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The standard {{strncpy()}} function does not guarantee that the resulting string is null terminated \[[ISO/IEC 9899:1999|AA. C References#ISO/IEC 9899-1999]\]. If there is no null character in the first {{n}} characters of the {{source}} array, the result may not be null terminated. |
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The {{strncpy_s()}} function copies up to {{n}} characters from the source array to a destination array \[[TR 24731|AA. C References#ISO/IEC TR 24731-1-2007]\]. If no null character was copied from the source array, then the {{n{}}}th position in the destination array is set to a null character, guaranteeing that the resulting string is null-terminated. |
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\[[ISO/IEC 9899:1999|AA. C References#ISO/IEC 9899-1999]\] Section 7.21, "String handling <string.h>" \[[ISO/IEC PDTR 24772|AA. C References#ISO/IEC PDTR 24772]\] "CJM String Termination" \[[ISO/IEC TR 24731-1:2007|AA. C References#ISO/IEC TR 24731-1-2007]\] Section 6.7.1.4, "The strncpy_s function" |
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