std::strncpy

 

C++

Язык

Понятия (концепции)

Утилиты

Строки

Контейнеры

Алгоритмы

Итераторы

Работа с числами

Ввод / вывод

Локализация

Регулярные выражения (C++11)

Атомарные примитивы (C++11)

Потоки (C++11)

 

Строки

Нуль-терминальные строки

Однобайтовые строки

Многобайтовые строки

Широкие строки

Классы

basic_string

char_traits

 

Нульзаканчивающихся строк байт

Функции Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Персонаж манипуляции Original: Character manipulation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
isalnum isalpha islower isupper isdigit isxdigit isblank (C++11)	iscntrl isgraph isspace isprint ispunct tolower toupper
Преобразование в цифровой формат Original: Conversions to numeric formats The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
atof atoi atol atoll strtol strtoll	strtoul strtoull strtof strtod strtold
Строками Original: String manipulation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
strcpy
strncpy
strcat
strncat
strxfrm
Струнный экспертизы Original: String examination The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
strlen strcmp strncmp strcoll strchr strrchr	strspn strcspn strpbrk strstr strtok
Память манипуляции Original: Memory manipulation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
memchr
memcmp
memset
memcpy
memmove
Разное Original: Miscellaneous The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
strerror

 

Заголовочный файл <cstring>
char *strncpy( char *dest, const char *src, std::size_t count );

Копии не более count символов байт строки, на которую указывает src (включая завершающий нулевой символ) в массив символов, на которую указывает 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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Если count будет достигнута до того, как весь src строки были скопированы, в результате массив символов не является нулем.

Original:

If count is reached before the entire string src was copied, the resulting character array is not null-terminated.

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Если после копирования завершающий нулевой символ из src, count не достигнута, дополнительные нулевые символы записываются в dest до всего count символы были написаны.

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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Если строки перекрываются, поведение не определено.

Original:

If the strings overlap, the behavior is undefined.

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Параметры

dest	-	Указатель на массив символов для копирования 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	-	Указатель на строку байтов для копирования с 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	-	Максимальное количество символов для копирования 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.

Возвращаемое значение

dest

Пример

#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';
}

Вывод:

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

См. также

strcpy	копирует одну строку в другую 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. (функция)
memcpy	копия одного буфера в другой 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. (функция)
C документация для strncpy