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Searchpath searches for the executable name in the same way that
sh(1) and rc(1) do.
The environment variable $PATH is treated as a colon-separated
list of directories in which to look for name. An empty string
in the list is treated as the current directory. If an executable
named name is found in one of the directories, searchpath returns
a pointer to a malloced string containing a path (dir/name, or
simply name) suitable for use in
open(3) or exec(3).
If name begins with ./ , ../ , or / , then the search path is
ignored. If name exists and is an executable, then searchpath
returns a malloced string containing name.
The returned buffer should be freed when no longer needed. If
name is not found, searchpath returns nil.
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