Getting file extension in C language -

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Say that the file is named 12345.jpg. In C, how can I get the file extension so that I can compare it to some file extensions? If there is any inbuilt functions, please let me know.

A function to do this, together with a test harness: 

 < Code> #include & lt; Stdio.h & gt; #include & lt; String.h & gt; Const char * getExt (const char * fspec) {char * e = strrchr (fspec, '.'); If (E == faucet) E = ""; // fast method, can use more (FSPEC [Stellen (FSPEC)]). Return e; } Int main (int argc, char * argv []) {int i; For (i = 1; i & lt; argc; i ++) {printf ("[% s] -> [% s] \ n", argv [i], getExt (argv [i])); } Return 0; }

is running with: 

  ./program abc abc. Abc.1 .xyz abc.def abc.def.ghi

gives you: 

  [abc] - & gt; [] [ABC.] - & gt; [.] [ABC.1] - & gt; [.1] [.xyz] - & gt; [.xyz] [abc.def] - & gt; [.def] [abc.def.ghi] - & gt; [.ghi]

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