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Flex/Bison parser runs only once

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Hello, i have a little parsing application written using flex and bison. The problem is that the parser itself runs only once! For example: i run the application, select a file to parse, and the application parses it. But when i try immediately after to parse a next file, it does nothing and stops at first line of the file. Is there something i must do before parsing next file? I mean something like yyflush(), yyrestart() or something like that? I use yyparse() function normally. Thanks a lot

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