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-rw-r--r--Modules/_decimal/libmpdec/memory.c292
1 files changed, 292 insertions, 0 deletions
diff --git a/Modules/_decimal/libmpdec/memory.c b/Modules/_decimal/libmpdec/memory.c
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+++ b/Modules/_decimal/libmpdec/memory.c
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+/*
+ * 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->alloc * (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;
+}
+
+
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