[PATCH] for gequal1 and gequalm1

[Jeroen Demeyer <jdemeyer@cage.ugent.be>]

Hello pari-dev,

This patch has been sitting for a long time in my pari directory (and
has been used by me for a long time).  It "fixes" gequal1 and gequalm1
in the sense that these functions should become more consistent with gequal.

I realize this patch might not cover all possible cases, but it surely
goes in the right direction.

Cheers,
Jeroen.

Index: src/basemath/gen2.c
===================================================================
--- src/basemath/gen2.c	(revision 12530)
+++ src/basemath/gen2.c	(working copy)
@@ -406,6 +406,8 @@
 int
 gequal1(GEN x)
 {
+  long i;
+
   switch(typ(x))
   {
     case t_INT:
@@ -432,8 +434,15 @@
     case t_QUAD:
       return gequal1(gel(x,2)) && gequal0(gel(x,3));
 
+    case t_SER:
+      if (valp(x) != 0) return 0;
     case t_POL:
-      return lg(x)==3 && gequal1(gel(x,2));
+      if (lg(x) < 3 || !gequal1(gel(x,2))) return 0;
+      for (i = 3; i < lg(x); i++) if (!gequal0(gel(x,i))) return 0;
+      return 1;
+
+    case t_RFRAC:
+      return gequal(gel(x,1), gel(x,2));
   }
   return 0;
 }
@@ -443,7 +452,7 @@
 gequalm1(GEN x)
 {
   pari_sp av;
-  long y;
+  long i, y;
   GEN p1;
 
   switch(typ(x))
@@ -476,8 +485,15 @@
       av=avma; p1 = gaddgs(gel(x,2), 1);
       y = signe(p1) && !gequal(p1,gel(x,1)); avma=av; return !y;
 
+    case t_SER:
+      if (valp(x) != 0) return 0;
     case t_POL:
-      return lg(x)==3 && gequalm1(gel(x,2));
+      if (lg(x) < 3 || !gequalm1(gel(x,2))) return 0;
+      for (i = 3; i < lg(x); i++) if (!gequal0(gel(x,i))) return 0;
+      return 1;
+
+    case t_RFRAC:
+      av = avma; y = gequal(gel(x,1), gneg(gel(x,2))); avma = av; return y;
   }
   return 0;
 }