efi_strings.c File Reference

#include <stddef.h>
#include <stdarg.h>
#include <stdlib.h>
#include <errno.h>
#include <ipxe/vsprintf.h>
#include <ipxe/efi/efi_strings.h>

Go to the source code of this file.

Data Structures
struct	efi_sputc_context
	Context used by efi_vsnprintf() and friends. More...

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
	FILE_SECBOOT (PERMITTED)
static void	efi_printf_sputc (struct printf_context *ctx, unsigned int c)
	Write wide character to buffer. More...
int	efi_vsnprintf (wchar_t *wbuf, size_t wsize, const char *fmt, va_list args)
	Write a formatted string to a wide-character buffer. More...
int	efi_snprintf (wchar_t *wbuf, size_t wsize, const char *fmt,...)
	Write a formatted string to a buffer. More...
int	efi_vssnprintf (wchar_t *wbuf, ssize_t swsize, const char *fmt, va_list args)
	Version of efi_vsnprintf() that accepts a signed buffer size. More...
int	efi_ssnprintf (wchar_t *wbuf, ssize_t swsize, const char *fmt,...)
	Version of efi_vsnprintf() that accepts a signed buffer size. More...
int	efi_vasprintf (wchar_t **wstrp, const char *fmt, va_list args)
	Write a formatted string to newly allocated memory. More...
int	efi_asprintf (wchar_t **wstrp, const char *fmt,...)
	Write a formatted string to newly allocated memory. More...

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

FILE_SECBOOT()

FILE_SECBOOT

(

PERMITTED

)

efi_printf_sputc()

static void efi_printf_sputc ( struct printf_context *  ctx, unsigned int  c  )

static

Write wide character to buffer.

Parameters

ctx	Context
c	Character

Definition at line 54 of file efi_strings.c.

                                                                            {
        struct efi_sputc_context * sctx =
                container_of ( ctx, struct efi_sputc_context, ctx );

        if ( ctx->len < sctx->max_wlen )
                sctx->buf[ctx->len] = c;
}

References efi_sputc_context::buf, container_of, ctx, and efi_sputc_context::max_wlen.

Referenced by efi_vsnprintf().

efi_vsnprintf()

int efi_vsnprintf	(	wchar_t *	wbuf,
		size_t	wsize,
		const char *	fmt,
		va_list	args
	)

Write a formatted string to a wide-character buffer.

Parameters

wbuf	Buffer into which to write the string
wsize	Size of buffer (in wide characters)
fmt	Format string
args	Arguments corresponding to the format string

Return values

wlen	Length of formatted string (in wide characters)

If the buffer is too small to contain the string, the returned length is the length that would have been written had enough space been available.

Definition at line 75 of file efi_strings.c.

                                   {
        struct efi_sputc_context sctx;
        size_t wlen;
        size_t wend;

        /* Hand off to vcprintf */
        sctx.ctx.handler = efi_printf_sputc;
        sctx.buf = wbuf;
        sctx.max_wlen = wsize;
        wlen = vcprintf ( &sctx.ctx, fmt, args );

        /* Add trailing NUL */
        if ( wsize ) {
                wend = wsize - 1;
                if ( wlen < wend )
                        wend = wlen;
                wbuf[wend] = '\0';
        }

        return wlen;
}

References efi_sputc_context::buf, efi_sputc_context::ctx, efi_printf_sputc(), fmt, printf_context::handler, efi_sputc_context::max_wlen, and vcprintf().

Referenced by efi_ifr_string(), efi_snprintf(), efi_vasprintf(), efi_vsprintf(), and efi_vssnprintf().

efi_snprintf()

int efi_snprintf	(	wchar_t *	wbuf,
		size_t	wsize,
		const char *	fmt,
			...
	)

Write a formatted string to a buffer.

Parameters

wbuf	Buffer into which to write the string
wsize	Size of buffer (in wide characters)
fmt	Format string
...	Arguments corresponding to the format string

Return values

wlen	Length of formatted string (in wide characters)

Definition at line 107 of file efi_strings.c.

                                                                       {
        va_list args;
        int i;

        va_start ( args, fmt );
        i = efi_vsnprintf ( wbuf, wsize, fmt, args );
        va_end ( args );
        return i;
}

References efi_vsnprintf(), fmt, va_end, and va_start.

Referenced by efi_block_filename(), efi_boot_path(), efi_file_varlen(), efi_image_path(), efi_local_open_resolved(), efi_snp_hii_append(), efi_snp_probe(), and efivars_fetch().

efi_vssnprintf()

int efi_vssnprintf	(	wchar_t *	wbuf,
		ssize_t	swsize,
		const char *	fmt,
		va_list	args
	)

Version of efi_vsnprintf() that accepts a signed buffer size.

Parameters

wbuf	Buffer into which to write the string
swsize	Size of buffer (in wide characters)
fmt	Format string
args	Arguments corresponding to the format string

Return values

wlen	Length of formatted string (in wide characters)

Definition at line 126 of file efi_strings.c.

                                    {

        /* Treat negative buffer size as zero buffer size */
        if ( swsize < 0 )
                swsize = 0;

        /* Hand off to vsnprintf */
        return efi_vsnprintf ( wbuf, swsize, fmt, args );
}

References efi_vsnprintf(), and fmt.

Referenced by efi_ssnprintf().

efi_ssnprintf()

int efi_ssnprintf	(	wchar_t *	wbuf,
		ssize_t	swsize,
		const char *	fmt,
			...
	)

Version of efi_vsnprintf() that accepts a signed buffer size.

Parameters

wbuf	Buffer into which to write the string
swsize	Size of buffer (in wide characters)
fmt	Format string
...	Arguments corresponding to the format string

Return values

wlen	Length of formatted string (in wide characters)

Definition at line 146 of file efi_strings.c.

                                                                          {
        va_list args;
        int len;

        /* Hand off to vssnprintf */
        va_start ( args, fmt );
        len = efi_vssnprintf ( wbuf, swsize, fmt, args );
        va_end ( args );
        return len;
}

References efi_vssnprintf(), fmt, len, va_end, and va_start.

efi_vasprintf()

int efi_vasprintf	(	wchar_t **	wstrp,
		const char *	fmt,
		va_list	args
	)

Write a formatted string to newly allocated memory.

Parameters

wstrp	Pointer to hold allocated string
fmt	Format string
args	Arguments corresponding to the format string

Return values

len	Length of formatted string (in wide characters)

Definition at line 165 of file efi_strings.c.

                                                                     {
        size_t len;
        va_list args_tmp;

        /* Calculate length needed for string */
        va_copy ( args_tmp, args );
        len = ( efi_vsnprintf ( NULL, 0, fmt, args_tmp ) + 1 );
        va_end ( args_tmp );

        /* Allocate and fill string */
        *wstrp = malloc ( len * sizeof ( **wstrp ) );
        if ( ! *wstrp )
                return -ENOMEM;
        return efi_vsnprintf ( *wstrp, len, fmt, args );
}

References efi_vsnprintf(), ENOMEM, fmt, len, malloc(), NULL, va_copy, and va_end.

Referenced by efi_asprintf().

efi_asprintf()

int efi_asprintf	(	wchar_t **	wstrp,
		const char *	fmt,
			...
	)

Write a formatted string to newly allocated memory.

Parameters

wstrp	Pointer to hold allocated string
fmt	Format string
...	Arguments corresponding to the format string

Return values

len	Length of formatted string (in wide characters)

Definition at line 189 of file efi_strings.c.

                                                           {
        va_list args;
        int len;

        va_start ( args, fmt );
        len = efi_vasprintf ( wstrp, fmt, args );
        va_end ( args );
        return len;
}

References efi_vasprintf(), fmt, len, va_end, and va_start.

Referenced by efi_image_cmdline(), and efi_shim_cmdline().