wget.c

这是一个SIGMA方案的PMP播放器的UCLINUX程序,可播放DVD,VCD,CD MP3...有很好的参考价值.

		if (ftpcmd(NULL, NULL, sfp, buf) != 220)
			close_delete_and_die("%s", buf+4);

		/* 
		 * Splitting username:password pair,
		 * trying to log in
		 */
		s = strchr(target.user, ':');
		if (s)
			*(s++) = '\0';
		switch(ftpcmd("USER ", target.user, sfp, buf)) {
			case 230:
				break;
			case 331:
				if (ftpcmd("PASS ", s, sfp, buf) == 230)
					break;
				/* FALLTHRU (failed login) */
			default:
				close_delete_and_die("ftp login: %s", buf+4);
		}
		
		ftpcmd("CDUP", NULL, sfp, buf);
		ftpcmd("TYPE I", NULL, sfp, buf);
		
		/*
		 * Querying file size
		 */
		if (ftpcmd("SIZE /", target.path, sfp, buf) == 213) {
			filesize = atol(buf+4);
			got_clen = 1;
		}
		
		/*
		 * Entering passive mode
		 */
		if (ftpcmd("PASV", NULL, sfp, buf) !=  227)
			close_delete_and_die("PASV: %s", buf+4);
		s = strrchr(buf, ',');
		*s = 0;
		port = atoi(s+1);
		s = strrchr(buf, ',');
		port += atoi(s+1) * 256;
		dfp = open_socket(server.host, port);

		if (do_continue) {
			sprintf(buf, "REST %ld", beg_range);
			if (ftpcmd(buf, NULL, sfp, buf) != 350) {
				if (output != stdout)
					output = freopen(fname_out, "w", output);
				do_continue = 0;
			} else
				filesize -= beg_range;
		}
		
		if (ftpcmd("RETR /", target.path, sfp, buf) > 150)
			close_delete_and_die("RETR: %s", buf+4);

	}


	/*
	 * Retrieve file
	 */
	if (chunked) {
		fgets(buf, sizeof(buf), dfp);
		filesize = strtol(buf, (char **) NULL, 16);
	}
#ifdef CONFIG_FEATURE_WGET_STATUSBAR
	if (quiet_flag==FALSE)
		progressmeter(-1);
#endif
	do {
		while ((filesize > 0 || !got_clen) && (n = safe_fread(buf, 1, chunked ? (filesize > sizeof(buf) ? sizeof(buf) : filesize) : sizeof(buf), dfp)) > 0) {
			if (safe_fwrite(buf, 1, n, output) != n)
				perror_msg_and_die("write error");
#ifdef CONFIG_FEATURE_WGET_STATUSBAR
		statbytes+=n;
#endif
		if (got_clen)
			filesize -= n;
	}

		if (chunked) {
			safe_fgets(buf, sizeof(buf), dfp); /* This is a newline */
			safe_fgets(buf, sizeof(buf), dfp);
			filesize = strtol(buf, (char **) NULL, 16);
			if (filesize==0) chunked = 0; /* all done! */
		}

	if (n == 0 && ferror(dfp))
		perror_msg_and_die("network read error");
	} while (chunked);
#ifdef CONFIG_FEATURE_WGET_STATUSBAR
	if (quiet_flag==FALSE)
		progressmeter(1);
#endif
	if (!proxy && target.is_ftp) {
		fclose(dfp);
		if (ftpcmd(NULL, NULL, sfp, buf) != 226)
			error_msg_and_die("ftp error: %s", buf+4);
		ftpcmd("QUIT", NULL, sfp, buf);
	}
	exit(EXIT_SUCCESS);
}


void parse_url(char *url, struct host_info *h)
{
	char *cp, *sp, *up;

	if (strncmp(url, "http://", 7) == 0) {
		h->port = 80;
		h->host = url + 7;
		h->is_ftp = 0;
	} else if (strncmp(url, "ftp://", 6) == 0) {
		h->port = 21;
		h->host = url + 6;
		h->is_ftp = 1;
	} else
		error_msg_and_die("not an http or ftp url: %s", url);

	sp = strchr(h->host, '/');
	if (sp != NULL) {
		*sp++ = '\0';
		h->path = sp;
	} else
		h->path = xstrdup("");

	up = strrchr(h->host, '@');
	if (up != NULL) {
		h->user = h->host;
		*up++ = '\0';
		h->host = up;
	} else
		h->user = NULL;

	cp = strchr(h->host, ':');
	if (cp != NULL) {
		*cp++ = '\0';
		h->port = atoi(cp);
	}

}


FILE *open_socket(char *host, int port)
{
	int fd;
	FILE *fp;
	char port_str[10];

	snprintf(port_str, sizeof(port_str), "%d", port);
	fd=xconnect(host, port_str);

	/*
	 * Get the server onto a stdio stream.
	 */
	if ((fp = fdopen(fd, "r+")) == NULL)
		perror_msg_and_die("fdopen()");

	return fp;
}


char *gethdr(char *buf, size_t bufsiz, FILE *fp, int *istrunc)
{
	char *s, *hdrval;
	int c;

	*istrunc = 0;

	/* retrieve header line */
	if (fgets(buf, bufsiz, fp) == NULL)
		return NULL;

	/* see if we are at the end of the headers */
	for (s = buf ; *s == '\r' ; ++s)
		;
	if (s[0] == '\n')
		return NULL;

	/* convert the header name to lower case */
	for (s = buf ; isalnum(*s) || *s == '-' ; ++s)
		*s = tolower(*s);

	/* verify we are at the end of the header name */
	if (*s != ':')
		error_msg_and_die("bad header line: %s", buf);

	/* locate the start of the header value */
	for (*s++ = '\0' ; *s == ' ' || *s == '\t' ; ++s)
		;
	hdrval = s;

	/* locate the end of header */
	while (*s != '\0' && *s != '\r' && *s != '\n')
		++s;

	/* end of header found */
	if (*s != '\0') {
		*s = '\0';
		return hdrval;
	}

	/* Rats!  The buffer isn't big enough to hold the entire header value. */
	while (c = getc(fp), c != EOF && c != '\n')
		;
	*istrunc = 1;
	return hdrval;
}

static int ftpcmd(char *s1, char *s2, FILE *fp, char *buf)
{
	char *p;
	
	if (s1) {
		if (!s2) s2="";
		fprintf(fp, "%s%s\n", s1, s2);
		fflush(fp);
	}
	
	do {
		p = fgets(buf, 510, fp);
		if (!p)
			perror_msg_and_die("fgets()");
	} while (! isdigit(buf[0]) || buf[3] != ' ');
	
	return atoi(buf);
}

#ifdef CONFIG_FEATURE_WGET_STATUSBAR
/* Stuff below is from BSD rcp util.c, as added to openshh. 
 * Original copyright notice is retained at the end of this file.
 * 
 */ 


static int
getttywidth(void)
{
	struct winsize winsize;

	if (ioctl(fileno(stdout), TIOCGWINSZ, &winsize) != -1)
		return (winsize.ws_col ? winsize.ws_col : 80);
	else
		return (80);
}

static void
updateprogressmeter(int ignore)
{
	int save_errno = errno;

	progressmeter(0);
	errno = save_errno;
}

static void
alarmtimer(int wait)
{
	struct itimerval itv;

	itv.it_value.tv_sec = wait;
	itv.it_value.tv_usec = 0;
	itv.it_interval = itv.it_value;
	setitimer(ITIMER_REAL, &itv, NULL);
}


static void
progressmeter(int flag)
{
	static const char prefixes[] = " KMGTP";
	static struct timeval lastupdate;
	static off_t lastsize, totalsize;
	struct timeval now, td, wait;
	off_t cursize, abbrevsize;
	double elapsed;
	int ratio, barlength, i, remaining;
	char buf[256];

	if (flag == -1) {
		(void) gettimeofday(&start, (struct timezone *) 0);
		lastupdate = start;
		lastsize = 0;
		totalsize = filesize; /* as filesize changes.. */
	}

	(void) gettimeofday(&now, (struct timezone *) 0);
	cursize = statbytes;
	if (totalsize != 0 && !chunked) {
		ratio = 100.0 * cursize / totalsize;
		ratio = MAX(ratio, 0);
		ratio = MIN(ratio, 100);
	} else
		ratio = 100;

	snprintf(buf, sizeof(buf), "\r%-20.20s %3d%% ", curfile, ratio);

	barlength = getttywidth() - 51;
	if (barlength > 0) {
		i = barlength * ratio / 100;
		snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
			 "|%.*s%*s|", i,
			 "*****************************************************************************"
			 "*****************************************************************************",
			 barlength - i, "");
	}
	i = 0;
	abbrevsize = cursize;
	while (abbrevsize >= 100000 && i < sizeof(prefixes)) {
		i++;
		abbrevsize >>= 10;
	}
	snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), " %5d %c%c ",
	     (int) abbrevsize, prefixes[i], prefixes[i] == ' ' ? ' ' :
		 'B');

	timersub(&now, &lastupdate, &wait);
	if (cursize > lastsize) {
		lastupdate = now;
		lastsize = cursize;
		if (wait.tv_sec >= STALLTIME) {
			start.tv_sec += wait.tv_sec;
			start.tv_usec += wait.tv_usec;
		}
		wait.tv_sec = 0;
	}
	timersub(&now, &start, &td);
	elapsed = td.tv_sec + (td.tv_usec / 1000000.0);

	if (wait.tv_sec >= STALLTIME) {
		snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
			 " - stalled -");
	} else if (statbytes <= 0 || elapsed <= 0.0 || cursize > totalsize || chunked) {
		snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
			 "   --:-- ETA");
	} else {
		remaining = (int) (totalsize / (statbytes / elapsed) - elapsed);
		i = remaining / 3600;
		if (i)
			snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
				 "%2d:", i);
		else
			snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
				 "   ");
		i = remaining % 3600;
		snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
			 "%02d:%02d ETA", i / 60, i % 60);
	}
	write(fileno(stderr), buf, strlen(buf));

	if (flag == -1) {
		struct sigaction sa;
		sa.sa_handler = updateprogressmeter;
		sigemptyset(&sa.sa_mask);
		sa.sa_flags = SA_RESTART;
		sigaction(SIGALRM, &sa, NULL);
		alarmtimer(1);
	} else if (flag == 1) {
		alarmtimer(0);
		statbytes = 0;
		putc('\n', stderr);
	}
}
#endif

/* Original copyright notice which applies to the CONFIG_FEATURE_WGET_STATUSBAR stuff,
 * much of which was blatently stolen from openssh.  */
 
/*-
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change 
 *		ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change> 
 *
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	$Id: wget.c,v 1.50 2002/07/03 11:51:44 andersen Exp $
 */



/*
Local Variables:
c-file-style: "linux"
c-basic-offset: 4
tab-width: 4
End:
*/