#include	"call.h"#define	CTRLA	001		/* eof designator for take */static int		 rem_read(int);static char		 rem_buf[MAXLINE];static char		*rem_ptr;static int		 rem_cnt = 0;/* * Copy a file from remote to local. */voidtake(int remfd){	int		n, linecnt;	char	c;	char	cmd[MAXLINE];	FILE	*fpout;	if (prompt_read("~[take] ", take_put_args) < 0) {		printf("usage: [take] <sourcefile> <destfile>\n\r");		return;	}	/*	 * Open local output file.	 */	if ((fpout = fopen(dst, "w")) == NULL) {		err_ret("can't open %s for writing", dst);		putc('\r', stderr);		fflush(stderr);		return;	}	/*	 * Send cat/echo command to remote host.	 */	sprintf(cmd, "cat %s; echo %c\r", src, CTRLA);	n = strlen(cmd);	if (write(remfd, cmd, n) != n)		err_sys("write error");	/*	 * Read echo of cat/echo command line from remote host	 */	rem_cnt = 0;		/* initialize rem_read() */	for ( ; ; ) {		if ((c = rem_read(remfd)) == 0)			return;		/* line has dropped */		if (c == '\n')			break;		/* end of echo line */	}	/*	 * Read file from remote host.	 */	linecnt = 0;	for ( ; ; ) {		if ((c = rem_read(remfd)) == 0)			break;			/* line has dropped */		if (c == CTRLA)			break;			/* all done */		if (c == '\r')			continue;		/* ignore returns */		if (c == '\n')		/* but newlines are written to file */			printf("\r%d", ++linecnt);		if (putc(c, fpout) == EOF)			break;			/* output error */	}	if (ferror(fpout) || fclose(fpout) == EOF) {		err_msg("output error to local file");		putc('\r', stderr);		fflush(stderr);	}	c = '\n';	write(remfd, &c, 1);}/* * Read from remote.  Read up to MAXLINE, but parcel out one * character at a time. */intrem_read(int remfd){	if (rem_cnt <= 0) {		if ((rem_cnt = read(remfd, rem_buf, MAXLINE)) < 0)			err_sys("read error");		else if (rem_cnt == 0)			return(0);		rem_ptr = rem_buf;	}	rem_cnt--;	return(*rem_ptr++ & 0177);}