1 /** 2 * @file 3 * Common functions used throughout the stack. 4 * 5 * These are reference implementations of the byte swapping functions. 6 * Again with the aim of being simple, correct and fully portable. 7 * Byte swapping is the second thing you would want to optimize. You will 8 * need to port it to your architecture and in your cc.h: 9 * 10 * \#define lwip_htons(x) your_htons 11 * \#define lwip_htonl(x) your_htonl 12 * 13 * Note lwip_ntohs() and lwip_ntohl() are merely references to the htonx counterparts. 14 * 15 * If you \#define them to htons() and htonl(), you should 16 * \#define LWIP_DONT_PROVIDE_BYTEORDER_FUNCTIONS to prevent lwIP from 17 * defining htonx/ntohx compatibility macros. 18 19 * @defgroup sys_nonstandard Non-standard functions 20 * @ingroup sys_layer 21 * lwIP provides default implementations for non-standard functions. 22 * These can be mapped to OS functions to reduce code footprint if desired. 23 * All defines related to this section must not be placed in lwipopts.h, 24 * but in arch/cc.h! 25 * These options cannot be \#defined in lwipopts.h since they are not options 26 * of lwIP itself, but options of the lwIP port to your system. 27 */ 28 29 /* 30 * Copyright (c) 2001-2004 Swedish Institute of Computer Science. 31 * All rights reserved. 32 * 33 * Redistribution and use in source and binary forms, with or without modification, 34 * are permitted provided that the following conditions are met: 35 * 36 * 1. Redistributions of source code must retain the above copyright notice, 37 * this list of conditions and the following disclaimer. 38 * 2. Redistributions in binary form must reproduce the above copyright notice, 39 * this list of conditions and the following disclaimer in the documentation 40 * and/or other materials provided with the distribution. 41 * 3. The name of the author may not be used to endorse or promote products 42 * derived from this software without specific prior written permission. 43 * 44 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 45 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 46 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 47 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 48 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 49 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 50 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 51 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 52 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 53 * OF SUCH DAMAGE. 54 * 55 * This file is part of the lwIP TCP/IP stack. 56 * 57 * Author: Simon Goldschmidt 58 * 59 */ 60 61 #include "lwip/opt.h" 62 #include "lwip/def.h" 63 64 #include <string.h> 65 66 #if BYTE_ORDER == LITTLE_ENDIAN 67 68 #if !defined(lwip_htons) 69 /** 70 * Convert an u16_t from host- to network byte order. 71 * 72 * @param n u16_t in host byte order 73 * @return n in network byte order 74 */ 75 u16_t 76 lwip_htons(u16_t n) 77 { 78 return (u16_t)PP_HTONS(n); 79 } 80 #endif /* lwip_htons */ 81 82 #if !defined(lwip_htonl) 83 /** 84 * Convert an u32_t from host- to network byte order. 85 * 86 * @param n u32_t in host byte order 87 * @return n in network byte order 88 */ 89 u32_t 90 lwip_htonl(u32_t n) 91 { 92 return (u32_t)PP_HTONL(n); 93 } 94 #endif /* lwip_htonl */ 95 96 #endif /* BYTE_ORDER == LITTLE_ENDIAN */ 97 98 #ifndef lwip_strnstr 99 /** 100 * @ingroup sys_nonstandard 101 * lwIP default implementation for strnstr() non-standard function. 102 * This can be \#defined to strnstr() depending on your platform port. 103 */ 104 char* 105 lwip_strnstr(const char* buffer, const char* token, size_t n) 106 { 107 const char* p; 108 size_t tokenlen = strlen(token); 109 if (tokenlen == 0) { 110 return LWIP_CONST_CAST(char *, buffer); 111 } 112 for (p = buffer; *p && (p + tokenlen <= buffer + n); p++) { 113 if ((*p == *token) && (strncmp(p, token, tokenlen) == 0)) { 114 return LWIP_CONST_CAST(char *, p); 115 } 116 } 117 return NULL; 118 } 119 #endif 120 121 #ifndef lwip_stricmp 122 /** 123 * @ingroup sys_nonstandard 124 * lwIP default implementation for stricmp() non-standard function. 125 * This can be \#defined to stricmp() depending on your platform port. 126 */ 127 int 128 lwip_stricmp(const char* str1, const char* str2) 129 { 130 char c1, c2; 131 132 do { 133 c1 = *str1++; 134 c2 = *str2++; 135 if (c1 != c2) { 136 char c1_upc = c1 | 0x20; 137 if ((c1_upc >= 'a') && (c1_upc <= 'z')) { 138 /* characters are not equal an one is in the alphabet range: 139 downcase both chars and check again */ 140 char c2_upc = c2 | 0x20; 141 if (c1_upc != c2_upc) { 142 /* still not equal */ 143 /* don't care for < or > */ 144 return 1; 145 } 146 } else { 147 /* characters are not equal but none is in the alphabet range */ 148 return 1; 149 } 150 } 151 } while (c1 != 0); 152 return 0; 153 } 154 #endif 155 156 #ifndef lwip_strnicmp 157 /** 158 * @ingroup sys_nonstandard 159 * lwIP default implementation for strnicmp() non-standard function. 160 * This can be \#defined to strnicmp() depending on your platform port. 161 */ 162 int 163 lwip_strnicmp(const char* str1, const char* str2, size_t len) 164 { 165 char c1, c2; 166 167 do { 168 c1 = *str1++; 169 c2 = *str2++; 170 if (c1 != c2) { 171 char c1_upc = c1 | 0x20; 172 if ((c1_upc >= 'a') && (c1_upc <= 'z')) { 173 /* characters are not equal an one is in the alphabet range: 174 downcase both chars and check again */ 175 char c2_upc = c2 | 0x20; 176 if (c1_upc != c2_upc) { 177 /* still not equal */ 178 /* don't care for < or > */ 179 return 1; 180 } 181 } else { 182 /* characters are not equal but none is in the alphabet range */ 183 return 1; 184 } 185 } 186 } while (len-- && c1 != 0); 187 return 0; 188 } 189 #endif 190 191 #ifndef lwip_itoa 192 /** 193 * @ingroup sys_nonstandard 194 * lwIP default implementation for itoa() non-standard function. 195 * This can be \#defined to itoa() or snprintf(result, bufsize, "%d", number) depending on your platform port. 196 */ 197 void 198 lwip_itoa(char* result, size_t bufsize, int number) 199 { 200 const int base = 10; 201 char* ptr = result, *ptr1 = result, tmp_char; 202 int tmp_value; 203 LWIP_UNUSED_ARG(bufsize); 204 205 do { 206 tmp_value = number; 207 number /= base; 208 *ptr++ = "zyxwvutsrqponmlkjihgfedcba9876543210123456789abcdefghijklmnopqrstuvwxyz"[35 + (tmp_value - number * base)]; 209 } while(number); 210 211 /* Apply negative sign */ 212 if (tmp_value < 0) { 213 *ptr++ = '-'; 214 } 215 *ptr-- = '\0'; 216 while(ptr1 < ptr) { 217 tmp_char = *ptr; 218 *ptr--= *ptr1; 219 *ptr1++ = tmp_char; 220 } 221 } 222 #endif 223