31 Input/output library [input.output]

31.13 C library files [c.files]

31.13.1 Header <cstdio> synopsis [cstdio.syn]

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 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 9899:2018, 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 PRIdN see below #define PRIiN see below #define PRIoN see below #define PRIuN see below #define PRIxN see below #define PRIXN see below #define SCNdN see below #define SCNiN see below #define SCNoN see below #define SCNuN see below #define SCNxN 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 SCNdLEASTN see below #define SCNiLEASTN see below #define SCNoLEASTN see below #define SCNuLEASTN see below #define SCNxLEASTN 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 SCNdFASTN see below #define SCNiFASTN see below #define SCNoFASTN see below #define SCNuFASTN see below #define SCNxFASTN 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 SCNdMAX see below #define SCNiMAX see below #define SCNoMAX see below #define SCNuMAX see below #define SCNxMAX 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 SCNdPTR see below #define SCNiPTR see below #define SCNoPTR see below #define SCNuPTR see below #define SCNxPTR 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)
intmax_t and uintmax_t are not required to be able to represent all values of extended integer types wider than long long and unsigned long long, respectively, and
(1.3)
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.