HP TACL User Manual

Processing Arguments
Developing TACL Routines
3–10 107365 Tandem Computers Incorporated
Figure 3-3. Returning a Set of Characters From a Variable
?SECTION substring ROUTINE
#FRAME
#PUSH bgn end var
#IF [#ARGUMENT/VALUE var/VARIABLE]
#IF [#ARGUMENT/VALUE bgn/NUMBER]
#IF [#ARGUMENT/VALUE end/NUMBER]
#IF [#ARGUMENT END]
[#RESULT [#CHARGET [var] [bgn] TO [end]]]
#UNFRAME
Note This routine does not check to make sure that number2 is a greater number than number1 . For
more thorough argument validation, include that check.
Use the routine in Figure 3-4, scan, to scan for text and retrieve the first position,
starting at a specified position, where the text occurs in the variable. The syntax is:
scan variable number text
Do not enclose text in double quotes unless the quotes are part of the text.
Figure 3-4. Searching for Text
?SECTION scan ROUTINE
#FRAME
#PUSH var num txt
#IF [#ARGUMENT/VALUE var/VARIABLE]
#IF [#ARGUMENT/VALUE num/NUMBER]
#IF [#ARGUMENT/VALUE txt/TEXT]
#IF [#ARGUMENT END]
[#RESULT [#CHARFINDV [var] [num] txt]]
#UNFRAME
Note If you do not include square brackets around the variable names in the #CHARxxx calls, TACL uses the
declared variables (var and num) instead of the variables passed to the routine and referenced by var
and num.
Use the routine in Figure 3-5, length, to retrieve the number of characters in a
variable (including end-of-line characters). The syntax is:
length variable

HP TACL Specifications

General

Brand	HP
Model	TACL
Category	Software
Language	English