`strcpy.3p` ( 3 )

скопировать строку и вернуть указатель на конец результата (copy a string and return a pointer to the end of the result)

Формат

Пролог (Prolog)

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.

Имя (Name)

stpcpy, strcpy — copy a string and return a pointer to the end of the result

Синопсис (Synopsis)

#include <string.h>

char *stpcpy(char *restrict s1, const char *restrict s2); char *strcpy(char *restrict s1, const char *restrict s2);

Описание (Description)

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.

Возвращаемое значение (Return value)

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.

Ошибки (Error)

No errors are defined.

The following sections are informative.

Примеры (Examples)

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);
           ...

Использование в приложениях (Application usage)

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.

Обоснование (Rationale)

None.

Будущие направления (Future directions)