35 lines
1.6 KiB
C
35 lines
1.6 KiB
C
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/*
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** This is curlfish, a program just about as simple as they come.
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** The name comes from an abreviation of, then an expansion of, "CRLF shell"
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** (CRLF SHELL -> crlfsh - > curlfish)
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**
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**
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** In fact, the curlfish program is no more than "Hello World!". The real
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** hack is in filenames (filenames of symbolic links, actually). The actual
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** binary is installed in /bin and you make multiple symlinks to it, named
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** exactly the same as real script interpreters, except followed by a carriage
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** return character. Thus, when a file is created under DOS or Windows, and
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** has CRLF line terminations, the script has a valid interpreter to call via
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** its #! line.
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**
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** For example, A script is created under Windows which should call /bin/ksh,
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** but because it has DOS style line terminations, it actually calls
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** /bin/ksh^M Usually this results in a rather cryptic message indicating
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** that the interpreter does not exist. A casual inspection of the file
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** does not reveal the CRLF terminations, and the user checks that /bin/ksh
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** does indeed exist. If /bin/ksh^M really does exist as a symlink to
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** curlfish, the user is immediately made aware of the true nature of the
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** problem.
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**
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** I have also added a fairly distinctive return code so that if scripts that
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** call curlfish are called by methods other than a direct shell invocation,
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** that fact can be tested for and the error handled gracefully.
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**
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*/
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#include <stdio.h>
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int main (void)
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{
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printf ("\n\nYour script contains DOS-style line endings\nPlease remedy the situation and try again\n\n");
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return 29;
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}
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