1 /*------------------------------------------------------------------------- 2 * drawElements Base Portability Library 3 * ------------------------------------- 4 * 5 * Copyright 2014 The Android Open Source Project 6 * 7 * Licensed under the Apache License, Version 2.0 (the "License"); 8 * you may not use this file except in compliance with the License. 9 * You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, software 14 * distributed under the License is distributed on an "AS IS" BASIS, 15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 * See the License for the specific language governing permissions and 17 * limitations under the License. 18 * 19 *//*! 20 * \file 21 * \brief Basic string operations. 22 *//*--------------------------------------------------------------------*/ 23 24 #include "deString.h" 25 26 #include <string.h> 27 #include <stdlib.h> 28 29 #include <stdio.h> 30 #include <stdarg.h> 31 32 #if (DE_COMPILER == DE_COMPILER_MSC) 33 # include <varargs.h> 34 #endif 35 36 DE_BEGIN_EXTERN_C 37 38 /*--------------------------------------------------------------------*//*! 39 * \brief Compute hash from string. 40 * \param str String to compute hash value for. 41 * \return Computed hash value. 42 *//*--------------------------------------------------------------------*/ 43 deUint32 deStringHash (const char* str) 44 { 45 /* \note [pyry] This hash is used in DT_GNU_HASH and is proven 46 to be robust for symbol hashing. */ 47 /* \see http://sources.redhat.com/ml/binutils/2006-06/msg00418.html */ 48 deUint32 hash = 5381; 49 unsigned int c; 50 51 DE_ASSERT(str); 52 while ((c = (unsigned int)*str++) != 0) 53 hash = (hash << 5) + hash + c; 54 55 return hash; 56 } 57 58 deUint32 deStringHashLeading (const char* str, int numLeadingChars) 59 { 60 deUint32 hash = 5381; 61 unsigned int c; 62 63 DE_ASSERT(str); 64 while (numLeadingChars-- && (c = (unsigned int)*str++) != 0) 65 hash = (hash << 5) + hash + c; 66 67 return hash; 68 } 69 70 deUint32 deMemoryHash (const void* ptr, int numBytes) 71 { 72 /* \todo [2010-05-10 pyry] Better generic hash function? */ 73 const deUint8* input = (const deUint8*)ptr; 74 deUint32 hash = 5381; 75 76 DE_ASSERT(ptr); 77 while (numBytes--) 78 hash = (hash << 5) + hash + *input++; 79 80 return hash; 81 } 82 83 deBool deMemoryEqual (const void* ptr, const void* cmp, int numBytes) 84 { 85 return memcmp(ptr, cmp, numBytes) == 0; 86 } 87 88 /*--------------------------------------------------------------------*//*! 89 * \brief Compare two strings for equality. 90 * \param a First string. 91 * \param b Second string. 92 * \return True if strings equal, false otherwise. 93 *//*--------------------------------------------------------------------*/ 94 deBool deStringEqual (const char* a, const char* b) 95 { 96 DE_ASSERT(a && b); 97 return (strcmp(a, b) == 0); 98 } 99 100 deBool deStringBeginsWith (const char* str, const char* lead) 101 { 102 const char* a = str; 103 const char* b = lead; 104 105 while (*b) 106 { 107 if (*a++ != *b++) 108 return DE_FALSE; 109 } 110 111 return DE_TRUE; 112 } 113 114 115 int deVsprintf (char* string, size_t size, const char* format, va_list list) 116 { 117 int res; 118 119 DE_ASSERT(string && format); 120 121 #if (DE_COMPILER == DE_COMPILER_MSC) 122 # if (DE_OS == DE_OS_WINCE) 123 res = _vsnprintf(string, size, format, list); 124 # else 125 res = vsnprintf_s(string, size, _TRUNCATE, format, list); 126 # endif 127 #else 128 res = vsnprintf(string, size, format, list); 129 #endif 130 131 return res; 132 } 133 134 /*--------------------------------------------------------------------*//*! 135 * \brief Safe string print 136 * \note This has the new safe signature, i.e., string length is a 137 * required parameter. 138 *//*--------------------------------------------------------------------*/ 139 int deSprintf (char* string, size_t size, const char* format, ...) 140 { 141 va_list list; 142 int res; 143 144 DE_ASSERT(string && format); 145 146 va_start(list, format); 147 148 res = deVsprintf(string, size, format, list); 149 150 va_end(list); 151 152 return res; 153 } 154 155 /*--------------------------------------------------------------------*//*! 156 * \note This has the new safe signature, i.e., string length is a 157 * required parameter. 158 *//*--------------------------------------------------------------------*/ 159 char* deStrcpy (char* dst, size_t size, const char* src) 160 { 161 #if (DE_COMPILER == DE_COMPILER_MSC) && (DE_OS != DE_OS_WINCE) 162 (void)strcpy_s(dst, size, src); 163 return dst; 164 #else 165 return strncpy(dst, src, size); 166 #endif 167 } 168 169 /*--------------------------------------------------------------------*//*! 170 * \note This has the new safe signature, i.e., string length is a 171 * required parameter. 172 *//*--------------------------------------------------------------------*/ 173 char* deStrcat (char* s1, size_t size, const char* s2) 174 { 175 #if (DE_COMPILER == DE_COMPILER_MSC) && (DE_OS != DE_OS_WINCE) 176 (void)strcat_s(s1, size, s2); 177 return s1; 178 #else 179 return strncat(s1, s2, size); 180 #endif 181 } 182 183 DE_END_EXTERN_C 184
