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This time, the compiler complains about the mismatched types and helpfully tells us where I can find the problems The program still compiles, but I can use the -Werror option to convert the warning to a hard error that terminates compilation: $ gcc printmec -o printme -Wformat -Werror cc1: warnings being treated as errors printmec: In function 'main': printmec:9: warning: int format, long int arg (arg 2) printmec:10: warning: format argument is not a pointer (arg 2) This time, compilation stops after the errors are detected Once I fix the mismatches, the program compiles and runs properly Listing 1-2 shows the corrected program Listing 1-2 Printmec After Corrections #include <stdioh> #include <limitsh> int main (void) { unsigned long ul = LONG_MAX; short int si = SHRT_MIN; printf ("%ld\n", ul); printf ("%d\n", si); return 0; } $ gcc printme.

ALTER TABLE was used to make modifications to an existing table. The first line of code designated the table to have the column added to:

The second line of code defined the new column and data type: ADD Latest_EducationTypeID int NULL When adding columns to a table that already has data in it, you will be required to add the column with NULL values allowed. You can t specify that the column be NOT NULL, because you must first add the column to the table before you can put a value in that column for existing rows.

c -o printme -Wformat -Werror $ /printme 2147483647 -32768 $ Much better, yes For more control over GCC s format checking, you can use the options -Wno-format-y2k, -Wno-format-extra-args, and -Wformat-security (only -Wformat is included in the -Wall roll-up option) By default, if you supply more arguments than are supported by the available format strings, the C standard says that the extra arguments are ignored GCC accordingly ignores the extra arguments unless you specify -Wformat If you want to use -Wformat and ignore extra arguments, specify -Wno-format-extra-args The -Wformat-security option is quite interesting Format string exploits have become popular in the world of blackhats in the past few years Specifying -Wformat and -Wformat-security displays warnings about format functions that represent potential security breaches.

In addition to adding new columns to a table, you can also use ALTER TABLE to modify an existing column s definition. The syntax for doing this is as follows: ALTER TABLE table_name ALTER COLUMN column_name [type_name] [NULL | NOT NULL] [COLLATE collation_name] Table 4-4 details the arguments of this command. Table 4-4. ALTER TABLE...ALTER COLUMN Arguments

The current implementation covers printf() and scanf() calls in which the format string is not a string literal and in which there are no format arguments, such as printf (var); Such code is problematic if the format string comes from untrusted input and contains %n, which causes printf() to write to system memory Recall that the conversion specifier %n causes the number of characters written to be stored in the int pointer (int * or a variant thereof) it is this memory write that creates the security issue The options that fall under the -Wunused category (see Table A-7 in Appendix A for a complete list) are particularly helpful In optimization passes, gcc does a good job of optimizing away unused objects, but if you disable optimization, the unused cruft bloats the code More generally, unused.

The table name containing the column to be modified. The name of the column to modify. The column s data type to modify. The nullability option to modify. The column collation (for character-based data types) to modify. Collations define three settings: a code page used to store non-Unicode character data types, the sort order for non-Unicode character data types, and the sort order for Unicode data types. Collations are reviewed later on in the chapter.