opendata.c

来自「unix环境高级编程的源代码」· C语言 代码 · 共 19 行

#include    <stdio.h>

#define    DATAFILE    "datafile"

FILE *
open_data(void)
{
    FILE    *fp;
    char    databuf[BUFSIZ];  /* setvbuf makes this the stdio buffer */

    if ( (fp = fopen(DATAFILE, "r")) == NULL)
        return(NULL);

    if (setvbuf(fp, databuf, BUFSIZ, _IOLBF) != 0)
        return(NULL);

    return(fp);        /* error */
}