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https://codeberg.org/libreboot/lbmk.git
synced 2026-07-11 05:52:36 +02:00
Leah Rowe
861f56375a
i wasn't using strict mode enough in make: make strict now it compiles cleanly. mostly removing unused variables, fixing implicit conversions, etc. Signed-off-by: Leah Rowe <leah@libreboot.org>
117 lines
2.2 KiB
C
117 lines
2.2 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 <ctype.h>
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#include <limits.h>
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#include <stddef.h>
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#include <stdio.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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unsigned char ch;
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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') /* random */
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return (short)rsize(16); /* <-- with rejection sampling! */
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return 16;
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}
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/* basically hexdump -C */
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/*
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TODO: optimise this
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write a full util for hexdump
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how to optimise:
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don't call print tens of thousands of times!
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convert the numbers manually, and cache everything
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in a BUFSIZ sized buffer, with everything properly
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aligned. i worked out that i could fit 79 rows
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in a 8KB buffer (1264 bytes of numbers represented
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as strings in hex)
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this depends on the OS, and would be calculated at
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runtime.
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then:
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don't use printf. just write it to stdout (basically
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a simple cat implementation)
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*/
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void
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spew_hex(const void *data, size_t len)
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{
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const unsigned char *buf = (const unsigned char *)data;
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unsigned char c;
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size_t i;
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size_t j;
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if (buf == NULL ||
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len == 0)
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return;
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for (i = 0; i < len; i += 16) {
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if (len <= 4294967296) /* below 4GB */
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printf("%08zx ", i);
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else
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printf("%16zu ", i);
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for (j = 0; j < 16; j++) {
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if (i + j < len)
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printf("%02x ", buf[i + j]);
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else
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printf(" ");
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if (j == 7)
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printf(" ");
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}
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printf(" |");
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for (j = 0; j < 16 && i + j < len; j++) {
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c = buf[i + j];
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printf("%c", isprint(c) ? c : '.');
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}
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printf("|\n");
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}
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printf("%08zx\n", len);
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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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exitf("%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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