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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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STRCPY(3P) POSIX Programmer's Manual STRCPY(3P)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior), or
the interface may not be implemented on Linux.
stpcpy, strcpy — copy a string and return a pointer to the end of
the result
#include <string.h>
char *stpcpy(char *restrict s1, const char *restrict s2);
char *strcpy(char *restrict s1, const char *restrict s2);
For strcpy(): The functionality described on this reference page
is aligned with the ISO C standard. Any conflict between the
requirements described here and the ISO C standard is
unintentional. This volume of POSIX.1‐2017 defers to the ISO C
standard.
The stpcpy() and strcpy() functions shall copy the string pointed
to by s2 (including the terminating NUL character) into the array
pointed to by s1.
If copying takes place between objects that overlap, the behavior
is undefined.
The stpcpy() function shall return a pointer to the terminating
NUL character copied into the s1 buffer.
The strcpy() function shall return s1.
No return values are reserved to indicate an error.
No errors are defined.
The following sections are informative.
Construction of a Multi-Part Message in a Single Buffer
#include <string.h>
#include <stdio.h>
int
main (void)
{
char buffer [10];
char *name = buffer;
name = stpcpy (stpcpy (stpcpy (name, "ice"),"-"), "cream");
puts (buffer);
return 0;
}
Initializing a String
The following example copies the string "----------" into the
permstring variable.
#include <string.h>
...
static char permstring[11];
...
strcpy(permstring, "----------");
...
Storing a Key and Data
The following example allocates space for a key using malloc()
then uses strcpy() to place the key there. Then it allocates space
for data using malloc(), and uses strcpy() to place data there.
(The user-defined function dbfree() frees memory previously
allocated to an array of type struct element *.)
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
...
/* Structure used to read data and store it. */
struct element {
char *key;
char *data;
};
struct element *tbl, *curtbl;
char *key, *data;
int count;
...
void dbfree(struct element *, int);
...
if ((curtbl->key = malloc(strlen(key) + 1)) == NULL) {
perror("malloc"); dbfree(tbl, count); return NULL;
}
strcpy(curtbl->key, key);
if ((curtbl->data = malloc(strlen(data) + 1)) == NULL) {
perror("malloc"); free(curtbl->key); dbfree(tbl, count); return NULL;
}
strcpy(curtbl->data, data);
...
Character movement is performed differently in different
implementations. Thus, overlapping moves may yield surprises.
This version is aligned with the ISO C standard; this does not
affect compatibility with XPG3 applications. Reliable error
detection by this function was never guaranteed.
None.
None.
strncpy(3p), wcscpy(3p)
The Base Definitions volume of POSIX.1‐2017, string.h(0p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 by the Institute of Electrical and Electronics Engineers,
Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard,
the original IEEE and The Open Group Standard is the referee
document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
Any typographical or formatting errors that appear in this page
are most likely to have been introduced during the conversion of
the source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2017 STRCPY(3P)
Pages that refer to this page: string.h(0p), localeconv(3p), stpcpy(3p), strncpy(3p), wcscpy(3p)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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