83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
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/***
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*wtof.c - convert wchar_t string to floating point number
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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 a wide character string into a floating point number.
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*
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*Revision History:
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* 05-18-00 GB written.
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* 08-29-00 GB Fixed buffer overrun.
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* 02-19-01 GB added _alloca and Check for return value of _malloc_crt
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*
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*******************************************************************************/
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#ifndef _POSIX_
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#ifndef _UNICODE
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#define _UNICODE
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#endif
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#include <cruntime.h>
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#include <internal.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <dbgint.h>
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#include <errno.h>
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#include <malloc.h>
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/***
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*double wtof(ptr) - convert wide char string to floating point number
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*
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*Purpose:
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* atof recognizes an optional string of whitespace, then
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* an optional sign, then a string of digits optionally
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* containing a decimal point, then an optional e or E followed
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* by an optionally signed integer, and converts all this to
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* to a floating point number. The first unrecognized
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* character ends the string.
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*
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*Entry:
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* ptr - pointer to wide char string to convert
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*
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*Exit:
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* returns floating point value of wide character representation
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*
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*Exceptions:
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*
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*******************************************************************************/
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double __cdecl _wtof(
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const wchar_t *ptr
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)
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{
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char *cptr;
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int malloc_flag = 0;
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size_t len;
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double retval;
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while (iswspace(*ptr))
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ptr++;
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len = wcstombs(NULL, ptr, 0);
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__try{
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cptr = (char *)_alloca((len+1) * sizeof(wchar_t));
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}
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__except(1){ //EXCEPTION_EXECUTE_HANDLER
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_resetstkoflw();
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if ((cptr = (char *)_malloc_crt((len+1) * sizeof(wchar_t))) == NULL)
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{
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errno = ENOMEM;
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return 0.0;
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}
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malloc_flag = 1;
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}
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// UNDONE: check for errors
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// Add one to len so as to null terminate cptr.
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wcstombs(cptr, ptr, len+1);
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retval = atof(cptr);
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if (malloc_flag)
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_free_crt(cptr);
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return retval;
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}
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#endif
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