117 lines
1.6 KiB
C
117 lines
1.6 KiB
C
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/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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strtail.c
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Abstract:
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Contains:
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strtail
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ReverseString
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Author:
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Richard L. Firth (rfirth) 04-Apr-1991
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Revision History:
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--*/
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#include "nticanon.h"
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//
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// prototypes
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//
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LPTSTR
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ReverseString(
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IN OUT LPTSTR String
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);
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//
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// routines
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//
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LPTSTR
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strtail(
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IN LPTSTR str1,
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IN LPTSTR str2
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)
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/*++
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Routine Description:
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strtail returns a pointer to the longest trailing substring within str1
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consisting of characters contained in the set pointed at by str2
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Arguments:
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str1 pointer to string in which to find longest trailing substring
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str2 pointer to string of characters commprising substring
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Return Value:
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pointer to longest trailing substring or end of string
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--*/
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{
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int index;
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//
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// reverse subject string
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// get index of first non-matching character in target string
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// re-reverse subject string
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//
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ReverseString(str1);
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index = STRSPN(str1, str2);
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ReverseString(str1);
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return str1+STRLEN(str1)-index;
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}
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LPTSTR
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ReverseString(
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IN OUT LPTSTR String
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)
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/*++
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Routine Description:
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Reverses a UNICODE string (LPWSTR)
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Arguments:
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String - to be reversed. Reverses string in place
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Return Value:
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pointer to String
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--*/
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{
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DWORD len = STRLEN(String);
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DWORD i = 0;
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DWORD j = len - 1;
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TCHAR tmp;
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len /= 2;
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while (len) {
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tmp = String[i];
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String[i] = String[j];
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String[j] = tmp;
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++i;
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--j;
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--len;
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}
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return String;
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}
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