YY_INPUT causes crash

[James Hughes]

Hello,

I have been learning how to use flex, and had some success with
it early on, but then put it aside. When picking it up again, I found
I had some compile problems with the app I was working on, and decided
to go back to first principles.
The problem is, every simple example I try crashes as soon as I hit the
enter key. For instance, the following flex file:

%{
#include <stdio.h>
%}

%%
stop    printf("Stop command received\n");
start   printf("Start command received\n");
%%

With gdb, I've traced the problem to the YY_INPUT macro,
specifically the call to getc(yyin). I have tried replacing
getc with both fread() and fgetc(): same results. Same results
with other simple 'hello world' examples, including the "num_lines,
num_chars example" from the flex manual.

I compile with

address@hidden:~/dev/flex$ flex manex1.ll
address@hidden:~/dev/flex$ gcc -o manex1 lex.yy.c -lfl

Thanks for any help.
James

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