using lex with strings, not files

[Will Leavitt]

Thank you for all the suggestions.  I had come up with various kludges using 
freopen, but this is much cleaner:

from: Bradley White <bww+ at K.GP.CS.CMU.EDU>

%%
char *instr;

#undef  input
#define input()         (*instr ? *instr++ : *instr)

#undef  unput
#define unput(c)        ((c), --instr)

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