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/*
* BIRD Library -- Parse numbers
*
* (c) 2019 Maria Matejka <mq@jmq.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include "nest/bird.h"
#include "lib/string.h"
#include <errno.h>
#define ULI_MAX_DIV10 (UINT64_MAX / 10)
#define ULI_MAX_MOD10 (UINT64_MAX % 10)
u64
bstrtoul10(const char *str, char **end)
{
u64 out = 0;
for (*end = (char *) str; (**end >= '0') && (**end <= '9'); (*end)++) {
u64 digit = **end - '0';
if ((out > ULI_MAX_DIV10) ||
(out == ULI_MAX_DIV10) && (digit > ULI_MAX_MOD10)) {
errno = ERANGE;
return UINT64_MAX;
}
out *= 10;
out += (**end) - '0';
}
return out;
}
u64
bstrtoul16(const char *str, char **end)
{
u64 out = 0;
for (int i=0; i<=(64/4); i++) {
switch (str[i]) {
case '0' ... '9':
out *= 16;
out += str[i] - '0';
break;
case 'a' ... 'f':
out *= 16;
out += str[i] + 10 - 'a';
break;
case 'A' ... 'F':
out *= 16;
out += str[i] + 10 - 'A';
break;
default:
*end = (char *) &(str[i]);
return out;
}
}
errno = ERANGE;
return UINT64_MAX;
}
static int
fromxdigit(char c)
{
switch (c)
{
case '0' ... '9':
return c - '0';
case 'a' ... 'f':
return c + 10 - 'a';
case 'A' ... 'F':
return c + 10 - 'A';
default:
return -1;
}
}
int
bstrhextobin(const char *s, byte *b)
{
int len = 0;
int hi = 0;
for (; *s; s++)
{
int v = fromxdigit(*s);
if (v < 0)
{
if (strchr(" :-", *s) && !hi)
continue;
else
return -1;
}
if (len == INT32_MAX)
return -1;
if (b)
{
if (!hi)
b[len] = (v << 4);
else
b[len] |= v;
}
len += hi;
hi = !hi;
}
return !hi ? len : -1;
}
static char
toxdigit(uint b)
{
if (b < 10)
return ('0' + b);
else if (b < 16)
return ('a' + b - 10);
else
return 0;
}
int
bstrbintohex(const byte *b, size_t len, char *buf, size_t size, char delim)
{
ASSERT(size >= 6);
char *bound = buf + size - 3;
size_t i;
for (i = 0; i < len; i++)
{
if (buf > bound)
{
strcpy(buf - 4, "...");
return -1;
}
uint x = b[i];
buf[0] = toxdigit(x >> 4);
buf[1] = toxdigit(x & 0xF);
buf[2] = delim;
buf += 3;
}
buf[i ? -1 : 0] = 0;
return 0;
}
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