cstdio

Standard library header <cstdio>

This header was originally in the C standard library as <stdio.h>.

This header is part of the C-style input/output library.

Types

FILE	type, capable of holding all information needed to control a C I/O stream
fpos_t	type, capable of uniquely specifying a position in a file
size_t	unsigned integer type returned by the sizeof operator (typedef)

Macros

NULL	implementation-defined null pointer constant (macro constant)
stdinstdoutstderr	expression of type FILE* associated with the input streamexpression of type FILE* associated with the output streamexpression of type FILE* associated with the error output stream (macro constant)
EOF	integer constant expression of type int and negative value (macro constant)
FOPEN_MAX	number of files that can be open simultaneously (macro constant)
FILENAME_MAX	size needed for an array of char to hold the longest supported file name (macro constant)
BUFSIZ	size of the buffer used by std::setbuf (macro constant)
_IOFBF_IOLBF_IONBF	argument to std::setbuf indicating fully buffered I/Oargument to std::setbuf indicating line buffered I/Oargument to std::setbuf indicating unbuffered I/O (macro constant)
SEEK_SETSEEK_CURSEEK_END	argument to std::fseek indicating seeking from beginning of the fileargument to std::fseek indicating seeking from the current file positionargument to std::fseek indicating seeking from end of the file (macro constant)
TMP_MAX	maximum number of unique filenames that can be generated by std::tmpnam (macro constant)
L_tmpnam	size needed for an array of char to hold the result of std::tmpnam (macro constant)

Functions

| File access |

|:----|

| fopen | opens a file (function) |

| freopen | open an existing stream with a different name (function) |

| fclose | closes a file (function) |

| fflush | synchronizes an output stream with the actual file (function) |

| setbuf | sets the buffer for a file stream (function) |

| setvbuf | sets the buffer and its size for a file stream (function) |

| Direct input/output |

| fread | reads from a file (function) |

| fwrite | writes to a file (function) |

| Unformatted input/output |

| Narrow character |

| fgetcgetc | gets a character from a file stream (function) |

| fgets | gets a character string from a file stream (function) |

| fputcputc | writes a character to a file stream (function) |

| fputs | writes a character string to a file stream (function) |

| getchar | reads a character from stdin (function) |

| gets (until C++14) | reads a character string from stdin (function) |

| putchar | writes a character to stdout (function) |

| puts | writes a character string to stdout (function) |

| ungetc | puts a character back into a file stream (function) |

| Formatted input/output |

| Narrow/multibyte character |

| scanffscanfsscanf | reads formatted input from stdin, a file stream or a buffer (function) |

| vscanfvfscanfvsscanf (C++11)(C++11)(C++11) | reads formatted input from stdin, a file stream or a buffer using variable argument list (function) |

| printffprintfsprintfsnprintf (C++11) | prints formatted output to stdout, a file stream or a buffer (function) |

| vprintfvfprintfvsprintfvsnprintf (C++11) | prints formatted output to stdout, a file stream or a buffer using variable argument list (function) |

| File positioning |

| ftell | returns the current file position indicator (function) |

| fgetpos | gets the file position indicator (function) |

| fseek | moves the file position indicator to a specific location in a file (function) |

| fsetpos | moves the file position indicator to a specific location in a file (function) |

| rewind | moves the file position indicator to the beginning in a file (function) |

| Error handling |

| clearerr | clears errors (function) |

| feof | checks for the end-of-file (function) |

| ferror | checks for a file error (function) |

| perror | displays a character string corresponding of the current error to stderr (function) |

| Operations on files |

| remove | erases a file (function) |

| rename | renames a file (function) |

| tmpfile | creates and opens a temporary, auto-removing file (function) |

| tmpnam | returns a unique filename (function) |

Notes

NULL is also defined in the following headers:

Synopsis

namespace std {
  using size_t = /* see definition */;
  using FILE = /* see definition */ ;
  using fpos_t = /* see definition */ ;
}
 
#define NULL /* see definition */
#define _IOFBF /* see definition */
#define _IOLBF /* see definition */
#define _IONBF /* see definition */
#define BUFSIZ /* see definition */
#define EOF /* see definition */
#define FOPEN_MAX /* see definition */
#define FILENAME_MAX /* see definition */
#define L_tmpnam /* see definition */
#define SEEK_CUR /* see definition */
#define SEEK_END /* see definition */
#define SEEK_SET /* see definition */
#define TMP_MAX /* see definition */
#define stderr /* see definition */
#define stdin /* see definition */
#define stdout /* see definition */
 
namespace std {
  int remove(const char* filename
  int rename(const char* old, const char* new
  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
}

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