| 1,11 → 1,45 |
|---|
| #include <stdio.h> |
| #include <stdarg.h> |
| |
| int virtual_getc_str(void *sp, const void *obj) |
| // get next chat from string obj, save point is ptr to string char ptr |
| { |
| int ch; |
| const char *s = (const char *)obj; |
| const char**spc= (const char**)sp; |
| if (!s || !spc) return EOF; // error |
| |
| if (!*spc) *spc = s; // first call, init savepoint |
| |
| if (!**spc) return EOF; // EOS |
| |
| ch = **spc; (*spc)++ ; |
| |
| return ch; |
| } |
| |
| void virtual_ungetc_str(void *sp, int c, const void *obj) |
| // if can, one step back savepoint in s |
| { |
| const char *s = (const char *)obj; |
| const char**spc= (const char**)sp; |
| |
| if (s && spc && *spc > s) (*spc)--; |
| } |
| |
| int vsscanf ( const char * s, const char * format, va_list arg ) |
| { |
| return format_scan(s, format, arg, &virtual_getc_str, &virtual_ungetc_str); |
| }; |
| |
| int sscanf(const char * s, const char * format, ...) |
| { |
| va_list arg; |
| int n; |
| va_start(arg, format); |
| |
| n = vsscanf(s, format, arg); |
| |
| va_end(arg); |
| return n; |
| } |