133 lines
3.8 KiB
C
133 lines
3.8 KiB
C
/***
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*fgets.c - get string from a file
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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 fgets() - read a string from a file
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*
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*Revision History:
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* 09-02-83 RN initial version
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* 04-16-87 JCR changed count from an unsigned int to an int (ANSI)
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* and modified comparisons accordingly
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* 11-06-87 JCR Multi-thread support
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* 12-11-87 JCR Added "_LOAD_DS" to declaration
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* 05-31-88 PHG Merged DLL and normal versions
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* 06-14-88 JCR Use near pointer to reference _iob[] entries
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* 08-24-88 GJF Don't use FP_OFF() macro for the 386
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* 08-28-89 JCR Removed _NEAR_ for 386
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* 02-15-90 GJF Fixed copyright and indents
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* 03-19-90 GJF Replaced _LOAD_DS with _CALLTYPE1, added #include
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* <cruntime.h> and added #include <register.h>. Also,
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* removed some leftover 16-bit support.
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* 07-24-90 SBM Replaced <assertm.h> by <assert.h>
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* 08-14-90 SBM Compiles cleanly with -W3
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* 10-02-90 GJF New-style function declarator.
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 10-01-93 CFW Enable for fgetws().
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* 12-07-93 CFW Change _TCHAR to _TSCHAR.
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* 09-06-94 CFW Replace MTHREAD with _MT.
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* 02-06-94 CFW assert -> _ASSERTE.
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* 02-22-95 GJF Replaced WPRFLAG with _UNICODE.
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* 03-07-95 GJF _[un]lock_str macros now take FILE * arg.
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* 02-27-98 GJF Exception-safe locking.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <stdio.h>
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#include <dbgint.h>
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#include <file2.h>
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#include <internal.h>
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#include <mtdll.h>
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#include <tchar.h>
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/***
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*char *fgets(string, count, stream) - input string from a stream
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*
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*Purpose:
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* get a string, up to count-1 chars or '\n', whichever comes first,
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* append '\0' and put the whole thing into string. the '\n' IS included
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* in the string. if count<=1 no input is requested. if EOF is found
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* immediately, return NULL. if EOF found after chars read, let EOF
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* finish the string as '\n' would.
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*
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*Entry:
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* char *string - pointer to place to store string
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* int count - max characters to place at string (include \0)
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* FILE *stream - stream to read from
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*
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*Exit:
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* returns string with text read from file in it.
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* if count <= 0 return NULL
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* if count == 1 put null string in string
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* returns NULL if error or end-of-file found immediately
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*
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*Exceptions:
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*
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*******************************************************************************/
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#ifdef _UNICODE
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wchar_t * __cdecl fgetws (
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#else
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char * __cdecl fgets (
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#endif
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_TSCHAR *string,
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int count,
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FILE *str
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)
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{
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REG1 FILE *stream;
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REG2 _TSCHAR *pointer = string;
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_TSCHAR *retval = string;
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int ch;
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_ASSERTE(string != NULL);
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_ASSERTE(str != NULL);
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if (count <= 0)
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return(NULL);
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/* Init stream pointer */
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stream = str;
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#ifdef _MT
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_lock_str(stream);
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__try {
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#endif
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while (--count)
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{
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#ifdef _UNICODE
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if ((ch = _getwc_lk(stream)) == WEOF)
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#else
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if ((ch = _getc_lk(stream)) == EOF)
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#endif
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{
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if (pointer == string) {
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retval=NULL;
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goto done;
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}
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break;
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}
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if ((*pointer++ = (_TSCHAR)ch) == _T('\n'))
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break;
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}
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*pointer = _T('\0');
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/* Common return */
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done:
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#ifdef _MT
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; }
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__finally {
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_unlock_str(stream);
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}
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#endif
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return(retval);
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}
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