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+GCC builds.
23 For IPF, using a GCC compiler, the memcpy function is converted to
24 CopyMem by objcpy during build.
25 For ARM, the memcpy function is provided by the CompilerIntrinsics library.
26 **/
27 #if !((defined(MDE_CPU_IPF) || defined(MDE_CPU_ARM)) && 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 *
memcpy(void * __restrict s1,const void * __restrict s2,size_t n)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 /** The memmove function copies n characters from the object pointed to by s2
43 into the object pointed to by s1. Copying takes place as if the n
44 characters from the object pointed to by s2 are first copied into a
45 temporary array of n characters that does not overlap the objects pointed
46 to by s1 and s2, and then the n characters from the temporary array are
47 copied into the object pointed to by s1.
48
49 This is a version of memcpy that is guaranteed to work when s1 and s2
50 overlap. Since our implementation of memcpy already handles overlap,
51 memmove can be identical to memcpy.
52
53 @return The memmove function returns the value of s1.
54 **/
55 void *
memmove(void * s1,const void * s2,size_t n)56 memmove(void *s1, const void *s2, size_t n)
57 {
58 return CopyMem( s1, s2, n);
59 }
60
61 /** The strcpy function copies the string pointed to by s2 (including the
62 terminating null character) into the array pointed to by s1. If copying
63 takes place between objects that overlap, the behavior is undefined.
64
65 @return The strcpy function returns the value of s1.
66 **/
67 char *
strcpy(char * __restrict s1,const char * __restrict s2)68 strcpy(char * __restrict s1, const char * __restrict s2)
69 {
70 //char *s1ret = s1;
71
72 //while ( *s1++ = *s2++) /* Empty Body */;
73 //return(s1ret);
74 return AsciiStrCpy( s1, s2);
75 }
76
77 /** The strncpy function copies not more than n characters (characters that
78 follow a null character are not copied) from the array pointed to by s2 to
79 the array pointed to by s1. If copying takes place between objects that
80 overlap, the behavior is undefined.
81
82 If the array pointed to by s2 is a string that is shorter than n
83 characters, null characters are appended to the copy in the array pointed
84 to by s1, until n characters in all have been written.
85
86 @return The strncpy function returns the value of s1.
87 **/
strncpy(char * __restrict s1,const char * __restrict s2,size_t n)88 char *strncpy(char * __restrict s1, const char * __restrict s2, size_t n)
89 {
90 return AsciiStrnCpy( s1, s2, n);
91 //char *dest = s1;
92
93 //while(n != 0) {
94 // --n;
95 // if((*dest++ = *s2++) == '\0') break;
96 //}
97 //while(n != 0) {
98 // *dest++ = '\0';
99 // --n;
100 //}
101 //return (s1);
102 }
103
104 /** The strncpyX function copies not more than n-1 characters (characters that
105 follow a null character are not copied) from the array pointed to by s2 to
106 the array pointed to by s1. Array s1 is guaranteed to be NULL terminated.
107 If copying takes place between objects that overlap,
108 the behavior is undefined.
109
110 strncpyX exists because normal strncpy does not indicate if the copy was
111 terminated because of exhausting the buffer or reaching the end of s2.
112
113 @return The strncpyX function returns 0 if the copy operation was
114 terminated because it reached the end of s1. Otherwise,
115 a non-zero value is returned indicating how many characters
116 remain in s1.
117 **/
strncpyX(char * __restrict s1,const char * __restrict s2,size_t n)118 int strncpyX(char * __restrict s1, const char * __restrict s2, size_t n)
119 {
120 int NumLeft;
121
122 for( ; n != 0; --n) {
123 if((*s1++ = *s2++) == '\0') break;
124 }
125 NumLeft = (int)n;
126
127 for( --s1; n != 0; --n) {
128 *s1++ = '\0';
129 }
130
131 return NumLeft; // Zero if we ran out of buffer ( strlen(s1) < strlen(s2) )
132 }
133
134 /** NetBSD Compatibility Function strdup creates a duplicate copy of a string. **/
135 char *
strdup(const char * str)136 strdup(const char *str)
137 {
138 size_t len;
139 char *copy;
140
141 len = strlen(str) + 1;
142 if ((copy = malloc(len)) == NULL)
143 return (NULL);
144 memcpy(copy, str, len);
145 return (copy);
146 }
147