Marco Zecchini
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Example_RTOS
Rtos API example
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lwip_def.c
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00001 /** 00002 * @file 00003 * Common functions used throughout the stack. 00004 * 00005 * These are reference implementations of the byte swapping functions. 00006 * Again with the aim of being simple, correct and fully portable. 00007 * Byte swapping is the second thing you would want to optimize. You will 00008 * need to port it to your architecture and in your cc.h: 00009 * 00010 * \#define lwip_htons(x) your_htons 00011 * \#define lwip_htonl(x) your_htonl 00012 * 00013 * Note lwip_ntohs() and lwip_ntohl() are merely references to the htonx counterparts. 00014 * 00015 * If you \#define them to htons() and htonl(), you should 00016 * \#define LWIP_DONT_PROVIDE_BYTEORDER_FUNCTIONS to prevent lwIP from 00017 * defining htonx/ntohx compatibility macros. 00018 00019 * @defgroup sys_nonstandard Non-standard functions 00020 * @ingroup sys_layer 00021 * lwIP provides default implementations for non-standard functions. 00022 * These can be mapped to OS functions to reduce code footprint if desired. 00023 * All defines related to this section must not be placed in lwipopts.h, 00024 * but in arch/cc.h! 00025 * These options cannot be \#defined in lwipopts.h since they are not options 00026 * of lwIP itself, but options of the lwIP port to your system. 00027 */ 00028 00029 /* 00030 * Copyright (c) 2001-2004 Swedish Institute of Computer Science. 00031 * All rights reserved. 00032 * 00033 * Redistribution and use in source and binary forms, with or without modification, 00034 * are permitted provided that the following conditions are met: 00035 * 00036 * 1. Redistributions of source code must retain the above copyright notice, 00037 * this list of conditions and the following disclaimer. 00038 * 2. Redistributions in binary form must reproduce the above copyright notice, 00039 * this list of conditions and the following disclaimer in the documentation 00040 * and/or other materials provided with the distribution. 00041 * 3. The name of the author may not be used to endorse or promote products 00042 * derived from this software without specific prior written permission. 00043 * 00044 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 00045 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00046 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 00047 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00048 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 00049 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00050 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00051 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 00052 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 00053 * OF SUCH DAMAGE. 00054 * 00055 * This file is part of the lwIP TCP/IP stack. 00056 * 00057 * Author: Simon Goldschmidt 00058 * 00059 */ 00060 00061 #include "lwip/opt.h" 00062 #include "lwip/def.h" 00063 00064 #include <string.h> 00065 00066 #if BYTE_ORDER == LITTLE_ENDIAN 00067 00068 #if !defined(lwip_htons) 00069 /** 00070 * Convert an u16_t from host- to network byte order. 00071 * 00072 * @param n u16_t in host byte order 00073 * @return n in network byte order 00074 */ 00075 u16_t 00076 lwip_htons(u16_t n) 00077 { 00078 return (u16_t)PP_HTONS(n); 00079 } 00080 #endif /* lwip_htons */ 00081 00082 #if !defined(lwip_htonl) 00083 /** 00084 * Convert an u32_t from host- to network byte order. 00085 * 00086 * @param n u32_t in host byte order 00087 * @return n in network byte order 00088 */ 00089 u32_t 00090 lwip_htonl(u32_t n) 00091 { 00092 return (u32_t)PP_HTONL(n); 00093 } 00094 #endif /* lwip_htonl */ 00095 00096 #endif /* BYTE_ORDER == LITTLE_ENDIAN */ 00097 00098 #ifndef lwip_strnstr 00099 /** 00100 * @ingroup sys_nonstandard 00101 * lwIP default implementation for strnstr() non-standard function. 00102 * This can be \#defined to strnstr() depending on your platform port. 00103 */ 00104 char* 00105 lwip_strnstr(const char* buffer, const char* token, size_t n) 00106 { 00107 const char* p; 00108 size_t tokenlen = strlen(token); 00109 if (tokenlen == 0) { 00110 return LWIP_CONST_CAST(char *, buffer); 00111 } 00112 for (p = buffer; *p && (p + tokenlen <= buffer + n); p++) { 00113 if ((*p == *token) && (strncmp(p, token, tokenlen) == 0)) { 00114 return LWIP_CONST_CAST(char *, p); 00115 } 00116 } 00117 return NULL; 00118 } 00119 #endif 00120 00121 #ifndef lwip_stricmp 00122 /** 00123 * @ingroup sys_nonstandard 00124 * lwIP default implementation for stricmp() non-standard function. 00125 * This can be \#defined to stricmp() depending on your platform port. 00126 */ 00127 int 00128 lwip_stricmp(const char* str1, const char* str2) 00129 { 00130 char c1, c2; 00131 00132 do { 00133 c1 = *str1++; 00134 c2 = *str2++; 00135 if (c1 != c2) { 00136 char c1_upc = c1 | 0x20; 00137 if ((c1_upc >= 'a') && (c1_upc <= 'z')) { 00138 /* characters are not equal an one is in the alphabet range: 00139 downcase both chars and check again */ 00140 char c2_upc = c2 | 0x20; 00141 if (c1_upc != c2_upc) { 00142 /* still not equal */ 00143 /* don't care for < or > */ 00144 return 1; 00145 } 00146 } else { 00147 /* characters are not equal but none is in the alphabet range */ 00148 return 1; 00149 } 00150 } 00151 } while (c1 != 0); 00152 return 0; 00153 } 00154 #endif 00155 00156 #ifndef lwip_strnicmp 00157 /** 00158 * @ingroup sys_nonstandard 00159 * lwIP default implementation for strnicmp() non-standard function. 00160 * This can be \#defined to strnicmp() depending on your platform port. 00161 */ 00162 int 00163 lwip_strnicmp(const char* str1, const char* str2, size_t len) 00164 { 00165 char c1, c2; 00166 00167 do { 00168 c1 = *str1++; 00169 c2 = *str2++; 00170 if (c1 != c2) { 00171 char c1_upc = c1 | 0x20; 00172 if ((c1_upc >= 'a') && (c1_upc <= 'z')) { 00173 /* characters are not equal an one is in the alphabet range: 00174 downcase both chars and check again */ 00175 char c2_upc = c2 | 0x20; 00176 if (c1_upc != c2_upc) { 00177 /* still not equal */ 00178 /* don't care for < or > */ 00179 return 1; 00180 } 00181 } else { 00182 /* characters are not equal but none is in the alphabet range */ 00183 return 1; 00184 } 00185 } 00186 } while (len-- && c1 != 0); 00187 return 0; 00188 } 00189 #endif 00190 00191 #ifndef lwip_itoa 00192 /** 00193 * @ingroup sys_nonstandard 00194 * lwIP default implementation for itoa() non-standard function. 00195 * This can be \#defined to itoa() or snprintf(result, bufsize, "%d", number) depending on your platform port. 00196 */ 00197 void 00198 lwip_itoa(char* result, size_t bufsize, int number) 00199 { 00200 const int base = 10; 00201 char* ptr = result, *ptr1 = result, tmp_char; 00202 int tmp_value; 00203 LWIP_UNUSED_ARG(bufsize); 00204 00205 do { 00206 tmp_value = number; 00207 number /= base; 00208 *ptr++ = "zyxwvutsrqponmlkjihgfedcba9876543210123456789abcdefghijklmnopqrstuvwxyz"[35 + (tmp_value - number * base)]; 00209 } while(number); 00210 00211 /* Apply negative sign */ 00212 if (tmp_value < 0) { 00213 *ptr++ = '-'; 00214 } 00215 *ptr-- = '\0'; 00216 while(ptr1 < ptr) { 00217 tmp_char = *ptr; 00218 *ptr--= *ptr1; 00219 *ptr1++ = tmp_char; 00220 } 00221 } 00222 #endif
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