musl/src/internal/shgetc.h

#include "stdio_impl.h"

void __shlim(FILE *, off_t);
int __shgetc(FILE *);

#define shcnt(f) ((f)->shcnt + ((f)->rpos - (f)->rend))
#define shlim(f, lim) __shlim((f), (lim))
#define shgetc(f) (((f)->rpos < (f)->shend) ? *(f)->rpos++ : __shgetc(f))
#define shunget(f) ((f)->shend ? (void)(f)->rpos-- : (void)0)
add "scan helper getc" and rework strtod, etc. to use it the immediate benefit is a significant debloating of the float parsing code by moving the responsibility for keeping track of the number of characters read to a different module. by linking shgetc with the stdio buffer logic, counting logic is defered to buffer refill time, keeping the calls to shgetc fast and light. in the future, shgetc will also be useful for integrating the new float code with scanf, which needs to not only count the characters consumed, but also limit the number of characters read based on field width specifiers. shgetc may also become a useful tool for simplifying the integer parsing code. 2012-04-10 21:47:37 -04:00			`#include "stdio_impl.h"`

			`void __shlim(FILE *, off_t);`
			`int __shgetc(FILE *);`

use macros instead of inline functions in shgetc.h at -Os optimization level, gcc refuses to inline these functions even though the inlined code would roughly the same size as the function call, and much faster. the easy solution is to make them into macros. 2012-04-13 03:59:36 -04:00			`#define shcnt(f) ((f)->shcnt + ((f)->rpos - (f)->rend))`
			`#define shlim(f, lim) __shlim((f), (lim))`
			`#define shgetc(f) (((f)->rpos < (f)->shend) ? *(f)->rpos++ : __shgetc(f))`
fix broken shgetc limiter logic (wasn't working) 2012-04-16 01:55:37 -04:00			`#define shunget(f) ((f)->shend ? (void)(f)->rpos-- : (void)0)`