http://snippets.dzone.com/posts Mon, 06 Oct 2008 12:48:09 GMT DZone Snippets: c code http://snippets.dzone.com/posts/show/3793 I'm vaguely plotting a finite state machine -> C compiler (as toy code, not for a serious project - I know there are plenty already out there), so thought I'd write a sample one by hand to see how it should look. Here's the code for it. <br /> <br />This checks if stdin contains the phrase 'foo' or 'bar' <br /> <br /><code> <br />#include <stdio.h> <br /> <br />main() <br />{ <br /> int c; <br /> <br /> START: <br /> switch(c = getchar()){ <br /> case 'f' : goto F; <br /> case 'b' : goto B; <br /> case EOF : goto FAIL; <br /> default: goto START; } <br /> <br /> F: <br /> switch(c = getchar()){ <br /> case 'o' : goto FO; <br /> case EOF : goto FAIL; <br /> default : goto START;} <br /> <br /> FO: <br /> switch(c = getchar()){ <br /> case 'o' : goto SUCCESS; <br /> case EOF : goto FAIL; <br /> default : goto START;} <br /> <br /> B: <br /> switch(c = getchar()){ <br /> case 'a' : goto BA; <br /> case EOF : goto FAIL; <br /> default : goto START;} <br /> <br /> BA: <br /> switch(c = getchar()){ <br /> case 'r' : goto SUCCESS; <br /> case EOF : goto FAIL; <br /> default : goto START;} <br /> <br /> FAIL: <br /> printf("Does not match.\n"); <br /> return; <br /> SUCCESS: <br /> printf("Matches.\n"); <br /> return; <br />} <br /> <br /> <br /></code> Tue, 10 Apr 2007 17:28:00 GMT http://snippets.dzone.com/posts/show/3793 DRMacIver (David R. MacIver)