1#ifndef SHGETC_H 2#define SHGETC_H 3 4#include <stdio.h> 5#include <wchar.h> 6 7// Custom stream abstraction, replaces the Musl FILE type for 8// the purpose of scanning integers and floating points. 9// |rstart| is the start of the input string. 10// |rend| is the first wchar_t after it. 11// |rpos| is the current reading position. 12// |extra_eof| is a counter of positions past EOF. Needed because the 13// scanning routines more or less assume an infinite input string, with 14// EOF being returned when shgetc() is being called past the real end 15// of the input stream. 16struct fake_file_t { 17 const wchar_t *rstart, *rpos, *rend; 18 int extra_eof; 19}; 20 21// Initialize fake_file_t structure from a wide-char string. 22void shinit_wcstring(struct fake_file_t *, const wchar_t *wcs); 23 24// Get next character from string. This convers the wide character to 25// an 8-bit value, which will be '@' in case of overflow. Returns EOF (-1) 26// in case of end-of-string. 27int shgetc(struct fake_file_t *); 28 29// Back-track one character, must not be called more times than shgetc() 30void shunget(struct fake_file_t *); 31 32// This will be called with a value of 0 for |lim| to force rewinding 33// to the start of the string. In Musl, this is also used in different 34// parts of the library to impose a local limit on the number of characters 35// that can be retrieved through shgetc(), but this is not necessary here. 36void shlim(struct fake_file_t *, off_t lim); 37 38// Return the number of input characters that were read so far. 39off_t shcnt(struct fake_file_t *); 40 41#endif // SHGETC_H 42