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Message: [QUOTE="grishin-mailing-lists, post: 4066492"] Thank you, Ben. I've considered all of your suggestions. I spent about an hour to get this invariant while (fgets( buff, sizeof buff, fp ) && !(strstr( buff, cDefinition ) && !( strstr( buff, s_case1 ) || strstr( buff, s_case2_1 ) || strstr( buff, s_case2_2 ) || strstr( buff, s_case3 ) ))) { } but it seems to me as "too much" because it would be difficult to add something (especially after a year or two). I decided to have this one: while (fgets( buff, sizeof buff, fp )) { if (strstr( buff, cDefinition ) && !( strstr( buff, s_case1 ) || strstr( buff, s_case2_1 ) || strstr( buff, s_case2_2 ) || strstr( buff, s_case3 ) )) { break; } } Neat enough and can be easily modified. [/QUOTE]