Make doprnt and related functions ANSI C compliant, with prototypes.

* doprnt.c (doprnt): Take a va_list argument instead of count and
pointer.
* eval.c (error): Change to a standard-C variadic function.
* xdisp.c (vmessage): Renamed from message, made static, and
changed to take a va_list argument.
(message): New variadic wrapper.
(message_nolog): Now a variadic function, calling vmessage.
* lisp.h: Include stdarg.h for va_list.
(doprnt, error, message, message_nolog): Decls updated.

5 files changed, 65 insertions, 47 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index a7c8a9844f1..c5c4b04e88a 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,15 @@
+2010-07-11  Ken Raeburn  <raeburn@raeburn.org>
+
+        * doprnt.c (doprnt): Take a va_list argument instead of count and
+        pointer.
+        * eval.c (error): Change to a standard-C variadic function.
+        * xdisp.c (vmessage): Renamed from message, made static, and
+        changed to take a va_list argument.
+        (message): New variadic wrapper.
+        (message_nolog): Now a variadic function, calling vmessage.
+        * lisp.h: Include stdarg.h for va_list.
+        (doprnt, error, message, message_nolog): Decls updated.
+
 2010-07-11  Eli Zaretskii  <eliz@gnu.org>
 
         * process.c (syms_of_process) <delete-exited-processes>: Define
diff --git a/src/doprnt.c b/src/doprnt.c
index 3ff2f70dd34..1a165145b56 100644
--- a/src/doprnt.c
+++ b/src/doprnt.c
@@ -59,9 +59,8 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
    Integers are passed as C integers.  */
 
 int
-doprnt (char *buffer, register int bufsize, char *format, char *format_end, int nargs, char **args)
+doprnt (char *buffer, register int bufsize, char *format, char *format_end, va_list ap)
 {
-  int cnt = 0;                  /* Number of arg to gobble next */
   register char *fmt = format;  /* Pointer into format string */
   register char *bufptr = buffer; /* Pointer into output buffer.. */
 
@@ -161,8 +160,6 @@ doprnt (char *buffer, register int bufsize, char *format, char *format_end, int
             case 'd':
             case 'o':
             case 'x':
-              if (cnt == nargs)
-                error ("Not enough arguments for format string");
               if (sizeof (int) == sizeof (EMACS_INT))
                 ;
               else if (sizeof (long) == sizeof (EMACS_INT))
@@ -173,7 +170,7 @@ doprnt (char *buffer, register int bufsize, char *format, char *format_end, int
                 string++;
               else
                 abort ();
-              sprintf (sprintf_buffer, fmtcpy, args[cnt++]);
+              sprintf (sprintf_buffer, fmtcpy, va_arg(ap, char *));
               /* Now copy into final output, truncating as nec.  */
               string = (unsigned char *) sprintf_buffer;
               goto doit;
@@ -182,12 +179,8 @@ doprnt (char *buffer, register int bufsize, char *format, char *format_end, int
             case 'e':
             case 'g':
               {
-                union { double d; char *half[2]; } u;
-                if (cnt + 1 == nargs)
-                  error ("Not enough arguments for format string");
-                u.half[0] = args[cnt++];
-                u.half[1] = args[cnt++];
-                sprintf (sprintf_buffer, fmtcpy, u.d);
+                double d = va_arg(ap, double);
+                sprintf (sprintf_buffer, fmtcpy, d);
                 /* Now copy into final output, truncating as nec.  */
                 string = (unsigned char *) sprintf_buffer;
                 goto doit;
@@ -196,11 +189,9 @@ doprnt (char *buffer, register int bufsize, char *format, char *format_end, int
             case 'S':
               string[-1] = 's';
             case 's':
-              if (cnt == nargs)
-                error ("Not enough arguments for format string");
               if (fmtcpy[1] != 's')
                 minlen = atoi (&fmtcpy[1]);
-              string = (unsigned char *) args[cnt++];
+              string = va_arg(ap, unsigned char *);
               tem = strlen (string);
               width = strwidth (string, tem);
               goto doit1;
@@ -250,16 +241,21 @@ doprnt (char *buffer, register int bufsize, char *format, char *format_end, int
               continue;
 
             case 'c':
-              if (cnt == nargs)
-                error ("Not enough arguments for format string");
-              tem = CHAR_STRING ((int) (EMACS_INT) args[cnt], charbuf);
-              string = charbuf;
-              cnt++;
-              string[tem] = 0;
-              width = strwidth (string, tem);
-              if (fmtcpy[1] != 'c')
-                minlen = atoi (&fmtcpy[1]);
-              goto doit1;
+              {
+                /* Sometimes for %c we pass a char, which would widen
+                   to int.  Sometimes we pass XFASTINT() or XINT()
+                   values, which would be EMACS_INT.  Let's hope that
+                   both are passed the same way, otherwise we'll need
+                   to rewrite callers.  */
+                EMACS_INT chr = va_arg(ap, EMACS_INT);
+                tem = CHAR_STRING ((int) chr, charbuf);
+                string = charbuf;
+                string[tem] = 0;
+                width = strwidth (string, tem);
+                if (fmtcpy[1] != 'c')
+                  minlen = atoi (&fmtcpy[1]);
+                goto doit1;
+              }
 
             case '%':
               fmt--;    /* Drop thru and this % will be treated as normal */
diff --git a/src/eval.c b/src/eval.c
index fa65a5f0d6e..140ba85d789 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -2003,9 +2003,7 @@ find_handler_clause (Lisp_Object handlers, Lisp_Object conditions,
 
 /* VARARGS 1 */
 void
-error (m, a1, a2, a3)
-     char *m;
-     char *a1, *a2, *a3;
+error (char *m, ...)
 {
   char buf[200];
   int size = 200;
@@ -2015,15 +2013,18 @@ error (m, a1, a2, a3)
   int allocated = 0;
   Lisp_Object string;
 
-  args[0] = a1;
-  args[1] = a2;
-  args[2] = a3;
-
   mlen = strlen (m);
 
   while (1)
     {
-      int used = doprnt (buffer, size, m, m + mlen, 3, args);
+      va_list ap;
+      int used;
+
+      /* A va_list can't be reused if we have to go around the loop
+         again; we need to "reinitialize" it each time.  */
+      va_start(ap, m);
+      used = doprnt (buffer, size, m, m + mlen, ap);
+      va_end(ap);
       if (used < size)
         break;
       size *= 2;
diff --git a/src/lisp.h b/src/lisp.h
index 02c9ed03e13..16fe4702d5c 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -21,6 +21,8 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #ifndef EMACS_LISP_H
 #define EMACS_LISP_H
 
+#include <stdarg.h>
+
 /* Use the configure flag --enable-checking[=LIST] to enable various
    types of run time checks for Lisp objects.  */
 
@@ -2648,8 +2650,8 @@ extern void restore_message (void);
 extern Lisp_Object current_message (void);
 extern void set_message (const char *s, Lisp_Object, int, int);
 extern void clear_message (int, int);
-extern void message (/* char *, ... */);
-extern void message_nolog (/* char *, ... */);
+extern void message (char *, ...);
+extern void message_nolog (char *, ...);
 extern void message1 (char *);
 extern void message1_nolog (char *);
 extern void message2 (const char *, int, int);
@@ -2798,7 +2800,7 @@ extern void float_to_string (unsigned char *, double);
 extern void syms_of_print (void);
 
 /* Defined in doprnt.c */
-extern int doprnt (char *, int, char *, char *, int, char **);
+extern int doprnt (char *, int, char *, char *, va_list);
 
 /* Defined in lread.c */
 extern Lisp_Object Qvariable_documentation, Qstandard_input;
@@ -2910,7 +2912,7 @@ extern Lisp_Object internal_condition_case_n (Lisp_Object (*) (int, Lisp_Object
 extern void specbind (Lisp_Object, Lisp_Object);
 extern void record_unwind_protect (Lisp_Object (*) (Lisp_Object), Lisp_Object);
 extern Lisp_Object unbind_to (int, Lisp_Object);
-extern void error (/* char *, ... */) NO_RETURN;
+extern void error (char *, ...) NO_RETURN;
 extern void do_autoload (Lisp_Object, Lisp_Object);
 extern Lisp_Object un_autoload (Lisp_Object);
 EXFUN (Ffetch_bytecode, 1);
diff --git a/src/xdisp.c b/src/xdisp.c
index b6bd231bb67..80efbb5679c 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -8494,9 +8494,8 @@ message_with_string (char *m, Lisp_Object string, int log)
 /* Dump an informative message to the minibuf.  If M is 0, clear out
    any existing message, and let the mini-buffer text show through.  */
 
-/* VARARGS 1 */
-void
-message (char *m, EMACS_INT a1, EMACS_INT a2, EMACS_INT a3)
+static void
+vmessage (char *m, va_list ap)
 {
   if (noninteractive)
     {
@@ -8505,7 +8504,7 @@ message (char *m, EMACS_INT a1, EMACS_INT a2, EMACS_INT a3)
           if (noninteractive_need_newline)
             putc ('\n', stderr);
           noninteractive_need_newline = 0;
-          fprintf (stderr, m, a1, a2, a3);
+          vfprintf (stderr, m, ap);
           if (cursor_in_echo_area == 0)
             fprintf (stderr, "\n");
           fflush (stderr);
@@ -8533,13 +8532,9 @@ message (char *m, EMACS_INT a1, EMACS_INT a2, EMACS_INT a3)
           if (m)
             {
               int len;
-              char *a[3];
-              a[0] = (char *) a1;
-              a[1] = (char *) a2;
-              a[2] = (char *) a3;
 
               len = doprnt (FRAME_MESSAGE_BUF (f),
-                            FRAME_MESSAGE_BUF_SIZE (f), m, (char *)0, 3, a);
+                            FRAME_MESSAGE_BUF_SIZE (f), m, (char *)0, ap);
 
               message2 (FRAME_MESSAGE_BUF (f), len, 0);
             }
@@ -8553,17 +8548,29 @@ message (char *m, EMACS_INT a1, EMACS_INT a2, EMACS_INT a3)
     }
 }
 
+void
+message (char *m, ...)
+{
+  va_list ap;
+  va_start (ap, m);
+  vmessage (m, ap);
+  va_end (ap);
+}
+
 
 /* The non-logging version of message.  */
 
 void
-message_nolog (char *m, EMACS_INT a1, EMACS_INT a2, EMACS_INT a3)
+message_nolog (char *m, ...)
 {
   Lisp_Object old_log_max;
+  va_list ap;
+  va_start (ap, m);
   old_log_max = Vmessage_log_max;
   Vmessage_log_max = Qnil;
-  message (m, a1, a2, a3);
+  vmessage (m, ap);
   Vmessage_log_max = old_log_max;
+  va_end (ap);
 }