Question about Lex

[Ger Timmens]

This is what I do:

1. lex lexcommands         /* ==> lex.yy.c */
2. cc lex.yy.c             /* ==> a.out    */
3. a.out < input > output  /* ==> output   */

I've got the following problem:
When I encounter a string in the file *input* I want to
generate an error message reporting the line number and
file.
However I cannot include the following in my *lexcommands* file:

"string"       fprintf(stderr,"Found *string* on line %d in %s.\n",
                       __LINE__,__FILE__);

since this would report the line number in the file *lex.yy.c* !

Is there a solution to this problem ?
I've experimented with #line, but I did not succeed.

Thanks in advance,

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=     Ger Timmens,  Fysisch Elektronisch Laboratorium TNO     =
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