| #ifndef SHGETC_H |
| #define SHGETC_H |
| |
| #include <stdio.h> |
| #include <wchar.h> |
| |
| // Custom stream abstraction, replaces the Musl FILE type for |
| // the purpose of scanning integers and floating points. |
| // |rstart| is the start of the input string. |
| // |rend| is the first wchar_t after it. |
| // |rpos| is the current reading position. |
| // |extra_eof| is a counter of positions past EOF. Needed because the |
| // scanning routines more or less assume an infinite input string, with |
| // EOF being returned when shgetc() is being called past the real end |
| // of the input stream. |
| struct fake_file_t { |
| const wchar_t *rstart, *rpos, *rend; |
| int extra_eof; |
| }; |
| |
| // Initialize fake_file_t structure from a wide-char string. |
| void shinit_wcstring(struct fake_file_t *, const wchar_t *wcs); |
| |
| // Get next character from string. This convers the wide character to |
| // an 8-bit value, which will be '@' in case of overflow. Returns EOF (-1) |
| // in case of end-of-string. |
| int shgetc(struct fake_file_t *); |
| |
| // Back-track one character, must not be called more times than shgetc() |
| void shunget(struct fake_file_t *); |
| |
| // This will be called with a value of 0 for |lim| to force rewinding |
| // to the start of the string. In Musl, this is also used in different |
| // parts of the library to impose a local limit on the number of characters |
| // that can be retrieved through shgetc(), but this is not necessary here. |
| void shlim(struct fake_file_t *, off_t lim); |
| |
| // Return the number of input characters that were read so far. |
| off_t shcnt(struct fake_file_t *); |
| |
| #endif // SHGETC_H |
