strsuc.f

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C> @file
C> @brief Remove leading and trailing blanks from a character string

C> This subroutine removes leading and trailing blanks from a
C> character string.  The string may not contain any embedded blanks.
C>
C> @author J. Woollen
C> @date 1994-01-06
C>
C> @param[in]  STR1 -- character*(*): String
C> @param[out] STR2 -- character*(*): Copy of STR1 with leading and
C>                     trailing blanks removed
C> @param[out] LENS -- integer: Length of STR2
C>                     - -1 = STR1 contained embedded blanks
C>
C> <b>Program History Log:</b>
C> | Date | Programmer | Comments |
C> | -----|------------|----------|
C> | 1994-01-06 | J. Woollen | Original author
C> | 2003-11-04 | J. Ator    | Added documentation
C> | 2009-04-21 | J. Ator    | Use errwrt()
C>
      SUBROUTINE strsuc(STR1,STR2,LENS)

      CHARACTER*(*) str1,str2

      COMMON /quiet / iprt

C-----------------------------------------------------------------------
C-----------------------------------------------------------------------

      lens = 0
      lstr = len(str1)

C  FIND THE FIRST NON-BLANK IN THE INPUT STRING
C  --------------------------------------------

      DO i=1,lstr
      IF(str1(i:i).NE.' ') goto 2
      ENDDO
      goto 100

C     Now, starting with the first non-blank in the input string,
C     copy characters from the input string into the output string
C     until reaching the next blank in the input string.

2     DO j=i,lstr
      IF(str1(j:j).EQ.' ') goto 3
      lens = lens+1
      str2(lens:lens) = str1(j:j)
      ENDDO
      goto 100

C     Now, continuing on within the input string, make sure that
C     there are no more non-blank characters.  If there are, then
C     the blank at which we stopped copying from the input string
C     into the output string was an embedded blank.

3     DO i=j,lstr
      IF(str1(i:i).NE.' ') lens = -1
      ENDDO

      IF(lens.EQ.-1 .AND. iprt.GE.0)  THEN
      CALL errwrt('++++++++++++++BUFR ARCHIVE LIBRARY+++++++++++++++++')
      CALL errwrt('BUFRLIB: STRSUC - INPUT STRING:')
      CALL errwrt(str1)
      CALL errwrt('CONTAINS ONE OR MORE EMBEDDED BLANKS')
      CALL errwrt('++++++++++++++BUFR ARCHIVE LIBRARY+++++++++++++++++')
      CALL errwrt(' ')
      ENDIF

C  EXIT
C  ----

100   RETURN
      END