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strcpy(3) Library Functions Manual strcpy(3)
NAME
stpcpy, strcpy, strcat - copy or catenate a string
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);
char *strcat(char *restrict dst, const char *restrict src);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
stpcpy():
Since glibc 2.10:
_POSIX_C_SOURCE >= 200809L
Before glibc 2.10:
_GNU_SOURCE
DESCRIPTION
stpcpy()
strcpy()
These functions copy the string pointed to by src, into a string
at the buffer pointed to by dst. The programmer is responsible
for allocating a destination buffer large enough, that is,
strlen(src) + 1. For the difference between the two functions,
see RETURN VALUE.
strcat()
This function catenates the string pointed to by src, after the
string pointed to by dst (overwriting its terminating null
byte). The programmer is responsible for allocating a destina-
tion buffer large enough, that is, strlen(dst) + strlen(src) +
1.
An implementation of these functions might be:
char *
stpcpy(char *restrict dst, const char *restrict src)
{
char *p;
p = mempcpy(dst, src, strlen(src));
*p = '\0';
return p;
}
char *
strcpy(char *restrict dst, const char *restrict src)
{
stpcpy(dst, src);
return dst;
}
char *
strcat(char *restrict dst, const char *restrict src)
{
stpcpy(dst + strlen(dst), src);
return dst;
}
RETURN VALUE
stpcpy()
This function returns a pointer to the terminating null byte of
the copied string.
strcpy()
strcat()
These functions return dst.
ATTRIBUTES
For an explanation of the terms used in this section, see at-
tributes(7).
+--------------------------------------------+---------------+---------+
|Interface | Attribute | Value |
+--------------------------------------------+---------------+---------+
|stpcpy(), strcpy(), strcat() | Thread safety | MT-Safe |
+--------------------------------------------+---------------+---------+
STANDARDS
stpcpy()
POSIX.1-2008.
strcpy()
strcat()
C11, POSIX.1-2008.
STANDARDS
stpcpy()
POSIX.1-2008.
strcpy()
strcat()
POSIX.1-2001, C89, SVr4, 4.3BSD.
CAVEATS
The strings src and dst may not overlap.
If the destination buffer is not large enough, the behavior is unde-
fined. See _FORTIFY_SOURCE in feature_test_macros(7).
strcat() can be very inefficient. Read about Shlemiel thepainter
<https://www.joelonsoftware.com/2001/12/11/back-to-basics/>.
EXAMPLES
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int
main(void)
{
char *p;
char *buf1;
char *buf2;
size_t len, maxsize;
maxsize = strlen("Hello ") + strlen("world") + strlen("!") + 1;
buf1 = malloc(sizeof(*buf1) * maxsize);
if (buf1 == NULL)
err(EXIT_FAILURE, "malloc()");
buf2 = malloc(sizeof(*buf2) * maxsize);
if (buf2 == NULL)
err(EXIT_FAILURE, "malloc()");
p = buf1;
p = stpcpy(p, "Hello ");
p = stpcpy(p, "world");
p = stpcpy(p, "!");
len = p - buf1;
printf("[len = %zu]: ", len);
puts(buf1); // "Hello world!"
free(buf1);
strcpy(buf2, "Hello ");
strcat(buf2, "world");
strcat(buf2, "!");
len = strlen(buf2);
printf("[len = %zu]: ", len);
puts(buf2); // "Hello world!"
free(buf2);
exit(EXIT_SUCCESS);
}
SEE ALSO
strdup(3), string(3), wcscpy(3), string_copying(7)
Linux man-pages 6.04 2023-03-30 strcpy(3)
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