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─────Run-Time Library───────────────────────────────────────────────────────
 
/* COMMIT.C illustrates low-level file I/O functions including:
 *
 *     _close    _commit    memset    _open    _write
 *
 * This is example code; to keep the code simple and readable
 * return values are not checked.
 */
 
 
#include <io.h>
#include <stdio.h>
#include <fcntl.h>
 
#define MAXBUF 32
 
int log_receivable( int );
 
int main( void )
{
    int fhandle;
    fhandle = _open( "TRANSACT.LOG", _O_APPEND | _O_CREAT |
                                     _O_BINARY | _O_RDWR );
    log_receivable( fhandle );
    _close( fhandle );
}
 
int log_receivable( int fhandle )
{
/* The log_receivable function prompts for a name and a monetary amount
 * and places both values into a buffer (buf). The _write function
 * writes the values to the operating system and the _commit function
 * ensures that they are written to a disk file.
 */
 
    int i;
    char  buf[MAXBUF];
 
    memset( buf, '\0', MAXBUF );
    /* Begin Transaction. */
    printf( "Enter name: " );
    gets( buf );
    for( i = 1; buf[i] != '\0'; i++ );
    /* Write the value as a '\0' terminated string. */
    _write( fhandle, buf, i+1 );
    printf( "\n" );
 
    memset( buf, '\0', MAXBUF );
    printf( "Enter amount: $" );
    gets( buf );
    for( i = 1; buf[i] != '\0'; i++ );
    /* Write the value as a '\0' terminated string. */
    _write( fhandle, buf, i+1 );
    printf( "\n" );
 
    return _commit( fhandle );
    /* The _commit function ensures that two important pieces of data are
     * safely written to disk. The return value of the _commit function
     * is returned to the calling function.
     */
}
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