61 lines
2.4 KiB
C
61 lines
2.4 KiB
C
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#ifndef COSMOPOLITAN_LIBC_FMT_PFLINK_H_
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#define COSMOPOLITAN_LIBC_FMT_PFLINK_H_
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#include "libc/dce.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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#ifndef __STRICT_ANSI__
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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(FMT) \
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({ \
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if (___PFLINK(FMT, strpbrk, "bxdinupo")) STATIC_YOINK("ntoa"); \
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if (___PFLINK(FMT, strpbrk, "fFgGaA")) STATIC_YOINK("ftoa"); \
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if (___PFLINK(FMT, strpbrk, "cmrqs")) { \
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STATIC_YOINK("stoa"); \
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if (___PFLINK(FMT, strchr, '#')) STATIC_YOINK("kCp437"); \
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if (___PFLINK(FMT, strstr, "%m")) STATIC_YOINK("strerror"); \
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if (!IsTiny() && (___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(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_s"); \
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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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!isconstant(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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#pragma GCC diagnostic ignored "-Wformat-security"
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#endif /* __GNUC__ + 0 < 6 */
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#else
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#define PFLINK(FMT) FMT
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#define SFLINK(FMT) FMT
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#endif /* __STRICT_ANSI__ */
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_FMT_PFLINK_H_ */
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