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#include "scan.h"
/**
* @file scan.c
* @author djb
* @ref qmail, ucspi-tcp
* @brief scanning/conversion of strings to different variable types
*/
static long int fromhex(unsigned char c)
{
if (c>='0' && c<='9')
return c-'0';
else if (c>='A' && c<='F')
return c-'A'+10;
else if (c>='a' && c<='f')
return c-'a'+10;
return -1;
}
unsigned int scan_0x(const char *s,unsigned int *u)
{
unsigned int pos = 0;
unsigned long result = 0;
long int c;
while ((c = fromhex((unsigned char) (s[pos]))) >= 0) {
result = (result << 4) + c;
++pos;
}
*u = result;
return pos;
}
unsigned int scan_8long(const char *s,unsigned long *u)
{
unsigned int pos = 0;
unsigned long result = 0;
unsigned long c;
while ((c = (unsigned long) (unsigned char) (s[pos] - '0')) < 8) {
result = result * 8 + c;
++pos;
}
*u = result;
return pos;
}
unsigned int scan_uint(const char *s,unsigned int *u)
{
unsigned int pos;
unsigned long result;
pos = scan_ulong(s,&result);
*u = result;
return pos;
}
unsigned int scan_plusminus(const char *s,register int *sign)
{
if (*s == '+') { *sign = 1; return 1; }
if (*s == '-') { *sign = -1; return 1; }
*sign = 1; return 0;
}
unsigned int scan_long(const char *s,register long *i)
{
int sign;
unsigned long u;
unsigned int len;
len = scan_plusminus(s,&sign); s += len;
len += scan_ulong(s,&u);
if (sign < 0) *i = -u; else *i = u;
return len;
}
unsigned int scan_ulong(const char *s,unsigned long *u)
{
unsigned int pos = 0;
unsigned long result = 0;
unsigned long c;
while ((c = (unsigned long) (unsigned char) (s[pos] - '0')) < 10) {
result = result * 10 + c;
++pos;
}
*u = result;
return pos;
}
unsigned int scan_xlong(const char *s,unsigned long *u)
{
const char *t = s;
int l = 0;
unsigned char c;
while ((c = fromhex(*t)) < 16) {
l = (l<<4)+c;
++t;
}
*u=l;
return t-s;
}
unsigned int scan_xint(const char *s,unsigned int *i)
{
const char *t = s;
unsigned int l = 0;
unsigned char c;
while ((l >> (sizeof(l)*8 - 4)) == 0
&& (c = (unsigned char)fromhex((unsigned char)*t))<16) {
l= (l << 4) + c;
++t;
}
*i = l;
return (unsigned int)(t-s);
}
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