c trimming newline character when reading input from file

Is this a safe way to trim the newline character off of a line after reading it in from a file? while ( fgets(buffer, 1024, fp) != NULL ) { buffer[strlen(buffer)-1] = '\0'; fprintf (stderr, "%s\n", buffer); } It doesn't give me any seg faults but could it cause problems down the road? Should I do something like this instead? while ( fgets(buffer, 1024, fp) != NULL ) { tmp = (char *) malloc(strlen(buffer)); strncpy(tmp, buffer, strlen(buffer) - 1); tmp[strlen(buffer)-1] = '\0'; fprintf (stderr, "%s\n", tmp); }
No need to allocate another buffer, especially using malloc() which is relatively expensive. Using a second buffer does not change the problem.

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