67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
#include <stdio.h>
|
|
#include <stdarg.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
char *__scanf_buffer = 0;
|
|
|
|
int virtual_getc_con(void *sp, const void *obj)
|
|
// get next chat from string obj, save point is ptr to string char ptr
|
|
{
|
|
int ch;
|
|
const char**spc= (const char**)sp;
|
|
if (!spc) return EOF; // error
|
|
|
|
if (!*spc) *spc = __scanf_buffer; // first call, init savepoint
|
|
|
|
while (!**spc) // need to read more
|
|
{
|
|
if(!gets(__scanf_buffer)) return EOF;
|
|
*spc = __scanf_buffer;
|
|
strcat(__scanf_buffer,"\n"); // imitate delimiter
|
|
}
|
|
if (**spc == 26 || **spc == 3) // ^C ^Z end of scan, clear buffer
|
|
{
|
|
*spc = __scanf_buffer;
|
|
*__scanf_buffer = 0;
|
|
return EOF; // ^C ^Z
|
|
}
|
|
|
|
ch = **spc; (*spc)++ ;
|
|
|
|
//printf("getc '%c'[%d];", ch, ch);
|
|
return ch;
|
|
}
|
|
|
|
void virtual_ungetc_con(void *sp, int c, const void *obj)
|
|
// if can, one step back savepoint in s
|
|
{
|
|
const char**spc= (const char**)sp;
|
|
|
|
if (spc && *spc > __scanf_buffer) (*spc)--;
|
|
//printf("Ungetc '%c'[%d];", c, c);
|
|
}
|
|
|
|
|
|
int vscanf ( const char * format, va_list arg )
|
|
{
|
|
return format_scan(NULL, format, arg, &virtual_getc_con, &virtual_ungetc_con);
|
|
};
|
|
|
|
int scanf ( const char * format, ...)
|
|
{
|
|
va_list arg;
|
|
int n;
|
|
va_start(arg, format);
|
|
|
|
if(__scanf_buffer == NULL) __scanf_buffer = malloc(4096);
|
|
if(__scanf_buffer == NULL) return -3;
|
|
|
|
*__scanf_buffer = 0;
|
|
n = vscanf(format, arg);
|
|
|
|
va_end(arg);
|
|
return n;
|
|
}
|
|
|
|
|