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Re: How to use a temporary file in a portable way

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pozz <pozzugno@gmail.com> writes:

> I understand the more portable and secure method to change the content
> of a file is through creating a temporary file.

You might also consider just reading the whole thing into memory.

<snip>
> [...]  Now the main question of this
> post: how to use (mainly create) the temporary file in a portable way?

Quoting from the C standard:

      FILE *tmpfile(void);

  The tmpfile function creates a temporary binary file that is different
  from any other existing file and that will automatically be removed
  when it is closed or at program termination. If the program terminates
  abnormally, whether an open temporary file is removed is
  implementation-defined. The file is opened for update with "wb+" mode.

<snip>
> How to choose the temporary file name?  How to face the situation when
> the temporary file name already exist?

      char *tmpnam(char *s);

  The tmpnam function generates a string that is a valid file name and
  that is not the same as the name of an existing file.

(again, a quote from the standard).

-- 
Ben.

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How to use a temporary file in a portable way pozz <pozzugno@gmail.com> - 2015-04-09 07:22 +0200
  Re: How to use a temporary file in a portable way Robert Wessel <robertwessel2@yahoo.com> - 2015-04-09 02:15 -0500
  Re: How to use a temporary file in a portable way Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-04-09 11:00 +0100
  Re: How to use a temporary file in a portable way James Kuyper <jameskuyper@verizon.net> - 2015-04-09 08:42 -0400
  Re: How to use a temporary file in a portable way Greg Martin <greg.at.softsprocket@dot.com> - 2015-04-09 15:47 +0000
    Re: How to use a temporary file in a portable way Michael Angelo Ravera <maravera@prodigy.net> - 2015-04-09 14:52 -0700
  Re: How to use a temporary file in a portable way Richard Damon <Richard@Damon-Family.org> - 2015-04-09 23:43 -0400
    Re: How to use a temporary file in a portable way Keith Thompson <kst-u@mib.org> - 2015-04-10 08:29 -0700
      Re: How to use a temporary file in a portable way Richard Damon <Richard@Damon-Family.org> - 2015-04-10 22:31 -0400
  Re: How to use a temporary file in a portable way Nobody <nobody@nowhere.invalid> - 2015-04-10 14:48 +0100

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