60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
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/***
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*strrev.c - reverse a string in place
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*
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* Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines _strrev() - reverse a string in place (not including
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* '\0' character)
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*
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*Revision History:
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* 02-27-90 GJF Fixed calling type, #include <cruntime.h>, fixed
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* copyright.
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* 10-02-90 GJF New-style function declarator.
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* 01-18-91 GJF ANSI naming.
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* 09-03-93 GJF Replaced _CALLTYPE1 with __cdecl.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <string.h>
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/***
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*char *_strrev(string) - reverse a string in place
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*
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*Purpose:
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* Reverses the order of characters in the string. The terminating
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* null character remains in place.
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*
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*Entry:
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* char *string - string to reverse
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*
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*Exit:
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* returns string - now with reversed characters
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*
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*Exceptions:
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*
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*******************************************************************************/
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char * __cdecl _strrev (
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char * string
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)
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{
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char *start = string;
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char *left = string;
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char ch;
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while (*string++) /* find end of string */
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;
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string -= 2;
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while (left < string)
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{
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ch = *left;
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*left++ = *string;
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*string-- = ch;
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}
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return(start);
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}
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