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Tricks of the Windows Gam…ming Gurus (2nd Edition)
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Disc2.iso
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vc98
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crt
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src
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fgets.c
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C/C++ Source or Header
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1998-06-17
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97 lines
/***
*fgets.c - get string from a file
*
* Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* defines fgets() - read a string from a file
*
*******************************************************************************/
#include <cruntime.h>
#include <stdio.h>
#include <dbgint.h>
#include <file2.h>
#include <internal.h>
#include <mtdll.h>
#include <tchar.h>
/***
*char *fgets(string, count, stream) - input string from a stream
*
*Purpose:
* get a string, up to count-1 chars or '\n', whichever comes first,
* append '\0' and put the whole thing into string. the '\n' IS included
* in the string. if count<=1 no input is requested. if EOF is found
* immediately, return NULL. if EOF found after chars read, let EOF
* finish the string as '\n' would.
*
*Entry:
* char *string - pointer to place to store string
* int count - max characters to place at string (include \0)
* FILE *stream - stream to read from
*
*Exit:
* returns string with text read from file in it.
* if count <= 0 return NULL
* if count == 1 put null string in string
* returns NULL if error or end-of-file found immediately
*
*Exceptions:
*
*******************************************************************************/
#ifdef _UNICODE
wchar_t * __cdecl fgetws (
#else /* _UNICODE */
char * __cdecl fgets (
#endif /* _UNICODE */
_TSCHAR *string,
int count,
FILE *str
)
{
REG1 FILE *stream;
REG2 _TSCHAR *pointer = string;
_TSCHAR *retval = string;
int ch;
_ASSERTE(string != NULL);
_ASSERTE(str != NULL);
if (count <= 0)
return(NULL);
/* Init stream pointer */
stream = str;
_lock_str(stream);
while (--count)
{
#ifdef _UNICODE
if ((ch = _getwc_lk(stream)) == WEOF)
#else /* _UNICODE */
if ((ch = _getc_lk(stream)) == EOF)
#endif /* _UNICODE */
{
if (pointer == string) {
retval=NULL;
goto done;
}
break;
}
if ((*pointer++ = (_TSCHAR)ch) == _T('\n'))
break;
}
*pointer = _T('\0');
/* Common return */
done:
_unlock_str(stream);
return(retval);
}