SEI CERT C Coding Standard

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changes.mady.by.user Masaki Kubo

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This noncompliant code example can result in an error condition on [implementations|BB. Definitions#implementation] in which an arithmetic shift is performed and the sign bit is propagated as the number is shifted \[[Dowd 06|AA. C References#Dowd 06]\].

Code Block
bgColor#FFcccc
int rc = 0;
int stringify = 0x80000000;
char buf[sizeof("256")];
rc = snprintf(buf, sizeof(buf), "%u", stringify >> 24);
if (rc == -1 || rc >= sizeof(buf)) {
  /* handle error */
}

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Wiki Markup
\[[Dowd 06|AA. C References#Dowd 06]\] Chapter 6, "C Language Issues"
\[[ISO/IEC 03|AA. C References#ISO/IEC 03]\] Section 6.5.7, "Bitwise shift operators"
\[[ISO/IEC 9899:1999|AA. C References#ISO/IEC 9899-1999]\] Section 6.5.7, "Bitwise shift operators"
\[[ISO/IEC PDTR 24772|AA. C References#ISO/IEC PDTR 24772]\] "STR Bit Representations," "XYY Wrap-around Error," and "XZI Sign Extension Error"
\[[MITRE 07|AA. C References#MITRE 07]\] [CWE ID 682|http://cwe.mitre.org/data/definitions/682.html], "Incorrect Calculation"

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