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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/alg/bisectleft.h Normal file
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#ifndef COSMOPOLITAN_LIBC_ALG_BISECTLEFT_H_
#define COSMOPOLITAN_LIBC_ALG_BISECTLEFT_H_
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
forceinline size_t bisectleft(const void *key, const void *base, size_t count,
size_t sz, int cmp(const void *, const void *)) {
size_t m, l, r;
l = 0;
r = count;
while (l < r) {
m = (l + r) >> 1;
if (cmp((char *)base + m * sz, key) < 0) {
l = m + 1;
} else {
r = m;
}
}
if (l && (l == count || cmp((char *)base + l * sz, key) > 0)) {
l--;
}
return l;
}
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_ALG_BISECTLEFT_H_ */