d0/d8a/vwritef_8c_source.html

#include <errno.h>

#include <stdarg.h>

#include <stdio.h>

#include <sys/io.h>


uint64_t vwritef(fd_t fd, const char* _RESTRICT format, va_list args)

{

    char buffer[0x1000];

    int count = vsnprintf(buffer, sizeof(buffer), format, args);

    if (count < 0 || (uint64_t)count >= sizeof(buffer))

    {

        errno = EINVAL;

        return ERR;

    }

    return write(fd, buffer, count);

}


errno.h

EINVAL
#define EINVAL
Invalid argument.
Definition errno.h:142

errno
#define errno
Error number variable.
Definition errno.h:27

vwritef
uint64_t vwritef(fd_t fd, const char *_RESTRICT format, va_list args)
Wrapper for writing a formatted string to a file with a va_list.
Definition vwritef.c:6

write
uint64_t write(fd_t fd, const void *buffer, uint64_t count)
System call for writing to files.
Definition write.c:9

ERR
#define ERR
Integer error value.
Definition ERR.h:17

fd_t
__UINT64_TYPE__ fd_t
A file descriptor.
Definition fd_t.h:12

io.h

_RESTRICT
#define _RESTRICT
Definition config.h:17

buffer
EFI_PHYSICAL_ADDRESS buffer
Definition mem.c:15

count
static atomic_long count
Definition main.c:9

stdarg.h

va_list
__builtin_va_list va_list
Definition stdarg.h:9

uint64_t
__UINT64_TYPE__ uint64_t
Definition stdint.h:17

stdio.h

vsnprintf
_PUBLIC int vsnprintf(char *_RESTRICT s, size_t n, const char *_RESTRICT format, va_list arg)
Definition vsnprintf.c:5