Program received signal SIGSEGV, Segmentation fault.

[Bruce Korb]

This is a clumsy way of saying you don't like the '©' character in strings.
I truly do dislike the fact that that you changed the behavior of strings.
Yes, I know I can figure out how to change my code to use byte arrays
somehow or another, but it is a lot of work.  More than just "sed 
's/string/bytes/'"

Anyway, seg faulting is not a good response.

(gdb) printf "%s\n", pDE->de_val.dvu_text
This program reads or accepts a list of files and prints the names of the
files that are not plain text.  @i{plain text} characters are characters
in the range of 0x20 thru 0x7E (' ' thru '~'), plus backspace,
whitespace characters and the character 0xA9 (© - the circled-C copyright
character).
(gdb) s
Backtrace:
In ice-9/boot-9.scm:
 149: 5 [catch #t #<catch-closure 9b5860> ...]
 157: 4 [#<procedure 9510f0 ()>]
In unknown file:
   ?: 3 [catch-closure]
In ice-9/eval.scm:
 368: 2 [eval # ()]
 368: 1 [eval # ()]
In unknown file:
   ?: 0 [stack "explain"]

ERROR: In procedure stack:
ERROR: Throw to key `decoding-error' with args `("scm_from_stringn" "input 
locale conversion error" 84 \
#vu8(84 104 105 115 32 112 114 111 103 114 97 109 32 114 101 97 100 115 32 111 
114 32 97 99 99 101 112 \
116 115 32 97 32 108 105 115 116 32 111 102 32 102 105 108 101 115 32 97 110 
100 32 112 114 105 110 \
116 115 32 116 104 101 32 110 97 109 101 115 32 111 102 32 116 104 101 10 102 
105 108 101 115 32 116 \
104 97 116 32 97 114 101 32 110 111 116 32 112 108 97 105 110 32 116 101 120 
116 46 32 32 64 105 123 \
112 108 97 105 110 32 116 101 120 116 125 32 99 104 97 114 97 99 116 101 114 
115 32 97 114 101 32 99 \
104 97 114 97 99 116 101 114 115 10 105 110 32 116 104 101 32 114 97 110 103 
101 32 111 102 32 48 \
120 50 48 32 116 104 114 117 32 48 120 55 69 32 40 39 32 39 32 116 104 114 117 
32 39 126 39 41 44 \
32 112 108 117 115 32 98 97 99 107 115 112 97 99 101 44 10 119 104 105 116 101 
115 112 97 99 101 32 \
99 104 97 114 97 99 116 101 114 115 32 97 110 100 32 116 104 101 32 99 104 97 
114 97 99 116 101 114 \
32 48 120 65 57 32 40 169 32 45 32 116 104 101 32 99 105 114 99 108 101 100 45 
67 32 99 111 112 121 \
114 105 103 104 116 10 99 104 97 114 97 99 116 101 114 41 46))'.

Program received signal SIGSEGV, Segmentation fault.