1 /** @file 2 Copying Functions for <string.h>. 3 4 Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR> 5 This program and the accompanying materials are licensed and made available under 6 the terms and conditions of the BSD License that accompanies this distribution. 7 The full text of the license may be found at 8 http://opensource.org/licenses/bsd-license.php. 9 10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 **/ 13 #include <Uefi.h> 14 #include <Library/BaseLib.h> 15 #include <Library/BaseMemoryLib.h> 16 17 #include <LibConfig.h> 18 19 #include <stdlib.h> 20 #include <string.h> 21 22 /** Do not define memcpy for IPF+GCC or ARM/AARCH64+GCC builds. 23 For IPF, using a GCC compiler, the memcpy function is converted to 24 CopyMem by objcpy during build. 25 For ARM/AARCH64, the memcpy function is provided by the CompilerIntrinsics library. 26 **/ 27 #if !((defined(MDE_CPU_IPF) || defined(MDE_CPU_ARM) || defined(MDE_CPU_AARCH64)) && defined(__GNUC__)) 28 /** The memcpy function copies n characters from the object pointed to by s2 29 into the object pointed to by s1. 30 31 The implementation is reentrant and handles the case where s2 overlaps s1. 32 33 @return The memcpy function returns the value of s1. 34 **/ 35 void * 36 memcpy(void * __restrict s1, const void * __restrict s2, size_t n) 37 { 38 return CopyMem( s1, s2, n); 39 } 40 #endif /* !(defined(MDE_CPU_IPF) && defined(__GCC)) */ 41 42 #if !(defined(MDE_CPU_ARM) && defined(__GNUC__)) 43 /** The memmove function copies n characters from the object pointed to by s2 44 into the object pointed to by s1. Copying takes place as if the n 45 characters from the object pointed to by s2 are first copied into a 46 temporary array of n characters that does not overlap the objects pointed 47 to by s1 and s2, and then the n characters from the temporary array are 48 copied into the object pointed to by s1. 49 50 This is a version of memcpy that is guaranteed to work when s1 and s2 51 overlap. Since our implementation of memcpy already handles overlap, 52 memmove can be identical to memcpy. 53 54 @return The memmove function returns the value of s1. 55 **/ 56 void * 57 memmove(void *s1, const void *s2, size_t n) 58 { 59 return CopyMem( s1, s2, n); 60 } 61 #endif 62 63 /** The strcpy function copies the string pointed to by s2 (including the 64 terminating null character) into the array pointed to by s1. If copying 65 takes place between objects that overlap, the behavior is undefined. 66 67 @return The strcpy function returns the value of s1. 68 **/ 69 char * 70 strcpy(char * __restrict s1, const char * __restrict s2) 71 { 72 //char *s1ret = s1; 73 74 //while ( *s1++ = *s2++) /* Empty Body */; 75 //return(s1ret); 76 return AsciiStrCpy( s1, s2); 77 } 78 79 /** The strncpy function copies not more than n characters (characters that 80 follow a null character are not copied) from the array pointed to by s2 to 81 the array pointed to by s1. If copying takes place between objects that 82 overlap, the behavior is undefined. 83 84 If the array pointed to by s2 is a string that is shorter than n 85 characters, null characters are appended to the copy in the array pointed 86 to by s1, until n characters in all have been written. 87 88 @return The strncpy function returns the value of s1. 89 **/ 90 char *strncpy(char * __restrict s1, const char * __restrict s2, size_t n) 91 { 92 return AsciiStrnCpy( s1, s2, n); 93 //char *dest = s1; 94 95 //while(n != 0) { 96 // --n; 97 // if((*dest++ = *s2++) == '\0') break; 98 //} 99 //while(n != 0) { 100 // *dest++ = '\0'; 101 // --n; 102 //} 103 //return (s1); 104 } 105 106 /** The strncpyX function copies not more than n-1 characters (characters that 107 follow a null character are not copied) from the array pointed to by s2 to 108 the array pointed to by s1. Array s1 is guaranteed to be NULL terminated. 109 If copying takes place between objects that overlap, 110 the behavior is undefined. 111 112 strncpyX exists because normal strncpy does not indicate if the copy was 113 terminated because of exhausting the buffer or reaching the end of s2. 114 115 @return The strncpyX function returns 0 if the copy operation was 116 terminated because it reached the end of s1. Otherwise, 117 a non-zero value is returned indicating how many characters 118 remain in s1. 119 **/ 120 int strncpyX(char * __restrict s1, const char * __restrict s2, size_t n) 121 { 122 int NumLeft; 123 124 for( ; n != 0; --n) { 125 if((*s1++ = *s2++) == '\0') break; 126 } 127 NumLeft = (int)n; 128 129 for( --s1; n != 0; --n) { 130 *s1++ = '\0'; 131 } 132 133 return NumLeft; // Zero if we ran out of buffer ( strlen(s1) < strlen(s2) ) 134 } 135 136 /** NetBSD Compatibility Function strdup creates a duplicate copy of a string. **/ 137 char * 138 strdup(const char *str) 139 { 140 size_t len; 141 char *copy; 142 143 len = strlen(str) + 1; 144 if ((copy = malloc(len)) == NULL) 145 return (NULL); 146 memcpy(copy, str, len); 147 return (copy); 148 } 149
