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STRCPY(3)                  Library Functions Manual                  STRCPY(3)

NAME
     stpcpy, strcpy - copy strings

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <string.h>

     char *
     stpcpy(char * restrict dst, const char * restrict src);

     char *
     strcpy(char * restrict dst, const char * restrict src);

DESCRIPTION
     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
     terminated by a NUL byte.  The memory for dst must have space for
     strlen(src) + 1 bytes.

RETURN VALUES
     The strcpy() function returns dst.

     The stpcpy() function returns a pointer to the terminating NUL byte of
     dst.

SEE ALSO
     bcopy(3), memccpy(3), memcpy(3), memmove(3), strlcpy(3), strncpy(3),
     wcscpy(3)

STANDARDS
     The strcpy() function conforms to ISO/IEC 9899:1999 ("ISO C99").

     The stpcpy() function conforms to IEEE Std 1003.1-2008 ("POSIX.1").

HISTORY
     The stpcpy() function first appeared in NetBSD 6.0.

SECURITY CONSIDERATIONS
     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
     vulnerabilities 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