vsprintf.h File Reference

printf() and friends More...

#include <stdint.h>
#include <stdarg.h>
#include <stdio.h>

Go to the source code of this file.

Data Structures
struct	printf_context
	A printf context. More...

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
size_t	vcprintf (struct printf_context *ctx, const char *fmt, va_list args)
	Write a formatted string to a printf context. More...
int	vssnprintf (char *buf, ssize_t ssize, const char *fmt, va_list args)
	Version of vsnprintf() that accepts a signed buffer size. More...
int	__attribute__ ((format(printf, 3, 4))) ssnprintf(char *buf

Variables
int ssize_t	ssize
int ssize_t const char *	fmt

Detailed Description

printf() and friends

Etherboot's printf() functions understand the following subset of the standard C printf()'s format specifiers:

 - Flag characters
    - '#'           - Alternate form (i.e. "0x" prefix)
    - '0'           - Zero-pad
 - Field widths
 - Length modifiers
    - 'hh'          - Signed / unsigned char
    - 'h'           - Signed / unsigned short
    - 'l'           - Signed / unsigned long
    - 'll'          - Signed / unsigned long long
    - 'z'           - Signed / unsigned size_t
 - Conversion specifiers
    - 'd'           - Signed decimal
    - 'x','X'       - Unsigned hexadecimal
    - 'c'           - Character
    - 's'           - String
    - 'p'           - Pointer

Hexadecimal numbers are always zero-padded to the specified field width (if any); decimal numbers are always space-padded. Decimal long longs are not supported.

Definition in file vsprintf.h.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

vcprintf()

size_t vcprintf	(	struct printf_context *	ctx,
		const char *	fmt,
		va_list	args
	)

Write a formatted string to a printf context.

Parameters

ctx	Context
fmt	Format string
args	Arguments corresponding to the format string

Return values

len	Length of formatted string

Definition at line 187 of file vsprintf.c.

                                                                              {
        int flags;
        int width;
        uint8_t *length;
        char *ptr;
        char tmp_buf[32]; /* 32 is enough for all numerical formats.
                           * Insane width fields could overflow this buffer. */
        wchar_t *wptr;

        /* Initialise context */
        ctx->len = 0;

        for ( ; *fmt ; fmt++ ) {
                /* Pass through ordinary characters */
                if ( *fmt != '%' ) {
                        cputchar ( ctx, *fmt );
                        continue;
                }
                fmt++;
                /* Process flag characters */
                flags = 0;
                for ( ; ; fmt++ ) {
                        if ( *fmt == '#' ) {
                                flags |= ALT_FORM;
                        } else if ( *fmt == '0' ) {
                                flags |= ZPAD;
                        } else {
                                /* End of flag characters */
                                break;
                        }
                }
                /* Process field width */
                width = 0;
                for ( ; ; fmt++ ) {
                        if ( ( ( unsigned ) ( *fmt - '0' ) ) < 10 ) {
                                width = ( width * 10 ) + ( *fmt - '0' );
                        } else {
                                break;
                        }
                }
                /* We don't do floating point */
                /* Process length modifier */
                length = &type_sizes[INT_LEN];
                for ( ; ; fmt++ ) {
                        if ( *fmt == 'h' ) {
                                length--;
                        } else if ( *fmt == 'l' ) {
                                length++;
                        } else if ( *fmt == 'z' ) {
                                length = &type_sizes[SIZE_T_LEN];
                        } else {
                                break;
                        }
                }
                /* Process conversion specifier */
                ptr = tmp_buf + sizeof ( tmp_buf ) - 1;
                *ptr = '\0';
                wptr = NULL;
                if ( *fmt == 'c' ) {
                        if ( length < &type_sizes[LONG_LEN] ) {
                                cputchar ( ctx, va_arg ( args, unsigned int ) );
                        } else {
                                wchar_t wc;
                                size_t len;

                                wc = va_arg ( args, wint_t );
                                len = wcrtomb ( tmp_buf, wc, NULL );
                                tmp_buf[len] = '\0';
                                ptr = tmp_buf;
                        }
                } else if ( *fmt == 's' ) {
                        if ( length < &type_sizes[LONG_LEN] ) {
                                ptr = va_arg ( args, char * );
                                if ( ! ptr )
                                        ptr = "<NULL>";
                        } else {
                                wptr = va_arg ( args, wchar_t * );
                                if ( ! wptr )
                                        ptr = "<NULL>";
                        }
                } else if ( *fmt == 'p' ) {
                        intptr_t ptrval;

                        ptrval = ( intptr_t ) va_arg ( args, void * );
                        ptr = format_hex ( ptr, ptrval, width, 
                                           ( ALT_FORM | LCASE ) );
                } else if ( ( *fmt & ~0x20 ) == 'X' ) {
                        unsigned long long hex;

                        flags |= ( *fmt & 0x20 ); /* LCASE */
                        if ( *length >= sizeof ( unsigned long long ) ) {
                                hex = va_arg ( args, unsigned long long );
                        } else if ( *length >= sizeof ( unsigned long ) ) {
                                hex = va_arg ( args, unsigned long );
                        } else {
                                hex = va_arg ( args, unsigned int );
                        }
                        ptr = format_hex ( ptr, hex, width, flags );
                } else if ( ( *fmt == 'd' ) || ( *fmt == 'i' ) ){
                        signed long decimal;

                        if ( *length >= sizeof ( signed long ) ) {
                                decimal = va_arg ( args, signed long );
                        } else {
                                decimal = va_arg ( args, signed int );
                        }
                        ptr = format_decimal ( ptr, decimal, width, flags );
                } else {
                        *(--ptr) = *fmt;
                }
                /* Write out conversion result */
                if ( wptr == NULL ) {
                        for ( ; *ptr ; ptr++ ) {
                                cputchar ( ctx, *ptr );
                        }
                } else {
                        for ( ; *wptr ; wptr++ ) {
                                size_t len = wcrtomb ( tmp_buf, *wptr, NULL );
                                for ( ptr = tmp_buf ; len-- ; ptr++ ) {
                                        cputchar ( ctx, *ptr );
                                }
                        }
                }
        }

        return ctx->len;
}

References ALT_FORM, cputchar(), ctx, flags, fmt, format_decimal(), format_hex(), hex, INT_LEN, LCASE, len, length, LONG_LEN, NULL, SIZE_T_LEN, type_sizes, va_arg, wc, and ZPAD.

Referenced by efi_vsnprintf(), vprintf(), vsnprintf(), and vw_printw().

vssnprintf()

int vssnprintf	(	char *	buf,
		ssize_t	ssize,
		const char *	fmt,
		va_list	args
	)

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

Parameters

buf	Buffer into which to write the string
size	Size of buffer
fmt	Format string
args	Arguments corresponding to the format string

Return values

len	Length of formatted string

Definition at line 401 of file vsprintf.c.

                                                                           {

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

        /* Hand off to vsnprintf */
        return vsnprintf ( buf, ssize, fmt, args );
}

References sputc_context::buf, fmt, ssize, and vsnprintf().

Referenced by ssnprintf().

__attribute__()

int __attribute__

(

(format(printf, 3, 4))

)

Variable Documentation

ssize

int ssize_t ssize

Definition at line 72 of file vsprintf.h.

Referenced by ssnprintf(), and vssnprintf().

fmt

int int size_t const char int const char * fmt

Definition at line 72 of file vsprintf.h.

Referenced by alert(), asprintf(), dbg_printf(), efi_asprintf(), efi_ifr_string(), efi_snprintf(), efi_ssnprintf(), efi_vasprintf(), efi_vsnprintf(), efi_vsprintf(), efi_vssnprintf(), ipair_tx(), log_printf(), log_vprintf(), msg(), printf(), slk_init(), slk_set(), snprintf(), snprintf_okx(), ssnprintf(), valert(), vasprintf(), vcprintf(), vmsg(), vprintf(), vsnprintf(), vssnprintf(), vw_printw(), vwprintw(), and wprintw().