[src/trunk]: src/lib/libc/time make %Z and %z understand the same strings.

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/c85f07f4d151
branches:  trunk
changeset: 811474:c85f07f4d151
user:      christos <christos%NetBSD.org@localhost>
date:      Sat Oct 31 02:14:08 2015 +0000

description:
make %Z and %z understand the same strings.

diffstat:

 lib/libc/time/strptime.c |  90 +++++++++++++++++++++++------------------------
 1 files changed, 44 insertions(+), 46 deletions(-)

diffs (181 lines):

diff -r 48ff6d79f0f9 -r c85f07f4d151 lib/libc/time/strptime.c
--- a/lib/libc/time/strptime.c  Sat Oct 31 02:13:41 2015 +0000
+++ b/lib/libc/time/strptime.c  Sat Oct 31 02:14:08 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: strptime.c,v 1.56 2015/10/30 21:36:25 ginsbach Exp $   */
+/*     $NetBSD: strptime.c,v 1.57 2015/10/31 02:14:08 christos Exp $   */
 
 /*-
  * Copyright (c) 1997, 1998, 2005, 2008 The NetBSD Foundation, Inc.
@@ -31,7 +31,7 @@
 
 #include <sys/cdefs.h>
 #if defined(LIBC_SCCS) && !defined(lint)
-__RCSID("$NetBSD: strptime.c,v 1.56 2015/10/30 21:36:25 ginsbach Exp $");
+__RCSID("$NetBSD: strptime.c,v 1.57 2015/10/31 02:14:08 christos Exp $");
 #endif
 
 #include "namespace.h"
@@ -79,7 +79,6 @@
 #define HAVE_YEAR(s)           (s & S_YEAR)
 #define HAVE_HOUR(s)           (s & S_HOUR)
 
-static char gmt[] = { "GMT" };
 static char utc[] = { "UTC" };
 /* RFC-822/RFC-2822 */
 static const char * const nast[5] = {
@@ -117,19 +116,23 @@
 #define delim(p)       ((p) == '\0' || isspace((unsigned char)(p)))
 
 static int
-fromzone(const unsigned char **bp, struct tm *tm)
+fromzone(const unsigned char **bp, struct tm *tm, int mandatory)
 {
        timezone_t tz;
        char buf[512], *p;
+       const unsigned char *rp;
 
-       for (p = buf; !delim(**bp) && p < &buf[sizeof(buf) - 1]; (*bp)++)
-               *p++ = **bp;
+       for (p = buf, rp = *bp; !delim(*rp) && p < &buf[sizeof(buf) - 1]; rp++)
+               *p++ = *rp;
        *p = '\0';
 
+       if (mandatory)
+               *bp = rp;
        tz = tzalloc(buf);
        if (tz == NULL)
                return 0;
 
+       *bp = rp;
        tm->tm_isdst = 0;       /* XXX */
 #ifdef TM_GMTOFF
        tm->TM_GMTOFF = tzgetgmtoff(tz, tm->tm_isdst);
@@ -154,7 +157,7 @@
        unsigned char c;
        const unsigned char *bp, *ep, *zname;
        int alt_format, i, split_year = 0, neg = 0, state = 0,
-           day_offset = -1, week_offset = 0, offs;
+           day_offset = -1, week_offset = 0, offs, mandatory;
        const char *new_fmt;
 
        bp = (const u_char *)buf;
@@ -449,36 +452,9 @@
                        continue;
 
                case 'Z':
+               case 'z':
                        tzset();
-                       if (strncmp((const char *)bp, gmt, 3) == 0 ||
-                           strncmp((const char *)bp, utc, 3) == 0) {
-                               tm->tm_isdst = 0;
-#ifdef TM_GMTOFF
-                               tm->TM_GMTOFF = 0;
-#endif
-#ifdef TM_ZONE
-                               tm->TM_ZONE = gmt;
-#endif
-                               bp += 3;
-                       } else {
-                               ep = find_string(bp, &i,
-                                                (const char * const *)tzname,
-                                                 NULL, 2);
-                               if (ep != NULL) {
-                                       tm->tm_isdst = i;
-#ifdef TM_GMTOFF
-                                       tm->TM_GMTOFF = -timezone;
-#endif
-#ifdef TM_ZONE
-                                       tm->TM_ZONE = tzname[i];
-                                       bp = ep;
-#endif
-                               } else
-                                       (void)fromzone(&bp, tm);
-                       }
-                       continue;
-
-               case 'z':
+                       mandatory = c == 'z';
                        /*
                         * We recognize all ISO 8601 formats:
                         * Z    = Zulu time/UTC
@@ -498,8 +474,9 @@
                         * Note: J maybe used to denote non-nautical
                         *       local time
                         */
-                       while (isspace(*bp))
-                               bp++;
+                       if (mandatory)
+                               while (isspace(*bp))
+                                       bp++;
 
                        zname = bp;
                        switch (*bp++) {
@@ -597,14 +574,30 @@
                                        bp = ep;
                                        continue;
                                }
-
+                               /*
+                                * Our current timezone
+                                */
+                               ep = find_string(bp, &i,
+                                                (const char * const *)tzname,
+                                                 NULL, 2);
+                               if (ep != NULL) {
+                                       tm->tm_isdst = i;
+#ifdef TM_GMTOFF
+                                       tm->TM_GMTOFF = -timezone;
+#endif
+#ifdef TM_ZONE
+                                       tm->TM_ZONE = tzname[i];
+#endif
+                                       bp = ep;
+                                       continue;
+                               }
 loadzone:
                                /*
                                 * The hard way, load the zone!
                                 */
-                               if (fromzone(&bp, tm))
+                               if (fromzone(&bp, tm, mandatory))
                                        continue;
-                               return NULL;
+                               goto out;
                        }
                        offs = 0;
                        for (i = 0; i < 4; ) {
@@ -620,23 +613,28 @@
                                break;
                        }
                        if (isdigit(*bp))
-                               return NULL;
+                               goto out;
                        switch (i) {
                        case 2:
                                offs *= SECSPERHOUR;
                                break;
                        case 4:
                                i = offs % 100;
+                               offs /= 100;
                                if (i >= SECSPERMIN)
-                                       return NULL;
+                                       goto out;
                                /* Convert minutes into decimal */
-                               offs = (offs / 100) * SECSPERHOUR + i * SECSPERMIN;
+                               offs = offs * SECSPERHOUR + i * SECSPERMIN;
                                break;
                        default:
-                               return NULL;
+                       out:
+                               if (mandatory)
+                                       return NULL;
+                               bp = zname;
+                               continue;
                        }
                        if (offs >= (HOURSPERDAY * SECSPERHOUR))
-                               return NULL;
+                               goto out;
                        if (neg)
                                offs = -offs;
                        tm->tm_isdst = 0;       /* XXX */