330 lines
9.4 KiB
C
330 lines
9.4 KiB
C
/* ----> DO NOT REMOVE THE FOLLOWING NOTICE <----
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Copyright (c) 2014-2015 Datalight, Inc.
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All Rights Reserved Worldwide.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; use version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but "AS-IS," WITHOUT ANY WARRANTY; without even the implied warranty
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of 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 along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/* Businesses and individuals that for commercial or other reasons cannot
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comply with the terms of the GPLv2 license may obtain a commercial license
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before incorporating Reliance Edge into proprietary software for
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distribution in any form. Visit http://www.datalight.com/reliance-edge for
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more information.
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*/
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/** @file
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@brief Default implementations of string manipulation functions.
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These implementations are intended to be small and simple, and thus forego
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all optimizations. If the C library is available, or if there are better
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third-party implementations available in the system, those can be used
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instead by defining the appropriate macros in redconf.h.
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These functions are not intended to be completely 100% ANSI C compatible
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implementations, but rather are designed to meet the needs of Reliance Edge.
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The compatibility is close enough that ANSI C compatible implementations
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can be "dropped in" as replacements without difficulty.
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*/
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#include <redfs.h>
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#ifndef RedStrLenUnchecked
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static uint32_t RedStrLenUnchecked(const char *pszStr);
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#endif
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#ifndef RedStrCmpUnchecked
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static int32_t RedStrCmpUnchecked(const char *pszStr1, const char *pszStr2);
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#endif
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#ifndef RedStrNCmpUnchecked
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static int32_t RedStrNCmpUnchecked(const char *pszStr1, const char *pszStr2, uint32_t ulLen);
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#endif
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#ifndef RedStrNCpyUnchecked
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static void RedStrNCpyUnchecked(char *pszDst, const char *pszSrc, uint32_t ulLen);
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#endif
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/** @brief Determine the length (in bytes) of a null terminated string.
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The length does not include the null terminator byte.
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@param pszStr The null terminated string whose length is to be determined.
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@return The length of the @p pszStr string.
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*/
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uint32_t RedStrLen(
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const char *pszStr)
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{
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uint32_t ulLen;
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if(pszStr == NULL)
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{
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REDERROR();
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ulLen = 0U;
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}
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else
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{
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/* Cast the result to uint32_t, since RedStrLenUnchecked() might be
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strlen(), which returns size_t, which is possibly a 64-bit value.
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*/
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ulLen = (uint32_t)RedStrLenUnchecked(pszStr);
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}
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return ulLen;
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}
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#ifndef RedStrLenUnchecked
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/** @brief Determine the length (in bytes) of a null terminated string.
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@param pszStr The null terminated string whose length is to be determined.
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@return The length of the @p pszStr string.
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*/
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static uint32_t RedStrLenUnchecked(
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const char *pszStr)
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{
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uint32_t ulLen = 0U;
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while(pszStr[ulLen] != '\0')
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{
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ulLen++;
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}
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return ulLen;
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}
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#endif
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/** @brief Compare two null terminated strings.
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@param pszStr1 The first string to compare.
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@param pszStr2 The second string to compare.
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@return Zero if the two strings are the same, otherwise nonzero.
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@retval 0 @p pszStr1 and @p pszStr2 are the same.
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@retval 1 @p pszStr1 is greater than @p pszStr2, as determined by the
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values of the first differing bytes.
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@retval -1 @p pszStr2 is greater than @p pszStr1, as determined by the
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values of the first differing bytes.
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*/
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int32_t RedStrCmp(
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const char *pszStr1,
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const char *pszStr2)
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{
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int32_t lResult;
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if((pszStr1 == NULL) || (pszStr2 == NULL))
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{
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REDERROR();
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lResult = 0;
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}
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else
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{
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lResult = RedStrCmpUnchecked(pszStr1, pszStr2);
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}
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return lResult;
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}
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#ifndef RedStrCmpUnchecked
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/** @brief Compare two null terminated strings.
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@param pszStr1 The first string to compare.
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@param pszStr2 The second string to compare.
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@return Zero if the two strings are the same, otherwise nonzero.
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*/
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static int32_t RedStrCmpUnchecked(
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const char *pszStr1,
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const char *pszStr2)
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{
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int32_t lResult;
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uint32_t ulIdx = 0U;
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while((pszStr1[ulIdx] == pszStr2[ulIdx]) && (pszStr1[ulIdx] != '\0'))
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{
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ulIdx++;
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}
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/* "The sign of a non-zero return value is determined by the sign of the
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difference between the values of the first pair of bytes (both
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interpreted as type unsigned char) that differ in the strings being
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compared." Use uint8_t instead of unsigned char to avoid MISRA C
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deviations.
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*/
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if((uint8_t)pszStr1[ulIdx] > (uint8_t)pszStr2[ulIdx])
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{
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lResult = 1;
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}
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else if((uint8_t)pszStr1[ulIdx] < (uint8_t)pszStr2[ulIdx])
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{
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lResult = -1;
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}
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else
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{
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lResult = 0;
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}
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return lResult;
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}
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#endif
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/** @brief Compare the first @p ulLen characters of two null terminated strings.
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@param pszStr1 The first string to compare.
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@param pszStr2 The second string to compare.
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@param ulLen The maximum length to compare. The comparison stops when
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either of the strings end or when @p ulLen bytes have been
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compared.
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@return Zero if the two strings are the same, otherwise nonzero.
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@retval 0 @p pszStr1 and @p pszStr2 are the same.
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@retval 1 @p pszStr1 is greater than @p pszStr2, as determined by the
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values of the first differing bytes.
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@retval -1 @p pszStr2 is greater than @p pszStr1, as determined by the
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values of the first differing bytes.
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*/
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int32_t RedStrNCmp(
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const char *pszStr1,
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const char *pszStr2,
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uint32_t ulLen)
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{
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int32_t lResult;
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if((pszStr1 == NULL) || (pszStr2 == NULL))
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{
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REDERROR();
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lResult = 0;
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}
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else
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{
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lResult = RedStrNCmpUnchecked(pszStr1, pszStr2, ulLen);
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}
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return lResult;
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}
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#ifndef RedStrNCmpUnchecked
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/** @brief Compare the first @p ulLen characters of two null terminated strings.
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@param pszStr1 The first string to compare.
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@param pszStr2 The second string to compare.
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@param ulLen The maximum length to compare. The comparison stops when
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either of the strings end or when @p ulLen bytes have been
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compared.
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@return Zero if the two strings are the same, otherwise nonzero.
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*/
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static int32_t RedStrNCmpUnchecked(
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const char *pszStr1,
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const char *pszStr2,
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uint32_t ulLen)
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{
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int32_t lResult = 0;
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uint32_t ulIdx;
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for(ulIdx = 0U; ulIdx < ulLen; ulIdx++)
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{
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if(pszStr1[ulIdx] != pszStr2[ulIdx])
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{
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/* "The sign of a non-zero return value is determined by the sign
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of the difference between the values of the first pair of bytes
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(both interpreted as type unsigned char) that differ in the
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strings being compared." Use uint8_t instead of unsigned char
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to avoid MISRA C deviations.
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*/
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if((uint8_t)pszStr1[ulIdx] > (uint8_t)pszStr2[ulIdx])
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{
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lResult = 1;
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}
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else
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{
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lResult = -1;
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}
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}
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if((lResult != 0) || (pszStr1[ulIdx] == '\0'))
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{
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break;
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}
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}
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return lResult;
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}
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#endif
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/** @brief Copy a string.
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Copy up to @p ulLen bytes of a null-terminated string (@p pszSrc) to a
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destination buffer (@p pszDst). The result will not be null-terminated if
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@p pszSrc is longer than @p ulLen - 1 bytes.
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If @p pszSrc is shorter than @p ulLen - 1 bytes, the remainder of @p pszDst
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will be filled with null bytes.
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@param pszDst The destination buffer, which is at least @p ulLen bytes
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in size.
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@param pszSrc The null-terminated string to copy.
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@param ulLen The maximum number of characters to copy.
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*/
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void RedStrNCpy(
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char *pszDst,
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const char *pszSrc,
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uint32_t ulLen)
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{
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if((pszDst == NULL) || (pszSrc == NULL))
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{
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REDERROR();
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}
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else
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{
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RedStrNCpyUnchecked(pszDst, pszSrc, ulLen);
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}
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}
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#ifndef RedStrNCpyUnchecked
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/** @brief Copy a string.
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@param pszDst The destination buffer, which is at least @p ulLen bytes
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in size.
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@param pszSrc The null-terminated string to copy.
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@param ulLen The maximum number of characters to copy.
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*/
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static void RedStrNCpyUnchecked(
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char *pszDst,
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const char *pszSrc,
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uint32_t ulLen)
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{
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uint32_t ulIdx = 0U;
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while((ulIdx < ulLen) && (pszSrc[ulIdx] != '\0'))
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{
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pszDst[ulIdx] = pszSrc[ulIdx];
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ulIdx++;
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}
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while(ulIdx < ulLen)
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{
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pszDst[ulIdx] = '\0';
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ulIdx++;
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}
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}
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#endif
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