Supported stdio.h standard file API

pico-vfs provides low-level file IO "system calls", allowing many of the file manipulation APIs of stdio.h to be used.

System call

System call	Availability	Standard
`close`	✅	IEEE Std 1003.1-1988 ("POSIX.1")
`fstat`	✅	IEEE Std 1003.1-1988 ("POSIX.1")
`lseek`	✅	IEEE Std 1003.1-1988 ("POSIX.1")
`open`	✅	Version 6 AT&T UNIX
`read`	✅	IEEE Std 1003.1-1990 ("POSIX.1")
`stat`	✅	IEEE Std 1003.1-1988 ("POSIX.1")
`unlink`	✅	POSIX.1-2008
`write`	✅	IEEE Std 1003.1-1990 ("POSIX.1")

Input and Output(stdio.h)

Note that many functions from stdio.h are available, but some do not behave as expected. Among the input/output functions that have been tested to work, those related to POSIX and the C standard are as follows:

Function	Availability	Standard
`clearerr`	✅	ISO/IEC 9899:1990 ("ISO C90")
`fflush`	✅	ISO/IEC 9899:1990 ("ISO C90") and Single UNIX Specification ("SUSv3")
`fgetc`	✅	ISO/IEC 9899:1990 ("ISO C90")
`fgetpos`	✅	ISO/IEC 9899:1990 ("ISO C90")
`fgets`	✅	ISO/IEC 9899:1999 ("ISO C99")
`fgetwc`	✅	ISO/IEC 9899:1999 ("ISO C99")
`fgetws`	✅	IEEE Std 1003.1-2001 ("POSIX.1")
`fileno`	✅	ISO/IEC 9899:1990 ("ISO C90")
`fmemopen`	✅	IEEE Std 1003.1-2008 ("POSIX.1")
`fopen`	✅	ISO/IEC 9899:1990 ("ISO C90")
`fprintf`	✅	ANSI X3.159-1989 ("ANSI C89") and ISO/IEC 9899:1999 ("ISO C99")
`fputc`	✅	ISO/IEC 9899:1990 ("ISO C90")
`fputs`	✅	ISO/IEC 9899:1990 ("ISO C90")
`fputwc`	✅	ISO/IEC 9899:1999 ("ISO C99")
`fputws`	✅	IEEE Std 1003.1-2001 ("POSIX.1")
`fread`	✅	ISO/IEC 9899:1990 ("ISO C90")
`freopen`	✅	ISO/IEC 9899:1990 ("ISO C90")
`fscanf`	✅	ISO/IEC 9899:1999 ("ISO C99")
`fseek`	✅	ISO/IEC 9899:1990 ("ISO C90")
`fsetpos`	✅	ISO/IEC 9899:1990 ("ISO C90")
`ftell`	✅	ISO/IEC 9899:1990 ("ISO C90")
`fwide`	✅	ISO/IEC 9899:1999 ("ISO C99")
`fwprintf`	✅	ISO/IEC 9899:1999 ("ISO C99")
`fwrite`	✅	ISO/IEC 9899:1990 ("ISO C90")
`fwscanf`	✅	ISO/IEC 9899:1999 ("ISO C99")
`getc`	✅	ISO/IEC 9899:1990 ("ISO C90")
`getw`	✅	ISO/IEC 9899:1990 ("ISO C90")
`mkstemp`	✅	IEEE Std 1003.1-2008 ("POSIX.1")
`open_memstream`	✅	IEEE Std 1003.1-2008 ("POSIX.1")
`perror`	✅	ISO/IEC 9899:1999 ("ISO C99")
`putc`	✅	ISO/IEC 9899:1990 ("ISO C90")
`remove`	✅	ISO/IEC 9899:1990 ("ISO C90") and X/Open Portability Guide Issue 4, Version 2 ("XPG4.2")
`rename`	✅	IEEE Std 1003.1-1988 ("POSIX.1")
`rewind`	✅	ISO/IEC 9899:1990 ("ISO C90")
`setbuf`	✅	ISO/IEC 9899:1990 ("ISO C90")
`setvbuf`	✅	ISO/IEC 9899:1990 ("ISO C90")
`tmpfile`	❌	ISO/IEC 9899:1990 ("ISO C90")
`tmpnam`	❌	ISO/IEC 9899:1990 ("ISO C90")
`ungetc`	✅	ISO/IEC 9899:1990 ("ISO C90")
`ungetwc`	✅	ISO/IEC 9899:1999 ("ISO C99")
`vfprintf`	✅	ANSI X3.159-1989 ("ANSI C89") and ISO/IEC 9899:1999 ("ISO C99")
`vfscanf`	✅	ISO/IEC 9899:1999 ("ISO C99")
`vfwscanf`	✅	ISO/IEC 9899:1999 ("ISO C99")

For more information see the Newlib documentation.

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