X-Git-Url: http://sjero.net/git/?a=blobdiff_plain;f=src%2Fretr.c;h=c5c1532ba7188c7c39ef0dd6315e3fdf984a76e9;hb=0967c21094580317353f0742c4836c5bbea34059;hp=8f1f4394682993bd87e8cd539c0d604968318a0a;hpb=fb67dd6201639ce4d97d8d2d7c2e9e75ac69f5a4;p=wget diff --git a/src/retr.c b/src/retr.c index 8f1f4394..c5c1532b 100644 --- a/src/retr.c +++ b/src/retr.c @@ -53,200 +53,458 @@ so, delete this exception statement from your version. */ #include "host.h" #include "connect.h" #include "hash.h" - -#ifdef HAVE_SSL -# include "gen_sslfunc.h" /* for ssl_iread */ -#endif +#include "convert.h" +#include "ptimer.h" #ifndef errno extern int errno; #endif -/* See the comment in gethttp() why this is needed. */ -int global_download_count; +/* Total size of downloaded files. Used to enforce quota. */ +LARGE_INT total_downloaded_bytes; +/* If non-NULL, the stream to which output should be written. This + stream is initialized when `-O' is used. */ +FILE *output_stream; + +/* Whether output_document is a regular file we can manipulate, + i.e. not `-' or a device file. */ +int output_stream_regular; static struct { - long bytes; - double dltime; + wgint chunk_bytes; + double chunk_start; + double sleep_adjust; } limit_data; static void limit_bandwidth_reset (void) { - limit_data.bytes = 0; - limit_data.dltime = 0; + limit_data.chunk_bytes = 0; + limit_data.chunk_start = 0; } /* Limit the bandwidth by pausing the download for an amount of time. - BYTES is the number of bytes received from the network, DELTA is - how long it took to receive them, DLTIME the current download time, - TIMER the timer, and ADJUSTMENT the previous. */ + BYTES is the number of bytes received from the network, and TIMER + is the timer that started at the beginning of download. */ static void -limit_bandwidth (long bytes, double delta) +limit_bandwidth (wgint bytes, struct ptimer *timer) { + double delta_t = ptimer_read (timer) - limit_data.chunk_start; double expected; - limit_data.bytes += bytes; - limit_data.dltime += delta; + limit_data.chunk_bytes += bytes; - expected = 1000.0 * limit_data.bytes / opt.limit_rate; + /* Calculate the amount of time we expect downloading the chunk + should take. If in reality it took less time, sleep to + compensate for the difference. */ + expected = 1000.0 * limit_data.chunk_bytes / opt.limit_rate; - if (expected > limit_data.dltime) + if (expected > delta_t) { - double slp = expected - limit_data.dltime; + double slp = expected - delta_t + limit_data.sleep_adjust; + double t0, t1; if (slp < 200) { - DEBUGP (("deferring a %.2f ms sleep (%ld/%.2f).\n", - slp, limit_data.bytes, limit_data.dltime)); + DEBUGP (("deferring a %.2f ms sleep (%s/%.2f).\n", + slp, number_to_static_string (limit_data.chunk_bytes), + delta_t)); return; } - DEBUGP (("sleeping %.2f ms\n", slp)); - usleep ((unsigned long) (1000 * slp)); + DEBUGP (("\nsleeping %.2f ms for %s bytes, adjust %.2f ms\n", + slp, number_to_static_string (limit_data.chunk_bytes), + limit_data.sleep_adjust)); + + t0 = ptimer_read (timer); + xsleep (slp / 1000); + t1 = ptimer_measure (timer); + + /* Due to scheduling, we probably slept slightly longer (or + shorter) than desired. Calculate the difference between the + desired and the actual sleep, and adjust the next sleep by + that amount. */ + limit_data.sleep_adjust = slp - (t1 - t0); } - limit_data.bytes = 0; - limit_data.dltime = 0; + limit_data.chunk_bytes = 0; + limit_data.chunk_start = ptimer_read (timer); } -#define MIN(i, j) ((i) <= (j) ? (i) : (j)) +#ifndef MIN +# define MIN(i, j) ((i) <= (j) ? (i) : (j)) +#endif + +/* Write data in BUF to OUT. However, if *SKIP is non-zero, skip that + amount of data and decrease SKIP. Increment *TOTAL by the amount + of data written. */ + +static int +write_data (FILE *out, const char *buf, int bufsize, wgint *skip, + wgint *written) +{ + if (!out) + return 1; + if (*skip > bufsize) + { + *skip -= bufsize; + return 1; + } + if (*skip) + { + buf += *skip; + bufsize -= *skip; + *skip = 0; + if (bufsize == 0) + return 1; + } + + fwrite (buf, 1, bufsize, out); + *written += bufsize; -/* Reads the contents of file descriptor FD, until it is closed, or a - read error occurs. The data is read in 8K chunks, and stored to - stream fp, which should have been open for writing. If BUF is - non-NULL and its file descriptor is equal to FD, flush RBUF first. - This function will *not* use the rbuf_* functions! + /* Immediately flush the downloaded data. This should not hinder + performance: fast downloads will arrive in large 16K chunks + (which stdio would write out immediately anyway), and slow + downloads wouldn't be limited by disk speed. */ + fflush (out); + return !ferror (out); +} - The EXPECTED argument is passed to show_progress() unchanged, but - otherwise ignored. +/* Read the contents of file descriptor FD until it the connection + terminates or a read error occurs. The data is read in portions of + up to 16K and written to OUT as it arrives. If opt.verbose is set, + the progress is shown. - If opt.verbose is set, the progress is also shown. RESTVAL - represents a value from which to start downloading (which will be - shown accordingly). If RESTVAL is non-zero, the stream should have - been open for appending. + TOREAD is the amount of data expected to arrive, normally only used + by the progress gauge. - The function exits and returns codes of 0, -1 and -2 if the - connection was closed, there was a read error, or if it could not - write to the output stream, respectively. + STARTPOS is the position from which the download starts, used by + the progress gauge. If QTYREAD is non-NULL, the value it points to + is incremented by the amount of data read from the network. If + QTYWRITTEN is non-NULL, the value it points to is incremented by + the amount of data written to disk. The time it took to download + the data (in milliseconds) is stored to ELAPSED. + + The function exits and returns the amount of data read. In case of + error while reading data, -1 is returned. In case of error while + writing data, -2 is returned. */ - IMPORTANT: The function flushes the contents of the buffer in - rbuf_flush() before actually reading from fd. If you wish to read - from fd immediately, flush or discard the buffer. */ int -get_contents (int fd, FILE *fp, long *len, long restval, long expected, - struct rbuf *rbuf, int use_expected, double *elapsed) +fd_read_body (int fd, FILE *out, wgint toread, wgint startpos, + wgint *qtyread, wgint *qtywritten, double *elapsed, int flags) { - int res = 0; + int ret = 0; static char dlbuf[16384]; int dlbufsize = sizeof (dlbuf); + struct ptimer *timer = NULL; + double last_successful_read_tm = 0; + + /* The progress gauge, set according to the user preferences. */ void *progress = NULL; - struct wget_timer *timer = wtimer_allocate (); - double dltime = 0, last_dltime = 0; - *len = restval; + /* Non-zero if the progress gauge is interactive, i.e. if it can + continually update the display. When true, smaller timeout + values are used so that the gauge can update the display when + data arrives slowly. */ + int progress_interactive = 0; + + int exact = flags & rb_read_exactly; + wgint skip = 0; + + /* How much data we've read/written. */ + wgint sum_read = 0; + wgint sum_written = 0; + + if (flags & rb_skip_startpos) + skip = startpos; if (opt.verbose) - progress = progress_create (restval, expected); + { + /* If we're skipping STARTPOS bytes, pass 0 as the INITIAL + argument to progress_create because the indicator doesn't + (yet) know about "skipping" data. */ + progress = progress_create (skip ? 0 : startpos, startpos + toread); + progress_interactive = progress_interactive_p (progress); + } + + if (opt.limit_rate) + limit_bandwidth_reset (); + + /* A timer is needed for tracking progress, for throttling, and for + tracking elapsed time. If either of these are requested, start + the timer. */ + if (progress || opt.limit_rate || elapsed) + { + timer = ptimer_new (); + last_successful_read_tm = 0; + } - if (rbuf && RBUF_FD (rbuf) == fd) + /* Use a smaller buffer for low requested bandwidths. For example, + with --limit-rate=2k, it doesn't make sense to slurp in 16K of + data and then sleep for 8s. With buffer size equal to the limit, + we never have to sleep for more than one second. */ + if (opt.limit_rate && opt.limit_rate < dlbufsize) + dlbufsize = opt.limit_rate; + + /* Read from FD while there is data to read. Normally toread==0 + means that it is unknown how much data is to arrive. However, if + EXACT is set, then toread==0 means what it says: that no data + should be read. */ + while (!exact || (sum_read < toread)) { - int sz = 0; - while ((res = rbuf_flush (rbuf, dlbuf, sizeof (dlbuf))) != 0) + int rdsize = exact ? MIN (toread - sum_read, dlbufsize) : dlbufsize; + double tmout = opt.read_timeout; + if (progress_interactive) + { + /* For interactive progress gauges, always specify a ~1s + timeout, so that the gauge can be updated regularly even + when the data arrives very slowly or stalls. */ + tmout = 0.95; + if (opt.read_timeout) + { + double waittm; + waittm = (ptimer_read (timer) - last_successful_read_tm) / 1000; + if (waittm + tmout > opt.read_timeout) + { + /* Don't let total idle time exceed read timeout. */ + tmout = opt.read_timeout - waittm; + if (tmout < 0) + { + /* We've already exceeded the timeout. */ + ret = -1, errno = ETIMEDOUT; + break; + } + } + } + } + ret = fd_read (fd, dlbuf, rdsize, tmout); + + if (progress_interactive && ret < 0 && errno == ETIMEDOUT) + ret = 0; /* interactive timeout, handled above */ + else if (ret <= 0) + break; /* EOF or read error */ + + if (progress || opt.limit_rate) { - fwrite (dlbuf, 1, res, fp); - *len += res; - sz += res; + ptimer_measure (timer); + if (ret > 0) + last_successful_read_tm = ptimer_read (timer); } - if (sz) - fflush (fp); - if (ferror (fp)) + + if (ret > 0) { - res = -2; - goto out; + sum_read += ret; + if (!write_data (out, dlbuf, ret, &skip, &sum_written)) + { + ret = -2; + goto out_; + } } + + if (opt.limit_rate) + limit_bandwidth (ret, timer); + if (progress) - progress_update (progress, sz, 0); + progress_update (progress, ret, ptimer_read (timer)); +#ifdef WINDOWS + if (toread > 0 && !opt.quiet) + ws_percenttitle (100.0 * + (startpos + sum_read) / (startpos + toread)); +#endif } + if (ret < -1) + ret = -1; - if (opt.limit_rate) - limit_bandwidth_reset (); - wtimer_reset (timer); + out_: + if (progress) + progress_finish (progress, ptimer_read (timer)); - /* If we're limiting the download, set our buffer size to the - limit. */ - if (opt.limit_rate && opt.limit_rate < dlbufsize) - dlbufsize = opt.limit_rate; + if (elapsed) + *elapsed = ptimer_read (timer); + if (timer) + ptimer_destroy (timer); + + if (qtyread) + *qtyread += sum_read; + if (qtywritten) + *qtywritten += sum_written; + + return ret; +} + +/* Read a hunk of data from FD, up until a terminator. The terminator + is whatever the TERMINATOR function determines it to be; for + example, it can be a line of data, or the head of an HTTP response. + The function returns the data read allocated with malloc. + + In case of error, NULL is returned. In case of EOF and no data + read, NULL is returned and errno set to 0. In case of EOF with + data having been read, the data is returned, but it will + (obviously) not contain the terminator. + + The idea is to be able to read a line of input, or otherwise a hunk + of text, such as the head of an HTTP request, without crossing the + boundary, so that the next call to fd_read etc. reads the data + after the hunk. To achieve that, this function does the following: - /* Read from fd while there is available data. + 1. Peek at available data. - Normally, if expected is 0, it means that it is not known how - much data is expected. However, if use_expected is specified, - then expected being zero means exactly that. */ - while (!use_expected || (*len < expected)) + 2. Determine whether the peeked data, along with the previously + read data, includes the terminator. + + 2a. If yes, read the data until the end of the terminator, and + exit. + + 2b. If no, read the peeked data and goto 1. + + The function is careful to assume as little as possible about the + implementation of peeking. For example, every peek is followed by + a read. If the read returns a different amount of data, the + process is retried until all data arrives safely. + + SIZEHINT is the buffer size sufficient to hold all the data in the + typical case (it is used as the initial buffer size). MAXSIZE is + the maximum amount of memory this function is allowed to allocate, + or 0 if no upper limit is to be enforced. + + This function should be used as a building block for other + functions -- see fd_read_line as a simple example. */ + +char * +fd_read_hunk (int fd, hunk_terminator_t terminator, long sizehint, long maxsize) +{ + long bufsize = sizehint; + char *hunk = xmalloc (bufsize); + int tail = 0; /* tail position in HUNK */ + + assert (maxsize >= bufsize); + + while (1) { - int amount_to_read = (use_expected - ? MIN (expected - *len, dlbufsize) : dlbufsize); -#ifdef HAVE_SSL - if (rbuf->ssl!=NULL) - res = ssl_iread (rbuf->ssl, dlbuf, amount_to_read); - else -#endif /* HAVE_SSL */ - res = iread (fd, dlbuf, amount_to_read); + const char *end; + int pklen, rdlen, remain; - if (res > 0) + /* First, peek at the available data. */ + + pklen = fd_peek (fd, hunk + tail, bufsize - 1 - tail, -1.0); + if (pklen < 0) { - fwrite (dlbuf, 1, res, fp); - /* Always flush the contents of the network packet. This - should not be adverse to performance, as the network - packets typically won't be too tiny anyway. */ - fflush (fp); - if (ferror (fp)) + xfree (hunk); + return NULL; + } + end = terminator (hunk, tail, pklen); + if (end) + { + /* The data contains the terminator: we'll drain the data up + to the end of the terminator. */ + remain = end - (hunk + tail); + if (remain == 0) + { + /* No more data needs to be read. */ + hunk[tail] = '\0'; + return hunk; + } + if (bufsize - 1 < tail + remain) { - res = -2; - goto out; + bufsize = tail + remain + 1; + hunk = xrealloc (hunk, bufsize); } + } + else + /* No terminator: simply read the data we know is (or should + be) available. */ + remain = pklen; + + /* Now, read the data. Note that we make no assumptions about + how much data we'll get. (Some TCP stacks are notorious for + read returning less data than the previous MSG_PEEK.) */ + + rdlen = fd_read (fd, hunk + tail, remain, 0.0); + if (rdlen < 0) + { + xfree_null (hunk); + return NULL; + } + tail += rdlen; + hunk[tail] = '\0'; - /* If bandwidth is not limited, one call to wtimer_elapsed - is sufficient. */ - dltime = wtimer_elapsed (timer); - if (opt.limit_rate) + if (rdlen == 0) + { + if (tail == 0) { - limit_bandwidth (res, dltime - last_dltime); - dltime = wtimer_elapsed (timer); - last_dltime = dltime; + /* EOF without anything having been read */ + xfree (hunk); + errno = 0; + return NULL; } + else + /* EOF seen: return the data we've read. */ + return hunk; + } + if (end && rdlen == remain) + /* The terminator was seen and the remaining data drained -- + we got what we came for. */ + return hunk; - if (progress) - progress_update (progress, res, dltime); - *len += res; + /* Keep looping until all the data arrives. */ + + if (tail == bufsize - 1) + { + /* Double the buffer size, but refuse to allocate more than + MAXSIZE bytes. */ + if (maxsize && bufsize >= maxsize) + { + xfree (hunk); + errno = ENOMEM; + return NULL; + } + bufsize <<= 1; + if (maxsize && bufsize > maxsize) + bufsize = maxsize; + hunk = xrealloc (hunk, bufsize); } - else - break; } - if (res < -1) - res = -1; +} - out: - if (progress) - progress_finish (progress, dltime); - if (elapsed) - *elapsed = dltime; - wtimer_delete (timer); +static const char * +line_terminator (const char *hunk, int oldlen, int peeklen) +{ + const char *p = memchr (hunk + oldlen, '\n', peeklen); + if (p) + /* p+1 because we want the line to include '\n' */ + return p + 1; + return NULL; +} - return res; +/* The maximum size of the single line we agree to accept. This is + not meant to impose an arbitrary limit, but to protect the user + from Wget slurping up available memory upon encountering malicious + or buggy server output. Define it to 0 to remove the limit. */ +#define FD_READ_LINE_MAX 4096 + +/* Read one line from FD and return it. The line is allocated using + malloc, but is never larger than FD_READ_LINE_MAX. + + If an error occurs, or if no data can be read, NULL is returned. + In the former case errno indicates the error condition, and in the + latter case, errno is NULL. */ + +char * +fd_read_line (int fd) +{ + return fd_read_hunk (fd, line_terminator, 128, FD_READ_LINE_MAX); } /* Return a printed representation of the download rate, as appropriate for the speed. If PAD is non-zero, strings will be padded to the width of 7 characters (xxxx.xx). */ char * -retr_rate (long bytes, double msecs, int pad) +retr_rate (wgint bytes, double msecs, int pad) { static char res[20]; - static char *rate_names[] = {"B/s", "KB/s", "MB/s", "GB/s" }; + static const char *rate_names[] = {"B/s", "KB/s", "MB/s", "GB/s" }; int units = 0; double dlrate = calc_rate (bytes, msecs, &units); @@ -263,7 +521,7 @@ retr_rate (long bytes, double msecs, int pad) UNITS is zero for B/s, one for KB/s, two for MB/s, and three for GB/s. */ double -calc_rate (long bytes, double msecs, int *units) +calc_rate (wgint bytes, double msecs, int *units) { double dlrate; @@ -272,11 +530,12 @@ calc_rate (long bytes, double msecs, int *units) if (msecs == 0) /* If elapsed time is exactly zero, it means we're under the - granularity of the timer. This often happens on systems that - use time() for the timer. */ - msecs = wtimer_granularity (); + resolution of the timer. This can easily happen on systems + that use time() for the timer. Since the interval lies between + 0 and the timer's resolution, assume half the resolution. */ + msecs = ptimer_resolution () / 2.0; - dlrate = (double)1000 * bytes / msecs; + dlrate = 1000.0 * bytes / msecs; if (dlrate < 1024.0) *units = 0; else if (dlrate < 1024.0 * 1024.0) @@ -284,8 +543,7 @@ calc_rate (long bytes, double msecs, int *units) else if (dlrate < 1024.0 * 1024.0 * 1024.0) *units = 2, dlrate /= (1024.0 * 1024.0); else - /* Maybe someone will need this one day. More realistically, it - will get tickled by buggy timers. */ + /* Maybe someone will need this, one day. */ *units = 3, dlrate /= (1024.0 * 1024.0 * 1024.0); return dlrate; @@ -315,6 +573,8 @@ calc_rate (long bytes, double msecs, int *units) } \ } while (0) +static char *getproxy PARAMS ((struct url *)); + /* Retrieve the given URL. Decides which loop to call -- HTTP, FTP, FTP, proxy, etc. */ @@ -338,9 +598,12 @@ retrieve_url (const char *origurl, char **file, char **newloc, char *saved_post_data = NULL; char *saved_post_file_name = NULL; - /* If dt is NULL, just ignore it. */ + /* If dt is NULL, use local storage. */ if (!dt) - dt = &dummy; + { + dt = &dummy; + dummy = 0; + } url = xstrdup (origurl); if (newloc) *newloc = NULL; @@ -447,7 +710,7 @@ retrieve_url (const char *origurl, char **file, char **newloc, newloc_parsed = url_parse (mynewloc, &up_error_code); if (!newloc_parsed) { - logprintf (LOG_NOTQUIET, "%s: %s.\n", mynewloc, + logprintf (LOG_NOTQUIET, "%s: %s.\n", escnonprint_uri (mynewloc), url_error (up_error_code)); url_free (u); xfree (url); @@ -506,7 +769,7 @@ retrieve_url (const char *origurl, char **file, char **newloc, if (file) *file = local_file ? local_file : NULL; else - FREE_MAYBE (local_file); + xfree_null (local_file); url_free (u); @@ -524,7 +787,6 @@ retrieve_url (const char *origurl, char **file, char **newloc, xfree (url); } - ++global_download_count; RESTORE_POST_DATA; return result; @@ -534,7 +796,8 @@ retrieve_url (const char *origurl, char **file, char **newloc, them. If HTML is non-zero, treat the file as HTML, and construct the URLs accordingly. - If opt.recursive is set, call recursive_retrieve() for each file. */ + If opt.recursive is set, call retrieve_tree() for each file. */ + uerr_t retrieve_from_file (const char *file, int html, int *count) { @@ -554,28 +817,29 @@ retrieve_from_file (const char *file, int html, int *count) if (cur_url->ignore_when_downloading) continue; - if (downloaded_exceeds_quota ()) + if (opt.quota && total_downloaded_bytes > opt.quota) { status = QUOTEXC; break; } - if (opt.recursive && cur_url->url->scheme != SCHEME_FTP) + if ((opt.recursive || opt.page_requisites) + && cur_url->url->scheme != SCHEME_FTP) status = retrieve_tree (cur_url->url->url); else status = retrieve_url (cur_url->url->url, &filename, &new_file, NULL, &dt); if (filename && opt.delete_after && file_exists_p (filename)) { - DEBUGP (("Removing file due to --delete-after in" - " retrieve_from_file():\n")); + DEBUGP (("\ +Removing file due to --delete-after in retrieve_from_file():\n")); logprintf (LOG_VERBOSE, _("Removing %s.\n"), filename); if (unlink (filename)) logprintf (LOG_NOTQUIET, "unlink: %s\n", strerror (errno)); dt &= ~RETROKF; } - FREE_MAYBE (new_file); - FREE_MAYBE (filename); + xfree_null (new_file); + xfree_null (filename); } /* Free the linked list of URL-s. */ @@ -592,40 +856,6 @@ printwhat (int n1, int n2) logputs (LOG_VERBOSE, (n1 == n2) ? _("Giving up.\n\n") : _("Retrying.\n\n")); } -/* Increment opt.downloaded by BY_HOW_MUCH. If an overflow occurs, - set opt.downloaded_overflow to 1. */ -void -downloaded_increase (unsigned long by_how_much) -{ - VERY_LONG_TYPE old; - if (opt.downloaded_overflow) - return; - old = opt.downloaded; - opt.downloaded += by_how_much; - if (opt.downloaded < old) /* carry flag, where are you when I - need you? */ - { - /* Overflow. */ - opt.downloaded_overflow = 1; - opt.downloaded = ~((VERY_LONG_TYPE)0); - } -} - -/* Return non-zero if the downloaded amount of bytes exceeds the - desired quota. If quota is not set or if the amount overflowed, 0 - is returned. */ -int -downloaded_exceeds_quota (void) -{ - if (!opt.quota) - return 0; - if (opt.downloaded_overflow) - /* We don't really know. (Wildly) assume not. */ - return 0; - - return opt.downloaded > opt.quota; -} - /* If opt.wait or opt.waitretry are specified, and if certain conditions are met, sleep the appropriate number of seconds. See the documentation of --wait and --waitretry for more information. @@ -649,9 +879,9 @@ sleep_between_retrievals (int count) /* If opt.waitretry is specified and this is a retry, wait for COUNT-1 number of seconds, or for opt.waitretry seconds. */ if (count <= opt.waitretry) - sleep (count - 1); + xsleep (count - 1.0); else - sleep (opt.waitretry); + xsleep (opt.waitretry); } else if (opt.wait) { @@ -659,19 +889,114 @@ sleep_between_retrievals (int count) /* If random-wait is not specified, or if we are sleeping between retries of the same download, sleep the fixed interval. */ - sleep (opt.wait); + xsleep (opt.wait); else { /* Sleep a random amount of time averaging in opt.wait seconds. The sleeping amount ranges from 0 to opt.wait*2, inclusive. */ - int waitsecs = random_number (opt.wait * 2 + 1); + double waitsecs = 2 * opt.wait * random_float (); + DEBUGP (("sleep_between_retrievals: avg=%f,sleep=%f\n", + opt.wait, waitsecs)); + xsleep (waitsecs); + } + } +} + +/* Free the linked list of urlpos. */ +void +free_urlpos (struct urlpos *l) +{ + while (l) + { + struct urlpos *next = l->next; + if (l->url) + url_free (l->url); + xfree_null (l->local_name); + xfree (l); + l = next; + } +} - DEBUGP (("sleep_between_retrievals: norm=%ld,fuzz=%ld,sleep=%d\n", - opt.wait, waitsecs - opt.wait, waitsecs)); +/* Rotate FNAME opt.backups times */ +void +rotate_backups(const char *fname) +{ + int maxlen = strlen (fname) + 1 + numdigit (opt.backups) + 1; + char *from = (char *)alloca (maxlen); + char *to = (char *)alloca (maxlen); + struct_stat sb; + int i; + + if (stat (fname, &sb) == 0) + if (S_ISREG (sb.st_mode) == 0) + return; - if (waitsecs) - sleep (waitsecs); - } + for (i = opt.backups; i > 1; i--) + { + sprintf (from, "%s.%d", fname, i - 1); + sprintf (to, "%s.%d", fname, i); + rename (from, to); + } + + sprintf (to, "%s.%d", fname, 1); + rename(fname, to); +} + +static int no_proxy_match PARAMS ((const char *, const char **)); + +/* Return the URL of the proxy appropriate for url U. */ + +static char * +getproxy (struct url *u) +{ + char *proxy = NULL; + char *rewritten_url; + static char rewritten_storage[1024]; + + if (!opt.use_proxy) + return NULL; + if (!no_proxy_match (u->host, (const char **)opt.no_proxy)) + return NULL; + + switch (u->scheme) + { + case SCHEME_HTTP: + proxy = opt.http_proxy ? opt.http_proxy : getenv ("http_proxy"); + break; +#ifdef HAVE_SSL + case SCHEME_HTTPS: + proxy = opt.https_proxy ? opt.https_proxy : getenv ("https_proxy"); + break; +#endif + case SCHEME_FTP: + proxy = opt.ftp_proxy ? opt.ftp_proxy : getenv ("ftp_proxy"); + break; + case SCHEME_INVALID: + break; } + if (!proxy || !*proxy) + return NULL; + + /* Handle shorthands. `rewritten_storage' is a kludge to allow + getproxy() to return static storage. */ + rewritten_url = rewrite_shorthand_url (proxy); + if (rewritten_url) + { + strncpy (rewritten_storage, rewritten_url, sizeof (rewritten_storage)); + rewritten_storage[sizeof (rewritten_storage) - 1] = '\0'; + proxy = rewritten_storage; + } + + return proxy; +} + +/* Should a host be accessed through proxy, concerning no_proxy? */ +static int +no_proxy_match (const char *host, const char **no_proxy) +{ + if (!no_proxy) + return 1; + else + return !sufmatch (no_proxy, host); }