MINOR__)
+# define ATTRIBUTE_PURE __attribute__ ((__pure__))
+#else
+# define ATTRIBUTE_PURE /* empty */
+#endif
+
/*
** For the benefit of GNU folk...
** `_(MSGID)' uses the current locale's message library string for MSGID.
@@ -144,28 +151,54 @@ extern char * optarg;
extern int optind;
extern char * tzname[2];
-static time_t absolute_min_time;
-static time_t absolute_max_time;
+/* The minimum and maximum finite time values. Shift 'long long' or
+ 'long' instead of 'time_t'; this avoids compile-time errors when
+ time_t is floating-point. In practice, 'long long' is wide enough. */
+static time_t const absolute_min_time =
+ ((time_t) 0.5 == 0.5
+ ? (sizeof (time_t) == sizeof (float) ? (time_t) -FLT_MAX
+ : sizeof (time_t) == sizeof (double) ? (time_t) -DBL_MAX
+ : sizeof (time_t) == sizeof (long double) ? (time_t) -LDBL_MAX
+ : 0)
+ : (time_t) -1 < 0
+#ifdef LLONG_MAX
+ ? (time_t) ((long long) -1 << (CHAR_BIT * sizeof (time_t) - 1))
+#else
+ ? (time_t) ((long) -1 << (CHAR_BIT * sizeof (time_t) - 1))
+#endif
+ : 0);
+static time_t const absolute_max_time =
+ ((time_t) 0.5 == 0.5
+ ? (sizeof (time_t) == sizeof (float) ? (time_t) FLT_MAX
+ : sizeof (time_t) == sizeof (double) ? (time_t) DBL_MAX
+ : sizeof (time_t) == sizeof (long double) ? (time_t) LDBL_MAX
+ : -1)
+ : (time_t) -1 < 0
+#ifdef LLONG_MAX
+ ? (time_t) (- (~ 0 < 0) - ((long long) -1 << (CHAR_BIT * sizeof (time_t) - 1)))
+#else
+ ? (time_t) (- (~ 0 < 0) - ((long) -1 << (CHAR_BIT * sizeof (time_t) - 1)))
+#endif
+ : (time_t) -1);
static size_t longest;
static char * progname;
static int warned;
static char * abbr(struct tm * tmp);
static void abbrok(const char * abbrp, const char * zone);
-static long delta(struct tm * newp, struct tm * oldp);
+static long delta(struct tm * newp, struct tm * oldp) ATTRIBUTE_PURE;
static void dumptime(const struct tm * tmp);
static time_t hunt(char * name, time_t lot, time_t hit);
-static void setabsolutes(void);
+static void checkabsolutes(void);
static void show(char * zone, time_t t, int v);
static const char * tformat(void);
-static time_t yeartot(long y);
+static time_t yeartot(long y) ATTRIBUTE_PURE;
#ifndef TYPECHECK
#define my_localtime localtime
#else /* !defined TYPECHECK */
static struct tm *
-my_localtime(tp)
-time_t * tp;
+my_localtime(time_t *tp)
{
register struct tm * tmp;
@@ -198,12 +231,10 @@ time_t * tp;
#endif /* !defined TYPECHECK */
static void
-abbrok(abbrp, zone)
-const char * const abbrp;
-const char * const zone;
+abbrok(const char *const abbrp, const char *const zone)
{
register const char * cp;
- register char * wp;
+ register const char * wp;
if (warned)
return;
@@ -236,9 +267,7 @@ const char * const zone;
}
static void
-usage(stream, status)
-FILE * const stream;
-const int status;
+usage(FILE * const stream, const int status)
{
(void) fprintf(stream,
_("%s: usage is %s [ --version ] [ --help ] [ -v ] [ -c [loyear,]hiyear ] zonename ...\n\
@@ -249,9 +278,7 @@ Report bugs to tz@elsie.nci.nih.gov.\n"),
}
int
-main(argc, argv)
-int argc;
-char * argv[];
+main(int argc, char *argv[])
{
register int i;
register int c;
@@ -282,7 +309,7 @@ char * argv[];
progname = argv[0];
for (i = 1; i < argc; ++i)
if (strcmp(argv[i], "--version") == 0) {
- (void) printf("%s\n", elsieid);
+ (void) printf("%s\n", TZVERSION);
exit(EXIT_SUCCESS);
} else if (strcmp(argv[i], "--help") == 0) {
usage(stdout, EXIT_SUCCESS);
@@ -315,7 +342,7 @@ char * argv[];
exit(EXIT_FAILURE);
}
}
- setabsolutes();
+ checkabsolutes();
cutlotime = yeartot(cutloyear);
cuthitime = yeartot(cuthiyear);
}
@@ -330,10 +357,9 @@ char * argv[];
for (i = 0; environ[i] != NULL; ++i)
continue;
- fakeenv = (char **) malloc((size_t) ((i + 2) *
- sizeof *fakeenv));
- if (fakeenv == NULL ||
- (fakeenv[0] = (char *) malloc(longest + 4)) == NULL) {
+ fakeenv = malloc((i + 2) * sizeof *fakeenv);
+ if (fakeenv == NULL
+ || (fakeenv[0] = malloc(longest + 4)) == NULL) {
(void) perror(progname);
exit(EXIT_FAILURE);
}
@@ -406,53 +432,18 @@ char * argv[];
}
static void
-setabsolutes(void)
+checkabsolutes(void)
{
- if (0.5 == (time_t) 0.5) {
- /*
- ** time_t is floating.
- */
- if (sizeof (time_t) == sizeof (float)) {
- absolute_min_time = (time_t) -FLT_MAX;
- absolute_max_time = (time_t) FLT_MAX;
- } else if (sizeof (time_t) == sizeof (double)) {
- absolute_min_time = (time_t) -DBL_MAX;
- absolute_max_time = (time_t) DBL_MAX;
- } else {
- (void) fprintf(stderr,
+ if (absolute_max_time < absolute_min_time) {
+ (void) fprintf(stderr,
_("%s: use of -v on system with floating time_t other than float or double\n"),
- progname);
- exit(EXIT_FAILURE);
- }
- } else if (0 > (time_t) -1) {
- /*
- ** time_t is signed. Assume overflow wraps around.
- */
- time_t t = 0;
- time_t t1 = 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.
- */
- absolute_min_time = 0;
- absolute_max_time = absolute_min_time - 1;
+ progname);
+ exit(EXIT_FAILURE);
}
}
static time_t
-yeartot(y)
-const long y;
+yeartot(const long y)
{
register long myy;
register long seconds;
@@ -530,9 +521,7 @@ hunt(char *name, time_t lot, time_t hit)
*/
static long
-delta(newp, oldp)
-struct tm * newp;
-struct tm * oldp;
+delta(struct tm * newp, struct tm *oldp)
{
register long result;
register int tmy;
@@ -586,8 +575,7 @@ show(char *zone, time_t t, int v)
}
static char *
-abbr(tmp)
-struct tm * tmp;
+abbr(struct tm *tmp)
{
register char * result;
static char nada;
@@ -626,8 +614,7 @@ tformat(void)
}
static void
-dumptime(timeptr)
-register const struct tm * timeptr;
+dumptime(register const struct tm *timeptr)
{
static const char wday_name[][3] = {
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"