31 Input/output library [input.output]

31.13 C library files [c.files]

31.13.1 Header <cstdio> synopsis [cstdio.syn]

#define __STDC_VERSION_STDIO_H__ 202311L namespace std { using size_t = see [support.types.layout]; using FILE = see below; using fpos_t = see below; } #define NULL see [support.types.nullptr] #define _IOFBF see below #define _IOLBF see below #define _IONBF see below #define BUFSIZ see below #define EOF see below #define FOPEN_MAX see below #define FILENAME_MAX see below #define _PRINTF_NAN_LEN_MAX see below #define L_tmpnam see below #define SEEK_CUR see below #define SEEK_END see below #define SEEK_SET see below #define TMP_MAX see below #define stderr see below #define stdin see below #define stdout see below namespace std { int remove(const char* filename); int rename(const char* old_p, const char* new_p); FILE* tmpfile(); char* tmpnam(char* s); int fclose(FILE* stream); int fflush(FILE* stream); FILE* fopen(const char* filename, const char* mode); FILE* freopen(const char* filename, const char* mode, FILE* stream); void setbuf(FILE* stream, char* buf); int setvbuf(FILE* stream, char* buf, int mode, size_t size); int fprintf(FILE* stream, const char* format, ...); int fscanf(FILE* stream, const char* format, ...); int printf(const char* format, ...); int scanf(const char* format, ...); int snprintf(char* s, size_t n, const char* format, ...); int sprintf(char* s, const char* format, ...); int sscanf(const char* s, const char* format, ...); int vfprintf(FILE* stream, const char* format, va_list arg); int vfscanf(FILE* stream, const char* format, va_list arg); int vprintf(const char* format, va_list arg); int vscanf(const char* format, va_list arg); int vsnprintf(char* s, size_t n, const char* format, va_list arg); int vsprintf(char* s, const char* format, va_list arg); int vsscanf(const char* s, const char* format, va_list arg); int fgetc(FILE* stream); char* fgets(char* s, int n, FILE* stream); int fputc(int c, FILE* stream); int fputs(const char* s, FILE* stream); int getc(FILE* stream); int getchar(); int putc(int c, FILE* stream); int putchar(int c); int puts(const char* s); int ungetc(int c, FILE* stream); size_t fread(void* ptr, size_t size, size_t nmemb, FILE* stream); size_t fwrite(const void* ptr, size_t size, size_t nmemb, FILE* stream); int fgetpos(FILE* stream, fpos_t* pos); int fseek(FILE* stream, long int offset, int whence); int fsetpos(FILE* stream, const fpos_t* pos); long int ftell(FILE* stream); void rewind(FILE* stream); void clearerr(FILE* stream); int feof(FILE* stream); int ferror(FILE* stream); void perror(const char* s); }

The contents and meaning of the header <cstdio> are the same as the C standard library header <stdio.h>.

The return from each function call that delivers data to the host environment to be written to a file (See also: ISO/IEC 9899:2024, 7.21.3) is an observable checkpoint ([intro.abstract]).

Calls to the function tmpnam with an argument that is a null pointer value may introduce a data race ([res.on.data.races]) with other calls to tmpnam with an argument that is a null pointer value.

31.13.2 Header <cinttypes> synopsis [cinttypes.syn]

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#include <cstdint> // see [cstdint.syn] namespace std { using imaxdiv_t = see below; constexpr intmax_t imaxabs(intmax_t j); constexpr imaxdiv_t imaxdiv(intmax_t numer, intmax_t denom); intmax_t strtoimax(const char* nptr, char** endptr, int base); uintmax_t strtoumax(const char* nptr, char** endptr, int base); intmax_t wcstoimax(const wchar_t* nptr, wchar_t** endptr, int base); uintmax_t wcstoumax(const wchar_t* nptr, wchar_t** endptr, int base); constexpr intmax_t abs(intmax_t); // optional, see below constexpr imaxdiv_t div(intmax_t, intmax_t); // optional, see below } #define __STDC_VERSION_INTTYPES_H__ 202311L #define PRIdN see below #define PRIiN see below #define PRIoN see below #define PRIuN see below #define PRIxN see below #define PRIXN see below #define PRIbN see below #define PRIBN see below #define SCNdN see below #define SCNiN see below #define SCNoN see below #define SCNuN see below #define SCNxN see below #define SCNbN see below #define PRIdLEASTN see below #define PRIiLEASTN see below #define PRIoLEASTN see below #define PRIuLEASTN see below #define PRIxLEASTN see below #define PRIXLEASTN see below #define PRIbLEASTN see below #define PRIBLEASTN see below #define SCNdLEASTN see below #define SCNiLEASTN see below #define SCNoLEASTN see below #define SCNuLEASTN see below #define SCNxLEASTN see below #define SCNbLEASTN see below #define PRIdFASTN see below #define PRIiFASTN see below #define PRIoFASTN see below #define PRIuFASTN see below #define PRIxFASTN see below #define PRIXFASTN see below #define PRIbFASTN see below #define PRIBFASTN see below #define SCNdFASTN see below #define SCNiFASTN see below #define SCNoFASTN see below #define SCNuFASTN see below #define SCNxFASTN see below #define SCNbFASTN see below #define PRIdMAX see below #define PRIiMAX see below #define PRIoMAX see below #define PRIuMAX see below #define PRIxMAX see below #define PRIXMAX see below #define PRIbMAX see below #define PRIBMAX see below #define SCNdMAX see below #define SCNiMAX see below #define SCNoMAX see below #define SCNuMAX see below #define SCNxMAX see below #define SCNbMAX see below #define PRIdPTR see below #define PRIiPTR see below #define PRIoPTR see below #define PRIuPTR see below #define PRIxPTR see below #define PRIXPTR see below #define PRIbPTR see below #define PRIBPTR see below #define SCNdPTR see below #define SCNiPTR see below #define SCNoPTR see below #define SCNuPTR see below #define SCNxPTR see below #define SCNbPTR see below

The contents and meaning of the header <cinttypes> are the same as the C standard library header <inttypes.h>, with the following changes:

(1.1)
The header <cinttypes> includes the header <cstdint> instead of <stdint.h>, and
(1.2)
if and only if the type intmax_t designates an extended integer type ([basic.fundamental]), the following function signatures are added: constexpr intmax_t abs(intmax_t); constexpr imaxdiv_t div(intmax_t, intmax_t); which shall have the same semantics as the function signatures constexpr intmax_t imaxabs(intmax_t) and constexpr imaxdiv_t imaxdiv(intmax_t, intmax_t), respectively.