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98 lines
2.3 KiB
98 lines
2.3 KiB
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/*************************************************************************
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*
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* DBCS.C
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*
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* DBCS routines, ported from DOS
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*
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* Copyright (c) 1995 Microsoft Corporation
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*
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* $Log: N:\NT\PRIVATE\NW4\NWSCRIPT\VCS\DBCS.C $
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*
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* Rev 1.1 22 Dec 1995 14:24:10 terryt
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* Add Microsoft headers
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*
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* Rev 1.0 15 Nov 1995 18:06:44 terryt
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* Initial revision.
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*
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* Rev 1.1 25 Aug 1995 16:22:26 terryt
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* Capture support
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*
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* Rev 1.0 15 May 1995 19:10:24 terryt
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* Initial revision.
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*
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*************************************************************************/
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/*
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** dbcs.c - DBCS functions for DOS apps.
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**
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** Written by RokaH and DavidDi.
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*/
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/* Headers
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**********/
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// IsDBCSLeadByte taken out of NT because there is one built in.
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// I left the Next and Prev in because I don't know whether this
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// algorithm is "safer" than the built in code.
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#include "common.h"
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/*
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** unsigned char *NWAnsiNext(unsigned char *puch);
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**
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** Moves to the next character in a string.
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**
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** Arguments: puch - pointer to current location in string
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**
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** Returns: char * - Pointer to next character in string.
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**
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** Globals: none
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**
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** N.b., if puch points to a null character, NWAnsiNext() will return puch.
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*/
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unsigned char *NWAnsiNext(unsigned char *puch)
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{
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if (*puch == '\0')
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return(puch);
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else if (IsDBCSLeadByte(*puch))
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puch++;
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puch++;
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return(puch);
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}
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/*
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** unsigned char *NWAnsiPrev(unsigned char *psz, unsigned char *puch);
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**
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** Moves back one character in a string.
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**
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** Arguments: psz - pointer to start of string
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** puch - pointer to current location in string
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**
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** Returns: char * - Pointer to previous character in string.
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**
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** Globals: none
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**
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** N.b., if puch <= psz, NWAnsiPrev() will return psz.
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**
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** This function is implemented in a very slow fashion because we do not wish
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** to trust that the given string is necessarily DBCS "safe," i.e., contains
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** only single-byte characters and valid DBCS characters. So we start from
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** the beginning of the string and work our way forward.
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*/
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unsigned char *NWAnsiPrev(unsigned char *psz, unsigned char *puch)
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{
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unsigned char *puchPrevious;
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do
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{
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puchPrevious = psz;
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psz = NWAnsiNext(psz);
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} while (*psz != '\0' && psz < puch);
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return(puchPrevious);
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}
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