[9front] make arrays big: qsort edition

[ori@eigenstate.org]

Since usize exists, and is now 64 bit, we
should start slowly going through our code
and finding the places where we're using
int, short, etc in unexpected ways, so
that we can start allowing big arrays.

In some cases -- function parameters,
mainly, this is just a matter of switching
the types.

In others, like strlen, we may need to go
through all possible callers and make sure
that a new, bigger, return type doesn't get
silently truncated and cause issues.

This change does qsort.

--- /dist/plan9front/.git/fs/object/84b77568cda98a21dd4f3403a94c56724fbd5b37/tree//sys/include/libc.h
+++ /sys/include/libc.h
@@ -424,7 +424,7 @@
 extern	int	postnote(int, int, char *);
 extern	double	pow10(int);
 extern	int	putenv(char*, char*);
-extern	void	qsort(void*, long, long, int (*)(void*, void*));
+extern	void	qsort(void*, usize, usize, int (*)(void*, void*));
 extern	int	setjmp(jmp_buf);
 extern	double	strtod(char*, char**);
 extern	long	strtol(char*, char**, int);
--- /dist/plan9front/.git/fs/object/84b77568cda98a21dd4f3403a94c56724fbd5b37/tree//sys/src/libc/port/qsort.c
+++ /sys/src/libc/port/qsort.c
@@ -8,12 +8,12 @@
 struct
 {
 	int	(*cmp)(void*, void*);
-	void	(*swap)(char*, char*, long);
-	long	es;
+	void	(*swap)(char*, char*, usize);
+	usize	es;
 } Sort;
 
 static	void
-swapb(char *i, char *j, long es)
+swapb(char *i, char *j, usize es)
 {
 	char c;
 
@@ -27,7 +27,7 @@
 }
 
 static	void
-swapi(char *ii, char *ij, long es)
+swapi(char *ii, char *ij, usize es)
 {
 	long *i, *j, c;
 
@@ -42,9 +42,9 @@
 }
 
 static	char*
-pivot(char *a, long n, Sort *p)
+pivot(char *a, usize n, Sort *p)
 {
-	long j;
+	usize j;
 	char *pi, *pj, *pk;
 
 	j = n/6 * p->es;
@@ -69,9 +69,9 @@
 }
 
 static	void
-qsorts(char *a, long n, Sort *p)
+qsorts(char *a, usize n, Sort *p)
 {
-	long j, es;
+	usize j, es;
 	char *pi, *pj, *pn;
 
 	es = p->es;
@@ -111,7 +111,7 @@
 }
 
 void
-qsort(void *va, long n, long es, int (*cmp)(void*, void*))
+qsort(void *va, usize n, usize es, int (*cmp)(void*, void*))
 {
 	Sort s;