systemd/klibc/include/stdio.h

/*
 * stdio.h
 */

#ifndef _STDIO_H
#define _STDIO_H

#include <klibc/extern.h>
#include <stdarg.h>
#include <stddef.h>
#include <unistd.h>

/* This structure doesn't really exist, but it gives us something
   to define FILE * with */
struct _IO_file;
typedef struct _IO_file FILE;

#ifndef EOF
# define EOF (-1)
#endif

#ifndef BUFSIZ
# define BUFSIZ 4096
#endif

#define SEEK_SET 0
#define SEEK_CUR 1
#define SEEK_END 2

/*
 * Convert between a FILE * and a file descriptor.  We don't actually
 * have any in-memory data, so we just abuse the pointer itself to
 * hold the data.  Note, however, that for file descriptors, -1 is
 * error and 0 is a valid value; for FILE *, NULL (0) is error and
 * non-NULL are valid.
 */
static __inline__ int fileno(FILE *__f)
{
  /* This should really be intptr_t, but size_t should be the same size */
  return (int)(size_t)__f - 1;
}

/* This is a macro so it can be used as initializer */
#define __create_file(__fd) ((FILE *)(size_t)((__fd) + 1))

#define stdin  __create_file(0)
#define stdout __create_file(1)
#define stderr __create_file(2)

__extern FILE *fopen(const char *, const char *);

static __inline__ FILE *fdopen(int __fd, const char *__m)
{
  (void)__m; return __create_file(__fd);
}
static __inline__ int fclose(FILE *__f)
{
  extern int close(int);
  return close(fileno(__f));
}
static __inline__ int fseek(FILE *__f, off_t __o, int __w)
{
  extern off_t lseek(int, off_t, int);
  return (lseek(fileno(__f), __o, __w) == (off_t)-1) ? -1 : 0;
}
static __inline__ off_t ftell(FILE *__f)
{
  extern off_t lseek(int, off_t, int);
  return lseek(fileno(__f), 0, SEEK_CUR);
}

__extern int fputs(const char *, FILE *);
__extern int puts(const char *);
__extern int fputc(int, FILE *);
#define putc(c,f)  fputc((c),(f))
#define putchar(c) fputc((c),stdout)

__extern int    fgetc(FILE *);
__extern char * fgets(char *, int, FILE *);
#define getc(f) fgetc(f)

__extern size_t _fread(void *, size_t, FILE *);
__extern size_t _fwrite(const void *, size_t, FILE *);

#ifndef __NO_FREAD_FWRITE_INLINES
extern __inline__ size_t
fread(void *__p, size_t __s, size_t __n, FILE *__f)
{
  return _fread(__p, __s*__n, __f)/__s;
}

extern __inline__ size_t
fwrite(const void *__p, size_t __s, size_t __n, FILE *__f)
{
  return _fwrite(__p, __s*__n, __f)/__s;
}
#endif

__extern int printf(const char *, ...);
__extern int vprintf(const char *, va_list);
__extern int fprintf(FILE *, const char *, ...);
__extern int vfprintf(FILE *, const char *, va_list);
__extern int sprintf(char *, const char *, ...);
__extern int vsprintf(char *, const char *, va_list);
__extern int snprintf(char *, size_t n, const char *, ...);
__extern int vsnprintf(char *, size_t n, const char *, va_list);
__extern int asprintf(char **, const char *, ...);
__extern int vasprintf(char **, const char *, va_list);

/* No buffering, so no flushing needed */
extern __inline__ int
fflush(FILE *__f)
{
  (void)__f;
  return 0;
}

__extern int sscanf(const char *, const char *, ...);
__extern int vsscanf(const char *, const char *, va_list);

__extern void perror(const char *);

__extern int rename(const char *, const char *);

#endif /* _STDIO_H */