[Bug 2083131] Re: Bash's builtin command "printf" has a grave functionality bug - fails to print the format like "%.2f .1"

[Julian Andres Klode]

Tagging foundations for sponsoring

** Tags added: foundations-todo

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https://bugs.launchpad.net/bugs/2083131

Title:
  Bash's builtin command "printf" has a grave functionality bug - fails
  to print the format like "%.2f .1"

Status in bash package in Ubuntu:
  Confirmed
Status in bash source package in Oracular:
  Confirmed
Status in bash source package in Plucky:
  Confirmed
Status in bash package in Debian:
  Confirmed

Bug description:
  [ Impact ]

  Programs relying on the builtin printf function of bash stop working
  correctly when trying to format numbers with %f.

  [ Test Plan ]

  Run the following command, which currently returns "-nan" while it should return 52.12:
   
  $ bash -c "printf %.2f 52.123"

  [ Where problems could occur ]

  Unknown regressions in the formatting after applying the patch.

  [ Original Bug Report ]

  As reported in the upstream Debian Linux:
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1078556
  Bash's builtin command "printf" has a grave functionality bug - fails to print the format like "%.2f .1".

  # bash --version
  GNU bash, version 5.2.32(1)-release (x86_64-pc-linux-gnu)
  Copyright (C) 2022 Free Software Foundation, Inc.
  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

  This is free software; you are free to change and redistribute it.
  There is NO WARRANTY, to the extent permitted by law.

  # printf "%.2f\n" 0.1
  nan

  As mentioned in the above URL, upstream's configure-strtold-check patch:
  https://bugs.debian.org/cgi-bin/bugreport.cgi?att=1;bug=1078556;filename=configure-strtold-check;msg=20

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