realpath(3) should use PATH_MAX instead of MAXPATHLEN according to POSIX.

This also reverts the PATH_MAX -> MAXPATHLEN part of
rev 1.3 of src/bin/realpath/realpath.c

Requested by:	imp
Reviewed by:	imp, bde

2 files changed, 9 insertions, 9 deletions

diff --git a/lib/libc/stdlib/realpath.3 b/lib/libc/stdlib/realpath.3
index 2351c8f..2f84d1d 100644
--- a/lib/libc/stdlib/realpath.3
+++ b/lib/libc/stdlib/realpath.3
@@ -47,7 +47,7 @@
 .In sys/param.h
 .In stdlib.h
 .Ft "char *"
-.Fn realpath "const char *pathname" "char resolved_path[MAXPATHLEN]"
+.Fn realpath "const char *pathname" "char resolved_path[PATH_MAX]"
 .Sh DESCRIPTION
 The
 .Fn realpath
@@ -67,7 +67,7 @@ The
 argument
 .Em must
 refer to a buffer capable of storing at least
-.Dv MAXPATHLEN
+.Dv PATH_MAX
 characters.
 .Pp
 The
diff --git a/lib/libc/stdlib/realpath.c b/lib/libc/stdlib/realpath.c
index da6f1e2..8429986 100644
--- a/lib/libc/stdlib/realpath.c
+++ b/lib/libc/stdlib/realpath.c
@@ -52,7 +52,7 @@ __FBSDID("$FreeBSD$");
 #include "un-namespace.h"
 
 /*
- * char *realpath(const char *path, char resolved_path[MAXPATHLEN]);
+ * char *realpath(const char *path, char resolved_path[PATH_MAX]);
  *
  * Find the real name of path, by removing all ".", ".." and symlink
  * components.  Returns (resolved) on success, or (NULL) on failure,
@@ -65,7 +65,7 @@ realpath(path, resolved)
 {
 	struct stat sb;
 	int fd, n, rootd, serrno;
-	char *p, *q, wbuf[MAXPATHLEN];
+	char *p, *q, wbuf[PATH_MAX];
 	int symlinks = 0;
 
 	/* Save the starting point. */
@@ -82,8 +82,8 @@ realpath(path, resolved)
 	 *     if it is a directory, then change to that directory.
 	 * get the current directory name and append the basename.
 	 */
-	(void)strncpy(resolved, path, MAXPATHLEN - 1);
-	resolved[MAXPATHLEN - 1] = '\0';
+	(void)strncpy(resolved, path, PATH_MAX - 1);
+	resolved[PATH_MAX - 1] = '\0';
 loop:
 	q = strrchr(resolved, '/');
 	if (q != NULL) {
@@ -109,7 +109,7 @@ loop:
 				errno = ELOOP;
 				goto err1;
 			}
-			n = readlink(p, resolved, MAXPATHLEN - 1);
+			n = readlink(p, resolved, PATH_MAX - 1);
 			if (n < 0)
 				goto err1;
 			resolved[n] = '\0';
@@ -127,7 +127,7 @@ loop:
 	 * the current directory.
 	 */
 	(void)strcpy(wbuf, p);
-	if (getcwd(resolved, MAXPATHLEN) == 0)
+	if (getcwd(resolved, PATH_MAX) == 0)
 		goto err1;
 
 	/*
@@ -140,7 +140,7 @@ loop:
 		rootd = 0;
 
 	if (*wbuf) {
-		if (strlen(resolved) + strlen(wbuf) + rootd + 1 > MAXPATHLEN) {
+		if (strlen(resolved) + strlen(wbuf) + rootd + 1 > PATH_MAX) {
 			errno = ENAMETOOLONG;
 			goto err1;
 		}