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The C99 \[[ISO/IEC 9899:1999|AA. References#ISOBibliography#ISO/IEC 9899-1999]\] function {{strtok()}} is a string tokenization function that takes two arguments: an initial string to be parsed and a const-qualified character delimiter. It returns a pointer to the first character of a token, or a null pointer if there is no token.

To quote the Linux Programmer's Manual (man) page on {{strtok(3)}} \[[Linux 08|AA. References#LinuxBibliography#Linux 08]\]:
<blockquote><p>Never use this function. This function modifies its first argument. The identity of the delimiting character is lost. This function cannot be used on constant strings.</p></blockquote>The improper use of {{strtok()}} is likely to result in truncated data, producing unexpected results later in program execution.

\[[ISO/IEC 9899:1999|AA. References#ISOBibliography#ISO/IEC 9899-1999]\] Section 7.21.5.8, "The {{strtok}} function"
\[[Linux 08|AA. References#LinuxBibliography#Linux 08]\] [strtok(3)|http://www.kernel.org/doc/man-pages/online/pages/man3/strtok.3.html]
\[[MITRE 07|AA. References#MITREBibliography#MITRE 07]\] [CWE ID 464|http://cwe.mitre.org/data/definitions/464.html], "Addition of Data Structure Sentinel"