| /* |
| * Copyright (c) 2008-2012 Stefan Krah. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| |
| #include "mpdecimal.h" |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include "typearith.h" |
| #include "memory.h" |
| |
| |
| /* Guaranteed minimum allocation for a coefficient. May be changed once |
| at program start using mpd_setminalloc(). */ |
| mpd_ssize_t MPD_MINALLOC = MPD_MINALLOC_MIN; |
| |
| /* Custom allocation and free functions */ |
| void *(* mpd_mallocfunc)(size_t size) = malloc; |
| void *(* mpd_reallocfunc)(void *ptr, size_t size) = realloc; |
| void *(* mpd_callocfunc)(size_t nmemb, size_t size) = calloc; |
| void (* mpd_free)(void *ptr) = free; |
| |
| |
| /* emulate calloc if it is not available */ |
| void * |
| mpd_callocfunc_em(size_t nmemb, size_t size) |
| { |
| void *ptr; |
| size_t req; |
| mpd_size_t overflow; |
| |
| #if MPD_SIZE_MAX < SIZE_MAX |
| /* full_coverage test only */ |
| if (nmemb > MPD_SIZE_MAX || size > MPD_SIZE_MAX) { |
| return NULL; |
| } |
| #endif |
| |
| req = mul_size_t_overflow((mpd_size_t)nmemb, (mpd_size_t)size, |
| &overflow); |
| if (overflow) { |
| return NULL; |
| } |
| |
| ptr = mpd_mallocfunc(req); |
| if (ptr == NULL) { |
| return NULL; |
| } |
| /* used on uint32_t or uint64_t */ |
| memset(ptr, 0, req); |
| |
| return ptr; |
| } |
| |
| |
| /* malloc with overflow checking */ |
| void * |
| mpd_alloc(mpd_size_t nmemb, mpd_size_t size) |
| { |
| mpd_size_t req, overflow; |
| |
| req = mul_size_t_overflow(nmemb, size, &overflow); |
| if (overflow) { |
| return NULL; |
| } |
| |
| return mpd_mallocfunc(req); |
| } |
| |
| /* calloc with overflow checking */ |
| void * |
| mpd_calloc(mpd_size_t nmemb, mpd_size_t size) |
| { |
| mpd_size_t overflow; |
| |
| (void)mul_size_t_overflow(nmemb, size, &overflow); |
| if (overflow) { |
| return NULL; |
| } |
| |
| return mpd_callocfunc(nmemb, size); |
| } |
| |
| /* realloc with overflow checking */ |
| void * |
| mpd_realloc(void *ptr, mpd_size_t nmemb, mpd_size_t size, uint8_t *err) |
| { |
| void *new; |
| mpd_size_t req, overflow; |
| |
| req = mul_size_t_overflow(nmemb, size, &overflow); |
| if (overflow) { |
| *err = 1; |
| return ptr; |
| } |
| |
| new = mpd_reallocfunc(ptr, req); |
| if (new == NULL) { |
| *err = 1; |
| return ptr; |
| } |
| |
| return new; |
| } |
| |
| /* struct hack malloc with overflow checking */ |
| void * |
| mpd_sh_alloc(mpd_size_t struct_size, mpd_size_t nmemb, mpd_size_t size) |
| { |
| mpd_size_t req, overflow; |
| |
| req = mul_size_t_overflow(nmemb, size, &overflow); |
| if (overflow) { |
| return NULL; |
| } |
| |
| req = add_size_t_overflow(req, struct_size, &overflow); |
| if (overflow) { |
| return NULL; |
| } |
| |
| return mpd_mallocfunc(req); |
| } |
| |
| |
| /* Allocate a new decimal with a coefficient of length 'nwords'. In case |
| of an error the return value is NULL. */ |
| mpd_t * |
| mpd_qnew_size(mpd_ssize_t nwords) |
| { |
| mpd_t *result; |
| |
| nwords = (nwords < MPD_MINALLOC) ? MPD_MINALLOC : nwords; |
| |
| result = mpd_alloc(1, sizeof *result); |
| if (result == NULL) { |
| return NULL; |
| } |
| |
| result->data = mpd_alloc(nwords, sizeof *result->data); |
| if (result->data == NULL) { |
| mpd_free(result); |
| return NULL; |
| } |
| |
| result->flags = 0; |
| result->exp = 0; |
| result->digits = 0; |
| result->len = 0; |
| result->alloc = nwords; |
| |
| return result; |
| } |
| |
| /* Allocate a new decimal with a coefficient of length MPD_MINALLOC. |
| In case of an error the return value is NULL. */ |
| mpd_t * |
| mpd_qnew(void) |
| { |
| return mpd_qnew_size(MPD_MINALLOC); |
| } |
| |
| /* Allocate new decimal. Caller can check for NULL or MPD_Malloc_error. |
| Raises on error. */ |
| mpd_t * |
| mpd_new(mpd_context_t *ctx) |
| { |
| mpd_t *result; |
| |
| result = mpd_qnew(); |
| if (result == NULL) { |
| mpd_addstatus_raise(ctx, MPD_Malloc_error); |
| } |
| return result; |
| } |
| |
| /* |
| * Input: 'result' is a static mpd_t with a static coefficient. |
| * Assumption: 'nwords' >= result->alloc. |
| * |
| * Resize the static coefficient to a larger dynamic one and copy the |
| * existing data. If successful, the value of 'result' is unchanged. |
| * Otherwise, set 'result' to NaN and update 'status' with MPD_Malloc_error. |
| */ |
| int |
| mpd_switch_to_dyn(mpd_t *result, mpd_ssize_t nwords, uint32_t *status) |
| { |
| mpd_uint_t *p = result->data; |
| |
| assert(nwords >= result->alloc); |
| |
| result->data = mpd_alloc(nwords, sizeof *result->data); |
| if (result->data == NULL) { |
| result->data = p; |
| mpd_set_qnan(result); |
| mpd_set_positive(result); |
| result->exp = result->digits = result->len = 0; |
| *status |= MPD_Malloc_error; |
| return 0; |
| } |
| |
| memcpy(result->data, p, result->len * (sizeof *result->data)); |
| result->alloc = nwords; |
| mpd_set_dynamic_data(result); |
| return 1; |
| } |
| |
| /* |
| * Input: 'result' is a static mpd_t with a static coefficient. |
| * |
| * Convert the coefficient to a dynamic one that is initialized to zero. If |
| * malloc fails, set 'result' to NaN and update 'status' with MPD_Malloc_error. |
| */ |
| int |
| mpd_switch_to_dyn_zero(mpd_t *result, mpd_ssize_t nwords, uint32_t *status) |
| { |
| mpd_uint_t *p = result->data; |
| |
| result->data = mpd_calloc(nwords, sizeof *result->data); |
| if (result->data == NULL) { |
| result->data = p; |
| mpd_set_qnan(result); |
| mpd_set_positive(result); |
| result->exp = result->digits = result->len = 0; |
| *status |= MPD_Malloc_error; |
| return 0; |
| } |
| |
| result->alloc = nwords; |
| mpd_set_dynamic_data(result); |
| |
| return 1; |
| } |
| |
| /* |
| * Input: 'result' is a static or a dynamic mpd_t with a dynamic coefficient. |
| * Resize the coefficient to length 'nwords': |
| * Case nwords > result->alloc: |
| * If realloc is successful: |
| * 'result' has a larger coefficient but the same value. Return 1. |
| * Otherwise: |
| * Set 'result' to NaN, update status with MPD_Malloc_error and return 0. |
| * Case nwords < result->alloc: |
| * If realloc is successful: |
| * 'result' has a smaller coefficient. result->len is undefined. Return 1. |
| * Otherwise (unlikely): |
| * 'result' is unchanged. Reuse the now oversized coefficient. Return 1. |
| */ |
| int |
| mpd_realloc_dyn(mpd_t *result, mpd_ssize_t nwords, uint32_t *status) |
| { |
| uint8_t err = 0; |
| |
| result->data = mpd_realloc(result->data, nwords, sizeof *result->data, &err); |
| if (!err) { |
| result->alloc = nwords; |
| } |
| else if (nwords > result->alloc) { |
| mpd_set_qnan(result); |
| mpd_set_positive(result); |
| result->exp = result->digits = result->len = 0; |
| *status |= MPD_Malloc_error; |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| |