/* Download progress. Copyright (C) 2001, 2002 Free Software Foundation, Inc. This file is part of GNU Wget. GNU Wget is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. GNU Wget is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Wget; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. In addition, as a special exception, the Free Software Foundation gives permission to link the code of its release of Wget with the OpenSSL project's "OpenSSL" library (or with modified versions of it that use the same license as the "OpenSSL" library), and distribute the linked executables. You must obey the GNU General Public License in all respects for all of the code used other than "OpenSSL". If you modify this file, you may extend this exception to your version of the file, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version. */ #include #include #include #ifdef HAVE_STRING_H # include #else # include #endif /* HAVE_STRING_H */ #include #ifdef HAVE_UNISTD_H # include #endif #ifdef HAVE_SIGNAL_H # include #endif #include "wget.h" #include "progress.h" #include "utils.h" #include "retr.h" struct progress_implementation { const char *name; int interactive; void *(*create) PARAMS ((wgint, wgint)); void (*update) PARAMS ((void *, wgint, double)); void (*finish) PARAMS ((void *, double)); void (*set_params) PARAMS ((const char *)); }; /* Necessary forward declarations. */ static void *dot_create PARAMS ((wgint, wgint)); static void dot_update PARAMS ((void *, wgint, double)); static void dot_finish PARAMS ((void *, double)); static void dot_set_params PARAMS ((const char *)); static void *bar_create PARAMS ((wgint, wgint)); static void bar_update PARAMS ((void *, wgint, double)); static void bar_finish PARAMS ((void *, double)); static void bar_set_params PARAMS ((const char *)); static struct progress_implementation implementations[] = { { "dot", 0, dot_create, dot_update, dot_finish, dot_set_params }, { "bar", 1, bar_create, bar_update, bar_finish, bar_set_params } }; static struct progress_implementation *current_impl; static int current_impl_locked; /* Progress implementation used by default. Can be overriden in wgetrc or by the fallback one. */ #define DEFAULT_PROGRESS_IMPLEMENTATION "bar" /* Fallnback progress implementation should be something that works under all display types. If you put something other than "dot" here, remember that bar_set_params tries to switch to this if we're not running on a TTY. So changing this to "bar" could cause infloop. */ #define FALLBACK_PROGRESS_IMPLEMENTATION "dot" /* Return non-zero if NAME names a valid progress bar implementation. The characters after the first : will be ignored. */ int valid_progress_implementation_p (const char *name) { int i; struct progress_implementation *pi = implementations; char *colon = strchr (name, ':'); int namelen = colon ? colon - name : strlen (name); for (i = 0; i < countof (implementations); i++, pi++) if (!strncmp (pi->name, name, namelen)) return 1; return 0; } /* Set the progress implementation to NAME. */ void set_progress_implementation (const char *name) { int i, namelen; struct progress_implementation *pi = implementations; char *colon; if (!name) name = DEFAULT_PROGRESS_IMPLEMENTATION; colon = strchr (name, ':'); namelen = colon ? colon - name : strlen (name); for (i = 0; i < countof (implementations); i++, pi++) if (!strncmp (pi->name, name, namelen)) { current_impl = pi; current_impl_locked = 0; if (colon) /* We call pi->set_params even if colon is NULL because we want to give the implementation a chance to set up some things it needs to run. */ ++colon; if (pi->set_params) pi->set_params (colon); return; } abort (); } static int output_redirected; void progress_schedule_redirect (void) { output_redirected = 1; } /* Create a progress gauge. INITIAL is the number of bytes the download starts from (zero if the download starts from scratch). TOTAL is the expected total number of bytes in this download. If TOTAL is zero, it means that the download size is not known in advance. */ void * progress_create (wgint initial, wgint total) { /* Check if the log status has changed under our feet. */ if (output_redirected) { if (!current_impl_locked) set_progress_implementation (FALLBACK_PROGRESS_IMPLEMENTATION); output_redirected = 0; } return current_impl->create (initial, total); } /* Return non-zero if the progress gauge is "interactive", i.e. if it can profit from being called regularly even in absence of data. The progress bar is interactive because it regularly updates the ETA and current update. */ int progress_interactive_p (void *progress) { return current_impl->interactive; } /* Inform the progress gauge of newly received bytes. DLTIME is the time in milliseconds since the beginning of the download. */ void progress_update (void *progress, wgint howmuch, double dltime) { current_impl->update (progress, howmuch, dltime); } /* Tell the progress gauge to clean up. Calling this will free the PROGRESS object, the further use of which is not allowed. */ void progress_finish (void *progress, double dltime) { current_impl->finish (progress, dltime); } /* Dot-printing. */ struct dot_progress { wgint initial_length; /* how many bytes have been downloaded previously. */ wgint total_length; /* expected total byte count when the download finishes */ int accumulated; int rows; /* number of rows printed so far */ int dots; /* number of dots printed in this row */ double last_timer_value; }; /* Dot-progress backend for progress_create. */ static void * dot_create (wgint initial, wgint total) { struct dot_progress *dp = xnew0 (struct dot_progress); dp->initial_length = initial; dp->total_length = total; if (dp->initial_length) { int dot_bytes = opt.dot_bytes; wgint row_bytes = opt.dot_bytes * opt.dots_in_line; int remainder = (int) (dp->initial_length % row_bytes); wgint skipped = dp->initial_length - remainder; if (skipped) { int skipped_k = (int) (skipped / 1024); /* skipped amount in K */ int skipped_k_len = numdigit (skipped_k); if (skipped_k_len < 5) skipped_k_len = 5; /* Align the [ skipping ... ] line with the dots. To do that, insert the number of spaces equal to the number of digits in the skipped amount in K. */ logprintf (LOG_VERBOSE, _("\n%*s[ skipping %dK ]"), 2 + skipped_k_len, "", skipped_k); } logprintf (LOG_VERBOSE, "\n%5ldK", (long) (skipped / 1024)); for (; remainder >= dot_bytes; remainder -= dot_bytes) { if (dp->dots % opt.dot_spacing == 0) logputs (LOG_VERBOSE, " "); logputs (LOG_VERBOSE, ","); ++dp->dots; } assert (dp->dots < opt.dots_in_line); dp->accumulated = remainder; dp->rows = skipped / row_bytes; } return dp; } static void print_percentage (wgint bytes, wgint expected) { int percentage = (int)(100.0 * bytes / expected); logprintf (LOG_VERBOSE, "%3d%%", percentage); } static void print_download_speed (struct dot_progress *dp, wgint bytes, double dltime) { logprintf (LOG_VERBOSE, " %s", retr_rate (bytes, dltime - dp->last_timer_value, 1)); dp->last_timer_value = dltime; } /* Dot-progress backend for progress_update. */ static void dot_update (void *progress, wgint howmuch, double dltime) { struct dot_progress *dp = progress; int dot_bytes = opt.dot_bytes; wgint row_bytes = opt.dot_bytes * opt.dots_in_line; log_set_flush (0); dp->accumulated += howmuch; for (; dp->accumulated >= dot_bytes; dp->accumulated -= dot_bytes) { if (dp->dots == 0) logprintf (LOG_VERBOSE, "\n%5ldK", (long) (dp->rows * row_bytes / 1024)); if (dp->dots % opt.dot_spacing == 0) logputs (LOG_VERBOSE, " "); logputs (LOG_VERBOSE, "."); ++dp->dots; if (dp->dots >= opt.dots_in_line) { wgint row_qty = row_bytes; if (dp->rows == dp->initial_length / row_bytes) row_qty -= dp->initial_length % row_bytes; ++dp->rows; dp->dots = 0; if (dp->total_length) print_percentage (dp->rows * row_bytes, dp->total_length); print_download_speed (dp, row_qty, dltime); } } log_set_flush (1); } /* Dot-progress backend for progress_finish. */ static void dot_finish (void *progress, double dltime) { struct dot_progress *dp = progress; int dot_bytes = opt.dot_bytes; wgint row_bytes = opt.dot_bytes * opt.dots_in_line; int i; log_set_flush (0); if (dp->dots == 0) logprintf (LOG_VERBOSE, "\n%5ldK", (long) (dp->rows * row_bytes / 1024)); for (i = dp->dots; i < opt.dots_in_line; i++) { if (i % opt.dot_spacing == 0) logputs (LOG_VERBOSE, " "); logputs (LOG_VERBOSE, " "); } if (dp->total_length) { print_percentage (dp->rows * row_bytes + dp->dots * dot_bytes + dp->accumulated, dp->total_length); } { wgint row_qty = dp->dots * dot_bytes + dp->accumulated; if (dp->rows == dp->initial_length / row_bytes) row_qty -= dp->initial_length % row_bytes; print_download_speed (dp, row_qty, dltime); } logputs (LOG_VERBOSE, "\n\n"); log_set_flush (0); xfree (dp); } /* This function interprets the progress "parameters". For example, if Wget is invoked with --progress=dot:mega, it will set the "dot-style" to "mega". Valid styles are default, binary, mega, and giga. */ static void dot_set_params (const char *params) { if (!params || !*params) params = opt.dot_style; if (!params) return; /* We use this to set the retrieval style. */ if (!strcasecmp (params, "default")) { /* Default style: 1K dots, 10 dots in a cluster, 50 dots in a line. */ opt.dot_bytes = 1024; opt.dot_spacing = 10; opt.dots_in_line = 50; } else if (!strcasecmp (params, "binary")) { /* "Binary" retrieval: 8K dots, 16 dots in a cluster, 48 dots (384K) in a line. */ opt.dot_bytes = 8192; opt.dot_spacing = 16; opt.dots_in_line = 48; } else if (!strcasecmp (params, "mega")) { /* "Mega" retrieval, for retrieving very long files; each dot is 64K, 8 dots in a cluster, 6 clusters (3M) in a line. */ opt.dot_bytes = 65536L; opt.dot_spacing = 8; opt.dots_in_line = 48; } else if (!strcasecmp (params, "giga")) { /* "Giga" retrieval, for retrieving very very *very* long files; each dot is 1M, 8 dots in a cluster, 4 clusters (32M) in a line. */ opt.dot_bytes = (1L << 20); opt.dot_spacing = 8; opt.dots_in_line = 32; } else fprintf (stderr, _("Invalid dot style specification `%s'; leaving unchanged.\n"), params); } /* "Thermometer" (bar) progress. */ /* Assumed screen width if we can't find the real value. */ #define DEFAULT_SCREEN_WIDTH 80 /* Minimum screen width we'll try to work with. If this is too small, create_image will overflow the buffer. */ #define MINIMUM_SCREEN_WIDTH 45 /* The last known screen width. This can be updated by the code that detects that SIGWINCH was received (but it's never updated from the signal handler). */ static int screen_width; /* A flag that, when set, means SIGWINCH was received. */ static volatile sig_atomic_t received_sigwinch; /* Size of the download speed history ring. */ #define DLSPEED_HISTORY_SIZE 20 /* The minimum time length of a history sample. By default, each sample is at least 150ms long, which means that, over the course of 20 samples, "current" download speed spans at least 3s into the past. */ #define DLSPEED_SAMPLE_MIN 150 /* The time after which the download starts to be considered "stalled", i.e. the current bandwidth is not printed and the recent download speeds are scratched. */ #define STALL_START_TIME 5000 struct bar_progress { wgint initial_length; /* how many bytes have been downloaded previously. */ wgint total_length; /* expected total byte count when the download finishes */ wgint count; /* bytes downloaded so far */ double last_screen_update; /* time of the last screen update, measured since the beginning of download. */ int width; /* screen width we're using at the time the progress gauge was created. this is different from the screen_width global variable in that the latter can be changed by a signal. */ char *buffer; /* buffer where the bar "image" is stored. */ int tick; /* counter used for drawing the progress bar where the total size is not known. */ /* The following variables (kept in a struct for namespace reasons) keep track of recent download speeds. See bar_update() for details. */ struct bar_progress_hist { int pos; wgint times[DLSPEED_HISTORY_SIZE]; wgint bytes[DLSPEED_HISTORY_SIZE]; /* The sum of times and bytes respectively, maintained for efficiency. */ wgint total_time; wgint total_bytes; } hist; double recent_start; /* timestamp of beginning of current position. */ wgint recent_bytes; /* bytes downloaded so far. */ int stalled; /* set when no data arrives for longer than STALL_START_TIME, then reset when new data arrives. */ /* create_image() uses these to make sure that ETA information doesn't flicker. */ double last_eta_time; /* time of the last update to download speed and ETA, measured since the beginning of download. */ wgint last_eta_value; }; static void create_image PARAMS ((struct bar_progress *, double)); static void display_image PARAMS ((char *)); static void * bar_create (wgint initial, wgint total) { struct bar_progress *bp = xnew0 (struct bar_progress); /* In theory, our callers should take care of this pathological case, but it can sometimes happen. */ if (initial > total) total = initial; bp->initial_length = initial; bp->total_length = total; /* Initialize screen_width if this hasn't been done or if it might have changed, as indicated by receiving SIGWINCH. */ if (!screen_width || received_sigwinch) { screen_width = determine_screen_width (); if (!screen_width) screen_width = DEFAULT_SCREEN_WIDTH; else if (screen_width < MINIMUM_SCREEN_WIDTH) screen_width = MINIMUM_SCREEN_WIDTH; received_sigwinch = 0; } /* - 1 because we don't want to use the last screen column. */ bp->width = screen_width - 1; /* + 1 for the terminating zero. */ bp->buffer = xmalloc (bp->width + 1); logputs (LOG_VERBOSE, "\n"); create_image (bp, 0.0); display_image (bp->buffer); return bp; } static void update_speed_ring PARAMS ((struct bar_progress *, wgint, double)); static void bar_update (void *progress, wgint howmuch, double dltime) { struct bar_progress *bp = progress; int force_screen_update = 0; bp->count += howmuch; if (bp->total_length > 0 && bp->count + bp->initial_length > bp->total_length) /* We could be downloading more than total_length, e.g. when the server sends an incorrect Content-Length header. In that case, adjust bp->total_length to the new reality, so that the code in create_image() that depends on total size being smaller or equal to the expected size doesn't abort. */ bp->total_length = bp->initial_length + bp->count; update_speed_ring (bp, howmuch, dltime); /* If SIGWINCH (the window size change signal) been received, determine the new screen size and update the screen. */ if (received_sigwinch) { int old_width = screen_width; screen_width = determine_screen_width (); if (!screen_width) screen_width = DEFAULT_SCREEN_WIDTH; else if (screen_width < MINIMUM_SCREEN_WIDTH) screen_width = MINIMUM_SCREEN_WIDTH; if (screen_width != old_width) { bp->width = screen_width - 1; bp->buffer = xrealloc (bp->buffer, bp->width + 1); force_screen_update = 1; } received_sigwinch = 0; } if (dltime - bp->last_screen_update < 200 && !force_screen_update) /* Don't update more often than five times per second. */ return; create_image (bp, dltime); display_image (bp->buffer); bp->last_screen_update = dltime; } static void bar_finish (void *progress, double dltime) { struct bar_progress *bp = progress; if (bp->total_length > 0 && bp->count + bp->initial_length > bp->total_length) /* See bar_update() for explanation. */ bp->total_length = bp->initial_length + bp->count; create_image (bp, dltime); display_image (bp->buffer); logputs (LOG_VERBOSE, "\n\n"); xfree (bp->buffer); xfree (bp); } /* This code attempts to maintain the notion of a "current" download speed, over the course of no less than 3s. (Shorter intervals produce very erratic results.) To do so, it samples the speed in 150ms intervals and stores the recorded samples in a FIFO history ring. The ring stores no more than 20 intervals, hence the history covers the period of at least three seconds and at most 20 reads into the past. This method should produce reasonable results for downloads ranging from very slow to very fast. The idea is that for fast downloads, we get the speed over exactly the last three seconds. For slow downloads (where a network read takes more than 150ms to complete), we get the speed over a larger time period, as large as it takes to complete thirty reads. This is good because slow downloads tend to fluctuate more and a 3-second average would be too erratic. */ static void update_speed_ring (struct bar_progress *bp, wgint howmuch, double dltime) { struct bar_progress_hist *hist = &bp->hist; double recent_age = dltime - bp->recent_start; /* Update the download count. */ bp->recent_bytes += howmuch; /* For very small time intervals, we return after having updated the "recent" download count. When its age reaches or exceeds minimum sample time, it will be recorded in the history ring. */ if (recent_age < DLSPEED_SAMPLE_MIN) return; if (howmuch == 0) { /* If we're not downloading anything, we might be stalling, i.e. not downloading anything for an extended period of time. Since 0-reads do not enter the history ring, recent_age effectively measures the time since last read. */ if (recent_age >= STALL_START_TIME) { /* If we're stalling, reset the ring contents because it's stale and because it will make bar_update stop printing the (bogus) current bandwidth. */ bp->stalled = 1; xzero (*hist); bp->recent_bytes = 0; } return; } /* We now have a non-zero amount of to store to the speed ring. */ /* If the stall status was acquired, reset it. */ if (bp->stalled) { bp->stalled = 0; /* "recent_age" includes the the entired stalled period, which could be very long. Don't update the speed ring with that value because the current bandwidth would start too small. Start with an arbitrary (but more reasonable) time value and let it level out. */ recent_age = 1000; } /* Store "recent" bytes and download time to history ring at the position POS. */ /* To correctly maintain the totals, first invalidate existing data (least recent in time) at this position. */ hist->total_time -= hist->times[hist->pos]; hist->total_bytes -= hist->bytes[hist->pos]; /* Now store the new data and update the totals. */ hist->times[hist->pos] = recent_age; hist->bytes[hist->pos] = bp->recent_bytes; hist->total_time += recent_age; hist->total_bytes += bp->recent_bytes; /* Start a new "recent" period. */ bp->recent_start = dltime; bp->recent_bytes = 0; /* Advance the current ring position. */ if (++hist->pos == DLSPEED_HISTORY_SIZE) hist->pos = 0; #if 0 /* Sledgehammer check to verify that the totals are accurate. */ { int i; double sumt = 0, sumb = 0; for (i = 0; i < DLSPEED_HISTORY_SIZE; i++) { sumt += hist->times[i]; sumb += hist->bytes[i]; } assert (sumt == hist->total_time); assert (sumb == hist->total_bytes); } #endif } #define APPEND_LITERAL(s) do { \ memcpy (p, s, sizeof (s) - 1); \ p += sizeof (s) - 1; \ } while (0) #ifndef MAX # define MAX(a, b) ((a) >= (b) ? (a) : (b)) #endif static void create_image (struct bar_progress *bp, double dl_total_time) { char *p = bp->buffer; wgint size = bp->initial_length + bp->count; char *size_legible = with_thousand_seps (size); int size_legible_len = strlen (size_legible); struct bar_progress_hist *hist = &bp->hist; /* The progress bar should look like this: xx% [=======> ] nn,nnn 12.34K/s ETA 00:00 Calculate the geometry. The idea is to assign as much room as possible to the progress bar. The other idea is to never let things "jitter", i.e. pad elements that vary in size so that their variance does not affect the placement of other elements. It would be especially bad for the progress bar to be resized randomly. "xx% " or "100%" - percentage - 4 chars "[]" - progress bar decorations - 2 chars " nnn,nnn,nnn" - downloaded bytes - 12 chars or very rarely more " 1012.56K/s" - dl rate - 11 chars " ETA xx:xx:xx" - ETA - 13 chars "=====>..." - progress bar - the rest */ int dlbytes_size = 1 + MAX (size_legible_len, 11); int progress_size = bp->width - (4 + 2 + dlbytes_size + 11 + 13); if (progress_size < 5) progress_size = 0; /* "xx% " */ if (bp->total_length > 0) { int percentage = (int)(100.0 * size / bp->total_length); assert (percentage <= 100); if (percentage < 100) sprintf (p, "%2d%% ", percentage); else strcpy (p, "100%"); p += 4; } else APPEND_LITERAL (" "); /* The progress bar: "[====> ]" or "[++==> ]". */ if (progress_size && bp->total_length > 0) { /* Size of the initial portion. */ int insz = (double)bp->initial_length / bp->total_length * progress_size; /* Size of the downloaded portion. */ int dlsz = (double)size / bp->total_length * progress_size; char *begin; int i; assert (dlsz <= progress_size); assert (insz <= dlsz); *p++ = '['; begin = p; /* Print the initial portion of the download with '+' chars, the rest with '=' and one '>'. */ for (i = 0; i < insz; i++) *p++ = '+'; dlsz -= insz; if (dlsz > 0) { for (i = 0; i < dlsz - 1; i++) *p++ = '='; *p++ = '>'; } while (p - begin < progress_size) *p++ = ' '; *p++ = ']'; } else if (progress_size) { /* If we can't draw a real progress bar, then at least show *something* to the user. */ int ind = bp->tick % (progress_size * 2 - 6); int i, pos; /* Make the star move in two directions. */ if (ind < progress_size - 2) pos = ind + 1; else pos = progress_size - (ind - progress_size + 5); *p++ = '['; for (i = 0; i < progress_size; i++) { if (i == pos - 1) *p++ = '<'; else if (i == pos ) *p++ = '='; else if (i == pos + 1) *p++ = '>'; else *p++ = ' '; } *p++ = ']'; ++bp->tick; } /* " 234,567,890" */ sprintf (p, " %-11s", with_thousand_seps (size)); p += strlen (p); /* " 1012.45K/s" */ if (hist->total_time && hist->total_bytes) { static const char *short_units[] = { "B/s", "K/s", "M/s", "G/s" }; int units = 0; /* Calculate the download speed using the history ring and recent data that hasn't made it to the ring yet. */ wgint dlquant = hist->total_bytes + bp->recent_bytes; double dltime = hist->total_time + (dl_total_time - bp->recent_start); double dlspeed = calc_rate (dlquant, dltime, &units); sprintf (p, " %7.2f%s", dlspeed, short_units[units]); p += strlen (p); } else APPEND_LITERAL (" --.--K/s"); /* " ETA xx:xx:xx"; wait for three seconds before displaying the ETA. That's because the ETA value needs a while to become reliable. */ if (bp->total_length > 0 && bp->count > 0 && dl_total_time > 3000) { wgint eta; int eta_hrs, eta_min, eta_sec; /* Don't change the value of ETA more than approximately once per second; doing so would cause flashing without providing any value to the user. */ if (bp->total_length != size && bp->last_eta_value != 0 && dl_total_time - bp->last_eta_time < 900) eta = bp->last_eta_value; else { /* Calculate ETA using the average download speed to predict the future speed. If you want to use a speed averaged over a more recent period, replace dl_total_time with hist->total_time and bp->count with hist->total_bytes. I found that doing that results in a very jerky and ultimately unreliable ETA. */ double time_sofar = (double)dl_total_time / 1000; wgint bytes_remaining = bp->total_length - size; eta = (wgint) (time_sofar * bytes_remaining / bp->count); bp->last_eta_value = eta; bp->last_eta_time = dl_total_time; } eta_hrs = eta / 3600, eta %= 3600; eta_min = eta / 60, eta %= 60; eta_sec = eta; if (eta_hrs > 99) goto no_eta; if (eta_hrs == 0) { /* Hours not printed: pad with three spaces. */ APPEND_LITERAL (" "); sprintf (p, " ETA %02d:%02d", eta_min, eta_sec); } else { if (eta_hrs < 10) /* Hours printed with one digit: pad with one space. */ *p++ = ' '; sprintf (p, " ETA %d:%02d:%02d", eta_hrs, eta_min, eta_sec); } p += strlen (p); } else if (bp->total_length > 0) { no_eta: APPEND_LITERAL (" "); } assert (p - bp->buffer <= bp->width); while (p < bp->buffer + bp->width) *p++ = ' '; *p = '\0'; } /* Print the contents of the buffer as a one-line ASCII "image" so that it can be overwritten next time. */ static void display_image (char *buf) { int old = log_set_save_context (0); logputs (LOG_VERBOSE, "\r"); logputs (LOG_VERBOSE, buf); log_set_save_context (old); } static void bar_set_params (const char *params) { char *term = getenv ("TERM"); if (params && 0 == strcmp (params, "force")) current_impl_locked = 1; if ((opt.lfilename #ifdef HAVE_ISATTY /* The progress bar doesn't make sense if the output is not a TTY -- when logging to file, it is better to review the dots. */ || !isatty (fileno (stderr)) #endif /* Normally we don't depend on terminal type because the progress bar only uses ^M to move the cursor to the beginning of line, which works even on dumb terminals. But Jamie Zawinski reports that ^M and ^H tricks don't work in Emacs shell buffers, and only make a mess. */ || (term && 0 == strcmp (term, "emacs")) ) && !current_impl_locked) { /* We're not printing to a TTY, so revert to the fallback display. #### We're recursively calling set_progress_implementation here, which is slightly kludgy. It would be nicer if we provided that function a return value indicating a failure of some sort. */ set_progress_implementation (FALLBACK_PROGRESS_IMPLEMENTATION); return; } } #ifdef SIGWINCH RETSIGTYPE progress_handle_sigwinch (int sig) { received_sigwinch = 1; signal (SIGWINCH, progress_handle_sigwinch); } #endif