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#include "numbers.h"
int char_to_number(char *st, int *valid)
{
int whattype = 0, result = 0;
*valid = 0;
if (*st == '0') {
st++;
if (*st == 'x') {
whattype = 1;
st++;
} else if (*st) {
whattype = 2;
} else {
*valid = 1;
return 0;
}
}
while (*st) {
switch (whattype) {
case 0:
if ((*st < '0') || (*st > '9')) {
return 0;
}
result *= 10;
result += *st - '0';
break;
case 1:
if (((*st < '0') || (*st > '9')) && ((*st < 'A') || (*st > 'F'))
&& ((*st < 'a') || (*st > 'f'))) {
return 0;
}
result *= 16;
if ((*st >= '0') && (*st <= '9')) {
result += *st - '0';
} else if ((*st >= 'A') && (*st <= 'F')) {
result += *st - 'A' + 10;
} else {
result += *st - 'a' + 10;
}
break;
case 2:
if ((*st < '0') || (*st > '7')) {
return 0;
}
result *= 8;
result += *st - '0';
break;
}
st++;
}
*valid = 1;
return result;
}
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