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183 lines
6.2 KiB
183 lines
6.2 KiB
/***
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*strlwr.c - routine to map upper-case characters in a string to lower-case
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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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* Converts all the upper case characters in a string to lower case,
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* in place.
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*
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*Revision History:
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* 05-31-89 JCR C version created.
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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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* 09-18-91 ETC Locale support under _INTL switch.
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* 12-08-91 ETC Updated nlsapi; added multithread.
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* 08-19-92 KRS Activated NLS support.
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* 08-22-92 SRW Allow INTL definition to be conditional for building
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* ntcrt.lib
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* 09-02-92 SRW Get _INTL definition via ..\crt32.def
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 06-01-93 CFW Simplify "C" locale test.
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* 06-02-93 SRW ignore _INTL if _NTSUBSET_ defined.
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* 09-15-93 CFW Use ANSI conformant "__" names.
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* 09-16-93 GJF Merged NT SDK and Cuda versions.
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* 09-22-93 CFW Use __crtxxx internal NLS API wrapper.
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* 11-09-93 CFW Add code page for __crtxxx().
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* 09-06-94 CFW Remove _INTL switch.
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* 10-24-94 GJF Sped up C locale, multi-thread case.
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* 12-29-94 CFW Merge non-Win32.
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* 01-10-95 CFW Debug CRT allocs.
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* 09-26-95 GJF New locking macro, and scheme, for functions which
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* reference the locale.
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* 03-17-97 RDK Added error flag to __crtLCMapStringA.
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* 08-11-98 GJF Revised multithread support based on threadlocinfo
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* struct. Also, use _alloca instead of _malloc_crt.
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* 05-17-99 PML Remove all Macintosh support.
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* 12-10-99 GB Added support for recovery from stack overflow around
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* _alloca().
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* 05-01-00 BWT Fix Posix.
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* 03-13-01 PML Fix memory leak if _alloca failed (vs7#224860)
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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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#include <malloc.h>
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#include <locale.h>
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#include <setlocal.h>
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#include <limits.h> /* for INT_MAX */
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#include <mtdll.h>
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#include <awint.h>
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#include <dbgint.h>
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/***
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*char *_strlwr(string) - map upper-case characters in a string to lower-case
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*
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*Purpose:
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* _strlwr() converts upper-case characters in a null-terminated string
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* to their lower-case equivalents. Conversion is done in place and
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* characters other than upper-case letters are not modified.
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*
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* In the C locale, this function modifies only 7-bit ASCII characters
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* in the range 0x41 through 0x5A ('A' through 'Z').
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*
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* If the locale is not the 'C' locale, LCMapString() is used to do
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* the work. Assumes enough space in the string to hold result.
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*
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*Entry:
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* char *string - string to change to lower case
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*
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*Exit:
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* input string address
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*
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*Exceptions:
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* The original string is returned unchanged on any error.
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*
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*******************************************************************************/
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char * __cdecl _strlwr (
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char * string
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)
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{
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#if !defined(_NTSUBSET_) && !defined(_POSIX_)
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int dstlen; /* len of dst string, with null */
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unsigned char *dst; /* destination string */
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int malloc_flag = 0;
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#ifdef _MT
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pthreadlocinfo ptloci = _getptd()->ptlocinfo;
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if ( ptloci != __ptlocinfo )
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ptloci = __updatetlocinfo();
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if ( ptloci->lc_handle[LC_CTYPE] == _CLOCALEHANDLE )
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#else
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if ( __lc_handle[LC_CTYPE] == _CLOCALEHANDLE )
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#endif
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{
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char *cp; /* traverses string for C locale conversion */
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for ( cp = string ; *cp ; ++cp )
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if ( ('A' <= *cp) && (*cp <= 'Z') )
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*cp -= 'A' - 'a';
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return(string);
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} /* C locale */
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/* Inquire size of dst string */
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#ifdef _MT
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if ( 0 == (dstlen = __crtLCMapStringA( ptloci->lc_handle[LC_CTYPE],
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#else
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if ( 0 == (dstlen = __crtLCMapStringA( __lc_handle[LC_CTYPE],
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#endif
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LCMAP_LOWERCASE,
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string,
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-1,
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NULL,
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0,
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#ifdef _MT
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ptloci->lc_codepage,
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#else
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__lc_codepage,
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#endif
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TRUE )) )
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return(string);
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/* Allocate space for dst */
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__try {
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dst = (unsigned char *)_alloca(dstlen * sizeof(unsigned char));
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}
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__except( EXCEPTION_EXECUTE_HANDLER )
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{
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_resetstkoflw();
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dst = NULL;
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}
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if ( dst == NULL ) {
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dst = (unsigned char *)_malloc_crt(dstlen * sizeof(unsigned char));
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malloc_flag++;
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}
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/* Map src string to dst string in alternate case */
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if ( (dst != NULL) &&
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#ifdef _MT
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(__crtLCMapStringA( ptloci->lc_handle[LC_CTYPE],
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#else
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(__crtLCMapStringA( __lc_handle[LC_CTYPE],
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#endif
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LCMAP_LOWERCASE,
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string,
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-1,
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dst,
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dstlen,
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#ifdef _MT
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ptloci->lc_codepage,
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#else
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__lc_codepage,
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#endif
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TRUE ) != 0) )
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/* copy dst string to return string */
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strcpy(string, dst);
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if ( malloc_flag )
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_free_crt(dst);
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return(string);
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#else
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char * cp;
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for (cp=string; *cp; ++cp)
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{
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if ('A' <= *cp && *cp <= 'Z')
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*cp += 'a' - 'A';
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}
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return(string);
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#endif
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}
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