diff options
Diffstat (limited to 'nuttx/libc/net/lib_inetntop.c')
| -rw-r--r-- | nuttx/libc/net/lib_inetntop.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/nuttx/libc/net/lib_inetntop.c b/nuttx/libc/net/lib_inetntop.c new file mode 100644 index 000000000..25c32c48c --- /dev/null +++ b/nuttx/libc/net/lib_inetntop.c @@ -0,0 +1,202 @@ +/**************************************************************************** + * libc/net/lib_inetntop.c + * + * Copyright (C) 2012 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Includes some logic extracted from hwport_ftpd, written by Jaehyuk Cho + * <minzkn@minzkn.com> which was released under the BSD license. + * + * Copyright (C) HWPORT.COM. All rights reserved. + * Author: JAEHYUK CHO <mailto:minzkn@minzkn.com> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <sys/socket.h> + +#include <stdio.h> +#include <string.h> +#include <errno.h> + +#include <arpa/inet.h> + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: inet_ntop + * + * Description: + * The inet_ntop() function converts a numeric address into a text string + * suitable for presentation. + * + * Input Parameters: + * af - The af argument specifies the family of the address. This can be + * AF_INET or AF_INET6. + * src - The src argument points to a buffer holding an address of the + * specified type. The address must be in network byte order. + * dst - The dst argument points to a buffer where the function stores + * the resulting text string; it shall not be NULL. + * size - The size argument specifies the size of this buffer, which must + * be large enough to hold the text string (INET_ADDRSTRLEN + * characters for IPv4, INET6_ADDRSTRLEN characters for IPv6). + * + * Returned Value: + * inet_ntop() returns a pointer to the buffer containing the text string + * if the conversion succeeds. Otherwise, NULL is returned and the errno + * is set to indicate the error. There follow errno values may be set: + * + * EAFNOSUPPORT - The af argument is invalid. + * ENOSPC - The size of the inet_ntop() result buffer is inadequate + * + ****************************************************************************/ + +FAR const char *inet_ntop(int af, FAR const void *src, FAR char *dst, socklen_t size) +{ + int errval; +#ifndef CONFIG_NET_IPv6 + FAR char *ptr; + + DEBUGASSERT(src && dst); + + if (af != AF_INET) + { + errval = EAFNOSUPPORT; + goto errout; + } + + if (size < INET_ADDRSTRLEN) + { + errval = ENOSPC; + goto errout; + } + + ptr = (FAR char*)src; + sprintf(dst, "%d.%d.%d.%d", ptr[0], ptr[1], ptr[2], ptr[3]); + return dst; +#else + FAR const struct in6_addr *in6_addr; + uint16_t warray[8]; + int offset; + int entry; + int count; + int maxentry; + int maxcount; + + DEBUGASSERT(src && dst); + + if (af != AF_INET6) + { + errval = EAFNOSUPPORT; + goto errout; + } + + if (size < INET6_ADDRSTRLEN) + { + errval = ENOSPC; + goto errout; + } + + in6_addr = (FAR const struct in6_addr *)src; + entry = -1; + maxentry = -1; + maxcount = 0; + offset = 0; + + while (offset < 8) + { + warray[offset] = ntohs(in6_addr->s6_addr16[offset]); + if (warray[offset] == 0) + { + entry = offset; + count = 1; + offset++; + + while (offset < 8) + { + warray[offset] = ntohs(in6_addr->s6_addr16[offset]); + if (warray[offset] != 0) + { + break; + } + offset++; + count++; + } + + if (count > maxcount) + { + maxentry = entry; + maxcount = count; + } + } + offset++; + } + + offset = 0; + dst[0] = '\0'; + + while (offset < 8) + { + if (offset == maxentry) + { + size -= snprintf(&dst[strlen(dst)], size, ":"); + offset += maxcount; + if (offset >= 8) + { + size -= snprintf(&dst[strlen(dst)], size, ":"); + } + } + else + { + if (offset > 0) + { + size -= snprintf(&dst[strlen(dst)], size, ":"); + } + + size -= snprintf(&dst[strlen(dst)], size, "%x", warray[offset]); + offset++; + } + } + + return dst; +#endif + +errout: + set_errno(errval); + memset(dst, 0, size); + return NULL; +} |