SEI CERT C Coding Standard

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Code Block
bgColor#ccccff
langc
unsigned int ui1;
unsigned int ui2;
unsigned int uresult;

/* Initialize ui1 and ui2 */

if (ui2 >= sizeof(unsigned int)*CHAR_BIT) {
  /* handleHandle error condition */
} else {
  uresult = ui1 << ui2;
}

...

Code Block
bgColorccccff
langc
unsigned int ui1;
unsigned int ui2;
unsigned int uresult;

/* Initialize ui1 and ui2 */

if (ui2 >= sizeof(unsigned int) * CHAR_BIT) {
  /* handleHandle error condition */
}
else {
  uresult = ui1 >> ui2;
}

...

[Dowd 2006]Chapter 6, "C Language Issues"
[ISO/IEC 2003]Section 6.5.7, "Bitwise Shift Operators"
[Seacord 2005a2013]Chapter 5, "IntegersInteger Security"
[Viega 2005]Section 5.2.7, "Integer Overflow"

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