Re: determining length of string

[John Graham-Cumming]

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LeJacq, Jean Pierre wrote:
> Any suggestions on how how to determine the length of
> a string with just GNU Make functions?

characters := A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
characters += a b c d e f g h i j k l m n o p q r s t u v w y z
characters += 0 1 2 3 4 5 6 7 8 9

strlen = $(strip $(eval __temp := $(subst $(sp),x,$1))$(foreach
a,$(characters),$(eval __temp := $$(subst $a,x,$(__temp))))$(eval __temp
:= $(subst x,x ,$(__temp)))$(words $(__temp)))

Then do: $(call strlen,$(X)) to get the length of X.  Clearly, you may
need to augment the definition of characters if the string can contain
characters other than alphanumerics, but I hope that gives you an idea
of how to do it.

> If that is possible, is there a way of trimming a string
> to a desired length at either end?

Left as an exercise for the reader :-)

John.

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