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+C
+C                                                                               
+C +-----------------------------------------------------------------+           
+C |                                                                 |           
+C |                Copyright (C) 1986 by UCAR                       |           
+C |        University Corporation for Atmospheric Research          |           
+C |                    All Rights Reserved                          |           
+C |                                                                 |           
+C |                 NCARGRAPHICS  Version 1.00                      |           
+C |                                                                 |           
+C +-----------------------------------------------------------------+           
+C                                                                               
+C                                                                               
+C ---------------------------------------------------------------------
+C
+      SUBROUTINE AGSRCH (TPID,IPID,IKWL,TKWL)
+C
+      CHARACTER*(*) TPID,TKWL
+C
+C The routine AGSRCH is used by AGSCAN to search a parameter identifier
+C for the next keyword and return the index of that keyword in a list of
+C keywords.  It has the following arguments.
+C
+C -- TPID is the parameter identifier, a character string.
+C
+C -- IPID is the index of the last character examined in TPID.  It is
+C    updated by AGSRCH to point to the first slash or period following
+C    the next keyword.
+C
+C -- IKWL is returned containing the index (in the keyword list) of the
+C    next keyword in the parameter identifier (list length, plus one,
+C    if the keyword is not found in the list).
+C
+C -- TKWL is the keyword list - 4*LKWL characters in all.
+C
+C ICHR is used to hold up to four characters of a keyword.
+C
+      CHARACTER*4 ICHR
+C
+C LPID is the assumed maximum length of a parameter identifier.
+C
+      DATA LPID / 100 /
+C
+C Compute the number of 4-character keywords in the keyword list.
+C
+      LKWL=LEN(TKWL)/4
+C
+C Find the next non-blank in the parameter identifier.
+C
+  101 IPID=IPID+1
+      IF (IPID.GT.LPID) GO TO 107
+      IF (TPID(IPID:IPID).EQ.' ') GO TO 101
+C
+C Pick up at most four characters of the keyword, stopping on the first
+C blank, slash, or period encountered.
+C
+      NCHR=0
+C
+  102 IF (TPID(IPID:IPID).EQ.' '.OR.
+     +    TPID(IPID:IPID).EQ.'/'.OR.
+     +    TPID(IPID:IPID).EQ.'.') GO TO 103
+C
+      NCHR=NCHR+1
+      ICHR(NCHR:NCHR)=TPID(IPID:IPID)
+C
+      IPID=IPID+1
+C
+      IF (NCHR.LT.4) GO TO 102
+C
+C If the keyword found has zero length, error.
+C
+  103 IF (NCHR.EQ.0) GO TO 107
+C
+C Scan ahead for the next slash or period.
+C
+  104 IF (TPID(IPID:IPID).EQ.'/'.OR.TPID(IPID:IPID).EQ.'.') GO TO 105
+C
+      IPID=IPID+1
+      IF (IPID.GT.LPID) GO TO 107
+      GO TO 104
+C
+C Search the keyword list for the keyword found.
+C
+  105 DO 106 I=1,LKWL
+        IKWL=I
+        ISTR=(I-1)*4+1
+        IEND=(I-1)*4+NCHR
+        IF (ICHR(1:NCHR).EQ.TKWL(ISTR:IEND)) RETURN
+  106 CONTINUE
+C
+C Keyword not found - set IKWL to impossible value and return.
+C
+  107 IKWL=LKWL+1
+      RETURN
+C
+      END