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[gnulib.git] / lib / posixtm.c

diff --git a/lib/posixtm.c b/lib/posixtm.c
index 49e239c..fff53f5 100644 (file)
--- a/lib/posixtm.c
+++ b/lib/posixtm.c
@@ -1,10 +1,12 @@
 /* Parse dates for touch and date.
-   Copyright (C) 1989, 1990, 1991, 1998, 2000-2003 Free Software Foundation Inc.
 
-   This program is free software; you can redistribute it and/or modify
+   Copyright (C) 1989, 1990, 1991, 1998, 2000, 2001, 2002, 2003, 2004,
+   2005, 2006, 2007 Free Software Foundation Inc.
+
+   This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -12,46 +14,32 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software Foundation,
-   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /* Yacc-based version written by Jim Kingdon and David MacKenzie.
    Rewritten by Jim Meyering.  */
 
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
 
-#include <stdbool.h>
+#include "posixtm.h"
 
 #include <stdio.h>
-#if HAVE_STDLIB_H
-# include <stdlib.h>
-#endif
+#include <stdlib.h>
 #include <sys/types.h>
-#if HAVE_STRING_H
-# include <string.h>
-#else
-# include <strings.h>
-#endif
+#include <string.h>
 
-#ifdef TM_IN_SYS_TIME
-# include <sys/time.h>
-#else
-# include <time.h>
+#if USE_UNLOCKED_IO
+# include "unlocked-io.h"
 #endif
 
-#include "posixtm.h"
-#include "unlocked-io.h"
-
 /* ISDIGIT differs from isdigit, as follows:
-   - Its arg may be any int or unsigned int; it need not be an unsigned char.
-   - It's guaranteed to evaluate its argument exactly once.
+   - Its arg may be any int or unsigned int; it need not be an unsigned char
+     or EOF.
    - It's typically faster.
    POSIX says that only '0' through '9' are digits.  Prefer ISDIGIT to
-   ISDIGIT_LOCALE unless it's important to use the locale's definition
+   isdigit unless it's important to use the locale's definition
    of `digit' even when the host does not conform to POSIX.  */
-#define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)
+#define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
 
 time_t mktime ();
 
@@ -63,8 +51,8 @@ time_t mktime ();
     (PDS_LEADING_YEAR | PDS_CENTURY | PDS_SECONDS)
 
   touch mmddhhmm[YY] FILE... (obsoleted by POSIX 1003.1-2001)
-    8 or 10 digits
-    (PDS_TRAILING_YEAR)
+    8 or 10 digits, YY (if present) must be in the range 69-99
+    (PDS_TRAILING_YEAR | PDS_PRE_2000)
 
   date mmddhhmm[[CC]YY]
     8, 10, or 12 digits
@@ -73,7 +61,7 @@ time_t mktime ();
 */
 
 static int
-year (struct tm *tm, const int *digit_pair, size_t n, int allow_century)
+year (struct tm *tm, const int *digit_pair, size_t n, unsigned int syntax_bits)
 {
   switch (n)
     {
@@ -83,11 +71,15 @@ year (struct tm *tm, const int *digit_pair, size_t n, int allow_century)
         POSIX requires that 00-68 be interpreted as 2000-2068,
         and that 69-99 be interpreted as 1969-1999.  */
       if (digit_pair[0] <= 68)
-       tm->tm_year += 100;
+       {
+         if (syntax_bits & PDS_PRE_2000)
+           return 1;
+         tm->tm_year += 100;
+       }
       break;
 
     case 2:
-      if (!allow_century)
+      if (! (syntax_bits & PDS_CENTURY))
        return 1;
       tm->tm_year = digit_pair[0] * 100 + digit_pair[1] - 1900;
       break;
@@ -119,7 +111,7 @@ posix_time_parse (struct tm *tm, const char *s, unsigned int syntax_bits)
   const char *dot = NULL;
   int pair[6];
   int *p;
-  unsigned int i;
+  size_t i;
 
   size_t s_len = strlen (s);
   size_t len = (((syntax_bits & PDS_SECONDS) && (dot = strchr (s, '.')))
@@ -149,7 +141,7 @@ posix_time_parse (struct tm *tm, const char *s, unsigned int syntax_bits)
   p = pair;
   if (syntax_bits & PDS_LEADING_YEAR)
     {
-      if (year (tm, p, len - 4, syntax_bits & PDS_CENTURY))
+      if (year (tm, p, len - 4, syntax_bits))
        return 1;
       p += len - 4;
       len = 4;
@@ -165,7 +157,7 @@ posix_time_parse (struct tm *tm, const char *s, unsigned int syntax_bits)
   /* Handle any trailing year.  */
   if (syntax_bits & PDS_TRAILING_YEAR)
     {
-      if (year (tm, p, len, syntax_bits & PDS_CENTURY))
+      if (year (tm, p, len, syntax_bits))
        return 1;
     }
 
@@ -194,7 +186,15 @@ posix_time_parse (struct tm *tm, const char *s, unsigned int syntax_bits)
 bool
 posixtime (time_t *p, const char *s, unsigned int syntax_bits)
 {
-  struct tm tm0;
+  struct tm tm0
+#ifdef lint
+  /* Placate gcc-4's -Wuninitialized.
+     posix_time_parse fails to set all of tm0 only when it returns
+     nonzero (due to year() returning nonzero), and in that case,
+     this code doesn't use the tm0 at all.  */
+    = { 0, }
+#endif
+    ;
   struct tm tm1;
   struct tm const *tm;
   time_t t;
@@ -294,7 +294,7 @@ END-DATA
 # define MAX_BUFF_LEN 1024
 
 int
-main ()
+main (void)
 {
   char buff[MAX_BUFF_LEN + 1];
 
@@ -310,7 +310,7 @@ main ()
        {
          printf ("%-15s %2u ", time_str, syntax_bits);
          if (posixtime (&t, time_str, syntax_bits))
-           printf ("%12ld %s", (long) t, ctime (&t));
+           printf ("%12ld %s", (long int) t, ctime (&t));
          else
            printf ("%12s %s", "*", "*\n");
        }
@@ -322,6 +322,6 @@ main ()
 \f
 /*
 Local Variables:
-compile-command: "gcc -DTEST_POSIXTIME -DHAVE_CONFIG_H -I.. -g -O -Wall -W posixtm.c"
+compile-command: "gcc -DTEST_POSIXTIME -g -O -Wall -W posixtm.c"
 End:
 */