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36f52ea687
_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.
63 lines
2.7 KiB
C
63 lines
2.7 KiB
C
#ifndef COSMOPOLITAN_LIBC_FMT_PFLINK_H_
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#define COSMOPOLITAN_LIBC_FMT_PFLINK_H_
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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/**
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* @fileoverview builtin+preprocessor+linker tricks for printf/scanf.
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*
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* Your printf() function only requires that you pay for what you use.
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* These macros ensure that its code size starts at under 4kb, growing
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* to about 40kb for a fully-loaded implementation. This works best when
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* format strings are constexprs that only contain directives.
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*/
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#define PFLINK(...) _PFLINK(__VA_ARGS__)
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#define _PFLINK(FMT, ...) \
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({ \
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if (___PFLINK(FMT, strpbrk, "fFaAeEgG")) STATIC_YOINK("__fmt_dtoa"); \
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if (___PFLINK(FMT, strpbrk, "cmrqs")) { \
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if (___PFLINK(FMT, strstr, "%m")) STATIC_YOINK("strerror"); \
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if (___PFLINK(FMT, strstr, "%*") || \
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___PFLINK(FMT, strpbrk, "0123456789")) { \
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STATIC_YOINK("strnwidth"); \
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STATIC_YOINK("strnwidth16"); \
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STATIC_YOINK("wcsnwidth"); \
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} \
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} \
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FMT; \
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})
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#define SFLINK(...) _SFLINK(__VA_ARGS__)
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#define _SFLINK(FMT) \
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({ \
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if (___PFLINK(FMT, strchr, 'm')) { \
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STATIC_YOINK("malloc"); \
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STATIC_YOINK("calloc"); \
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STATIC_YOINK("free"); \
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STATIC_YOINK("__grow"); \
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} \
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FMT; \
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})
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#if __GNUC__ + 0 < 4 || defined(__llvm__)
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#define ___PFLINK(FMT, FN, C) 1
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#else
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#define ___PFLINK(FMT, FN, C) \
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!__builtin_constant_p(FMT) || ((FMT) && __builtin_##FN(FMT, C) != NULL)
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#endif
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#if defined(__GNUC__) && __GNUC__ < 6
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/*
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* Compilers don't understand the features we've added to the format
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* string DSL, such as c string escaping, therefore we can't use it.
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* Ideally compilers should grant us more flexibility to define DSLs
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*
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* The recommended approach to turning this back on is `CFLAGS=-std=c11`
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* which puts the compiler in __STRICT_ANSI__ mode, which Cosmopolitan
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* respects by disabling all the esoteric tuning in headers like this.
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*/
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#pragma GCC diagnostic ignored "-Wformat-security"
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#endif /* __GNUC__ + 0 < 6 */
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_FMT_PFLINK_H_ */
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