Page Information

Title:	STR37-C. Arguments to character-handling functions must be representable as an unsigned char
Author:	Robert Seacord	Oct 20, 2006
Last Changed by:	Francesco Mariani	Aug 06, 2025
Tiny Link: (useful for email)	https://wiki.sei.cmu.edu/confluence/x/BNcxBQ
Export As:	Word · PDF

SEI CERT C Coding Standard (2)     Page: CC. Undefined Behavior     Page: STR34-C. Cast characters to unsigned char before converting to larger integer sizes

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

• char-strings
• compass/rose
• rose-na-macros
• android-applicable
• ptc
• cwe-704
• cwe-686
• rule
• str
• in-cpp

Time	Editor
Aug 06, 2025 14:03	Francesco Mariani	View Changes
Jul 24, 2025 11:31	Jill Britton	View Changes
May 05, 2025 08:52	Caden Milne	View Changes
REM Cost Reform
Mar 27, 2025 16:24	Caden Milne	View Changes
Identify undefined behavior
Nov 25, 2024 10:51	Caden Milne
Updated UB references from C11->C23

External Links (13)
    cwe.mitre.org/data/definitions/704.html
    https://wiki.sei.cmu.edu/confluence/display/c/Polyspace+Bug…
    https://wiki.sei.cmu.edu/confluence/pages/viewpage.action?p…
    https://www.kb.cert.org/vulnotes/bymetric?searchview&query=…
    https://wiki.sei.cmu.edu/confluence/display/c/SEI+CERT+C+Co…
    https://wiki.sei.cmu.edu/confluence/pages/viewpage.action?p…
    https://wiki.sei.cmu.edu/confluence/display/c/AA.+Bibliogra…
    https://wiki.sei.cmu.edu/confluence/display/c/How+this+Codi…
    https://wiki.sei.cmu.edu/confluence/display/c/STR34-C.+Cast…
    https://wiki.sei.cmu.edu/confluence/pages/viewpage.action?p…
    https://wiki.sei.cmu.edu/confluence/pages/viewpage.action?p…
    https://cwe.mitre.org/data/index.html
    https://www.mathworks.com/help/bugfinder/ref/certcrulestr37…

SEI CERT C Coding Standard (29)     Page: Klocwork_V     Page: STR34-C. Cast characters to unsigned char before converting to larger integer sizes     Page: Axivion Bauhaus Suite     Page: Astrée_V     Home page: SEI CERT C Coding Standard     Page: LDRA     Page: Parasoft_V     Page: TrustInSoft Analyzer     Page: Polyspace Bug Finder_V     Page: CC. Undefined Behavior     Page: ECLAIR_V     Page: Helix QAC     Page: BB. Definitions     Page: RuleChecker     Page: Security Reviewer - Static Reviewer     Page: ECLAIR     Page: LDRA_V     Page: Astrée     Page: TrustInSoft Analyzer_V     Page: Security Reviewer - Static Reviewer_V     Page: Axivion Bauhaus Suite_V     Page: Helix QAC_V     Page: RuleChecker_V     Page: CodeSonar     Page: AA. Bibliography     Page: CodeSonar_V     Page: Klocwork     Page: Rose     Page: Parasoft