108 lines
3.2 KiB
C
108 lines
3.2 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <hv_lib.h>
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#include <acrn_common.h>
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#include <hv_arch.h>
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#include <hv_debug.h>
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/*
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* strncpy_s
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*
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* description:
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* This function copies maximum 'slen'characters from string pointed
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* by s to a buffer pointed by d.
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*
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* input:
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* d pointer to dest buffer.
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*
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* dmax maximum length of dest buffer.
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*
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* s pointer to the source string.
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*
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* slen the maximum number of characters to copy from source
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* string.
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*
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* return value:
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* dest pointer to dest string if source string is copied
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* successfully, or else return null.
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*
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* notes:
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* 1) both dmax and slen should not be 0.
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* 2) both d and s should not be null pointers.
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* 3) will assert() if overlap happens or dest buffer has no
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* enough space.
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*/
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char *strncpy_s(char *d, size_t dmax, const char *s, size_t slen)
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{
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char *dest_base;
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size_t dest_avail;
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uint64_t overlap_guard;
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ASSERT((d != NULL) && (s != NULL), "invlaid input d or s");
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ASSERT((dmax != 0) && (slen != 0), "invlaid input dmax or slen");
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if (d == s)
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return d;
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overlap_guard = (uint64_t)((d > s) ? (d - s - 1) : (s - d - 1));
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dest_base = d;
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dest_avail = dmax;
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while (dest_avail > 0) {
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ASSERT(overlap_guard != 0, "overlap happened.");
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if (slen == 0) {
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*d = '\0';
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return dest_base;
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}
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*d = *s;
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if (*d == '\0')
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return dest_base;
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d++;
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s++;
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slen--;
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dest_avail--;
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overlap_guard--;
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}
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ASSERT(false, "dest buffer has no enough space.");
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/*
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* to avoid a string that is not
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* null-terminated in dest buffer
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*/
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dest_base[dmax - 1] = '\0';
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return NULL;
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}
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