/* grecs - Gray's Extensible Configuration System
Copyright (C) 2007-2016 Sergey Poznyakoff
Grecs is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
Grecs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with Grecs. If not, see . */
#ifdef HAVE_CONFIG_H
# include
#endif
#include
#include
#include "grecs.h"
int
grecs_str_is_ipv4(const char *addr)
{
int dot_count = 0;
int digit_count = 0;
for (; *addr; addr++) {
if (!isascii(*addr))
return 0;
if (*addr == '.') {
if (++dot_count > 3)
break;
digit_count = 0;
} else if (!(isdigit(*addr) && ++digit_count <= 3))
return 0;
}
return (dot_count == 3);
}
int
grecs_str_is_ipv6(const char *addr)
{
int col_count = 0; /* Number of colons */
int dcol = 0; /* Did we encounter a double-colon? */
int dig_count = 0; /* Number of digits in the last group */
for (; *addr; addr++) {
if (!isascii(*addr))
return 0;
else if (isxdigit(*addr)) {
if (++dig_count > 4)
return 0;
} else if (*addr == ':') {
if (col_count && dig_count == 0 && ++dcol > 1)
return 0;
if (++col_count > 7)
return 0;
dig_count = 0;
} else
return 0;
}
return (col_count == 7 || dcol);
}
int
grecs_str_is_num(const char *s)
{
for (; *s; ++s)
if (!isdigit(*s))
return 0;
return 1;
}
int
grecs_str_is_ipaddr(const char *addr)
{
if (strchr (addr, '.'))
return grecs_str_is_ipv4(addr);
else if (strchr (addr, ':'))
return grecs_str_is_ipv6(addr);
return 0;
}