Simplify bignum->intmax conversion

* src/lisp.h (integer_to_intmax, integer_to_uintmax): New functions.
* src/data.c (cons_to_unsigned, cons_to_signed)
(arith_driver):
* src/dbusbind.c (xd_extract_signed, xd_extract_unsigned):
* src/dispnew.c (sit_for):
* src/editfns.c (styled_format):
* src/emacs-module.c (module_extract_integer):
* src/fileio.c (file_offset):
* src/font.c (font_unparse_xlfd, Fopen_font):
* src/xdisp.c (calc_line_height_property):
* src/process.c (handle_child_signal):

10 files changed, 89 insertions, 109 deletions

diff --git a/src/data.c b/src/data.c
index 7be2052362b..66f69e7e83a 100644
--- a/src/data.c
+++ b/src/data.c
@@ -2653,17 +2653,7 @@ cons_to_unsigned (Lisp_Object c, uintmax_t max)
   else
     {
       Lisp_Object hi = CONSP (c) ? XCAR (c) : c;
-
-      if (FIXNUMP (hi))
-	{
-	  val = XFIXNUM (hi);
-	  valid = 0 <= val;
-	}
-      else
-	{
-	  val = bignum_to_uintmax (hi);
-	  valid = val != 0;
-	}
+      valid = integer_to_uintmax (hi, &val);
 
       if (valid && CONSP (c))
 	{
@@ -2724,17 +2714,7 @@ cons_to_signed (Lisp_Object c, intmax_t min, intmax_t max)
   else
     {
       Lisp_Object hi = CONSP (c) ? XCAR (c) : c;
-
-      if (FIXNUMP (hi))
-	{
-	  val = XFIXNUM (hi);
-	  valid = true;
-	}
-      else if (BIGNUMP (hi))
-	{
-	  val = bignum_to_intmax (hi);
-	  valid = val != 0;
-	}
+      valid = integer_to_intmax (hi, &val);
 
       if (valid && CONSP (c))
 	{
@@ -2972,16 +2952,8 @@ arith_driver (enum arithop code, ptrdiff_t nargs, Lisp_Object *args,
 
 	/* Set NEXT to the next value if it fits, else exit the loop.  */
 	intmax_t next;
-	if (FIXNUMP (val))
-	  next = XFIXNUM (val);
-	else if (FLOATP (val))
+	if (! (INTEGERP (val) && integer_to_intmax (val, &next)))
 	  break;
-	else
-	  {
-	    next = bignum_to_intmax (val);
-	    if (next == 0)
-	      break;
-	  }
 
 	/* Set ACCUM to the next operation's result if it fits,
 	   else exit the loop.  */
diff --git a/src/dbusbind.c b/src/dbusbind.c
index 47346a7d4d4..9bc344e9612 100644
--- a/src/dbusbind.c
+++ b/src/dbusbind.c
@@ -520,12 +520,13 @@ static intmax_t
 xd_extract_signed (Lisp_Object x, intmax_t lo, intmax_t hi)
 {
   CHECK_NUMBER (x);
-  if (FIXNUMP (x))
+  if (INTEGERP (x))
     {
-      if (lo <= XFIXNUM (x) && XFIXNUM (x) <= hi)
-	return XFIXNUM (x);
+      intmax_t i;
+      if (integer_to_intmax (x, &i) && lo <= i && i <= hi)
+	return i;
     }
-  else if (FLOATP (x))
+  else
     {
       double d = XFLOAT_DATA (x);
       if (lo <= d && d < 1.0 + hi)
@@ -535,12 +536,6 @@ xd_extract_signed (Lisp_Object x, intmax_t lo, intmax_t hi)
 	    return n;
 	}
     }
-  else if (! (MOST_NEGATIVE_FIXNUM <= lo && hi <= MOST_POSITIVE_FIXNUM))
-    {
-      intmax_t i = bignum_to_intmax (x);
-      if (i != 0 && lo <= i && i <= hi)
-	return i;
-    }
 
   if (xd_in_read_queued_messages)
     Fthrow (Qdbus_error, Qnil);
@@ -553,12 +548,13 @@ static uintmax_t
 xd_extract_unsigned (Lisp_Object x, uintmax_t hi)
 {
   CHECK_NUMBER (x);
-  if (FIXNUMP (x))
+  if (INTEGERP (x))
     {
-      if (0 <= XFIXNUM (x) && XFIXNUM (x) <= hi)
-	return XFIXNUM (x);
+      uintmax_t i;
+      if (integer_to_uintmax (x, &i) && i <= hi)
+	return i;
     }
-  else if (FLOATP (x))
+  else
     {
       double d = XFLOAT_DATA (x);
       if (0 <= d && d < 1.0 + hi)
@@ -568,12 +564,6 @@ xd_extract_unsigned (Lisp_Object x, uintmax_t hi)
 	    return n;
 	}
     }
-  else if (! (hi <= MOST_POSITIVE_FIXNUM))
-    {
-      uintmax_t i = bignum_to_uintmax (x);
-      if (i != 0 && i <= hi)
-	return i;
-    }
 
   if (xd_in_read_queued_messages)
     Fthrow (Qdbus_error, Qnil);
diff --git a/src/dispnew.c b/src/dispnew.c
index bd246799b23..798413d091c 100644
--- a/src/dispnew.c
+++ b/src/dispnew.c
@@ -5765,20 +5765,20 @@ sit_for (Lisp_Object timeout, bool reading, int display_option)
   if (display_option > 1)
     redisplay_preserve_echo_area (2);
 
-  if (FIXNUMP (timeout))
+  if (INTEGERP (timeout))
     {
-      sec = XFIXNUM (timeout);
-      if (sec <= 0)
-	return Qt;
-      nsec = 0;
-    }
-  else if (BIGNUMP (timeout))
-    {
-      if (NILP (Fnatnump (timeout)))
-	return Qt;
-      sec = bignum_to_intmax (timeout);
-      if (sec == 0)
-	sec = WAIT_READING_MAX;
+      if (integer_to_intmax (timeout, &sec))
+	{
+	  if (sec <= 0)
+	    return Qt;
+	  sec = min (sec, WAIT_READING_MAX);
+	}
+      else
+	{
+	  if (NILP (Fnatnump (timeout)))
+	    return Qt;
+	  sec = WAIT_READING_MAX;
+	}
       nsec = 0;
     }
   else if (FLOATP (timeout))
diff --git a/src/editfns.c b/src/editfns.c
index 3b1c21a1781..4ea70253793 100644
--- a/src/editfns.c
+++ b/src/editfns.c
@@ -4691,21 +4691,16 @@ styled_format (ptrdiff_t nargs, Lisp_Object *args, bool message)
 			}
 		      else
 			{
-			  if (FIXNUMP (arg))
-			    ldarg = XFIXNUM (arg);
-			  else
+			  if (INTEGERP (arg))
 			    {
-			      intmax_t iarg = bignum_to_intmax (arg);
-			      if (iarg != 0)
+			      intmax_t iarg;
+			      uintmax_t uarg;
+			      if (integer_to_intmax (arg, &iarg))
 				ldarg = iarg;
+			      else if (integer_to_uintmax (arg, &uarg))
+				ldarg = uarg;
 			      else
-				{
-				  uintmax_t uarg = bignum_to_uintmax (arg);
-				  if (uarg != 0)
-				    ldarg = uarg;
-				  else
-				    format_bignum_as_double = true;
-				}
+				format_bignum_as_double = true;
 			    }
 			  if (!format_bignum_as_double)
 			    {
diff --git a/src/emacs-module.c b/src/emacs-module.c
index 2ba5540d9a1..6155535f869 100644
--- a/src/emacs-module.c
+++ b/src/emacs-module.c
@@ -519,14 +519,10 @@ module_extract_integer (emacs_env *env, emacs_value n)
   MODULE_FUNCTION_BEGIN (0);
   Lisp_Object l = value_to_lisp (n);
   CHECK_INTEGER (l);
-  if (BIGNUMP (l))
-    {
-      intmax_t i = bignum_to_intmax (l);
-      if (i == 0)
-	xsignal1 (Qoverflow_error, l);
-      return i;
-    }
-  return XFIXNUM (l);
+  intmax_t i;
+  if (! integer_to_intmax (l, &i))
+    xsignal1 (Qoverflow_error, l);
+  return i;
 }
 
 static emacs_value
diff --git a/src/fileio.c b/src/fileio.c
index a91bdaa53d1..66b23333172 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -3424,17 +3424,13 @@ read_non_regular_quit (Lisp_Object ignore)
 static off_t
 file_offset (Lisp_Object val)
 {
-  if (RANGED_FIXNUMP (0, val, TYPE_MAXIMUM (off_t)))
-    return XFIXNUM (val);
-
-  if (BIGNUMP (val))
+  if (INTEGERP (val))
     {
-      intmax_t v = bignum_to_intmax (val);
-      if (0 < v && v <= TYPE_MAXIMUM (off_t))
+      intmax_t v;
+      if (integer_to_intmax (val, &v) && 0 <= v && v <= TYPE_MAXIMUM (off_t))
 	return v;
     }
-
-  if (FLOATP (val))
+  else if (FLOATP (val))
     {
       double v = XFLOAT_DATA (val);
       if (0 <= v && v < 1.0 + TYPE_MAXIMUM (off_t))
diff --git a/src/font.c b/src/font.c
index e2414582f67..50ec39a9a49 100644
--- a/src/font.c
+++ b/src/font.c
@@ -1289,8 +1289,9 @@ font_unparse_xlfd (Lisp_Object font, int pixel_size, char *name, int nbytes)
 				  1 + DBL_MAX_10_EXP + 1)];
   if (INTEGERP (val))
     {
-      intmax_t v = FIXNUMP (val) ? XFIXNUM (val) : bignum_to_intmax (val);
-      if (! (0 < v && v <= TYPE_MAXIMUM (uprintmax_t)))
+      intmax_t v;
+      if (! (integer_to_intmax (val, &v)
+	     && 0 < v && v <= TYPE_MAXIMUM (uprintmax_t)))
 	v = pixel_size;
       if (v > 0)
 	{
@@ -4747,16 +4748,10 @@ DEFUN ("open-font", Fopen_font, Sopen_font, 1, 3, 0,
   else
     {
       CHECK_NUMBER (size);
-      if (BIGNUMP (size))
-	{
-	  isize = bignum_to_intmax (size);
-	  if (isize == 0)
-	    args_out_of_range (font_entity, size);
-	}
-      else
-	isize = (FLOATP (size)
-		 ? POINT_TO_PIXEL (XFLOAT_DATA (size), FRAME_RES_Y (f))
-		 : XFIXNUM (size));
+      if (FLOATP (size))
+	isize = POINT_TO_PIXEL (XFLOAT_DATA (size), FRAME_RES_Y (f));
+      else if (! integer_to_intmax (size, &isize))
+	args_out_of_range (font_entity, size);
       if (! (INT_MIN <= isize && isize <= INT_MAX))
 	args_out_of_range (font_entity, size);
       if (isize == 0)
diff --git a/src/lisp.h b/src/lisp.h
index d244bc02d4b..78c25f97dc8 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -3297,6 +3297,39 @@ extern Lisp_Object bignum_to_string (Lisp_Object, int);
 extern Lisp_Object make_bignum_str (char const *, int);
 extern Lisp_Object double_to_bignum (double);
 
+/* Converthe integer NUM to *N.  Return true if successful, false
+   (possibly setting *N) otherwise.  */
+INLINE bool
+integer_to_intmax (Lisp_Object num, intmax_t *n)
+{
+  if (FIXNUMP (num))
+    {
+      *n = XFIXNUM (num);
+      return true;
+    }
+  else
+    {
+      intmax_t i = bignum_to_intmax (num);
+      *n = i;
+      return i != 0;
+    }
+}
+INLINE bool
+integer_to_uintmax (Lisp_Object num, uintmax_t *n)
+{
+  if (FIXNUMP (num))
+    {
+      *n = XFIXNUM (num);
+      return 0 <= XFIXNUM (num);
+    }
+  else
+    {
+      uintmax_t i = bignum_to_uintmax (num);
+      *n = i;
+      return i != 0;
+    }
+}
+
 /* Defined in data.c.  */
 extern _Noreturn void wrong_choice (Lisp_Object, Lisp_Object);
 extern void notify_variable_watchers (Lisp_Object, Lisp_Object,
diff --git a/src/process.c b/src/process.c
index 9d03eb9774d..454278a5a27 100644
--- a/src/process.c
+++ b/src/process.c
@@ -7055,8 +7055,9 @@ handle_child_signal (int sig)
       xpid = XCAR (head);
       if (all_pids_are_fixnums ? FIXNUMP (xpid) : INTEGERP (xpid))
 	{
-	  pid_t deleted_pid = (FIXNUMP (xpid) ? XFIXNUM (xpid)
-			       : bignum_to_intmax (xpid));
+	  intmax_t deleted_pid;
+	  bool ok = integer_to_intmax (xpid, &deleted_pid);
+	  eassert (ok);
 	  if (child_status_changed (deleted_pid, 0, 0))
 	    {
 	      if (STRINGP (XCDR (head)))
diff --git a/src/xdisp.c b/src/xdisp.c
index 04033665d76..47286e25c80 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -27910,10 +27910,12 @@ calc_line_height_property (struct it *it, Lisp_Object val, struct font *font,
   /* FIXME: Check for overflow in multiplication or conversion.  */
   if (FLOATP (val))
     height = (int)(XFLOAT_DATA (val) * height);
-  else if (FIXNUMP (val))
-    height *= XFIXNUM (val);
   else
-    height *= bignum_to_intmax (val);
+    {
+      intmax_t v;
+      if (integer_to_intmax (val, &v))
+	height *= v;
+    }
 
   return make_fixnum (height);
 }