PowerPC Linux support from ericvh.

Mainly adding va_copy/va_end.
Also fix bug in sprint wrapping
around top of memory.

src/lib9/fmt/fmtprint.c

@@ -32,14 +32,15 @@ fmtprint(Fmt *f, char *fmt, ...)
 	f->flags = 0;
 	f->width = 0;
 	f->prec = 0;
-	va = f->args;
+	va_copy(va, f->args);
 	va_start(f->args, fmt);
 	n = dofmt(f, fmt);
 	va_end(f->args);
 	f->flags = 0;
 	f->width = 0;
 	f->prec = 0;
-	f->args = va;
+	va_copy(f->args,va);
+	va_end(va);
 	if(n >= 0)
 		return 0;
 	return n;

src/lib9/fmt/fmtvprint.c

@@ -32,13 +32,15 @@ fmtvprint(Fmt *f, char *fmt, va_list args)
 	f->flags = 0;
 	f->width = 0;
 	f->prec = 0;
-	va = f->args;
-	f->args = args;
+	va_copy(va,f->args);
+	va_copy(f->args,args);
 	n = dofmt(f, fmt);
 	f->flags = 0;
 	f->width = 0;
 	f->prec = 0;
-	f->args = va;
+	va_end(f->args);
+	va_copy(f->args,va);
+	va_end(va);
 	if(n >= 0)
 		return 0;
 	return n;

src/lib9/fmt/nan64.c

@@ -7,7 +7,7 @@
 
 #include "nan.h"
 
-#ifdef __APPLE__
+#if defined (__APPLE__) || (__powerpc__)
 #define _NEEDLL
 #endif
 

src/lib9/fmt/runevseprint.c

@@ -31,8 +31,9 @@ runevseprint(Rune *buf, Rune *e, char *fmt, va_list args)
 	f.flush = nil;
 	f.farg = nil;
 	f.nfmt = 0;
-	f.args = args;
+	va_copy(f.args,args);
 	dofmt(&f, fmt);
+	va_end(f.args);
 	*(Rune*)f.to = '\0';
 	return (Rune*)f.to;
 }

src/lib9/fmt/runevsmprint.c

@@ -28,8 +28,9 @@ runevsmprint(char *fmt, va_list args)
 
 	if(runefmtstrinit(&f) < 0)
 		return nil;
-	f.args = args;
+	va_copy(f.args,args);
 	n = dofmt(&f, fmt);
+	va_end(f.args);
 	if(n < 0)
 		return nil;
 	*(Rune*)f.to = '\0';

src/lib9/fmt/runevsnprint.c

@@ -31,8 +31,9 @@ runevsnprint(Rune *buf, int len, char *fmt, va_list args)
 	f.flush = nil;
 	f.farg = nil;
 	f.nfmt = 0;
-	f.args = args;
+	va_copy(f.args,args);
 	dofmt(&f, fmt);
+	va_end(f.args);
 	*(Rune*)f.to = '\0';
 	return (Rune*)f.to - buf;
 }

src/lib9/fmt/sprint.c

@@ -18,10 +18,19 @@ int
 sprint(char *buf, char *fmt, ...)
 {
 	int n;
+	uint len;
 	va_list args;
 
+	len = 1<<30;  /* big number, but sprint is deprecated anyway */
+	/*
+	 * on PowerPC, the stack is near the top of memory, so
+	 * we must be sure not to overflow a 32-bit pointer.
+	 */
+	if(buf+len < buf)
+		len = -(uint)buf-1;
+
 	va_start(args, fmt);
-	n = vsnprint(buf, 65536, fmt, args);	/* big number, but sprint is deprecated anyway */
+	n = vsnprint(buf, len, fmt, args);
 	va_end(args);
 	return n;
 }

src/lib9/fmt/vfprint.c

@@ -23,8 +23,9 @@ vfprint(int fd, char *fmt, va_list args)
 	int n;
 
 	fmtfdinit(&f, fd, buf, sizeof(buf));
-	f.args = args;
+	va_copy(f.args,args);
 	n = dofmt(&f, fmt);
+	va_end(f.args);
 	if(n > 0 && __fmtFdFlush(&f) == 0)
 		return -1;
 	return n;

src/lib9/fmt/vseprint.c

@@ -29,8 +29,9 @@ vseprint(char *buf, char *e, char *fmt, va_list args)
 	f.flush = 0;
 	f.farg = nil;
 	f.nfmt = 0;
-	f.args = args;
+	va_copy(f.args,args);
 	dofmt(&f, fmt);
+	va_end(f.args);
 	*(char*)f.to = '\0';
 	return (char*)f.to;
 }

src/lib9/fmt/vsmprint.c

@@ -27,8 +27,9 @@ vsmprint(char *fmt, va_list args)
 
 	if(fmtstrinit(&f) < 0)
 		return nil;
-	f.args = args;
+	va_copy(f.args,args);
 	n = dofmt(&f, fmt);
+	va_end(f.args);
 	if(n < 0)
 		return nil;
 	return fmtstrflush(&f);

src/lib9/fmt/vsnprint.c

@@ -20,6 +20,7 @@ int
 vsnprint(char *buf, int len, char *fmt, va_list args)
 {
 	Fmt f;
+	int x = 0;
 
 	if(len <= 0)
 		return -1;
@@ -30,8 +31,9 @@ vsnprint(char *buf, int len, char *fmt, va_list args)
 	f.flush = 0;
 	f.farg = nil;
 	f.nfmt = 0;
-	f.args = args;
+	va_copy(f.args,args);
 	dofmt(&f, fmt);
+	va_end(f.args);
 	*(char*)f.to = '\0';
 	return (char*)f.to - buf;
 }