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fmt::sprintf ignores minus flag for char #1682

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rimathia opened this issue May 14, 2020 · 1 comment
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fmt::sprintf ignores minus flag for char #1682

rimathia opened this issue May 14, 2020 · 1 comment

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@rimathia
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rimathia commented May 14, 2020

First of all thanks for the huge amount of work you put into the library (including shepherding it through standardization).

Me and a friend of mine were at a loss to understand why fmt::sprintf ignores the minus flag when formatting a char from a look at the linked https://pubs.opengroup.org/onlinepubs/009695399/functions/fprintf.html (but it is certainly possible we have missed something).

std::printf("X%-5cX", 'a') outputs Xa X (four spaces as expected, but I can't get that to display properly) (tested on recent clang and gcc on godbolt)
whereas fmt::sprintf("X%-5cX", 'a') outputs X aX (also four spaces)

Assuming this behaviour is intentional, should I create a pull request for the documentation of fmt::printf or is this level of detail beyond the scope of the documentation?

@vitaut
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vitaut commented May 14, 2020

why fmt::sprintf ignores the minus flag when formatting a char

No good reason. This needs to be fixed (in code, not documentation). A PR is welcome.

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