[PATCH 3/3] libc: Replace one letter member names in __tzrule_struct

["Torbjörn SVENSSON" <torbjorn.svensson@st.com>]

As discussed in GCC bug 97088
(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97088), parameters in
prototypes of library functions should use reserved names, or no name
at all.

This patch replaces 'm', 'n', 'd' and 's' members in
'struct __tzrule_struct' to avoid possible clashes with user code in
case someone uses before including Newlib's time.h (or uses some
other conflicting definition)

Signed-off-by: Torbjörn SVENSSON <torbjorn.svensson@st.com>
---
 newlib/libc/include/time.h       |  8 ++++----
 newlib/libc/time/tzcalc_limits.c | 14 +++++++-------
 newlib/libc/time/tzset_r.c       | 22 +++++++++++-----------
 3 files changed, 22 insertions(+), 22 deletions(-)

diff --git a/newlib/libc/include/time.h b/newlib/libc/include/time.h
index 3031590b4..6a540537f 100644
--- a/newlib/libc/include/time.h
+++ b/newlib/libc/include/time.h
@@ -105,10 +105,10 @@ void      _tzset_r 	(struct _reent *);
 typedef struct __tzrule_struct
 {
   char ch;
-  int m;
-  int n;
-  int d;
-  int s;
+  int month; /* Month of year if ch=M */
+  int week; /* Week of month if ch=M */
+  int day; /* Day of week if ch=M, day of year if ch=J or ch=D */
+  int secs; /* Time of day in seconds */
   time_t change;
   long offset; /* Match type of _timezone. */
 } __tzrule_type;
diff --git a/newlib/libc/time/tzcalc_limits.c b/newlib/libc/time/tzcalc_limits.c
index e0ea6549c..b2163ed3d 100644
--- a/newlib/libc/time/tzcalc_limits.c
+++ b/newlib/libc/time/tzcalc_limits.c
@@ -34,13 +34,13 @@ __tzcalc_limits (int year)
       if (tz->__tzrule[i].ch == 'J')
 	{
 	  /* The Julian day n (1 <= n <= 365). */
-	  days = year_days + tz->__tzrule[i].d +
-	    (isleap(year) && tz->__tzrule[i].d >= 60);
+	  days = year_days + tz->__tzrule[i].day +
+	    (isleap(year) && tz->__tzrule[i].day >= 60);
 	  /* Convert to yday */
 	  --days;
 	}
       else if (tz->__tzrule[i].ch == 'D')
-	days = year_days + tz->__tzrule[i].d;
+	days = year_days + tz->__tzrule[i].day;
       else
 	{
 	  const int yleap = isleap(year);
@@ -49,15 +49,15 @@ __tzcalc_limits (int year)
 
 	  days = year_days;
 
-	  for (j = 1; j < tz->__tzrule[i].m; ++j)
+	  for (j = 1; j < tz->__tzrule[i].month; ++j)
 	    days += ip[j-1];
 
 	  m_wday = (EPOCH_WDAY + days) % DAYSPERWEEK;
 
-	  wday_diff = tz->__tzrule[i].d - m_wday;
+	  wday_diff = tz->__tzrule[i].day - m_wday;
 	  if (wday_diff < 0)
 	    wday_diff += DAYSPERWEEK;
-	  m_day = (tz->__tzrule[i].n - 1) * DAYSPERWEEK + wday_diff;
+	  m_day = (tz->__tzrule[i].week - 1) * DAYSPERWEEK + wday_diff;
 
 	  while (m_day >= ip[j-1])
 	    m_day -= DAYSPERWEEK;
@@ -67,7 +67,7 @@ __tzcalc_limits (int year)
 
       /* store the change-over time in GMT form by adding offset */
       tz->__tzrule[i].change = days * SECSPERDAY +
-      tz->__tzrule[i].s + tz->__tzrule[i].offset;
+      tz->__tzrule[i].secs + tz->__tzrule[i].offset;
     }
 
   tz->__tznorth = (tz->__tzrule[0].change < tz->__tzrule[1].change);
diff --git a/newlib/libc/time/tzset_r.c b/newlib/libc/time/tzset_r.c
index 9e0cf834b..7117b51e6 100644
--- a/newlib/libc/time/tzset_r.c
+++ b/newlib/libc/time/tzset_r.c
@@ -115,9 +115,9 @@ _tzset_unlocked_r (struct _reent *reent_ptr)
 	    return;
 	  
 	  tz->__tzrule[i].ch = 'M';
-	  tz->__tzrule[i].m = m;
-	  tz->__tzrule[i].n = w;
-	  tz->__tzrule[i].d = d;
+	  tz->__tzrule[i].month = m;
+	  tz->__tzrule[i].week = w;
+	  tz->__tzrule[i].day = d;
 	  
 	  tzenv += n;
 	}
@@ -142,22 +142,22 @@ _tzset_unlocked_r (struct _reent *reent_ptr)
 	      if (i == 0)
 		{
 		  tz->__tzrule[0].ch = 'M';
-		  tz->__tzrule[0].m = 3;
-		  tz->__tzrule[0].n = 2;
-		  tz->__tzrule[0].d = 0;
+		  tz->__tzrule[0].month = 3;
+		  tz->__tzrule[0].week = 2;
+		  tz->__tzrule[0].day = 0;
 		}
 	      else
 		{
 		  tz->__tzrule[1].ch = 'M';
-		  tz->__tzrule[1].m = 11;
-		  tz->__tzrule[1].n = 1;
-		  tz->__tzrule[1].d = 0;
+		  tz->__tzrule[1].month = 11;
+		  tz->__tzrule[1].week = 1;
+		  tz->__tzrule[1].day = 0;
 		}
 	    }
 	  else
 	    {
 	      tz->__tzrule[i].ch = ch;
-	      tz->__tzrule[i].d = d;
+	      tz->__tzrule[i].day = d;
 	    }
 	  
 	  tzenv = end;
@@ -172,7 +172,7 @@ _tzset_unlocked_r (struct _reent *reent_ptr)
       if (*tzenv == '/')
 	sscanf (tzenv, "/%hu%n:%hu%n:%hu%n", &hh, &n, &mm, &n, &ss, &n);
 
-      tz->__tzrule[i].s = ss + SECSPERMIN * mm + SECSPERHOUR  * hh;
+      tz->__tzrule[i].secs = ss + SECSPERMIN * mm + SECSPERHOUR  * hh;
       
       tzenv += n;
     }
-- 
2.18.0