111 lines
2.9 KiB
C
111 lines
2.9 KiB
C
/*
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* Copyright (c) Huawei Technologies Co., Ltd. 2014-2018. All rights reserved.
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* Description: wcstok_s function
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* Author: lishunda
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* Create: 2014-02-25
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*/
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#include "securecutil.h"
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SECUREC_INLINE int SecIsInDelimitW(wchar_t ch, const wchar_t *strDelimit) {
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const wchar_t *ctl = strDelimit;
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while (*ctl != L'\0' && *ctl != ch) {
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++ctl;
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}
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return (int)(*ctl != L'\0');
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}
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/*
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* Find beginning of token (skip over leading delimiters).
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* Note that there is no token if this loop sets string to point to the terminal
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* null.
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*/
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SECUREC_INLINE wchar_t *SecFindBeginW(wchar_t *strToken,
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const wchar_t *strDelimit) {
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wchar_t *token = strToken;
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while (*token != L'\0') {
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if (SecIsInDelimitW(*token, strDelimit)) {
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++token;
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continue;
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}
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/* Don't find any delimiter in string header, break the loop */
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break;
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}
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return token;
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}
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/*
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* Find the end of the token. If it is not the end of the string, put a null
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* there.
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*/
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SECUREC_INLINE wchar_t *SecFindRestW(wchar_t *strToken,
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const wchar_t *strDelimit) {
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wchar_t *token = strToken;
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while (*token != L'\0') {
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if (SecIsInDelimitW(*token, strDelimit)) {
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/* Find a delimiter, set string termintor */
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*token = L'\0';
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++token;
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break;
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}
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++token;
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}
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return token;
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}
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/*
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* Update Token wide character function
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*/
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SECUREC_INLINE wchar_t *SecUpdateTokenW(wchar_t *strToken,
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const wchar_t *strDelimit,
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wchar_t **context) {
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/* Point to updated position */
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wchar_t *token = SecFindRestW(strToken, strDelimit);
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/* Update the context */
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*context = token;
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/* Determine if a token has been found. */
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if (token == strToken) {
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return NULL;
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}
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return strToken;
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}
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/*
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* <NAME>
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* wcstok_s
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*
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*
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* <FUNCTION DESCRIPTION>
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* The wcstok_s function is the wide-character equivalent of the
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* strtok_s function
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*
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* <INPUT PARAMETERS>
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* strToken String containing token or tokens.
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* strDelimit Set of delimiter characters.
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* context Used to store position information between calls to
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* wcstok_s.
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*
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* <OUTPUT PARAMETERS>
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* context is updated
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* <RETURN VALUE>
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* The wcstok_s function is the wide-character equivalent of the
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* strtok_s function
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*/
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wchar_t *wcstok_s(wchar_t *strToken, const wchar_t *strDelimit,
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wchar_t **context) {
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wchar_t *orgToken = strToken;
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/* Validation section */
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if (context == NULL || strDelimit == NULL) {
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return NULL;
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}
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if (orgToken == NULL && *context == NULL) {
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return NULL;
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}
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/* If string==NULL, continue with previous string */
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if (orgToken == NULL) {
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orgToken = *context;
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}
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orgToken = SecFindBeginW(orgToken, strDelimit);
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return SecUpdateTokenW(orgToken, strDelimit, context);
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}
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