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Add the uppercase B conversion specifier to printf (#1300)

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The (uppercase) B conversion specifier is specified by the C standard to
have the same behavior as the (lowercase) b conversion specifier, except
that whenever the # flag is used, the (uppercase) B conversion specifier
alters a nonzero result by prefixing it with "0B", instead of with "0b".

This commit adds this conversion specifier alongside a few tests for it.
This commit is contained in:
Gabriel Ravier 2024-09-26 13:27:45 +02:00 • committed by GitHub
parent 518eabadf5
commit 333c3d1f0a
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GPG key ID: B5690EEEBB952194
2 changed files with 95 additions and 114 deletions
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3
libc/stdio/fmt.c
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@ -1090,9 +1090,10 @@ int __fmt(void *fn, void *arg, const char *format, va_list va, int *wrote) {
case 'x':
log2base = 4;
goto FormatNumber;
case 'B':
case 'b':
log2base = 1;
alphabet = "0123456789abcdefpb";
alphabet = (d == 'b' ? "0123456789abcdefpb" : "0123456789ABCDEFPB");
goto FormatNumber;
case 'o':
log2base = 3;