Fix off-by-one in apathmax() as the path is relative to "/"

1) Use size_t * instead of long *
2) Fallback to PATH_MAX instead of BUFSIZ
3) Header cleanup

libutil/agetcwd.c

@@ -7,7 +7,7 @@ char *
 agetcwd(void)
 {
 	char *buf;
-	long size;
+	size_t size;
 
 	apathmax(&buf, &size);
 	if (!getcwd(buf, size))

libutil/apathmax.c

@@ -1,22 +1,22 @@
 /* See LICENSE file for copyright and license details. */
 #include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
+#include <limits.h>
 #include <unistd.h>
 
 #include "../util.h"
 
 void
-apathmax(char **p, long *size)
+apathmax(char **p, size_t *size)
 {
 	errno = 0;
-
 	if ((*size = pathconf("/", _PC_PATH_MAX)) < 0) {
 		if (errno == 0) {
-			*size = BUFSIZ;
+			*size = PATH_MAX;
 		} else {
 			eprintf("pathconf:");
 		}
+	} else {
+		(*size)++;
 	}
 	*p = emalloc(*size);
 }

libutil/cp.c

@@ -28,7 +28,7 @@ cp(const char *s1, const char *s2, int depth)
 {
 	FILE *f1, *f2;
 	char *ns1, *ns2;
-	long size1, size2;
+	size_t size1, size2;
 	struct dirent *d;
 	struct stat st;
 	struct utimbuf ut;

libutil/enmasse.c

@@ -11,11 +11,10 @@
 void
 enmasse(int argc, char *argv[], int (*fn)(const char *, const char *, int))
 {
+	struct stat st;
 	char *buf, *dir;
 	int i, len;
-	long size;
-	struct stat st;
-	size_t dlen;
+	size_t size, dlen;
 
 	if (argc == 2 && !(stat(argv[1], &st) == 0 && S_ISDIR(st.st_mode))) {
 		fnck(argv[0], argv[1], fn, 0);

util.h

@@ -21,7 +21,7 @@
 extern char *argv0;
 
 char *agetcwd(void);
-void apathmax(char **, long *);
+void apathmax(char **, size_t *);
 
 void *ecalloc(size_t, size_t);
 void *emalloc(size_t);