mirror of
https://github.com/freebsd/freebsd-src
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141 lines
2.7 KiB
C
141 lines
2.7 KiB
C
/* $OpenBSD: mem.c,v 1.6 2014/12/01 13:13:00 deraadt Exp $ */
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/*
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* Copyright (c) 2003, Otto Moerbeek <otto@drijf.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/cdefs.h>
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#include <openssl/err.h>
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#include <err.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include "extern.h"
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struct number *
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new_number(void)
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{
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struct number *n;
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n = bmalloc(sizeof(*n));
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n->scale = 0;
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n->number = BN_new();
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if (n->number == NULL)
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err(1, NULL);
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return (n);
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}
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void
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free_number(struct number *n)
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{
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BN_free(n->number);
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free(n);
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}
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/*
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* Divide dividend by divisor, returning the result. Retain bscale places of
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* precision.
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* The result must be freed when no longer in use
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*/
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struct number *
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div_number(struct number *dividend, struct number *divisor, u_int bscale)
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{
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struct number *quotient;
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BN_CTX *ctx;
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u_int scale;
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quotient = new_number();
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quotient->scale = bscale;
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scale = max(divisor->scale, dividend->scale);
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if (BN_is_zero(divisor->number))
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warnx("divide by zero");
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else {
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normalize(divisor, scale);
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normalize(dividend, scale + quotient->scale);
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ctx = BN_CTX_new();
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bn_checkp(ctx);
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bn_check(BN_div(quotient->number, NULL, dividend->number,
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divisor->number, ctx));
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BN_CTX_free(ctx);
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}
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return (quotient);
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}
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struct number *
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dup_number(const struct number *a)
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{
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struct number *n;
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n = bmalloc(sizeof(*n));
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n->scale = a->scale;
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n->number = BN_dup(a->number);
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bn_checkp(n->number);
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return (n);
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}
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void *
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bmalloc(size_t sz)
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{
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void *p;
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p = malloc(sz);
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if (p == NULL)
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err(1, NULL);
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return (p);
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}
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void *
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breallocarray(void *p, size_t nmemb, size_t size)
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{
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void *q;
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q = reallocarray(p, nmemb, size);
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if (q == NULL)
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err(1, NULL);
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return (q);
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}
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char *
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bstrdup(const char *p)
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{
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char *q;
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q = strdup(p);
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if (q == NULL)
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err(1, NULL);
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return (q);
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}
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void
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bn_check(int x) \
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{
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if (x == 0)
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err(1, "big number failure %lx", ERR_get_error());
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}
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void
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bn_checkp(const void *p) \
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{
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if (p == NULL)
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err(1, "allocation failure %lx", ERR_get_error());
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}
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