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https://codeberg.org/libreboot/lbmk.git
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Leah Rowe
cec9a25c2a
clamp rand to eliminate modulo sampling; high values on the randomisation will bias the result. not really critical for mac addresses, but there's no reason not to have this. this patches reduces the chance that two libreboot users will generate the same mac addresses! Signed-off-by: Leah Rowe <leah@libreboot.org>
57 lines
1.1 KiB
C
57 lines
1.1 KiB
C
/* SPDX-License-Identifier: MIT
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* Copyright (c) 2026 Leah Rowe <leah@libreboot.org>
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*
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* Non-randomisation-related numerical functions.
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* For rand functions, see: rand.c
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*/
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#ifdef __OpenBSD__
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#include <sys/param.h>
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#endif
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#include <sys/types.h>
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#include <errno.h>
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#if !((defined(__OpenBSD__) && (OpenBSD) >= 201) || \
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defined(__FreeBSD__) || \
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defined(__NetBSD__) || defined(__APPLE__))
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#include <fcntl.h> /* if not arc4random: /dev/urandom */
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#endif
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#include <limits.h>
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#include <stddef.h>
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#include <string.h>
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#include <unistd.h>
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#include "../include/common.h"
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unsigned short
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hextonum(char ch_s)
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{
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int saved_errno = errno;
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unsigned char ch;
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size_t rval;
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ch = (unsigned char)ch_s;
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if ((unsigned int)(ch - '0') <= 9)
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return ch - '0';
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ch |= 0x20;
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if ((unsigned int)(ch - 'a') <= 5)
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return ch - 'a' + 10;
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if (ch == '?' || ch == 'x')
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return rsize(16); /* <-- with rejection sampling! */
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return 16;
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}
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void
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check_bin(size_t a, const char *a_name)
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{
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if (a > 1)
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err_no_cleanup(0, EINVAL, "%s must be 0 or 1, but is %lu",
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a_name, (size_t)a);
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}
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