diff options
author | Nicholas <nbnoll@eml.cc> | 2021-11-12 09:22:01 -0800 |
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committer | Nicholas <nbnoll@eml.cc> | 2021-11-12 09:22:01 -0800 |
commit | ce05175372a9ddca1a225db0765ace1127a39293 (patch) | |
tree | 5988b4d4f6b402e4953945886fc90aae11203df6 /src/libc/string.c | |
parent | b375f3cdedb5b0e08745d100b40e38d2f8396a58 (diff) |
chore: simplified organizational structurelaptop
Diffstat (limited to 'src/libc/string.c')
-rw-r--r-- | src/libc/string.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/src/libc/string.c b/src/libc/string.c new file mode 100644 index 0000000..0e41efa --- /dev/null +++ b/src/libc/string.c @@ -0,0 +1,80 @@ +#include <u.h> +#include <libc.h> + +void* +memcopy(void *dst, void *src, intptr n) +{ + byte *e, *s, *d; + + d = dst; + e = d + n; + for (s = src ; d != e; ++s, ++d) { + *d = *s; + } + + return dst; +} + +void* +memmove(void *dst, void *src, intptr n) +{ + byte *e, *s, *d; + s = src; + d = dst; + + if (d < s) { + e = d + n; + for (; d != e; ++s, ++d) + *d = *s; + + } else { + e = d; + d += n; + s += n; + for (; d != e; --s, --d) + d[-1] = s[-1]; + } + + return dst; +} + +void* +memset(void *buf, int val, intptr n) +{ + byte *b, *e; + b = buf; + e = b + n; + for (; b != e; b++) { + *b = (byte)val; + } + + return buf; +} + +int +memcmp(void *lhs, void *rhs, intptr n) +{ + byte *bl, *br, *e; + + br = rhs; + e = br + n; + for (bl = lhs; br != e; ++bl, ++br) { + if (*bl < *br) + return -1; + else if (*bl > *br) + return 1; + } + + return 0; +} + +int +strlen(byte* s) +{ + byte* b; + for (b = s; *b; b++) { + ; + } + + return b - s; +} |