116 lines
1.7 KiB
C
116 lines
1.7 KiB
C
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#include <kern/cdef.h>
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#include <kern/clib.h>
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void
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mem_cpy(void *src, void *dst, uint64 size)
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{
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if (src == NULL || dst == NULL)
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{
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return;
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}
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char *cSrc = (char *) src;
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char *cDst = (char *) dst;
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while (size--)
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{
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*(cDst++) = *(cSrc++);
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}
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}
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void
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mem_set(void *src, uint8 val, uint64 size)
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{
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if (src == NULL)
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{
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return;
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}
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while (size--)
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{
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*(uint8 *) src = val;
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src = (void *) ((uintptr) src + 1);
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}
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}
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void
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mem_mv(void *src, void *dst, uint64 size)
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{
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if (src == NULL || dst == NULL)
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{
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return;
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}
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if (src >= dst)
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{
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mem_cpy(src, dst, size);
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return;
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}
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src = (void *) ((uintptr) src + size - 1);
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dst = (void *) ((uintptr) dst + size - 1);
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while (size--)
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{
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*(char *) dst = *(char *) src;
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dst = (void *) ((uintptr) dst - 1);
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src = (void *) ((uintptr) src - 1);
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}
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}
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//
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// Random Generator
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//
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static uint32 seed = 1;
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static uint32 max = (uint32)-1;
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uint32
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krand(void)
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{
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seed = seed * 1103512986 + 29865;
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return (unsigned int) (seed / 65536) % (max + 1);
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}
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void
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ksrand(uint32 _seed)
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{
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seed = _seed;
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}
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//
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// String Library
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//
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uint64
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str_len(char const *str)
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{
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uint64 length = 0;
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if (str == NULL)
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{
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return 0;
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}
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while (*str != 0)
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{
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str++;
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length++;
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}
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return length;
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}
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uint64
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str_cmp(char const *str1, char const *str2)
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{
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if (str1 == NULL || str2 == NULL)
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{
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return 0;
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}
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uint64 length = str_len(str1);
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if (length != str_len(str2))
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{
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return 0;
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}
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while (length--)
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{
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if (*(str1 + length) != *(str2 + length))
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{
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return 0;
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}
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}
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return 1;
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}
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