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32 .\" @(#)strcpy.3 8.1 (Berkeley) 6/4/93
49 .Fn stpcpy "char * restrict dst" "const char * restrict src"
51 .Fn stpncpy "char * restrict dst" "const char * restrict src" "size_t len"
53 .Fn strcpy "char * restrict dst" "const char * restrict src"
55 .Fn strncpy "char * restrict dst" "const char * restrict src" "size_t len"
66 (including the terminating
73 overlap, the results are undefined.
79 functions copy at most
104 overlap, the results are undefined.
117 functions return a pointer to the terminating
127 character, it instead returns a pointer to
129 (which does not necessarily refer to a valid memory location.)
134 .Dq Li abc\e0\e0\e0 :
135 .Bd -literal -offset indent
138 (void)strncpy(chararray, "abc", sizeof(chararray));
145 .Bd -literal -offset indent
148 (void)strncpy(chararray, "abcdefgh", sizeof(chararray));
156 because the length of the source string is greater than or equal
157 to the length argument.
159 The following copies as many characters from
165 terminates the result.
172 terminate the string itself, this must be done explicitly.
173 .Bd -literal -offset indent
176 (void)strncpy(buf, input, sizeof(buf) - 1);
177 buf[sizeof(buf) - 1] = '\e0';
180 This could be better achieved using
182 as shown in the following example:
184 .Dl "(void)strlcpy(buf, input, sizeof(buf));"
188 is not defined in any standards, it should
189 only be used when portability is not a concern.
214 function first appeared in
220 .Sh SECURITY CONSIDERATIONS
223 function is easily misused in a manner which enables malicious users
224 to arbitrarily change a running program's functionality through a
225 buffer overflow attack.