stdio.h

Overview

Related Modules:

IO

Description:

Declares common functions used for performing input and output (I/O) operations.

You can use the functions provided in this file to perform the I/O operations required during development. Distinguished by I/O targets, there are standard I/O, file stream I/O, and string I/O.

Since:

1.0

Version:

1.0

Summary

Typedefs

Typedef Name

Description

FILE

typedef struct _IO_FILE 

Struct of file stream.

Functions

Function Name

Description

fopen (const char __restrict path, const char restrict mode)

FILE 

Opens the file stored in the specified path based on the given mode.

fclose (FILE fd)

int 

Closes a file based on the specified file descriptor.

remove (const char pathname)

int 

Deletes a specified file or directory from the file system.

rename (const char oldpath, const char newpath)

int 

Renames a specified file.

feof (FILE fp)

int 

Tests the end-of-file indicator for a specified stream.

ferror (FILEstream)

int 

Tests for the error identifier of a specified file stream.

fflush (FILE fp)

int 

Flushes the output buffer of a specified stream.

clearerr (FILEfp)

void 

Resets the error indicators.

fseek (FILE fp, long offset, int whence)

int 

Changes the position of a specified stream to a new position.

ftell (FILEfp)

long 

Obtains the current value of the file position indicator for a specified file stream.

rewind (FILE stream)

void 

Sets the position indicator of a specified stream to the beginning of the file.

fgetpos (FILEstream, fpos_t pos)

int 

Obtains the current file position of a specified stream and writes it to the pos parameter.

fsetpos (FILEfp, const fpos_t pos)

int 

Sets the file position indicator for a specified file stream.

fread (void *restrict ptr, size_t size, size_t nmemb, FILE__restrict stream)

size_t 

Reads data from a specified stream.

fwrite (const void restrict ptr, size_t size, size_t nmemb, FILE *restrict stream)

size_t 

Writes data to a specified stream.

getc (FILEstream)

int 

Reads a character from a specified file stream.

getchar (void)

int 

Obtains the next character from the standard input (stdin).

ungetc (int c, FILE stream)

int 

Pushes a character back into a specified file stream.

fputc (int c, FILEstream)

int 

Writes a character into the position pointed to by a specified stream.

putc (int c, FILE stream)

int 

Writes a character to a specified file stream.

putchar (int c)

int 

Writes a character into the standard output (stdout).

fgets (char s, int size, FILEstream)

char  

Reads a line of characters from a specified file stream and stores it into the string pointed to by s.

gets (char s)

char  

Reads a line of characters from the stdin and stores it in the buffer.

fputs (const char s, FILEstream)

int 

Writes a character string (excluding the terminating null character) to a specified file stream.

puts (const char s)

int 

Writes a character string and appends a new-line character to the stdout.

printf (const char format,…)

int 

Formats arguments based on format and prints formatted data to the stdout.

fprintf (FILE stream, const char format,…)

int 

Formats arguments based on format and prints formatted data to a specified file stream.

sprintf (char str, const char format,…)

int 

Prints formatted data from a variable argument list to a specified string.

snprintf (char str, size_t size, const char format,…)

int 

Prints formatted data of a maximum of size bytes from a variable argument list to a specified string.

vprintf (const char format, va_list ap)

int 

Prints formatted data from a variable argument list to the stdout.

vfprintf (FILEstream, const char format, va_list ap)

int 

Prints formatted data from a variable argument list to a specified file stream.

vsprintf (char str, const char format, va_list ap)

int 

Prints formatted data from a variable argument list to a specified string.

vsnprintf (char str, size_t size, const char format, va_list ap)

int 

Prints formatted data of a maximum of size bytes from a variable argument list to a specified string.

scanf (const char format,…)

int 

Reads formatted data from the stdin and stores the data to the additional arguments based on format.

fscanf (FILE stream, const char format,…)

int 

Reads formatted data from a specified file stream and stores it based on format into the locations pointed to by the variable arguments.

sscanf (const char str, const char format,…)

int 

Reads data from a character string pointed to by str and stores it based on format into the locations pointed to by the variable arguments.

vscanf (const char format, va_list ap)

int 

Reads data from the stdin and stores it based on format into the locations pointed to by the elements in the variable argument list identified by ap.

vfscanf (FILEstream, const char format, va_list ap)

int 

Reads data from a specified file stream and stores it based on format into the locations pointed to by the elements in the variable argument list identified by ap.

vsscanf (const char str, const char format, va_list ap)

int 

Reads data from a specified string and stores it based on format into the locations pointed to by the elements in the variable argument list identified by ap.

perror (const char msg)

void 

Prints the last error occurred during a call to a system or library function to the standard error output stream (stderr).

setvbuf (FILE stream, char buf, int mode, size_t size)

int 

Sets the mode and size of the buffer for a specified stream.

setbuf (FILE stream, char buf)

void 

Sets a buffer to be used by a specified stream.

fmemopen (void buf, size_t size, const char mode)

FILE  

Opens a memory stream that allows the access mode specified by mode.

open_memstream (char ptr, size_t size)

FILE  

Opens a stream for writing to a specified buffer.

pclose (FILEf)

int 

Closes a specified pipe.

fileno (FILE fp)

int 

Obtains the file descriptor of a specified file stream.

fseeko (FILEfp, off_t offset, int whence)

int 

Sets the position of the next input or output operation on a specified file stream.

ftello (FILE fp)

off_t 

Obtains the current value of the file position indicator for a specified file stream.

dprintf (int fd, const char format,…)

int 

Prints formatted data to a specified file.

vdprintf (int fd, const char format, va_list ap)

int 

Prints formatted data from a variable argument list to a specified file.

ftrylockfile (FILEfilehandle)

int 

Locks a specified file.

funlockfile (FILE filehandle)

void 

Unlocks a specified file.

getc_unlocked (FILEstream)

int 

Obtains a character from a specified file stream without locking the file stream or checking whether it is locked.

getchar_unlocked (void)

int 

Obtains the next character from stdin.

putc_unlocked (int c, FILE stream)

int 

Writes a character to a specified file stream with the thread remains unlocked.

putchar_unlocked (int c)

int 

Writes a character to the stdout with the thread remains unlocked.

getdelim (char lineptr, size_t n, int delim, FILEstream)

ssize_t 

Reads an entire line from a specified file stream.

getline (char lineptr, size_t n, FILEstream)

ssize_t 

Reads an entire line from a specified file stream.

tempnam (const char dir, const char prefix)

char  

Creates a temporary file with a unique file name.

setbuffer (FILE f, char buf, size_t size)

void 

Sets the buffer for a specified file stream.

setlinebuf (FILE f)

void 

Sets the linear buffer for a specified file stream.

fgetc (FILEstream)

int 

Reads a character from the file pointed to by stream.

fgetc_unlocked (FILE stream)

int 

Reads a character from the file pointed to by stream with the thread remains unlocked.

fputc_unlocked (int c, FILEstream)

int 

Writes a character to the file stream pointed to by stream at the current position.

ferror_unlocked (FILE stream)

int 

Tests for the error identifier of a specified file stream.

getw (FILEstream)

int 

Reads a word (an int value) from a specified file stream.

putw (int w, FILE stream)

int 

Writes a word (an int value) to a specified file stream.

fgetln (FILEstream, size_t len)

char * 

Reads a line of data from the current position of a specified file stream.

asprintf (char strp, const char fmt,…)

int 

Prints formatted data to a specified character string.

vasprintf (char **strp, const char fmt, va_list ap)

int 

Prints formatted data from a variable argument list to a specified character string.