NAME
index, rindex, lnblnk, len - get index or length of sub-
string
SYNOPSIS/USAGE
CHARACTER*(*) string, substr
n = INDEX (string, substr)
INTEGER*4 FUNCTION rindex
CHARACTER*(*) string, substr
n = rindex (string, substr)
INTEGER*4 FUNCTION lnblnk
CHARACTER*(*) string
n = lnblnk (string)
CHARACTER*(*) string
n = LEN (string)
DESCRIPTION
INDEX(a1,a2) returns the index of the first occurrence of
string a2 in string a1, or zero if it does not occur
(intrinsic function).
rindex(a1,a2) returns the index of the last occurrence of
string a2 in string a1, or zero if it does not occur.
lnblnk( a1 ) returns the index of the last non-blank charac-
ter in a1. This function is useful since all f77 character
objects are of fixed length and blank-padded.
LEN returns the declared size of the character string argu-
ment (intrinsic function).
NOTES
When compiling for 64-bit environments (with compiler option
-xarch=v9 or v9a), routines len, index, rindex, and lnblnk
could return values greater than the data range of INTEGER*4
data when applied to very large character strings (greater
than 2 Gbytes). In this situation, these functions must be
declared INTEGER*8, as well as the variables receiving their
results.
EXAMPLE
Example: LEN(), INDEX(), rindex() , lnblnk():
CHARACTER s*32 / '123456789 123456789 1234' /
INTEGER*4 declen, first, last, lnblnk, rindex
declen = LEN( s )
first = INDEX( s, '123' )
last = rindex( s, '123' )
lastnb = lnblnk( s )
PRINT*, declen, lastnb, first, last
END
demo% f77 -silent tindex.f
demo% a.out
32 24 1 21
demo%
In the above example, declen is 32, not 24. This is the
declared length of the character variable, not the length of
the string it contains.
FILES
libfui.a