skarg
113 lines
3.1 KiB
C
113 lines
3.1 KiB
C
/*####COPYRIGHTBEGIN####
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-------------------------------------------
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Copyright (C) 2008 Steve Karg
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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The Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA.
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As a special exception, if other files instantiate templates or
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use macros or inline functions from this file, or you compile
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this file and link it with other works to produce a work based
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on this file, this file does not by itself cause the resulting
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work to be covered by the GNU General Public License. However
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the source code for this file must still be made available in
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accordance with section (3) of the GNU General Public License.
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This exception does not invalidate any other reasons why a work
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based on this file might be covered by the GNU General Public
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License.
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-------------------------------------------
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####COPYRIGHTEND####*/
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#include <stddef.h>
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#include "memcopy.h"
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/** @file memcopy.c Custom memcopy function */
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/* copy len bytes from src to offset of dest if there is enough space. */
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/* returns 0 if there is not enough space, or the number of bytes copied. */
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size_t memcopy(
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void *dest,
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void *src,
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size_t offset, /* where in dest to put the data */
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size_t len, /* amount of data to copy */
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size_t max)
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{ /* total size of destination */
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size_t i;
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size_t copy_len = 0;
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char *s1, *s2;
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s1 = dest;
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s2 = src;
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if (len <= (max - offset)) {
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for (i = 0; i < len; i++) {
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s1[offset + i] = s2[i];
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copy_len++;
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}
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}
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return copy_len;
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}
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#ifdef TEST
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#include <assert.h>
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#include <string.h>
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#include "ctest.h"
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void test_memcopy(
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Test * pTest)
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{
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char *data1 = "Joshua";
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char *data2 = "Anna";
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char buffer[480] = "";
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char big_buffer[480] = "";
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size_t len = 0;
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len = memcopy(&buffer[0], &data1[0], 0, sizeof(data1), sizeof(buffer));
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ct_test(pTest, len == sizeof(data1));
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ct_test(pTest, memcmp(&buffer[0], &data1[0], len) == 0);
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len = memcopy(&buffer[0], &data2[0], len, sizeof(data2), sizeof(buffer));
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ct_test(pTest, len == sizeof(data2));
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len =
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memcopy(&buffer[0], &big_buffer[0], 1, sizeof(big_buffer),
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sizeof(buffer));
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ct_test(pTest, len == 0);
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}
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#ifdef TEST_MEM_COPY
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int main(
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void)
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{
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Test *pTest;
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bool rc;
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pTest = ct_create("Memory Copy", NULL);
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/* individual tests */
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rc = ct_addTestFunction(pTest, test_memcopy);
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assert(rc);
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ct_setStream(pTest, stdout);
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ct_run(pTest);
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(void) ct_report(pTest);
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ct_destroy(pTest);
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return 0;
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}
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#endif
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#endif /* TEST */
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