[457] | 1 | /**
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| 2 | * @file
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| 3 | * Common functions used throughout the stack.
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| 4 | *
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| 5 | * These are reference implementations of the byte swapping functions.
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| 6 | * Again with the aim of being simple, correct and fully portable.
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| 7 | * Byte swapping is the second thing you would want to optimize. You will
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| 8 | * need to port it to your architecture and in your cc.h:
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| 9 | *
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| 10 | * \#define lwip_htons(x) your_htons
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| 11 | * \#define lwip_htonl(x) your_htonl
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| 12 | *
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| 13 | * Note lwip_ntohs() and lwip_ntohl() are merely references to the htonx counterparts.
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| 14 | *
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| 15 | * If you \#define them to htons() and htonl(), you should
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| 16 | * \#define LWIP_DONT_PROVIDE_BYTEORDER_FUNCTIONS to prevent lwIP from
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| 17 | * defining htonx/ntohx compatibility macros.
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| 18 |
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| 19 | * @defgroup sys_nonstandard Non-standard functions
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| 20 | * @ingroup sys_layer
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| 21 | * lwIP provides default implementations for non-standard functions.
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| 22 | * These can be mapped to OS functions to reduce code footprint if desired.
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| 23 | * All defines related to this section must not be placed in lwipopts.h,
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| 24 | * but in arch/cc.h!
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| 25 | * These options cannot be \#defined in lwipopts.h since they are not options
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| 26 | * of lwIP itself, but options of the lwIP port to your system.
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| 27 | */
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| 28 |
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| 29 | /*
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| 30 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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| 31 | * All rights reserved.
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| 32 | *
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| 33 | * Redistribution and use in source and binary forms, with or without modification,
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| 34 | * are permitted provided that the following conditions are met:
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| 35 | *
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| 36 | * 1. Redistributions of source code must retain the above copyright notice,
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| 37 | * this list of conditions and the following disclaimer.
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| 38 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 39 | * this list of conditions and the following disclaimer in the documentation
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| 40 | * and/or other materials provided with the distribution.
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| 41 | * 3. The name of the author may not be used to endorse or promote products
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| 42 | * derived from this software without specific prior written permission.
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| 43 | *
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| 44 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 45 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 46 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 47 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 48 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 49 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 50 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 51 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 52 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 53 | * OF SUCH DAMAGE.
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| 54 | *
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| 55 | * This file is part of the lwIP TCP/IP stack.
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| 56 | *
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| 57 | * Author: Simon Goldschmidt
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| 58 | *
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| 59 | */
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| 60 |
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| 61 | #include "lwip/opt.h"
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| 62 | #include "lwip/def.h"
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| 63 |
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| 64 | #include <string.h>
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| 65 |
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| 66 | #if BYTE_ORDER == LITTLE_ENDIAN
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| 67 |
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| 68 | #if !defined(lwip_htons)
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| 69 | /**
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| 70 | * Convert an u16_t from host- to network byte order.
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| 71 | *
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| 72 | * @param n u16_t in host byte order
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| 73 | * @return n in network byte order
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| 74 | */
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| 75 | u16_t
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| 76 | lwip_htons(u16_t n)
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| 77 | {
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| 78 | return PP_HTONS(n);
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| 79 | }
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| 80 | #endif /* lwip_htons */
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| 81 |
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| 82 | #if !defined(lwip_htonl)
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| 83 | /**
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| 84 | * Convert an u32_t from host- to network byte order.
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| 85 | *
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| 86 | * @param n u32_t in host byte order
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| 87 | * @return n in network byte order
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| 88 | */
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| 89 | u32_t
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| 90 | lwip_htonl(u32_t n)
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| 91 | {
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| 92 | return PP_HTONL(n);
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| 93 | }
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| 94 | #endif /* lwip_htonl */
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| 95 |
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| 96 | #endif /* BYTE_ORDER == LITTLE_ENDIAN */
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| 97 |
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| 98 | #ifndef lwip_strnstr
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| 99 | /**
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| 100 | * @ingroup sys_nonstandard
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| 101 | * lwIP default implementation for strnstr() non-standard function.
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| 102 | * This can be \#defined to strnstr() depending on your platform port.
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| 103 | */
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| 104 | char *
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| 105 | lwip_strnstr(const char *buffer, const char *token, size_t n)
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| 106 | {
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| 107 | const char *p;
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| 108 | size_t tokenlen = strlen(token);
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| 109 | if (tokenlen == 0) {
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| 110 | return LWIP_CONST_CAST(char *, buffer);
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| 111 | }
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| 112 | for (p = buffer; *p && (p + tokenlen <= buffer + n); p++) {
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| 113 | if ((*p == *token) && (strncmp(p, token, tokenlen) == 0)) {
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| 114 | return LWIP_CONST_CAST(char *, p);
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| 115 | }
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| 116 | }
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| 117 | return NULL;
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| 118 | }
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| 119 | #endif
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| 120 |
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| 121 | #ifndef lwip_stricmp
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| 122 | /**
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| 123 | * @ingroup sys_nonstandard
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| 124 | * lwIP default implementation for stricmp() non-standard function.
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| 125 | * This can be \#defined to stricmp() depending on your platform port.
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| 126 | */
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| 127 | int
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| 128 | lwip_stricmp(const char *str1, const char *str2)
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| 129 | {
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| 130 | char c1, c2;
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| 131 |
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| 132 | do {
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| 133 | c1 = *str1++;
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| 134 | c2 = *str2++;
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| 135 | if (c1 != c2) {
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| 136 | char c1_upc = c1 | 0x20;
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| 137 | if ((c1_upc >= 'a') && (c1_upc <= 'z')) {
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| 138 | /* characters are not equal an one is in the alphabet range:
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| 139 | downcase both chars and check again */
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| 140 | char c2_upc = c2 | 0x20;
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| 141 | if (c1_upc != c2_upc) {
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| 142 | /* still not equal */
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| 143 | /* don't care for < or > */
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| 144 | return 1;
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| 145 | }
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| 146 | } else {
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| 147 | /* characters are not equal but none is in the alphabet range */
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| 148 | return 1;
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| 149 | }
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| 150 | }
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| 151 | } while (c1 != 0);
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| 152 | return 0;
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| 153 | }
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| 154 | #endif
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| 155 |
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| 156 | #ifndef lwip_strnicmp
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| 157 | /**
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| 158 | * @ingroup sys_nonstandard
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| 159 | * lwIP default implementation for strnicmp() non-standard function.
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| 160 | * This can be \#defined to strnicmp() depending on your platform port.
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| 161 | */
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| 162 | int
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| 163 | lwip_strnicmp(const char *str1, const char *str2, size_t len)
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| 164 | {
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| 165 | char c1, c2;
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| 166 |
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| 167 | do {
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| 168 | c1 = *str1++;
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| 169 | c2 = *str2++;
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| 170 | if (c1 != c2) {
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| 171 | char c1_upc = c1 | 0x20;
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| 172 | if ((c1_upc >= 'a') && (c1_upc <= 'z')) {
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| 173 | /* characters are not equal an one is in the alphabet range:
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| 174 | downcase both chars and check again */
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| 175 | char c2_upc = c2 | 0x20;
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| 176 | if (c1_upc != c2_upc) {
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| 177 | /* still not equal */
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| 178 | /* don't care for < or > */
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| 179 | return 1;
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| 180 | }
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| 181 | } else {
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| 182 | /* characters are not equal but none is in the alphabet range */
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| 183 | return 1;
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| 184 | }
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| 185 | }
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| 186 | len--;
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| 187 | } while ((len != 0) && (c1 != 0));
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| 188 | return 0;
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| 189 | }
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| 190 | #endif
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| 191 |
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| 192 | #ifndef lwip_itoa
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| 193 | /**
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| 194 | * @ingroup sys_nonstandard
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| 195 | * lwIP default implementation for itoa() non-standard function.
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| 196 | * This can be \#defined to itoa() or snprintf(result, bufsize, "%d", number) depending on your platform port.
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| 197 | */
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| 198 | void
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| 199 | lwip_itoa(char *result, size_t bufsize, int number)
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| 200 | {
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| 201 | char *res = result;
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| 202 | char *tmp = result + bufsize - 1;
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| 203 | int n = (number >= 0) ? number : -number;
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| 204 |
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| 205 | /* handle invalid bufsize */
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| 206 | if (bufsize < 2) {
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| 207 | if (bufsize == 1) {
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| 208 | *result = 0;
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| 209 | }
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| 210 | return;
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| 211 | }
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| 212 |
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| 213 | /* First, add sign */
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| 214 | if (number < 0) {
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| 215 | *res++ = '-';
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| 216 | }
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| 217 | /* Then create the string from the end and stop if buffer full,
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| 218 | and ensure output string is zero terminated */
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| 219 | *tmp = 0;
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| 220 | while ((n != 0) && (tmp > res)) {
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| 221 | char val = (char)('0' + (n % 10));
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| 222 | tmp--;
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| 223 | *tmp = val;
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| 224 | n = n / 10;
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| 225 | }
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| 226 | if (n) {
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| 227 | /* buffer is too small */
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| 228 | *result = 0;
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| 229 | return;
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| 230 | }
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| 231 | if (*tmp == 0) {
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| 232 | /* Nothing added? */
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| 233 | *res++ = '0';
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| 234 | *res++ = 0;
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| 235 | return;
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| 236 | }
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| 237 | /* move from temporary buffer to output buffer (sign is not moved) */
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| 238 | memmove(res, tmp, (size_t)((result + bufsize) - tmp));
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| 239 | }
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| 240 | #endif
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