ip4.c

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#include "fmt.h"
#include "scan.h"
#include "str.h"
#include "ip.h"
 
unsigned int ip4_fmt(char *s,char ip[4])
{
  unsigned int len;
  unsigned int i;
 
  len = 0;
  i = fmt_ulong(s,(unsigned long) (unsigned char) ip[0]); len += i; if (s) s += i;
  if (s) { *s++ = '.'; } ++len;
  i = fmt_ulong(s,(unsigned long) (unsigned char) ip[1]); len += i; if (s) s += i;
  if (s) { *s++ = '.'; } ++len;
  i = fmt_ulong(s,(unsigned long) (unsigned char) ip[2]); len += i; if (s) s += i;
  if (s) { *s++ = '.'; } ++len;
  i = fmt_ulong(s,(unsigned long) (unsigned char) ip[3]); len += i; if (s) s += i;
  return len;
}
 
unsigned int ia4_fmt(char *s,char ip[4])
{
  unsigned int i;
  unsigned int len;
 
  len = 0;
  i = fmt_ulong(s,(unsigned long) ip[3]); len += i; if (s) s += i;
  i = fmt_str(s,"."); len += i; if (s) s += i;
  i = fmt_ulong(s,(unsigned long) ip[2]); len += i; if (s) s += i;
  i = fmt_str(s,"."); len += i; if (s) s += i;
  i = fmt_ulong(s,(unsigned long) ip[1]); len += i; if (s) s += i;
  i = fmt_str(s,"."); len += i; if (s) s += i;
  i = fmt_ulong(s,(unsigned long) ip[0]); len += i; if (s) s += i;
  i = fmt_str(s,".in-addr.arpa."); len += i; if (s) s += i;
  return len;
}
 
unsigned int ip4_scan(const char *s,char ip[4])
{
  unsigned int i;
  unsigned int len;
  unsigned long u;
 
  byte_zero(ip,4);
  len = 0;
  i = scan_ulong((char *)s,&u); if (!i) { return 0; } ip[0] = u; s += i; len += i;
  if (*s != '.') { return 0; } ++s; ++len;
  i = scan_ulong((char *)s,&u); if (!i) { return 0; } ip[1] = u; s += i; len += i;
  if (*s != '.') { return 0; } ++s; ++len;
  i = scan_ulong((char *)s,&u); if (!i) { return 0; } ip[2] = u; s += i; len += i;
  if (*s != '.') { return 0; } ++s; ++len;
  i = scan_ulong((char *)s,&u); if (!i) { return 0; } ip[3] = u; s += i; len += i;
  return len;
}
 
unsigned int ip4_scanbracket(const char *s,char ip[4])
{
  unsigned int len;
 
  if (*s != '[') return 0;
  len = ip4_scan(s + 1,ip);
  if (!len) return 0;
  if (s[len + 1] != ']') return 0;
  return len + 2;
}
 
unsigned int ip4_cidr(char *s,char ip[4],unsigned long *plen)
{
  unsigned int j = 0;
  *plen = 32UL;
 
  j = str_chr(s,'/');
  if (s[j] == '/') {
     s[j] = 0;
     j = scan_ulong(s + j + 1,plen);
  } 
  return ip4_scan((const char *)s,ip);
}
 
unsigned int ip4_bytestring(stralloc *ipstring,char ip[4],int prefix)
{
  int i, j, n = 0;
  unsigned char number;
 
  if (!stralloc_readyplus(ipstring,32)) return -1;
  if (!stralloc_copys(ipstring,"")) return -1;
 
  for (i = 0; i < 4; i++) {
    number = (unsigned char) ip[i];
    if (number > 255) return -2;
 
    for (j = 7; j >= 0; j--) {
      if (number & (1 << j)) {
                          n++;
        if (!stralloc_cats(ipstring,"1")) return -1;
      } else {
                          n++;
        if (!stralloc_cats(ipstring,"0")) return -1;
      }
      prefix--;
                        if (!prefix) goto DONE;
    }
  }
 
DONE:
  if (!stralloc_0(ipstring)) return 1;
 
  return n;
}