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/***
*gets.c - read a line from stdin
*
* Copyright (c) 1985-1991, Microsoft Corporation. All rights reserved.
*
*Purpose:
* defines gets() - read a line from stdin into buffer
*
*Revision History:
* 09-02-83 RN initial version
* 11-06-87 JCR Multi-thread support
* 12-11-87 JCR Added "_LOAD_DS" to declaration
* 05-27-88 PHG Merged DLL and normal versions
* 02-15-90 GJF Fixed copyright, indents
* 03-19-90 GJF Replaced _LOAD_DS with _CALLTYPE1, added #include
* <cruntime.h> and removed #include <register.h>.
* 07-24-90 SBM Replaced <assertm.h> by <assert.h>
* 08-14-90 SBM Compiles cleanly with -W3
* 10-02-90 GJF New-style function declarator.
*
*******************************************************************************/
#include <cruntime.h>
#include <stdio.h>
#include <assert.h>
#include <file2.h>
#include <os2dll.h>
/***
*char *gets(string) - read a line from stdin
*
*Purpose:
* Gets a string from stdin terminated by '\n' or EOF; don't include '\n';
* append '\0'.
*
*Entry:
* char *string - place to store read string, assumes enough room.
*
*Exit:
* returns string, filled in with the line of input
* null string if \n found immediately
* NULL if EOF found immediately
*
*Exceptions:
*
*******************************************************************************/
char * _CALLTYPE1 gets (
REG3 char *string
)
{
REG2 int ch;
REG1 char *pointer = string;
char *retval = string;
#ifdef MTHREAD
int index;
#endif
assert(string != NULL);
#ifdef MTHREAD
index = _iob_index((FILE *)stdin);
#endif
_lock_str(index);
while ((ch = _getchar_lk()) != '\n')
{
if (ch == EOF)
{
if (pointer == string)
{
retval = NULL;
goto done;
}
break;
}
*pointer++ = (char)ch;
}
*pointer = '\0';
/* Common return */
done:
_unlock_str(index);
return(retval);
}
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