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[2/2] time: in strptime(), make %z accept [+-]HH:MM tz [BZ #17887]

Message ID 1442393243-30956-2-git-send-email-Vincent.Bernat@exoscale.ch
State Superseded
Delegated to: Mike Frysinger
Headers show

Commit Message

Vincent Bernat Sept. 16, 2015, 8:47 a.m. UTC
From: Vincent Bernat <vincent@bernat.im>

In ISO 8601, +03:30 is a valid time zone. Currently, strptime() only
parses it as a 2-digit time zone an believes this is +03:00. This change
makes it accept a single colon.

This fixes BZ #17887.

2015-09-04  Vincent Bernat  <vincent@bernat.im>

	[BZ #17887]
	* time/strptime_l.c (__strptime_internal): Make %z accept
	[+-]HH:MM time zones.
---
 time/strptime_l.c    | 10 +++++++---
 time/tst-strptime2.c | 24 +++++++++++++++++++-----
 2 files changed, 26 insertions(+), 8 deletions(-)

Comments

Mike Frysinger Sept. 16, 2015, 5:19 p.m. UTC | #1
On 16 Sep 2015 10:47, Vincent Bernat wrote:
> --- a/time/strptime_l.c
> +++ b/time/strptime_l.c
>
> +		if (*rp == ':' && n == 2 && isdigit(*(rp + 1)))

needs a space: isdigit (...)

> --- a/time/tst-strptime2.c
> +++ b/time/tst-strptime2.c
>
> -  snprintf (buf + i, ndigits + 1, "%04u", hhmm);
> +  snprintf (buf + i,
> +	    (colon && ndigits >= 2) ? ndigits + 2 : ndigits + 1,
> +	    "%02u%s%02u", hh, colon ? ":" : "", mm);

i think the inlining of |colon| makes it hard to read.  just use an if
statement to do it:
  if (colon)
    snprintf (buf + i, ndigits + 2, "%02u:%02u", hh, mm);
  else
    snprintf (buf + i, ndigits + 1, "%04u", hhmm);
-mike
diff mbox

Patch

diff --git a/time/strptime_l.c b/time/strptime_l.c
index 989edd6144e6..179ae0e210b0 100644
--- a/time/strptime_l.c
+++ b/time/strptime_l.c
@@ -749,9 +749,11 @@  __strptime_internal (rp, fmt, tmp, statep LOCALE_PARAM)
 	    rp++;
 	  break;
 	case 'z':
-	  /* We recognize three formats: if two digits are given, these
-	     specify hours.  If fours digits are used, minutes are
-	     also specified.  'Z' is equivalent to +0000.  */
+	  /* We recognize four formats:
+	     1. Two digits specify hours.
+	     2. Four digits specify hours and minutes.
+	     3. Two digits, ':', and two digits specify hours and minutes.
+	     4. 'Z' is equivalent to +0000.  */
 	  {
 	    val = 0;
 	    while (ISSPACE (*rp))
@@ -770,6 +772,8 @@  __strptime_internal (rp, fmt, tmp, statep LOCALE_PARAM)
 	      {
 		val = val * 10 + *rp++ - '0';
 		++n;
+		if (*rp == ':' && n == 2 && isdigit(*(rp + 1)))
+		  ++rp;
 	      }
 	    if (n == 2)
 	      val *= 100;
diff --git a/time/tst-strptime2.c b/time/tst-strptime2.c
index cfb7d70c4cc2..0036a99c9390 100644
--- a/time/tst-strptime2.c
+++ b/time/tst-strptime2.c
@@ -34,7 +34,8 @@  static bool verbose;
    Note that a valid timezone string contains the following fields:
      Sign field consisting of a '+' or '-' sign,
      Hours field in two decimal digits, and
-     optional Minutes field in two decimal digits.
+     optional Minutes field in two decimal digits. Optionally,
+     a ':' is used to seperate hours and minutes.
 
    This function may write test strings with minutes values outside
    the valid range 00-59.  These are invalid strings and useful for
@@ -55,7 +56,7 @@  static bool verbose;
    range of 00 to 59.  */
 
 static long int
-mkbuf (char *buf, bool neg, unsigned int hhmm, size_t ndigits)
+mkbuf (char *buf, bool neg, bool colon, unsigned int hhmm, size_t ndigits)
 {
   const int mm_max = 59;
   char sign = neg ? '-' : '+';
@@ -65,7 +66,9 @@  mkbuf (char *buf, bool neg, unsigned int hhmm, size_t ndigits)
   long int expect = LONG_MAX;
 
   i = sprintf (buf, "%s %c", dummy_string, sign);
-  snprintf (buf + i, ndigits + 1, "%04u", hhmm);
+  snprintf (buf + i,
+	    (colon && ndigits >= 2) ? ndigits + 2 : ndigits + 1,
+	    "%02u%s%02u", hh, colon ? ":" : "", mm);
 
   if (mm <= mm_max && (ndigits == 2 || ndigits == 4))
     {
@@ -176,11 +179,22 @@  do_test (void)
       {
 	/* Test both positive and negative signs.  */
 
-	expect = mkbuf (buf, false, hhmm, ndigits);
+	expect = mkbuf (buf, false, false, hhmm, ndigits);
 	result |= compare (buf, expect, nresult);
 
-	expect = mkbuf (buf, true, hhmm, ndigits);
+	expect = mkbuf (buf, true, false, hhmm, ndigits);
 	result |= compare (buf, expect, nresult);
+
+	/* Test with colon as well.  */
+
+	if (ndigits >= 3)
+	  {
+	    expect = mkbuf (buf, false, true, hhmm, ndigits);
+	    result |= compare (buf, expect, nresult);
+
+	    expect = mkbuf (buf, true, true, hhmm, ndigits);
+	    result |= compare (buf, expect, nresult);
+	  }
       }
 
   if (result > 0 || verbose)