curl: progress bar refresh, get width using ioctl()

Get screen width from the environment variable COLUMNS first, if set. If
not, use ioctl(). If nether works, assume 79.

Closes #2242

The "refresh" is for the -# output when no total transfer size is
known. It will now only use a single updated line even for this case:

The "-=O=-" ship moves when data is transferred. The four flying
"hashes" move (on a sine wave) on each refresh, independent of data.

src/tool_cb_prg.c

@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2014, 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -21,6 +21,10 @@
  ***************************************************************************/
 #include "tool_setup.h"
 
+#ifdef HAVE_SYS_IOCTL_H
+#include <sys/ioctl.h>
+#endif
+
 #define ENABLE_CURLX_PRINTF
 /* use our own printf() functions */
 #include "curlx.h"
@@ -31,6 +35,65 @@
 
 #include "memdebug.h" /* keep this as LAST include */
 
+/* 200 values generated by this perl code:
+
+   my $pi = 3.1415;
+   foreach my $i (1 .. 200) {
+     printf "%d, ", sin($i/200 * 2 * $pi) * 5000 + 5000;
+   }
+*/
+static const unsigned int sinus[] = {
+  5157, 5313, 5470, 5626, 5782, 5936, 6090, 6243, 6394, 6545, 6693, 6840, 6985,
+  7128, 7269, 7408, 7545, 7679, 7810, 7938, 8064, 8187, 8306, 8422, 8535, 8644,
+  8750, 8852, 8950, 9045, 9135, 9221, 9303, 9381, 9454, 9524, 9588, 9648, 9704,
+  9755, 9801, 9842, 9879, 9911, 9938, 9960, 9977, 9990, 9997, 9999, 9997, 9990,
+  9977, 9960, 9938, 9911, 9879, 9842, 9801, 9755, 9704, 9648, 9588, 9524, 9455,
+  9381, 9303, 9221, 9135, 9045, 8950, 8852, 8750, 8645, 8535, 8422, 8306, 8187,
+  8064, 7939, 7810, 7679, 7545, 7409, 7270, 7129, 6986, 6841, 6694, 6545, 6395,
+  6243, 6091, 5937, 5782, 5627, 5470, 5314, 5157, 5000, 4843, 4686, 4529, 4373,
+  4218, 4063, 3909, 3757, 3605, 3455, 3306, 3159, 3014, 2871, 2730, 2591, 2455,
+  2321, 2190, 2061, 1935, 1813, 1693, 1577, 1464, 1355, 1249, 1147, 1049, 955,
+  864, 778, 696, 618, 545, 476, 411, 351, 295, 244, 198, 157, 120, 88, 61, 39,
+  22, 9, 2, 0, 2, 9, 22, 39, 61, 88, 120, 156, 198, 244, 295, 350, 410, 475,
+  544, 618, 695, 777, 864, 954, 1048, 1146, 1248, 1354, 1463, 1576, 1692, 1812,
+  1934, 2060, 2188, 2320, 2454, 2590, 2729, 2870, 3013, 3158, 3305, 3454, 3604,
+  3755, 3908, 4062, 4216, 4372, 4528, 4685, 4842, 4999
+};
+
+static void fly(struct ProgressData *bar, bool moved)
+{
+  char buf[256];
+  int pos;
+  int check = bar->width - 2;
+
+  snprintf(buf, sizeof(buf), "%*s\r", bar->width-1, " ");
+  memcpy(&buf[bar->bar], "-=O=-", 5);
+
+  pos = sinus[bar->tick%200] / (10000 / check);
+  buf[pos] = '#';
+  pos = sinus[(bar->tick + 5)%200] / (10000 / check);
+  buf[pos] = '#';
+  pos = sinus[(bar->tick + 10)%200] / (10000 / check);
+  buf[pos] = '#';
+  pos = sinus[(bar->tick + 15)%200] / (10000 / check);
+  buf[pos] = '#';
+
+  fputs(buf, stderr);
+  bar->tick += 2;
+  if(bar->tick >= 200)
+    bar->tick -= 200;
+
+  bar->bar += (moved?bar->barmove:0);
+  if(bar->bar >= (bar->width - 6)) {
+    bar->barmove = -1;
+    bar->bar = bar->width - 6;
+  }
+  else if(bar->bar < 0) {
+    bar->barmove = 1;
+    bar->bar = 0;
+  }
+}
+
 /*
 ** callback for CURLOPT_XFERINFOFUNCTION
 */
@@ -74,27 +137,17 @@ int tool_progress_cb(void *clientp,
     }
     else {
       /* total is unknown */
-      if(bar->prev/1024 == point/1024)
-        /* the same kilobyte level as last invoke */
-        return 0;
-      else if(tvdiff(now, bar->prevtime) < 100L)
+      if(tvdiff(now, bar->prevtime) < 100L)
         /* limit progress-bar updating to 10 Hz */
         return 0;
+      fly(bar, point != bar->prev);
     }
   }
 
   /* simply count invokes */
   bar->calls++;
 
-  if(total < 1) {
-    curl_off_t prevblock = bar->prev / 1024;
-    curl_off_t thisblock = point / 1024;
-    while(thisblock > prevblock) {
-      fprintf(bar->out, "#");
-      prevblock++;
-    }
-  }
-  else if(point != bar->prev) {
+  if((total > 0) && (point != bar->prev)) {
     if(point > total)
       /* we have got more than the expected total! */
       total = point;
@@ -121,7 +174,6 @@ void progressbarinit(struct ProgressData *bar,
                      struct OperationConfig *config)
 {
   char *colp;
-
   memset(bar, 0, sizeof(struct ProgressData));
 
   /* pass this through to progress function so
@@ -134,14 +186,32 @@ void progressbarinit(struct ProgressData *bar,
   if(colp) {
     char *endptr;
     long num = strtol(colp, &endptr, 10);
-    if((endptr != colp) && (endptr == colp + strlen(colp)) && (num > 0))
+    if((endptr != colp) && (endptr == colp + strlen(colp)) && (num > 20))
       bar->width = (int)num;
-    else
-      bar->width = 79;
     curl_free(colp);
   }
-  else
+
+  if(!bar->width) {
+    int cols = 0;
+
+#ifdef TIOCGSIZE
+    struct ttysize ts;
+    if(!ioctl(STDIN_FILENO, TIOCGSIZE, &ts))
+      cols = ts.ts_cols;
+#elif defined(TIOCGWINSZ)
+    struct winsize ts;
+    if(!ioctl(STDIN_FILENO, TIOCGWINSZ, &ts))
+      cols = ts.ws_col;
+#endif /* TIOCGSIZE */
+    bar->width = cols;
+  }
+
+  if(!bar->width)
     bar->width = 79;
+  else if(bar->width > MAX_BARLENGTH)
+    bar->width = MAX_BARLENGTH;
 
   bar->out = config->global->errors;
+  bar->tick = 150;
+  bar->barmove = 1;
 }

src/tool_cb_prg.h

@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -33,6 +33,9 @@ struct ProgressData {
   int         width;
   FILE       *out;  /* where to write everything to */
   curl_off_t  initial_size;
+  unsigned int tick;
+  int bar;
+  int barmove;
 };
 
 void progressbarinit(struct ProgressData *bar,

tests/runtests.pl

@@ -6,7 +6,7 @@
 #                            | (__| |_| |  _ <| |___
 #                             \___|\___/|_| \_\_____|
 #
-# Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+# Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
 #
 # This software is licensed as described in the file COPYING, which
 # you should have received as part of this distribution. The terms
@@ -340,6 +340,7 @@ sub logmsg {
 $ENV{'CURL_ENTROPY'}="12345678";
 $ENV{'CURL_FORCETIME'}=1; # for debug NTLM magic
 $ENV{'HOME'}=$pwd;
+$ENV{'COLUMNS'}=79; # screen width!
 
 sub catch_zap {
     my $signame = shift;