Page Information

Title:	STR34-C. Cast characters to unsigned char before converting to larger integer sizes
Author:	Robert Seacord	Sep 26, 2007
Last Changed by:	David Svoboda	Jun 05, 2025
Tiny Link: (useful for email)	https://wiki.sei.cmu.edu/confluence/x/BdYxBQ
Export As:	Word · PDF

SEI CERT C Coding Standard (2)     Page: FIO34-C. Distinguish between characters read from a file and EOF or WEOF     Page: STR37-C. Arguments to character-handling functions must be representable as an unsigned char

Android (1)     Page: Unknown Applicability (C Rules/Recomendations)

Parent Page     Page: Rule 07. Characters and Strings (STR)

• ldra
• fortify
• compass/rose
• sample
• android-applicable
• ptc
• android-unknown
• cwe-704
• rose-complete
• rule
• str
• in-cpp

Time	Editor
Jun 05, 2025 14:26	David Svoboda	View Changes
exception
May 06, 2025 10:39	David Svoboda	View Changes
May 05, 2025 08:51	Swasti Shrivastava	View Changes
REM Cost Reform
Dec 12, 2024 00:46	Swasti Shrivastava	View Changes
Sep 25, 2024 10:36	Swasti Shrivastava

External Links (12)
    cwe.mitre.org/data/definitions/704.html
    gcc.gnu.org/onlinedocs/gcc-3.0.4/gcc_3.html#IDX139
    https://www.mathworks.com/help/bugfinder/ref/certcrulestr34…
    https://wiki.sei.cmu.edu/confluence/pages/viewpage.action?p…
    https://wiki.sei.cmu.edu/confluence/pages/viewpage.action?p…
    web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2009-0887
    www.cert.org/advisories/CA-1996-22.html
    https://wiki.sei.cmu.edu/confluence/pages/viewpage.action?p…
    xorl.wordpress.com/2009/03/26/cve-2009-0887-linux-pam-singe…
    https://www.kb.cert.org/vulnotes/bymetric?searchview&query=…
    https://wiki.sei.cmu.edu/confluence/display/c/Polyspace+Bug…
    cwe.mitre.org/

SEI CERT C Coding Standard (36)     Page: Axivion Bauhaus Suite     Page: INT07-C. Use only explicitly signed or unsigned char type for numeric values     Page: Cppcheck Premium     Page: Coverity     Page: PC-lint Plus     Page: TrustInSoft Analyzer     Page: Polyspace Bug Finder_V     Home page: SEI CERT C Coding Standard     Page: Astrée_V     Page: PC-lint Plus_V     Page: CodeSonar_V     Page: LDRA     Page: TrustInSoft Analyzer_V     Page: AA. Bibliography     Page: Coverity_V     Page: Parasoft     Page: STR04-C. Use plain char for characters in the basic character set     Page: Rose     Page: Klocwork     Page: LDRA_V     Page: ECLAIR     Page: CodeSonar     Page: RuleChecker_V     Page: Cppcheck Premium_V     Page: Axivion Bauhaus Suite_V     Page: STR37-C. Arguments to character-handling functions must be representable as an unsigned char     Page: Astrée     Page: Helix QAC     Page: ARR30-C. Do not form or use out-of-bounds pointers or array subscripts     Page: GCC     Page: RuleChecker     Page: Helix QAC_V     Page: BB. Definitions     Page: ECLAIR_V     Page: Klocwork_V     Page: Parasoft_V