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It is not necessary to go beyond the standard C library to find examples that violate this recommendation because the C language often prioritizes performance at the expense of robustness. The following are two examples from the C Standard, Section 7.24 .[ISO/IEC 9899:2011]:

char *strncpy(char * restrict s1, const char * restrict s2, size_t n);
char *strncat(char * restrict s1, const char * restrict s2, size_t n);

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The C Standard, Annex K (normative) Bounds-checking interfaces, defines bounds-checking versions of standard C library string-handling functions.:

errno_t strncpy_s(char * restrict s1, rsize_t s1max, const char * restrict s2, rsize_t n);
errno_t strcat_s(char * restrict s1, rsize_t s1max, const char * restrict s2);

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