-/* Read up to (and including) a delimiter DELIM1 from STREAM into *LINEPTR
- + OFFSET (and NUL-terminate it). If DELIM2 is non-zero, then read up
- and including the first occurrence of DELIM1 or DELIM2. *LINEPTR is
- a pointer returned from malloc (or NULL), pointing to *LINESIZE bytes of
- space. It is realloc'd as necessary. Reallocation is limited to
- NMAX bytes; if the line is longer than that, the extra bytes are read but
- thrown away.
+#define GETNLINE_NO_LIMIT ((size_t) -1)
+
+/* Read into a buffer *LINEPTR returned from malloc (or NULL),
+ pointing to *LINESIZE bytes of space. Store the input bytes
+ starting at *LINEPTR + OFFSET, and null-terminate them. Reallocate
+ the buffer as necessary, but if NMAX is not GETNLINE_NO_LIMIT
+ then do not allocate more than NMAX bytes; if the line is longer
+ than that, read and discard the extra bytes. Stop reading after
+ after the first occurrence of DELIM1 or DELIM2, whichever comes
+ first; a delimiter equal to EOF stands for no delimiter. Read the
+ input bytes from STREAM.