fgets.c

来自「Algorithms for Image Processing and Comp」· C语言 代码 · 共 33 行

/* This is file FGETS.C */
/* This file may have been modified by DJ Delorie (Jan 1991).  If so,
** these modifications are Coyright (C) 1993 DJ Delorie, 24 Kirsten Ave,
** Rochester NH, 03867-2954, USA.
*/

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)fgets.c	5.2 (Berkeley) 3/9/86";
#endif LIBC_SCCS and not lint

#include	<stdio.h>

char *
fgets(s, n, iop)
char *s;
int n;
register FILE *iop;
{
	register c=0;
	register char *cs;

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