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std::strncpy

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< cpp‎ | string‎ | byte

 
 
Biblioteca cordas
Strings terminadas
Original:
Null-terminated strings
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Cadeias de bytes
Multibyte cordas
Cordas de largura
Classes
Original:
Classes
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basic_string
char_traits
 
Cordas de terminação nula de bytes
Funções
Original:
Functions
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Manipulação personagem
Original:
Character manipulation
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Conversões para formatos numéricos
Original:
Conversions to numeric formats
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Manipulação de cadeia
Original:
String manipulation
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strcpy
strncpy
strcat
strncat
strxfrm
Exame String
Original:
String examination
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Manipulação de memória
Original:
Memory manipulation
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memchr
memcmp
memset
memcpy
memmove
Diversos
Original:
Miscellaneous
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strerror
 
Defined in header <cstring>
char *strncpy( char *dest, const char *src, std::size_t count );
Cópias de personagens mais count da cadeia de bytes apontado por src (incluindo o caractere nulo de terminação) a matriz de caracteres apontada por dest.
Original:
Copies at most count characters of the byte string pointed to by src (including the terminating null character) to character array pointed to by dest.
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Se count for atingido antes da src cadeia inteira foi copiado, a matriz de caracteres resultante não é nulo terminada.
Original:
If count is reached before the entire string src was copied, the resulting character array is not null-terminated.
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Se, depois de copiar o caractere nulo de terminação de src, count não for alcançado, outros caracteres nulos são escritos para dest até que o total de caracteres count ter sido escrita.
Original:
If, after copying the terminating null character from src, count is not reached, additional null characters are written to dest until the total of count characters have been written.
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Se as cordas se sobrepõem, o comportamento é indefinido.
Original:
If the strings overlap, the behavior is undefined.
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Índice

[editar] Parâmetros

dest -
ponteiro para a matriz de caracteres para copiar
Original:
pointer to the character array to copy to
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src -
ponteiro para o byte string para copiar
Original:
pointer to the byte string to copy from
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count -
número máximo de caracteres a serem copiados
Original:
maximum number of characters to copy
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[editar] Valor de retorno

dest

[editar] Exemplo

#include <iostream>
#include <cstring>
 
int main()
{
    const char* src = "hi";
    char dest[6] = {'a', 'b', 'c', 'd', 'e', 'f'};;
    std::strncpy(dest, src, 5);
 
    std::cout << "The contents of dest are: ";
    for (char c : dest) {
        if (c) {
            std::cout << c << ' ';
        } else {
            std::cout << "\\0" << ' ';
        }
    }
    std::cout << '\n';
}

Output:

The contents of dest are: h i \0 \0 \0 f

[editar] Veja também

copia uma string para outra
Original:
copies one string to another
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(função) [edit]
copia um buffer para outro
Original:
copies one buffer to another
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(função) [edit]
C documentation for strncpy