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#include <stdio.h>
#include <stdarg.h>
static UBYTE scan_skip(char *s, UBYTE i)
{
oncemore:
while(isspace(s[i]))
i++;
if(s[i] == 0) {
gets(s);
i = 0;
goto oncemore;
}
return i;
}
static UBYTE scan_int(char *s, UBYTE i, UBYTE base, BYTE *nb)
{
BYTE n = 0;
UBYTE j, sign = 0;
switch(s[i])
{
case '-':
sign++;
/* and fall through */
case '+':
++i;
break;
}
while(1) {
if(isdigit(s[i]))
j = s[i] - '0';
else if(isalpha(s[i]))
j = toupper(s[i]) - 'A' + 10;
else
break;
if(j >= base)
break;
n = base * n + j;
i++;
}
*nb = (sign == 0 ? n : -n);
return i;
}
static UBYTE scan_long(char *s, UBYTE i, UBYTE base, WORD *nb)
{
WORD n = 0;
UBYTE j, sign = 0;
switch(s[i])
{
case '-':
sign++;
/* and fall through */
case '+':
++i;
break;
}
while(1) {
if(isdigit(s[i]))
j = s[i] - '0';
else if(isalpha(s[i]))
j = toupper(s[i]) - 'A' + 10;
else
break;
if(j >= base)
break;
n = base * n + j;
i++;
}
*nb = (sign == 0 ? n : -n);
return i;
}
BYTE scanf(char *fmt, ...)
{
va_list ap;
char s[64];
UBYTE i = 0;
BYTE nb = 0;
gets(s);
va_start(ap, fmt);
for(; *fmt; fmt++) {
if(isspace(*fmt))
continue;
i = scan_skip(s, i);
if(*fmt == '%') {
switch(*++fmt) {
case 'c':
/* char */
*va_arg(ap, char *) = s[i++];
break;
case 'd':
/* decimal int */
case 'u':
/* unsigned int */
i = scan_int(s, i, 10, va_arg(ap, BYTE *));
break;
case 'o':
/* octal int */
i = scan_int(s, i, 8, va_arg(ap, BYTE *));
break;
case 'x':
/* hexadecimal int */
i = scan_int(s, i, 16, va_arg(ap, BYTE *));
break;
case 's':
/* string */
{
BYTE j = 0;
char *d = va_arg(ap, char *);
while((d[j++] = s[i++]) != 0)
;
}
break;
case 'l':
/* long */
switch(*++fmt) {
case 'd':
/* decimal long */
case 'u':
/* unsigned long */
i = scan_long(s, i, 10, va_arg(ap, WORD *));
break;
case 'o':
/* octal long */
i = scan_long(s, i, 8, va_arg(ap, WORD *));
break;
case 'x':
/* hexadecimal long */
i = scan_long(s, i, 16, va_arg(ap, WORD *));
break;
}
break;
default:
if(s[i] != *fmt)
return -1;
break;
}
nb++;
} else
if(s[i] != *fmt)
return -1;
}
va_end(ap);
return nb;
}
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