| /** |
| * @file |
| * Common functions used throughout the stack. |
| * |
| * These are reference implementations of the byte swapping functions. |
| * Again with the aim of being simple, correct and fully portable. |
| * Byte swapping is the second thing you would want to optimize. You will |
| * need to port it to your architecture and in your cc.h: |
| * |
| * \#define lwip_htons(x) your_htons |
| * \#define lwip_htonl(x) your_htonl |
| * |
| * Note lwip_ntohs() and lwip_ntohl() are merely references to the htonx counterparts. |
| * |
| * If you \#define them to htons() and htonl(), you should |
| * \#define LWIP_DONT_PROVIDE_BYTEORDER_FUNCTIONS to prevent lwIP from |
| * defining htonx/ntohx compatibility macros. |
| |
| * @defgroup sys_nonstandard Non-standard functions |
| * @ingroup sys_layer |
| * lwIP provides default implementations for non-standard functions. |
| * These can be mapped to OS functions to reduce code footprint if desired. |
| */ |
| |
| /* |
| * Copyright (c) 2001-2004 Swedish Institute of Computer Science. |
| * All rights reserved. |
| * |
| * 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. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. |
| * |
| * This file is part of the lwIP TCP/IP stack. |
| * |
| * Author: Simon Goldschmidt |
| * |
| */ |
| |
| #include "lwip/opt.h" |
| #include "lwip/def.h" |
| |
| #include <string.h> |
| |
| #if BYTE_ORDER == LITTLE_ENDIAN |
| |
| #if !defined(lwip_htons) |
| /** |
| * Convert an u16_t from host- to network byte order. |
| * |
| * @param n u16_t in host byte order |
| * @return n in network byte order |
| */ |
| u16_t |
| lwip_htons(u16_t n) |
| { |
| return (u16_t)PP_HTONS(n); |
| } |
| #endif /* lwip_htons */ |
| |
| #if !defined(lwip_htonl) |
| /** |
| * Convert an u32_t from host- to network byte order. |
| * |
| * @param n u32_t in host byte order |
| * @return n in network byte order |
| */ |
| u32_t |
| lwip_htonl(u32_t n) |
| { |
| return (u32_t)PP_HTONL(n); |
| } |
| #endif /* lwip_htonl */ |
| |
| #endif /* BYTE_ORDER == LITTLE_ENDIAN */ |
| |
| #ifndef lwip_strnstr |
| /** |
| * @ingroup sys_nonstandard |
| * lwIP default implementation for strnstr() non-standard function. |
| * This can be \#defined to strnstr() depending on your platform port. |
| */ |
| char* |
| lwip_strnstr(const char* buffer, const char* token, size_t n) |
| { |
| const char* p; |
| int tokenlen = (int)strlen(token); |
| if (tokenlen == 0) { |
| return (char *)(size_t)buffer; |
| } |
| for (p = buffer; *p && (p + tokenlen <= buffer + n); p++) { |
| if ((*p == *token) && (strncmp(p, token, tokenlen) == 0)) { |
| return (char *)(size_t)p; |
| } |
| } |
| return NULL; |
| } |
| #endif |
| |
| #ifndef lwip_stricmp |
| /** |
| * @ingroup sys_nonstandard |
| * lwIP default implementation for stricmp() non-standard function. |
| * This can be \#defined to stricmp() depending on your platform port. |
| */ |
| int |
| lwip_stricmp(const char* str1, const char* str2) |
| { |
| char c1, c2; |
| |
| do { |
| c1 = *str1++; |
| c2 = *str2++; |
| if (c1 != c2) { |
| char c1_upc = c1 | 0x20; |
| if ((c1_upc >= 'a') && (c1_upc <= 'z')) { |
| /* characters are not equal an one is in the alphabet range: |
| downcase both chars and check again */ |
| char c2_upc = c2 | 0x20; |
| if (c1_upc != c2_upc) { |
| /* still not equal */ |
| /* don't care for < or > */ |
| return 1; |
| } |
| } else { |
| /* characters are not equal but none is in the alphabet range */ |
| return 1; |
| } |
| } |
| } while (c1 != 0); |
| return 0; |
| } |
| #endif |
| |
| #ifndef lwip_strnicmp |
| /** |
| * @ingroup sys_nonstandard |
| * lwIP default implementation for strnicmp() non-standard function. |
| * This can be \#defined to strnicmp() depending on your platform port. |
| */ |
| int |
| lwip_strnicmp(const char* str1, const char* str2, size_t len) |
| { |
| char c1, c2; |
| |
| do { |
| c1 = *str1++; |
| c2 = *str2++; |
| if (c1 != c2) { |
| char c1_upc = c1 | 0x20; |
| if ((c1_upc >= 'a') && (c1_upc <= 'z')) { |
| /* characters are not equal an one is in the alphabet range: |
| downcase both chars and check again */ |
| char c2_upc = c2 | 0x20; |
| if (c1_upc != c2_upc) { |
| /* still not equal */ |
| /* don't care for < or > */ |
| return 1; |
| } |
| } else { |
| /* characters are not equal but none is in the alphabet range */ |
| return 1; |
| } |
| } |
| } while (len-- && c1 != 0); |
| return 0; |
| } |
| #endif |
| |
| #ifndef lwip_itoa |
| /** |
| * @ingroup sys_nonstandard |
| * lwIP default implementation for itoa() non-standard function. |
| * This can be \#defined to itoa() or snprintf(result, bufsize, "%d", number) depending on your platform port. |
| */ |
| void |
| lwip_itoa(char* result, size_t bufsize, int number) |
| { |
| const int base = 10; |
| char* ptr = result, *ptr1 = result, tmp_char; |
| int tmp_value; |
| LWIP_UNUSED_ARG(bufsize); |
| |
| do { |
| tmp_value = number; |
| number /= base; |
| *ptr++ = "zyxwvutsrqponmlkjihgfedcba9876543210123456789abcdefghijklmnopqrstuvwxyz"[35 + (tmp_value - number * base)]; |
| } while(number); |
| |
| /* Apply negative sign */ |
| if (tmp_value < 0) { |
| *ptr++ = '-'; |
| } |
| *ptr-- = '\0'; |
| while(ptr1 < ptr) { |
| tmp_char = *ptr; |
| *ptr--= *ptr1; |
| *ptr1++ = tmp_char; |
| } |
| } |
| #endif |