Standard library header <string.h>

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このヘッダーは null終端バイト文字列を扱う関数を提供します。

#define __STDC_VERSION_STRING_H__ 202311L
#define NULL /* 説明を参照 */
typedef /* 説明を参照 */ size_t;
void* memcpy(void* restrict s1, const void* restrict s2, size_t n);
void* memccpy(void* restrict s1, const void* restrict s2, int c, size_t n);
void* memmove(void* s1, const void* s2, size_t n);
char* strcpy(char* restrict s1, const char* restrict s2);
char* strncpy(char* restrict s1, const char* restrict s2, size_t n);
char* strdup(const char* s);
char* strndup(const char* s, size_t n);
char* strcat(char* restrict s1, const char* restrict s2);
char* strncat(char* restrict s1, const char* restrict s2, size_t n);
int memcmp(const void* s1, const void* s2, size_t n);
int strcmp(const char* s1, const char* s2);
int strcoll(const char* s1, const char* s2);
int strncmp(const char* s1, const char* s2, size_t n);
size_t strxfrm(char* restrict s1, const char* restrict s2, size_t n);
/*QVoid*/* memchr(/*QVoid*/* s, int c, size_t n);
/*QChar*/* strchr(/*QChar*/* s, int c);
size_t strcspn(const char* s1, const char* s2);
/*QChar*/* strpbrk(/*QChar*/* s1, const char* s2);
/*QChar*/* strrchr(/*QChar*/* s, int c);
size_t strspn(const char* s1, const char* s2);
/*QChar*/* strstr(/*QChar*/* s1, const char* s2);
char* strtok(char* restrict s1, const char* restrict s2);
void* memset(void* s, int c, size_t n);
void* memset_explicit(void* s, int c, size_t n);
char* strerror(int errnum);
size_t strlen(const char* s);
size_t strnlen(const char* s, size_t n);

実装が __STDC_LIB_EXT1__ を定義しており、かつユーザーコードが __STDC_WANT_LIB_EXT1__ を <string.h> のインクルード前に定義している場合のみ：

#ifdef __STDC_WANT_LIB_EXT1__
tyepdef /* 説明を参照 */ errno_t;
tyepdef /* 説明を参照 */ rsize_t;
errno_t memcpy_s(void* restrict s1, rsize_t s1max, const void* restrict s2, rsize_t n);
errno_t memmove_s(void* s1, rsize_t s1max, const void* s2, rsize_t n);
errno_t strcpy_s(char* restrict s1, rsize_t s1max, const char* restrict s2);
errno_t strncpy_s(char* restrict s1, rsize_t s1max, const char* restrict s2, rsize_t n);
errno_t strcat_s(char* restrict s1, rsize_t s1max, const char* restrict s2);
errno_t strncat_s(char* restrict s1, rsize_t s1max, const char* restrict s2, rsize_t n);
char* strtok_s(char* restrict s1, rsize_t* restrict s1max,
               const char* restrict s2, char** restrict ptr);
errno_t memset_s(void* s, rsize_t smax, int c, rsize_t n)
errno_t strerror_s(char* s, rsize_t maxsize, errno_t errnum);
size_t strerrorlen_s(errno_t errnum);
size_t strnlen_s(const char* s, size_t maxsize);
#endif

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Standard library header <string.h>

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