source: MondoRescue/branches/stable/mindi-busybox/networking/wget.c@ 1842

/* vi: set sw=4 ts=4: */
/*
 * wget - retrieve a file using HTTP or FTP
 *
 * Chip Rosenthal Covad Communications <chip@laserlink.net>
 *
 */

/* We want libc to give us xxx64 functions also */
/* http://www.unix.org/version2/whatsnew/lfs20mar.html */
//#define _LARGEFILE64_SOURCE 1

#include <getopt.h> /* for struct option */
#include "libbb.h"

struct host_info {
    // May be used if we ever will want to free() all xstrdup()s...
    /* char *allocated; */
    char *host;
    int port;
    char *path;
    int is_ftp;
    char *user;
};

static void parse_url(char *url, struct host_info *h);
static FILE *open_socket(len_and_sockaddr *lsa);
static char *gethdr(char *buf, size_t bufsiz, FILE *fp, int *istrunc);
static int ftpcmd(const char *s1, const char *s2, FILE *fp, char *buf);

/* Globals (can be accessed from signal handlers */
static off_t content_len;        /* Content-length of the file */
static off_t beg_range;          /* Range at which continue begins */
#if ENABLE_FEATURE_WGET_STATUSBAR
static off_t transferred;        /* Number of bytes transferred so far */
#endif
static bool chunked;                     /* chunked transfer encoding */
#if ENABLE_FEATURE_WGET_STATUSBAR
static void progressmeter(int flag);
static const char *curfile;             /* Name of current file being transferred */
enum {
    STALLTIME = 5                   /* Seconds when xfer considered "stalled" */
};
#else
static ALWAYS_INLINE void progressmeter(int flag) {}
#endif

/* Read NMEMB bytes into PTR from STREAM.  Returns the number of bytes read,
 * and a short count if an eof or non-interrupt error is encountered.  */
static size_t safe_fread(void *ptr, size_t nmemb, FILE *stream)
{
    size_t ret;
    char *p = (char*)ptr;

    do {
        clearerr(stream);
        ret = fread(p, 1, nmemb, stream);
        p += ret;
        nmemb -= ret;
    } while (nmemb && ferror(stream) && errno == EINTR);

    return p - (char*)ptr;
}

/* Read a line or SIZE-1 bytes into S, whichever is less, from STREAM.
 * Returns S, or NULL if an eof or non-interrupt error is encountered.  */
static char *safe_fgets(char *s, int size, FILE *stream)
{
    char *ret;

    do {
        clearerr(stream);
        ret = fgets(s, size, stream);
    } while (ret == NULL && ferror(stream) && errno == EINTR);

    return ret;
}

#if ENABLE_FEATURE_WGET_AUTHENTICATION
/* Base64-encode character string. buf is assumed to be char buf[512]. */
static char *base64enc_512(char buf[512], const char *str)
{
    unsigned len = strlen(str);
    if (len > 512/4*3 - 10) /* paranoia */
        len = 512/4*3 - 10;
    bb_uuencode(buf, str, len, bb_uuenc_tbl_base64);
    return buf;
}
#endif

int wget_main(int argc, char **argv);
int wget_main(int argc, char **argv)
{
    char buf[512];
    struct host_info server, target;
    len_and_sockaddr *lsa;
    int n, status;
    int port;
    int try = 5;
    unsigned opt;
    char *str;
    char *proxy = 0;
    char *dir_prefix = NULL;
#if ENABLE_FEATURE_WGET_LONG_OPTIONS
    char *extra_headers = NULL;
    llist_t *headers_llist = NULL;
#endif

    FILE *sfp = NULL;               /* socket to web/ftp server         */
    FILE *dfp = NULL;               /* socket to ftp server (data)      */
    char *fname_out = NULL;         /* where to direct output (-O)      */
    bool got_clen = 0;              /* got content-length: from server  */
    int output_fd = -1;
    bool use_proxy = 1;             /* Use proxies if env vars are set  */
    const char *proxy_flag = "on";  /* Use proxies if env vars are set  */
    const char *user_agent = "Wget";/* "User-Agent" header field        */
    static const char keywords[] ALIGN1 =
        "content-length\0""transfer-encoding\0""chunked\0""location\0";
    enum {
        KEY_content_length = 1, KEY_transfer_encoding, KEY_chunked, KEY_location
    };
    enum {
        WGET_OPT_CONTINUE   = 0x1,
        WGET_OPT_SPIDER     = 0x2,
        WGET_OPT_QUIET      = 0x4,
        WGET_OPT_OUTNAME    = 0x8,
        WGET_OPT_PREFIX     = 0x10,
        WGET_OPT_PROXY      = 0x20,
        WGET_OPT_USER_AGENT = 0x40,
        WGET_OPT_PASSIVE    = 0x80,
        WGET_OPT_HEADER     = 0x100,
    };
#if ENABLE_FEATURE_WGET_LONG_OPTIONS
    static const char wget_longopts[] ALIGN1 =
        /* name, has_arg, val */
        "continue\0"         No_argument       "c"
        "spider\0"           No_argument       "s"
        "quiet\0"            No_argument       "q"
        "output-document\0"  Required_argument "O"
        "directory-prefix\0" Required_argument "P"
        "proxy\0"            Required_argument "Y"
        "user-agent\0"       Required_argument "U"
        "passive-ftp\0"      No_argument       "\xff"
        "header\0"           Required_argument "\xfe"
        ;
    applet_long_options = wget_longopts;
#endif
    /* server.allocated = target.allocated = NULL; */
    opt_complementary = "-1" USE_FEATURE_WGET_LONG_OPTIONS(":\xfe::");
    opt = getopt32(argv, "csqO:P:Y:U:",
                &fname_out, &dir_prefix,
                &proxy_flag, &user_agent
                USE_FEATURE_WGET_LONG_OPTIONS(, &headers_llist)
                );
    if (strcmp(proxy_flag, "off") == 0) {
        /* Use the proxy if necessary */
        use_proxy = 0;
    }
#if ENABLE_FEATURE_WGET_LONG_OPTIONS
    if (headers_llist) {
        int size = 1;
        char *cp;
        llist_t *ll = headers_llist;
        while (ll) {
            size += strlen(ll->data) + 2;
            ll = ll->link;
        }
        extra_headers = cp = xmalloc(size);
        while (headers_llist) {
            cp += sprintf(cp, "%s\r\n", headers_llist->data);
            headers_llist = headers_llist->link;
        }
    }
#endif

    parse_url(argv[optind], &target);
    server.host = target.host;
    server.port = target.port;

    /* Use the proxy if necessary */
    if (use_proxy) {
        proxy = getenv(target.is_ftp ? "ftp_proxy" : "http_proxy");
        if (proxy && *proxy) {
            parse_url(proxy, &server);
        } else {
            use_proxy = 0;
        }
    }

    /* Guess an output filename */
    if (!fname_out) {
        // Dirty hack. Needed because bb_get_last_path_component
        // will destroy trailing / by storing '\0' in last byte!
        if (!last_char_is(target.path, '/')) {
            fname_out = bb_get_last_path_component(target.path);
#if ENABLE_FEATURE_WGET_STATUSBAR
            curfile = fname_out;
#endif
        }
        if (!fname_out || !fname_out[0]) {
            /* bb_get_last_path_component writes
             * to last '/' only. We don't have one here... */
            fname_out = (char*)"index.html";
#if ENABLE_FEATURE_WGET_STATUSBAR
            curfile = fname_out;
#endif
        }
        if (dir_prefix != NULL)
            fname_out = concat_path_file(dir_prefix, fname_out);
#if ENABLE_FEATURE_WGET_STATUSBAR
    } else {
        curfile = bb_get_last_path_component(fname_out);
#endif
    }
    /* Impossible?
    if ((opt & WGET_OPT_CONTINUE) && !fname_out)
        bb_error_msg_and_die("cannot specify continue (-c) without a filename (-O)"); */

    /* Determine where to start transfer */
    if (LONE_DASH(fname_out)) {
        output_fd = 1;
        opt &= ~WGET_OPT_CONTINUE;
    }
    if (opt & WGET_OPT_CONTINUE) {
        output_fd = open(fname_out, O_WRONLY);
        if (output_fd >= 0) {
            beg_range = xlseek(output_fd, 0, SEEK_END);
        }
        /* File doesn't exist. We do not create file here yet.
           We are not sure it exists on remove side */
    }

    /* We want to do exactly _one_ DNS lookup, since some
     * sites (i.e. ftp.us.debian.org) use round-robin DNS
     * and we want to connect to only one IP... */
    lsa = xhost2sockaddr(server.host, server.port);
    if (!(opt & WGET_OPT_QUIET)) {
        fprintf(stderr, "Connecting to %s (%s)\n", server.host,
                xmalloc_sockaddr2dotted(&lsa->sa));
        /* We leak result of xmalloc_sockaddr2dotted */
    }

    if (use_proxy || !target.is_ftp) {
        /*
         *  HTTP session
         */
        do {
            got_clen = chunked = 0;

            if (!--try)
                bb_error_msg_and_die("too many redirections");

            /* Open socket to http server */
            if (sfp) fclose(sfp);
            sfp = open_socket(lsa);

            /* Send HTTP request.  */
            if (use_proxy) {
                fprintf(sfp, "GET %stp://%s/%s HTTP/1.1\r\n",
                    target.is_ftp ? "f" : "ht", target.host,
                    target.path);
            } else {
                fprintf(sfp, "GET /%s HTTP/1.1\r\n", target.path);
            }

            fprintf(sfp, "Host: %s\r\nUser-Agent: %s\r\n",
                target.host, user_agent);

#if ENABLE_FEATURE_WGET_AUTHENTICATION
            if (target.user) {
                fprintf(sfp, "Proxy-Authorization: Basic %s\r\n"+6,
                    base64enc_512(buf, target.user));
            }
            if (use_proxy && server.user) {
                fprintf(sfp, "Proxy-Authorization: Basic %s\r\n",
                    base64enc_512(buf, server.user));
            }
#endif

            if (beg_range)
                fprintf(sfp, "Range: bytes=%"OFF_FMT"d-\r\n", beg_range);
#if ENABLE_FEATURE_WGET_LONG_OPTIONS
            if (extra_headers)
                fputs(extra_headers, sfp);
#endif
            fprintf(sfp, "Connection: close\r\n\r\n");

            /*
            * Retrieve HTTP response line and check for "200" status code.
            */
 read_response:
            if (fgets(buf, sizeof(buf), sfp) == NULL)
                bb_error_msg_and_die("no response from server");

            str = buf;
            str = skip_non_whitespace(str);
            str = skip_whitespace(str);
            // FIXME: no error check
            // xatou wouldn't work: "200 OK"
            status = atoi(str);
            switch (status) {
            case 0:
            case 100:
                while (gethdr(buf, sizeof(buf), sfp, &n) != NULL)
                    /* eat all remaining headers */;
                goto read_response;
            case 200:
                break;
            case 300:   /* redirection */
            case 301:
            case 302:
            case 303:
                break;
            case 206:
                if (beg_range)
                    break;
                /*FALLTHRU*/
            default:
                /* Show first line only and kill any ESC tricks */
                buf[strcspn(buf, "\n\r\x1b")] = '\0';
                bb_error_msg_and_die("server returned error: %s", buf);
            }

            /*
             * Retrieve HTTP headers.
             */
            while ((str = gethdr(buf, sizeof(buf), sfp, &n)) != NULL) {
                /* gethdr did already convert the "FOO:" string to lowercase */
                smalluint key = index_in_strings(keywords, *&buf) + 1;
                if (key == KEY_content_length) {
                    content_len = BB_STRTOOFF(str, NULL, 10);
                    if (errno || content_len < 0) {
                        bb_error_msg_and_die("content-length %s is garbage", str);
                    }
                    got_clen = 1;
                    continue;
                }
                if (key == KEY_transfer_encoding) {
                    if (index_in_strings(keywords, str_tolower(str)) + 1 != KEY_chunked)
                        bb_error_msg_and_die("server wants to do %s transfer encoding", str);
                    chunked = got_clen = 1;
                }
                if (key == KEY_location) {
                    if (str[0] == '/')
                        /* free(target.allocated); */
                        target.path = /* target.allocated = */ xstrdup(str+1);
                    else {
                        parse_url(str, &target);
                        if (use_proxy == 0) {
                            server.host = target.host;
                            server.port = target.port;
                        }
                        free(lsa);
                        lsa = xhost2sockaddr(server.host, server.port);
                        break;
                    }
                }
            }
        } while (status >= 300);

        dfp = sfp;

    } else {

        /*
         *  FTP session
         */
        if (!target.user)
            target.user = xstrdup("anonymous:busybox@");

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

        /*
         * Splitting username:password pair,
         * trying to log in
         */
        str = strchr(target.user, ':');
        if (str)
            *(str++) = '\0';
        switch (ftpcmd("USER ", target.user, sfp, buf)) {
        case 230:
            break;
        case 331:
            if (ftpcmd("PASS ", str, sfp, buf) == 230)
                break;
            /* FALLTHRU (failed login) */
        default:
            bb_error_msg_and_die("ftp login: %s", buf+4);
        }

        ftpcmd("TYPE I", NULL, sfp, buf);

        /*
         * Querying file size
         */
        if (ftpcmd("SIZE ", target.path, sfp, buf) == 213) {
            content_len = BB_STRTOOFF(buf+4, NULL, 10);
            if (errno || content_len < 0) {
                bb_error_msg_and_die("SIZE value is garbage");
            }
            got_clen = 1;
        }

        /*
         * Entering passive mode
         */
        if (ftpcmd("PASV", NULL, sfp, buf) != 227) {
 pasv_error:
            bb_error_msg_and_die("bad response to %s: %s", "PASV", buf);
        }
        // Response is "227 garbageN1,N2,N3,N4,P1,P2[)garbage]
        // Server's IP is N1.N2.N3.N4 (we ignore it)
        // Server's port for data connection is P1*256+P2
        str = strrchr(buf, ')');
        if (str) str[0] = '\0';
        str = strrchr(buf, ',');
        if (!str) goto pasv_error;
        port = xatou_range(str+1, 0, 255);
        *str = '\0';
        str = strrchr(buf, ',');
        if (!str) goto pasv_error;
        port += xatou_range(str+1, 0, 255) * 256;
        set_nport(lsa, htons(port));
        dfp = open_socket(lsa);

        if (beg_range) {
            sprintf(buf, "REST %"OFF_FMT"d", beg_range);
            if (ftpcmd(buf, NULL, sfp, buf) == 350)
                content_len -= beg_range;
        }

        if (ftpcmd("RETR ", target.path, sfp, buf) > 150)
            bb_error_msg_and_die("bad response to RETR: %s", buf);
    }
    if (opt & WGET_OPT_SPIDER) {
        if (ENABLE_FEATURE_CLEAN_UP)
            fclose(sfp);
        goto done;
    }

    /*
     * Retrieve file
     */
    if (chunked) {
        fgets(buf, sizeof(buf), dfp);
        content_len = STRTOOFF(buf, NULL, 16);
        /* FIXME: error check?? */
    }

    /* Do it before progressmeter (want to have nice error message) */
    if (output_fd < 0)
        output_fd = xopen(fname_out,
            O_WRONLY|O_CREAT|O_EXCL|O_TRUNC);

    if (!(opt & WGET_OPT_QUIET))
        progressmeter(-1);

    do {
        while (content_len > 0 || !got_clen) {
            unsigned rdsz = sizeof(buf);
            if (content_len < sizeof(buf) && (chunked || got_clen))
                rdsz = (unsigned)content_len;
            n = safe_fread(buf, rdsz, dfp);
            if (n <= 0)
                break;
            if (full_write(output_fd, buf, n) != n) {
                bb_perror_msg_and_die(bb_msg_write_error);
            }
#if ENABLE_FEATURE_WGET_STATUSBAR
            transferred += n;
#endif
            if (got_clen) {
                content_len -= n;
            }
        }

        if (chunked) {
            safe_fgets(buf, sizeof(buf), dfp); /* This is a newline */
            safe_fgets(buf, sizeof(buf), dfp);
            content_len = STRTOOFF(buf, NULL, 16);
            /* FIXME: error check? */
            if (content_len == 0) {
                chunked = 0; /* all done! */
            }
        }

        if (n == 0 && ferror(dfp)) {
            bb_perror_msg_and_die(bb_msg_read_error);
        }
    } while (chunked);

    if (!(opt & WGET_OPT_QUIET))
        progressmeter(1);

    if ((use_proxy == 0) && target.is_ftp) {
        fclose(dfp);
        if (ftpcmd(NULL, NULL, sfp, buf) != 226)
            bb_error_msg_and_die("ftp error: %s", buf+4);
        ftpcmd("QUIT", NULL, sfp, buf);
    }
done:
    exit(EXIT_SUCCESS);
}


static void parse_url(char *src_url, struct host_info *h)
{
    char *url, *p, *sp;

    /* h->allocated = */ url = xstrdup(src_url);

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

    // FYI:
    // "Real" wget 'http://busybox.net?var=a/b' sends this request:
    //   'GET /?var=a/b HTTP 1.0'
    //   and saves 'index.html?var=a%2Fb' (we save 'b')
    // wget 'http://busybox.net?login=john@doe':
    //   request: 'GET /?login=john@doe HTTP/1.0'
    //   saves: 'index.html?login=john@doe' (we save '?login=john@doe')
    // wget 'http://busybox.net#test/test':
    //   request: 'GET / HTTP/1.0'
    //   saves: 'index.html' (we save 'test')
    //
    // We also don't add unique .N suffix if file exists...
    sp = strchr(h->host, '/');
    p = strchr(h->host, '?'); if (!sp || (p && sp > p)) sp = p;
    p = strchr(h->host, '#'); if (!sp || (p && sp > p)) sp = p;
    if (!sp) {
        /* must be writable because of bb_get_last_path_component() */
        static char nullstr[] ALIGN1 = "";
        h->path = nullstr;
    } else if (*sp == '/') {
        *sp = '\0';
        h->path = sp + 1;
    } else { // '#' or '?'
        // http://busybox.net?login=john@doe is a valid URL
        // memmove converts to:
        // http:/busybox.nett?login=john@doe...
        memmove(h->host-1, h->host, sp - h->host);
        h->host--;
        sp[-1] = '\0';
        h->path = sp;
    }

    sp = strrchr(h->host, '@');
    h->user = NULL;
    if (sp != NULL) {
        h->user = h->host;
        *sp = '\0';
        h->host = sp + 1;
    }

    sp = h->host;
}


static FILE *open_socket(len_and_sockaddr *lsa)
{
    FILE *fp;

    /* glibc 2.4 seems to try seeking on it - ??! */
    /* hopefully it understands what ESPIPE means... */
    fp = fdopen(xconnect_stream(lsa), "r+");
    if (fp == NULL)
        bb_perror_msg_and_die("fdopen");

    return fp;
}


static 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 != ':')
        bb_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(const char *s1, const char *s2, FILE *fp, char *buf)
{
    int result;
    if (s1) {
        if (!s2) s2 = "";
        fprintf(fp, "%s%s\r\n", s1, s2);
        fflush(fp);
    }

    do {
        char *buf_ptr;

        if (fgets(buf, 510, fp) == NULL) {
            bb_perror_msg_and_die("error getting response");
        }
        buf_ptr = strstr(buf, "\r\n");
        if (buf_ptr) {
            *buf_ptr = '\0';
        }
    } while (!isdigit(buf[0]) || buf[3] != ' ');

    buf[3] = '\0';
    result = xatoi_u(buf);
    buf[3] = ' ';
    return result;
}

#if ENABLE_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)
{
    int width;
    get_terminal_width_height(0, &width, NULL);
    return width;
}

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

    progressmeter(0);
    errno = save_errno;
}

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

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

static void
progressmeter(int flag)
{
    static unsigned lastupdate_sec;
    static unsigned start_sec;
    static off_t lastsize, totalsize;

    off_t abbrevsize;
    unsigned since_last_update, elapsed;
    unsigned ratio;
    int barlength, i;

    if (flag == -1) { /* first call to progressmeter */
        start_sec = monotonic_sec();
        lastupdate_sec = start_sec;
        lastsize = 0;
        totalsize = content_len + beg_range; /* as content_len changes.. */
    }

    ratio = 100;
    if (totalsize != 0 && !chunked) {
        /* long long helps to have it working even if !LFS */
        ratio = (unsigned) (100ULL * (transferred+beg_range) / totalsize);
        if (ratio > 100) ratio = 100;
    }

    fprintf(stderr, "\r%-20.20s%4d%% ", curfile, ratio);

    barlength = getttywidth() - 49;
    if (barlength > 0) {
        /* god bless gcc for variable arrays :) */
        i = barlength * ratio / 100;
        {
            char buf[i+1];
            memset(buf, '*', i);
            buf[i] = '\0';
            fprintf(stderr, "|%s%*s|", buf, barlength - i, "");
        }
    }
    i = 0;
    abbrevsize = transferred + beg_range;
    while (abbrevsize >= 100000) {
        i++;
        abbrevsize >>= 10;
    }
    /* see http://en.wikipedia.org/wiki/Tera */
    fprintf(stderr, "%6d%c ", (int)abbrevsize, " kMGTPEZY"[i]);

// Nuts! Ain't it easier to update progress meter ONLY when we transferred++?
// FIXME: get rid of alarmtimer + updateprogressmeter mess

    elapsed = monotonic_sec();
    since_last_update = elapsed - lastupdate_sec;
    if (transferred > lastsize) {
        lastupdate_sec = elapsed;
        lastsize = transferred;
        if (since_last_update >= STALLTIME) {
            /* We "cut off" these seconds from elapsed time
             * by adjusting start time */
            start_sec += since_last_update;
        }
        since_last_update = 0; /* we are un-stalled now */
    }
    elapsed -= start_sec; /* now it's "elapsed since start" */

    if (since_last_update >= STALLTIME) {
        fprintf(stderr, " - stalled -");
    } else {
        off_t to_download = totalsize - beg_range;
        if (transferred <= 0 || (int)elapsed <= 0 || transferred > to_download || chunked) {
            fprintf(stderr, "--:--:-- ETA");
        } else {
            /* to_download / (transferred/elapsed) - elapsed: */
            int eta = (int) ((unsigned long long)to_download*elapsed/transferred - elapsed);
            /* (long long helps to have working ETA even if !LFS) */
            i = eta % 3600;
            fprintf(stderr, "%02d:%02d:%02d ETA", eta / 3600, i / 60, i % 60);
        }
    }

    if (flag == -1) { /* first call to progressmeter */
        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) { /* last call to progressmeter */
        alarmtimer(0);
        transferred = 0;
        putc('\n', stderr);
    }
}
#endif /* FEATURE_WGET_STATUSBAR */

/* Original copyright notice which applies to the CONFIG_FEATURE_WGET_STATUSBAR stuff,
 * much of which was blatantly 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.
 *
 */