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Fix PFLINK mechanism for uppercase float conversion specifiers (#796)

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_PFLINK is supposed to automatically pull in required functions for
specific conversion specifiers. However, it fails to do so for the F,
G and E conversion specifiers.

This means that, for example, the following program:

 #include <stdio.h>

int main()
{
    printf("%F %G %E\n", .0, .0, .0);
}

fails to run correctly, printing "? ? ?" instead of
"0.000000 0 0.000000E+00".

This patch fixes this.
This commit is contained in:
Gabriel Ravier 2023-03-30 04:18:59 +02:00 • committed by GitHub
parent 669b4c5f19
commit 36f52ea687
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 137 additions and 13 deletions
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26
libc/fmt/pflink.h
View file

@ -12,19 +12,19 @@
*/
#define PFLINK(...) _PFLINK(__VA_ARGS__)
#define _PFLINK(FMT, ...) \
({ \
if (___PFLINK(FMT, strpbrk, "faAeg")) STATIC_YOINK("__fmt_dtoa"); \
if (___PFLINK(FMT, strpbrk, "cmrqs")) { \
if (___PFLINK(FMT, strstr, "%m")) STATIC_YOINK("strerror"); \
if (___PFLINK(FMT, strstr, "%*") || \
___PFLINK(FMT, strpbrk, "0123456789")) { \
STATIC_YOINK("strnwidth"); \
STATIC_YOINK("strnwidth16"); \
STATIC_YOINK("wcsnwidth"); \
} \
} \
FMT; \
#define _PFLINK(FMT, ...) \
({ \
if (___PFLINK(FMT, strpbrk, "fFaAeEgG")) STATIC_YOINK("__fmt_dtoa"); \
if (___PFLINK(FMT, strpbrk, "cmrqs")) { \
if (___PFLINK(FMT, strstr, "%m")) STATIC_YOINK("strerror"); \
if (___PFLINK(FMT, strstr, "%*") || \
___PFLINK(FMT, strpbrk, "0123456789")) { \
STATIC_YOINK("strnwidth"); \
STATIC_YOINK("strnwidth16"); \
STATIC_YOINK("wcsnwidth"); \
} \
} \
FMT; \
})
#define SFLINK(...) _SFLINK(__VA_ARGS__)