Groups | Search | Server Info | Login | Register

Groups > comp.lang.awk > #9976

substr() - copying or not copying, that is here the question.

From Janis Papanagnou <janis_papanagnou+ng@hotmail.com>
Newsgroups comp.lang.awk
Subject substr() - copying or not copying, that is here the question.
Date 2025-05-31 18:12 +0200
Organization A noiseless patient Spider
Message-ID <101f9oo$18edp$1@dont-email.me> (permalink)

Show all headers | View raw

In the context   p=index(substr(t,s),r)
it would not be necessary to copy the substr(t,s),
the index() function could operate on the original
using some access "descriptor" (say, a pointer and
a length) in read-only mode.

Will (GNU) Awk do a copy of the data value or does
it use a read-only descriptor access to the already
existing substring of variable "t"?

Currently I'm playing with some huge data and copies
of MB sized data is costly (if it's repeatedly done
with various substr() subscripts).

Janis

Back to comp.lang.awk | Previous | Next — Next in thread | Find similar

Thread

substr() - copying or not copying, that is here the question. Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-05-31 18:12 +0200
  Re: substr() - copying or not copying, that is here the question. mack@the-knife.org (Mack The Knife) - 2025-05-31 19:07 +0000
    Re: substr() - copying or not copying, that is here the question. Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-06-01 00:16 +0200
      Re: substr() - copying or not copying, that is here the question. Ben Bacarisse <ben@bsb.me.uk> - 2025-06-01 11:42 +0100
        Re: substr() - copying or not copying, that is here the question. Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-06-01 13:43 +0200
          Re: substr() - copying or not copying, that is here the question. gazelle@shell.xmission.com (Kenny McCormack) - 2025-06-01 12:06 +0000
            Re: substr() - copying or not copying, that is here the question. Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-06-01 15:27 +0200
        Re: substr() - copying or not copying, that is here the question. gazelle@shell.xmission.com (Kenny McCormack) - 2025-06-01 11:53 +0000
          Re: substr() - copying or not copying, that is here the question. Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-06-01 15:47 +0200
            Re: substr() - copying or not copying, that is here the question. gazelle@shell.xmission.com (Kenny McCormack) - 2025-06-01 14:17 +0000
              Re: substr() - copying or not copying, that is here the question. Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-06-08 00:01 +0200
      Re: substr() - copying or not copying, that is here the question. mack@the-knife.org (Mack The Knife) - 2025-06-03 06:56 +0000
        Re: substr() - copying or not copying, that is here the question. gazelle@shell.xmission.com (Kenny McCormack) - 2025-06-03 11:04 +0000
        Re: substr() - copying or not copying, that is here the question. Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-06-08 00:05 +0200
          Re: substr() - copying or not copying, that is here the question. mack@the-knife.org (Mack The Knife) - 2025-06-08 12:35 +0000
            Re: substr() - copying or not copying, that is here the question. Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-06-11 11:07 +0200
              Meta chat (Was: substr() - copying or not copying, that is here the question.) gazelle@shell.xmission.com (Kenny McCormack) - 2025-06-11 12:11 +0000
    Re: substr() - copying or not copying, that is here the question. Kaz Kylheku <643-408-1753@kylheku.com> - 2025-06-01 00:01 +0000

csiph-web