Help with assigning point to vector polygons

[Duc Nygen]

Dear grassp's:
  I have a simple problem that some of the 'guru' grassers out there can help.  I
have an ascii vector file which contains all areas (A nnn) where I need to assign
label whose content keeps information which I need to use to analyse among the maps.
An example is:
RGANIZATION:  Comsearch
DIGIT DATE:    09/09/92
DIGIT NAME:    48113
MAP NAME:      fixed up
MAP DATE:      338 15538
OTHER INFO:    modified by duc kim nguyen
MAP SCALE:     24000
ZONE:          0
WEST EDGE:    -126.0
EAST EDGE:     -66.0
SOUTH EDGE:     24.0
NORTH EDGE:     49.5
MAP THRESH:      0.0
VERTI:
A     57 358562 "0112      "
   32.6417007  -96.8059006
   32.6417007  -96.8060989
   32.6417007  -96.8084030
   32.6416016  -96.8140030
   32.6413994  -96.8210983
   32.6413002  -96.8226013
   32.6413002  -96.8227997
   32.6517982  -96.8227997
   32.6637993  -96.8225021
   32.6739006  -96.8224030
   32.6743011  -96.8224030
   32.6795998  -96.8224030
   32.6860008  -96.8221970
   32.6865997  -96.8221970
   32.6865997  -96.8220978
   32.6865005  -96.8217010
   32.6864014  -96.8214035
   32.6861992  -96.8209991
   32.6861000  -96.8209000
   32.6856003  -96.8201981
   32.6853981  -96.8197021
   32.6846008  -96.8183975
   32.6839981  -96.8175964
   32.6837006  -96.8170013
   32.6834984  -96.8163986
   32.6833992  -96.8158035
   32.6832008  -96.8151016
   32.6832008  -96.8143005
   32.6832008  -96.8136978
   32.6832008  -96.8134995
   32.6833000  -96.8127975
   32.6833992  -96.8121033
   32.6833992  -96.8115997
   32.6834984  -96.8113022
   32.6834984  -96.8105011
   32.6834984  -96.8100967
   32.6833000  -96.8096008
   32.6832008  -96.8093033
   32.6828003  -96.8087006
   32.6824989  -96.8080978
   32.6822014  -96.8077011
   32.6819992  -96.8072968
   32.6817017  -96.8068008
   32.6815987  -96.8059006
   32.6815987  -96.8052979
   32.6815987  -96.8049011
   32.6817017  -96.8041992
   32.6818008  -96.8039017
   32.6814995  -96.8040009
   32.6814003  -96.8041992
   32.6806984  -96.8046036
   32.6803017  -96.8049011
   32.6803017  -96.8050995
   32.6800003  -96.8051987
   32.6800995  -96.8057022
   32.6430016  -96.8059006
   32.6417007  -96.8059006

now I need to read this file and generate a label and attribute files such as:
A -96.8133507000   32.663949950     358562

and

# 358562 categories
MAP NAME:      fixed up

0.0 0.0 0.0 0.0
358562: info(3402,1113,34537,2.8,63,531 "0112      ")

and the algorithm I used to generate the point is a simple one: find its maximum
vertices, and compute the mid-point; then use the dig_point_in_poly to see if it is in
otherwise find the most western point and its neighbours to triangulate:
		    *
		   /|
		  / |<--- point chosen
		 /  |
		*---*
it seems that these two strategies are good enuf, however when v.support sometimes tells
me that some of the points are NOT in:

PNT_TO_AREA failed: (-96.8133507, 32.663949) (Category 358562)

What got me is that the same code in mapdev to do the point_in_poly is used in mine to
determine whether such point is valid (my code it is, grass says it's not).  The other
question is whether grass has already such capability in some programs which I can use
to automagically have them assigned / generated with category number.

Any way, I wrote an X program to display the polygon and point chosen and found that the
points that grass say PNT_TO_AREA failed are perfectly in the middle of the polygon (??!).

Any help is appreciated.
cheers
duc at comsearch.com