StdIO Functions

Source location

• The main source for string functions is located at: libc/src/stdio with subdirectories for internal implementations.

Implementation Status

Formatted Input/Output Functions

These functions take in format strings and arguments of various types and convert either to or from those arguments. These functions are the current focus (owner: michaelrj).

Function Name	Available
*printf	Mostly
*scanf	✅

FILE Access

These functions are used to interact with the FILE object type, which is an I/O stream, often used to represent a file on the host’s hard drive. Currently the FILE object is only available on linux.

Function Name	Available
fopen	✅
freopen
fclose	✅
fflush	✅
setbuf	✅
setvbuf	✅
ftell	✅
fgetpos
fseek	✅
fsetpos
rewind
tmpfile
clearerr	✅
feof	✅
ferror	✅
flockfile	✅
funlockfile	✅

Operations on system files

These functions operate on files on the host’s system, without using the FILE object type. They only take the name of the file being operated on.

Function_Name	Available
remove	✅
rename	✅
tmpnam

Unformatted FILE Input/Output Functions

The gets function was removed in C11 for having no bounds checking and therefor being impossible to use safely.

Function Name	Available
(f)getc	✅
fgets	✅
getchar	✅
fread	✅
(f)putc	✅
(f)puts	✅
putchar	✅
fwrite	✅
ungetc	✅