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NAME
strcpy - copy a string
SYNOPSIS
#include <string.h> char *strcpy(char *restrict s1, const char *restrict s2);
DESCRIPTION
The strcpy() function shall copy the string pointed to by s2 (including the terminating null byte) into
the array pointed to by s1. If copying takes place between objects that overlap, the behavior is
undefined.
RETURN VALUE
The strcpy() function shall return s1; no return value is reserved to indicate an error.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
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);
...
APPLICATION USAGE
Character movement is performed differently in different implementations. Thus, overlapping moves may
yield surprises.
This issue is aligned with the ISO C standard; this does not affect compatibility with XPG3 applications.
Reliable error detection by this function was never guaranteed.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
strncpy() , the Base Definitions volume of IEEE Std 1003.1-2001, <string.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition,
Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 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 .