fgets.c

来自「TCP-IP红宝书源代码」· C语言 代码 · 共 28 行

/* fgets.c - fgets */

#define NULL    0

/*------------------------------------------------------------------------
 *  fgets  --  read a newline-terminated string from device (file) dev
 *------------------------------------------------------------------------
 */
char *fgets(dev, s, n)
        int      dev;
        char    *s;
        int      n;
{
	register c;
	register char *cs;

	cs = s;
        while (--n>0 && (c = getc(dev))>=0) {
		*cs++ = c;
		if (c=='\n')
			break;
	}
	if (c<0 && cs==s)
		return(NULL);
	*cs++ = '\0';
	return(s);
}