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#include "byte.h" /** @file byte.c @author djb @brief byte manipulation functions */ unsigned int byte_chr(char *s,register unsigned int n,int c) { register char ch; register char *t; ch = c; t = s; for (;;) { if (!n) { break; } if (*t == ch) { break; } ++t; --n; if (!n) { break; } if (*t == ch) { break; } ++t; --n; if (!n) { break; } if (*t == ch) { break; } ++t; --n; if (!n) { break; } if (*t == ch) { break; } ++t; --n; } return t - s; } void byte_copy(register char *to,register unsigned int n,register char *from) { for (;;) { if (!n) { return; } *to++ = *from++; --n; if (!n) { return; } *to++ = *from++; --n; if (!n) { return; } *to++ = *from++; --n; if (!n) { return; } *to++ = *from++; --n; } } void byte_copyr(register char *to,register unsigned int n,register char *from) { to += n; from += n; for (;;) { if (!n) { return; } *--to = *--from; --n; if (!n) { return; } *--to = *--from; --n; if (!n) { return; } *--to = *--from; --n; if (!n) { return; } *--to = *--from; --n; } } int byte_diff(register char *s,register unsigned int n,register char *t) { for (;;) { if (!n) { return 0; } if (*s != *t) { break; } ++s; ++t; --n; if (!n) { return 0; } if (*s != *t) { break; } ++s; ++t; --n; if (!n) { return 0; } if (*s != *t) { break; } ++s; ++t; --n; if (!n) { return 0; } if (*s != *t) { break; } ++s; ++t; --n; } return ((int)(unsigned int)(unsigned char) *s) - ((int)(unsigned int)(unsigned char) *t); } unsigned int byte_rchr(char *s,register unsigned int n,int c) { register char ch; register char *t; register char *u; ch = c; t = s; u = 0; for (;;) { if (!n) { break; } if (*t == ch) { u = t; } ++t; --n; if (!n) { break; } if (*t == ch) { u = t; } ++t; --n; if (!n) { break; } if (*t == ch) { u = t; } ++t; --n; if (!n) { break; } if (*t == ch) { u = t; } ++t; --n; } if (!u) { u = t; } return u - s; } void byte_zero(char *s,register unsigned int n) { for (;;) { if (!n) { break; } *s++ = 0; --n; if (!n) { break; } *s++ = 0; --n; if (!n) { break; } *s++ = 0; --n; if (!n) { break; } *s++ = 0; --n; } } void byte_fill(char *s,register unsigned int n,const int c) { register char ch; ch = c; for (;;) { if (!n) { break; } *s++ = ch; --n; if (!n) { break; } *s++ = ch; --n; if (!n) { break; } *s++ = ch; --n; if (!n) { break; } *s++ = ch; --n; } }