SEI CERT C Coding Standard

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Comment: Edited by sciSpider v2.1 (sch jbop) (X_X)@==(Q_Q)@

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Do not modify the value returned by the {{getenv()}} function. Create a copy and make your changes locally, so that they are not overwritten.  According to C99 \[[ISO/IEC 9899-:1999|AA. C References#ISO/IEC 9899-1999]\]:

The getenv function returns a pointer to a string associated with the matched list member. The string pointed to shall not be modified by the program, but may be overwritten by a subsequent call to the getenv function. If the specified name cannot be found, a NULL null pointer is returned.

Non-Compliant Code Example

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Wiki Markup
\[[ISO/IEC 9899-:1999|AA. C References#ISO/IEC 9899-1999]\] Section 7.20.4.5, "The {{getenv}} function"
\[[Open Group 04|AA. C References#Open Group 04]\] [getenv|http://www.opengroup.org/onlinepubs/000095399/functions/getenv.html]

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