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  1. echoerr() { printf "%s\n" "$*" >&2; }
  2.  
  3. dump_string_char()
  4. {
  5.   local string len_str idx this_char this_int
  6.   string="$1"
  7.   echoerr "string: \"\"\"$string\"\"\"" 
  8.   len_str="${#string}"
  9.   idx=0
  10.   while [ $idx -lt ${len_str} ]; do
  11.     this_char="${string:$idx:1}"
  12.     this_int="$(LC_CTYPE=C printf "%d" "'$this_char")"
  13.     echoerr "idx: $idx"
  14.     if [ $this_int -lt 32 ]; then
  15.       echoerr "$idx: ${this_int}" 
  16.     else
  17.       echoerr "$idx: \"${this_char}\"" 
  18.     fi
  19.     ((idx++))
  20.   done
  21. }
  22.  
  23. second_function()
  24. {
  25.   local second_ini_buffer result2_buffer
  26.   second_ini_buffer="$1"
  27.  
  28.   # Some magical awk/sed that did not match any pattern
  29.   # So let us use 'echo' to re-save the same string
  30.  
  31.   IFS= read -rd '' result2_buffer < <(echo "$second_ini_buffer")
  32.   echoerr "result2_buffer len: ${#result2_buffer}"
  33.   echoerr "\"\"\"$result2_buffer\"\"\""
  34.   # so pass back the full ini_buffer as-is.
  35.   # hopefully with ONE chr(1) at end-of-line.
  36.   # but it doesn't.
  37.  
  38.   echo "$result2_buffer"
  39. }
  40.  
  41.  
  42. first_function()
  43. {
  44.   local first_buffer result1_buffer
  45.   # takes a string with a single chr(10)
  46.   first_buffer="$1"
  47.  
  48.   # calls a function, which does nothing.
  49.   IFS= read -rd '' result1_buffer < <(second_function "$first_buffer")
  50.   # IFS= read -rd '' result1_buffer < <(echo "$first_buffer")
  51.   # yet it got prepended by another chr(10) for a total of two chr(10)
  52.  
  53. echoerr "result1_buffer len: ${#result1_buffer}"
  54. echoerr "\"\"\"$result1_buffer\"\"\""
  55.   # Suuposedly only one way to return a multi-line string neatly, 
  56.   # and that is via STDOUT (fd=1)
  57.   # echo "first_buffer len: ${#first_buffer}"
  58.   echo "$result1_buffer"
  59. }
  60.  
  61.  
  62. # there is exactly one chr(10) at the end of ini_buffer
  63. ini_buffer="1.2.3.4
  64. "
  65. echoerr "initial ini_buffer \"\"\"$ini_buffer\"\"\""
  66. echoerr "initial ini_buffer len: ${#ini_buffer}"
  67. echoerr
  68. dump_string_char "$ini_buffer"
  69.  
  70.  
  71. IFS= read -rd '' result < <(first_function "$ini_buffer")
  72. # got a SECOND chr(10) prepended to the final output 
  73. # for a total of 3 prepended chr(10)s
  74.  
  75. echoerr "result len: ${#result}"
  76. echoerr "\"\"\"$result\"\"\""
  77. echoerr
  78.  
Success #stdin #stdout #stderr 0.01s 5544KB
comments (?)
stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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initial ini_buffer """1.2.3.4
"""
initial ini_buffer len: 8

string: """1.2.3.4
"""
idx: 0
0: "1"
idx: 1
1: "."
idx: 2
2: "2"
idx: 3
3: "."
idx: 4
4: "3"
idx: 5
5: "."
idx: 6
6: "4"
idx: 7
7: 10
result2_buffer len: 9
"""1.2.3.4

"""
result1_buffer len: 10
"""1.2.3.4


"""
result len: 11
"""1.2.3.4



"""
https://ideone.com/Y6OYiR
language:
Bash (bash 5.0.3)
created:
3 years ago
visibility:
secret

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