29         /* allowed as an extension, allocate memory for the output path */  in realpath()
37     /* canonical path starts with / */  in realpath()
40     /* pointers moving over the input and output path buffers */  in realpath()
43     /* number of path components in the output buffer */  in realpath()
48         /* "path component" is the part between two '/' path separators.  in realpath()
49          * locate the next path component in the input path:  in realpath()
56             /* empty path component or '.' - nothing to do */  in realpath()
58             /* '..' - remove one path component from the output */  in realpath()
62                 /* there is only one path component in output;  in realpath()
69                 /* remove last path component and the separator preceding it */  in realpath()
77             /* copy path component to output; +1 is for the separator  */  in realpath()
94         /* move input pointer to separator right after this path component */  in realpath()
120 int chdir(const char *path)  in chdir()  argument
122     (void) path;  in chdir()