syslogd: fix "readpath bug" by using readlink instead

libbb: rename xgetcwd and xreadlink

libbb/copy_file.c

@@ -233,7 +233,7 @@ int copy_file(const char *source, const char *dest, int flags)
 		} else if (S_ISLNK(source_stat.st_mode)) {
 			char *lpath;
 
-			lpath = xreadlink(source);
+			lpath = xmalloc_readlink_or_warn(source);
 			if (symlink(lpath, dest) < 0) {
 				bb_perror_msg("cannot create symlink '%s'", dest);
 				free(lpath);

libbb/lineedit.c

@@ -1090,7 +1090,7 @@ static void parse_prompt(const char *prmt_ptr)
 	size_t cur_prmt_len = 0;
 	char flg_not_length = '[';
 	char *prmt_mem_ptr = xzalloc(1);
-	char *pwd_buf = xgetcwd(0);
+	char *pwd_buf = xrealloc_getcwd_or_warn(NULL);
 	char buf2[PATH_MAX + 1];
 	char buf[2];
 	char c;

libbb/simplify_path.c

@@ -16,7 +16,7 @@ char *bb_simplify_path(const char *path)
 	if (path[0] == '/')
 		start = xstrdup(path);
 	else {
-		s = xgetcwd(NULL);
+		s = xrealloc_getcwd_or_warn(NULL);
 		start = concat_path_file(s, path);
 		free(s);
 	}

libbb/xgetcwd.c

@@ -18,7 +18,7 @@
 */
 
 char *
-xgetcwd(char *cwd)
+xrealloc_getcwd_or_warn(char *cwd)
 {
 	char *ret;
 	unsigned path_max;
@@ -26,7 +26,7 @@ xgetcwd(char *cwd)
 	path_max = (unsigned) PATH_MAX;
 	path_max += 2;                /* The getcwd docs say to do this. */
 
-	if (cwd==0)
+	if (cwd == NULL)
 		cwd = xmalloc(path_max);
 
 	while ((ret = getcwd(cwd, path_max)) == NULL && errno == ERANGE) {

libbb/xreadlink.c

@@ -11,7 +11,7 @@
  * yourself. You have been warned.
  */
 
-char *xreadlink(const char *path)
+char *xmalloc_readlink_or_warn(const char *path)
 {
 	enum { GROWBY = 80 }; /* how large we will grow strings by */