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plsesc: Set the escape character for text strings
for Fortran 77
Set the escape character for text strings. From Fortran 77 it needs to be the decimal ASCII value. Only selected characters are allowed to prevent the user from shooting himself in the foot (For example, a "\" isn't allowed since it conflicts with C's use of backslash as a character escape). Here are the allowed escape characters and their corresponding decimal ASCII values:
"!", ASCII 33
"#", ASCII 35
"$", ASCII 36
"%", ASCII 37
"&", ASCII 38
"*", ASCII 42
"@", ASCII 64
"^", ASCII 94
"~", ASCII 126
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