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| (Empty) |
| 1 | |
| 2 #include "libctiny.h" | |
| 3 #include <windows.h> | |
| 4 #include <errno.h> | |
| 5 #include "memory.h" | |
| 6 | |
| 7 // memmove is defined first so it will use the intrinsic memcpy | |
| 8 void * __cdecl memmove(void * dst, const void * src, size_t count) { | |
| 9 void * ret = dst; | |
| 10 | |
| 11 if (dst <= src || (char *)dst >= ((char *)src + count)) { | |
| 12 // Non-Overlapping Buffers - copy from lower addresses to higher addresses | |
| 13 // saves 500 bytes of 1.4MB in uncompressed setup.exe, worth it? | |
| 14 memcpy(dst, src, count); | |
| 15 // while (count--) { | |
| 16 // *(char *)dst = *(char *)src; | |
| 17 // dst = (char *)dst + 1; | |
| 18 // src = (char *)src + 1; | |
| 19 // } | |
| 20 } | |
| 21 else { | |
| 22 // Overlapping Buffers - copy from higher addresses to lower addresses | |
| 23 dst = (char *)dst + count - 1; | |
| 24 src = (char *)src + count - 1; | |
| 25 | |
| 26 while (count--) { | |
| 27 *(char *)dst = *(char *)src; | |
| 28 dst = (char *)dst - 1; | |
| 29 src = (char *)src - 1; | |
| 30 } | |
| 31 } | |
| 32 | |
| 33 return(ret); | |
| 34 } | |
| 35 | |
| 36 // Turn off compiler intrinsics so that we can define these functions | |
| 37 #pragma function(memcmp, memcpy, memset) | |
| 38 | |
| 39 int __cdecl memcmp(const void * buf1, const void * buf2, size_t count) { | |
| 40 if (!count) | |
| 41 return(0); | |
| 42 while (--count && *(char *)buf1 == *(char *)buf2) { | |
| 43 buf1 = (char *)buf1 + 1; | |
| 44 buf2 = (char *)buf2 + 1; | |
| 45 } | |
| 46 return( *((unsigned char *)buf1) - *((unsigned char *)buf2) ); | |
| 47 } | |
| 48 | |
| 49 void * __cdecl memcpy(void * dst, const void * src, size_t count) { | |
| 50 void * ret = dst; | |
| 51 // copy from lower addresses to higher addresses | |
| 52 while (count--) { | |
| 53 *(char *)dst = *(char *)src; | |
| 54 dst = (char *)dst + 1; | |
| 55 src = (char *)src + 1; | |
| 56 } | |
| 57 return(ret); | |
| 58 } | |
| 59 | |
| 60 void * __cdecl memset(void *dst, int val, size_t count) { | |
| 61 void *start = dst; | |
| 62 while (count--) { | |
| 63 *(char *)dst = (char)val; | |
| 64 dst = (char *)dst + 1; | |
| 65 } | |
| 66 return(start); | |
| 67 } | |
| 68 | |
| 69 errno_t __cdecl memmove_s(void* dst, | |
| 70 size_t size_in_bytes, | |
| 71 const void* src, | |
| 72 size_t count) { | |
| 73 if (count == 0) { | |
| 74 return 0; | |
| 75 } | |
| 76 | |
| 77 if (!dst) return EINVAL; | |
| 78 if (!src) return EINVAL; | |
| 79 if (size_in_bytes < count) return ERANGE; | |
| 80 | |
| 81 memmove(dst, src, count); | |
| 82 return 0; | |
| 83 } | |
| 84 | |
| 85 errno_t __cdecl memcpy_s(void *dst, | |
| 86 size_t size_in_bytes, | |
| 87 const void *src, | |
| 88 size_t count) { | |
| 89 if (count == 0) { | |
| 90 return 0; | |
| 91 } | |
| 92 | |
| 93 if (!dst) return EINVAL; | |
| 94 if (!src) return EINVAL; | |
| 95 if (size_in_bytes < count) return ERANGE; | |
| 96 | |
| 97 memcpy(dst, src, count); | |
| 98 return 0; | |
| 99 } | |
| 100 | |
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Chromium Code Reviews
Issue 624713003:
Keep only base/extractor.[cc|h]. (Closed)
Base URL: https://chromium.googlesource.com/external/omaha.git@master