std::strncpy - cppreference.com

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Definido no cabeçalho `<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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Parâmetros

dest	-	ponteiro para a matriz de caracteres para copiar Original: pointer to the character array to copy to The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
src	-	ponteiro para o byte string para copiar Original: pointer to the byte string to copy from The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
count	-	número máximo de caracteres a serem copiados Original: maximum number of characters to copy The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Valor de retorno

dest

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';
}

Saída:

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

Veja também


strcpy	copia uma string para outra Original: copies one string to another The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função) [edit]

memcpy	copia um buffer para outro Original: copies one buffer to another The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função) [edit]

Documentação C para strncpy