kern
annotate src/klibc/string.c @ 2:86781ef20689
added hardware scrolling, memset16 and temporary keyboard input for testing
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sat, 04 Dec 2010 08:04:43 +0200 |
| parents | ebe5e0e44a9d |
| children | 0489a34ab348 |
| rev | line source |
|---|---|
| nuclear@0 | 1 #include <string.h> |
| nuclear@0 | 2 |
| nuclear@1 | 3 void memset(void *s, int c, size_t n) |
| nuclear@0 | 4 { |
| nuclear@0 | 5 char *ptr = s; |
| nuclear@1 | 6 while(n--) { |
| nuclear@0 | 7 *ptr++ = c; |
| nuclear@0 | 8 } |
| nuclear@0 | 9 } |
| nuclear@1 | 10 |
| nuclear@2 | 11 void memset16(void *s, int c, size_t n) |
| nuclear@2 | 12 { |
| nuclear@2 | 13 short *ptr = s; |
| nuclear@2 | 14 while(n--) { |
| nuclear@2 | 15 *ptr++ = c; |
| nuclear@2 | 16 } |
| nuclear@2 | 17 } |
| nuclear@2 | 18 |
| nuclear@1 | 19 void *memcpy(void *dest, const void *src, size_t n) |
| nuclear@1 | 20 { |
| nuclear@1 | 21 char *dptr = dest; |
| nuclear@1 | 22 const char *sptr = src; |
| nuclear@1 | 23 |
| nuclear@1 | 24 while(n--) { |
| nuclear@1 | 25 *dptr++ = *sptr++; |
| nuclear@1 | 26 } |
| nuclear@1 | 27 return dest; |
| nuclear@1 | 28 } |
| nuclear@1 | 29 |
| nuclear@1 | 30 void *memmove(void *dest, const void *src, size_t n) |
| nuclear@1 | 31 { |
| nuclear@1 | 32 int i; |
| nuclear@1 | 33 char *dptr; |
| nuclear@1 | 34 const char *sptr; |
| nuclear@1 | 35 |
| nuclear@1 | 36 if(dest <= src) { |
| nuclear@1 | 37 /* forward copy */ |
| nuclear@1 | 38 dptr = dest; |
| nuclear@1 | 39 sptr = src; |
| nuclear@1 | 40 for(i=0; i<n; i++) { |
| nuclear@1 | 41 *dptr++ = *sptr++; |
| nuclear@1 | 42 } |
| nuclear@1 | 43 } else { |
| nuclear@1 | 44 /* backwards copy */ |
| nuclear@1 | 45 dptr = dest + n - 1; |
| nuclear@1 | 46 sptr = src + n - 1; |
| nuclear@1 | 47 for(i=0; i<n; i++) { |
| nuclear@1 | 48 *dptr-- = *sptr--; |
| nuclear@1 | 49 } |
| nuclear@1 | 50 } |
| nuclear@1 | 51 |
| nuclear@1 | 52 return dest; |
| nuclear@1 | 53 } |