[Bug 1052653] [NEW] cal doesn't remove all formatting when stdout is a pipe

[Andrew Pollock]

Public bug reported:

$ date
Tue Sep 18 13:20:02 PDT 2012

$ cal | hexdump -C
00000000  20 20 20 53 65 70 74 65  6d 62 65 72 20 32 30 31  |   September 201|
00000010  32 20 20 20 20 20 0a 53  75 20 4d 6f 20 54 75 20  |2     .Su Mo Tu |
00000020  57 65 20 54 68 20 46 72  20 53 61 20 20 0a 20 20  |We Th Fr Sa  .  |
00000030  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
00000040  20 31 20 20 0a 20 32 20  20 33 20 20 34 20 20 35  | 1  . 2  3  4  5|
00000050  20 20 36 20 20 37 20 20  38 20 20 0a 20 39 20 31  |  6  7  8  . 9 1|
00000060  30 20 31 31 20 31 32 20  31 33 20 31 34 20 31 35  |0 11 12 13 14 15|
00000070  20 20 0a 31 36 20 31 37  20 5f 08 31 5f 08 38 20  |  .16 17 _.1_.8 |
00000080  31 39 20 32 30 20 32 31  20 32 32 20 20 0a 32 33  |19 20 21 22  .23|
00000090  20 32 34 20 32 35 20 32  36 20 32 37 20 32 38 20  | 24 25 26 27 28 |
000000a0  32 39 20 20 0a 33 30 20  20 20 20 20 20 20 20 20  |29  .30         |
000000b0  20 20 20 20 20 20 20 20  20 20 20 0a              |           .|
000000bc

Note the extra characters around the 1 and the 8 of 18. Compare with:

$ cal -h | hexdump -C
00000000  20 20 20 53 65 70 74 65  6d 62 65 72 20 32 30 31  |   September 201|
00000010  32 20 20 20 20 20 0a 53  75 20 4d 6f 20 54 75 20  |2     .Su Mo Tu |
00000020  57 65 20 54 68 20 46 72  20 53 61 20 20 0a 20 20  |We Th Fr Sa  .  |
00000030  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
00000040  20 31 20 20 0a 20 32 20  20 33 20 20 34 20 20 35  | 1  . 2  3  4  5|
00000050  20 20 36 20 20 37 20 20  38 20 20 0a 20 39 20 31  |  6  7  8  . 9 1|
00000060  30 20 31 31 20 31 32 20  31 33 20 31 34 20 31 35  |0 11 12 13 14 15|
00000070  20 20 0a 31 36 20 31 37  20 31 38 20 31 39 20 32  |  .16 17 18 19 2|
00000080  30 20 32 31 20 32 32 20  20 0a 32 33 20 32 34 20  |0 21 22  .23 24 |
00000090  32 35 20 32 36 20 32 37  20 32 38 20 32 39 20 20  |25 26 27 28 29  |
000000a0  0a 33 30 20 20 20 20 20  20 20 20 20 20 20 20 20  |.30             |
000000b0  20 20 20 20 20 20 20 0a                           |       .|
000000b8

** Affects: bsdmainutils (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1052653

Title:
  cal doesn't remove all formatting when stdout is a pipe

Status in “bsdmainutils” package in Ubuntu:
  New

Bug description:
  $ date
  Tue Sep 18 13:20:02 PDT 2012

  $ cal | hexdump -C
  00000000  20 20 20 53 65 70 74 65  6d 62 65 72 20 32 30 31  |   September 201|
  00000010  32 20 20 20 20 20 0a 53  75 20 4d 6f 20 54 75 20  |2     .Su Mo Tu |
  00000020  57 65 20 54 68 20 46 72  20 53 61 20 20 0a 20 20  |We Th Fr Sa  .  |
  00000030  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
  00000040  20 31 20 20 0a 20 32 20  20 33 20 20 34 20 20 35  | 1  . 2  3  4  5|
  00000050  20 20 36 20 20 37 20 20  38 20 20 0a 20 39 20 31  |  6  7  8  . 9 1|
  00000060  30 20 31 31 20 31 32 20  31 33 20 31 34 20 31 35  |0 11 12 13 14 15|
  00000070  20 20 0a 31 36 20 31 37  20 5f 08 31 5f 08 38 20  |  .16 17 _.1_.8 |
  00000080  31 39 20 32 30 20 32 31  20 32 32 20 20 0a 32 33  |19 20 21 22  .23|
  00000090  20 32 34 20 32 35 20 32  36 20 32 37 20 32 38 20  | 24 25 26 27 28 |
  000000a0  32 39 20 20 0a 33 30 20  20 20 20 20 20 20 20 20  |29  .30         |
  000000b0  20 20 20 20 20 20 20 20  20 20 20 0a              |           .|
  000000bc

  Note the extra characters around the 1 and the 8 of 18. Compare with:

  $ cal -h | hexdump -C
  00000000  20 20 20 53 65 70 74 65  6d 62 65 72 20 32 30 31  |   September 201|
  00000010  32 20 20 20 20 20 0a 53  75 20 4d 6f 20 54 75 20  |2     .Su Mo Tu |
  00000020  57 65 20 54 68 20 46 72  20 53 61 20 20 0a 20 20  |We Th Fr Sa  .  |
  00000030  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
  00000040  20 31 20 20 0a 20 32 20  20 33 20 20 34 20 20 35  | 1  . 2  3  4  5|
  00000050  20 20 36 20 20 37 20 20  38 20 20 0a 20 39 20 31  |  6  7  8  . 9 1|
  00000060  30 20 31 31 20 31 32 20  31 33 20 31 34 20 31 35  |0 11 12 13 14 15|
  00000070  20 20 0a 31 36 20 31 37  20 31 38 20 31 39 20 32  |  .16 17 18 19 2|
  00000080  30 20 32 31 20 32 32 20  20 0a 32 33 20 32 34 20  |0 21 22  .23 24 |
  00000090  32 35 20 32 36 20 32 37  20 32 38 20 32 39 20 20  |25 26 27 28 29  |
  000000a0  0a 33 30 20 20 20 20 20  20 20 20 20 20 20 20 20  |.30             |
  000000b0  20 20 20 20 20 20 20 0a                           |       .|
  000000b8

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