/usr/include/diet/byte.h is in libowfat-dietlibc-dev 0.29-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | /* this header file comes from libowfat, http://www.fefe.de/libowfat/ */
#ifndef BYTE_H
#define BYTE_H
/* for size_t: */
#include <stddef.h>
#ifdef __cplusplus
extern "C" {
#endif
#ifndef __pure__
#define __pure__
#endif
/* byte_chr returns the smallest integer i between 0 and len-1
* inclusive such that one[i] equals needle, or len if not found. */
size_t byte_chr(const void* haystack, size_t len, char needle) __pure__;
/* byte_rchr returns the largest integer i between 0 and len-1 inclusive
* such that one[i] equals needle, or len if not found. */
size_t byte_rchr(const void* haystack,size_t len,char needle) __pure__;
/* byte_copy copies in[0] to out[0], in[1] to out[1], ... and in[len-1]
* to out[len-1]. */
void byte_copy(void* out, size_t len, const void* in);
/* byte_copyr copies in[len-1] to out[len-1], in[len-2] to out[len-2],
* ... and in[0] to out[0] */
void byte_copyr(void* out, size_t len, const void* in);
/* byte_diff returns negative, 0, or positive, depending on whether the
* string a[0], a[1], ..., a[len-1] is lexicographically smaller
* than, equal to, or greater than the string b[0], b[1], ...,
* b[len-1]. When the strings are different, byte_diff does not read
* bytes past the first difference. */
int byte_diff(const void* a, size_t len, const void* b) __pure__;
/* byte_zero sets the bytes out[0], out[1], ..., out[len-1] to 0 */
void byte_zero(void* out, size_t len);
#define byte_equal(s,n,t) (!byte_diff((s),(n),(t)))
int byte_equal_notimingattack(const void* a, size_t len,const void* b) __pure__;
#ifdef __cplusplus
}
#endif
#endif
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