stpcpy(3) - NetBSD Manual Pages

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STRCPY(3)               NetBSD Library Functions Manual              STRCPY(3)

stpcpy, strcpy -- copy strings
Standard C Library (libc, -lc)
#include <string.h> char * stpcpy(char * restrict dst, const char * restrict src); char * strcpy(char * restrict dst, const char * restrict src);
The stpcpy() and strcpy() functions copy the string src to dst, including the terminating NUL byte. The strings src and dst may not overlap. The string src must be termi- nated by a NUL byte. The memory for dst must have space for strlen(src) + 1 bytes.
The strcpy() function returns dst. The stpcpy() function returns a pointer to the terminating NUL byte of dst.
bcopy(3), memccpy(3), memcpy(3), memmove(3), strlcpy(3), strncpy(3), wcscpy(3)
The strcpy() function conforms to ISO/IEC 9899:1999 (``ISO C99''). The stpcpy() function conforms to IEEE Std 1003.1-2008 (``POSIX.1'').
The stpcpy() function first appeared in NetBSD 6.0.
The strcpy() and stpcpy() functions copy until a NUL terminator without any bounds checks on the size of the input or output buffers. If the input buffer is missing a NUL terminator, or the input string is longer than the output buffer, this can lead to crashes or security vulnerabili- ties from buffer overruns, including disclosure of secrets in memory and arbitrary code execution. The strlcpy(3) function is a safer replacement for strcpy() which allows the caller to specify the space allocated for dst. strlcpy(3), or snprintf(3) with a format string of "%s", should be used instead of strcpy() and stpcpy() wherever possible to avoid buffer overruns in dst. (However, they still require src to be NUL-terminated.) NetBSD 10.99 August 11, 2023 NetBSD 10.99
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