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According to Section 7.19.7.7 of C99 \[[ISO/IEC 9899:1999|AA. C++ References#ISO/IEC 9899-1999]\], the {{gets()}} function reads characters from the {{stdin}} into a destination array until end-of-file is encountered or a new-line character is read.  Any new-line character is discarded, and a null character is written immediately after the last character read into the array.

According to TR 24731 \[[ISO/IEC TR 24731-2006|AA. C++ References#ISO/IEC TR 24731-2006]\]:
<blockquote><p>No additional characters are read after a new-line character (which is discarded) or after end-of-file. The discarded new-line character does not count towards number of characters read. A null character is written immediately after the last character read into the array.</p></blockquote>If end-of-file is encountered and no characters have been read into the destination array, or if a read error occurs during the operation, then the first character in the destination array is set to the null character and the other elements of the array take unspecified values.

\[[Drepper 06|AA. C++ References#Drepper 06]\] Section 2.1.1, "Respecting Memory Bounds"
\[[ISO/IEC 14882-2003|AA. C++ References#ISO/IEC 14882-2003]\] Sections 3.6.1 Main function, and 18.7 Other runtime support
\[[ISO/IEC 9899:1999|AA. C++ References#ISO/IEC 9899-1999]\] Section 7.19, "Input/output <{{stdio.h}}>"
\[[ISO/IEC TR 24731-2006|AA. C++ References#ISO/IEC TR 24731-2006]\] Section 6.5.4.1, "The {{gets_s}} function"
\[[Lai 06|AA. C++ References#Lai 06]\]
\[[MITRE 07|AA. C++ References#MITRE 07]\] [CWE ID 120|http://cwe.mitre.org/data/definitions/120.html], "Unbounded Transfer ('Classic Buffer Overflow')"
\[[NIST 06|AA. C++ References#NIST 06]\] SAMATE Reference Dataset Test Case ID 000-000-088
\[[Seacord 05a|AA. C++ References#Seacord 05]\] Chapter 2, "Strings"