ref: 874701d1934617a5992511b713c8a0fe08491dd9
dir: /sys/src/libstdio/Stdio.h/
/*
* pANS stdio.h
*/
/*
* According to X3J11, there is only one i/o buffer
* and it must not be occupied by both input and output data.
* If rp<wp, we must have state==RD and
* if wp<rp, we must have state==WR, so that getc and putc work correctly.
* On open, rp, wp and buf are set to 0, so first getc or putc will call _IO_getc
* or _IO_putc, which will allocate the buffer.
* If setvbuf(., ., _IONBF, .) is called, bufl is set to 0 and
* buf, rp and wp are pointed at unbuf.
* If setvbuf(., ., _IOLBF, .) is called, _IO_putc leaves wp and rp pointed at the
* end of the buffer so that it can be called on each putc to check whether it's got
* a newline. This nonsense is in order to avoid impacting performance of the other
* buffering modes more than necessary -- putting the test in putc adds many
* instructions that are wasted in non-_IOLBF mode:
* #define putc(c, f) (_IO_ctmp=(c),\
* (f)->wp>=(f)->rp || (f)->flags&LINEBUF && _IO_ctmp=='\n'\
* ?_IO_putc(_IO_ctmp, f)\
* :*(f)->wp++=_IO_ctmp)
*
*/
typedef struct{
int fd; /* UNIX file pointer */
char flags; /* bits for must free buffer on close, line-buffered */
char state; /* last operation was read, write, position, error, eof */
char *buf; /* pointer to i/o buffer */
char *rp; /* read pointer (or write end-of-buffer) */
char *wp; /* write pointer (or read end-of-buffer) */
char *lp; /* actual write pointer used when line-buffering */
long bufl; /* actual length of buffer */
char unbuf[1]; /* tiny buffer for unbuffered io (used for ungetc?) */
}FILE;
typedef long fpos_t;
#ifndef NULL
#define NULL 0
#endif
/*
* Third arg of setvbuf
*/
#define _IOFBF 1 /* block-buffered */
#define _IOLBF 2 /* line-buffered */
#define _IONBF 3 /* unbuffered */
#define BUFSIZ 4096 /* size of setbuf buffer */
#define EOF (-1) /* returned on end of file */
#define FOPEN_MAX 128 /* max files open */
#define FILENAME_MAX BUFSIZ /* silly filename length */
#define L_tmpnam 20 /* sizeof "/tmp/abcdefghij9999 */
#define SEEK_CUR 1
#define SEEK_END 2
#define SEEK_SET 0
#define TMP_MAX 64 /* very hard to set correctly */
#define stderr (&_IO_stream[2])
#define stdin (&_IO_stream[0])
#define stdout (&_IO_stream[1])
#define _IO_CHMASK 0377 /* mask for 8 bit characters */
FILE *tmpfile(void);
char *tmpnam(char *);
int fclose(FILE *);
int fflush(FILE *);
FILE *fopen(const char *, const char *);
FILE *freopen(const char *, const char *, FILE *);
void setbuf(FILE *, char *);
int setvbuf(FILE *, char *, int, long);
int fprintf(FILE *, const char *, ...);
int fscanf(FILE *, const char *, ...);
int printf(const char *, ...);
int scanf(const char *, ...);
int sprintf(char *, const char *, ...);
int sscanf(const char *, const char *, ...);
int vfprintf(FILE *, const char *, va_list);
int vprintf(const char *, va_list);
int vsprintf(char *, const char *, va_list);
int vfscanf(FILE *, const char *, va_list);
int fgetc(FILE *);
char *fgets(char *, int, FILE *);
int fputc(int, FILE *);
int fputs(const char *, FILE *);
int getc(FILE *);
#define getc(f) ((f)->rp>=(f)->wp?_IO_getc(f):*(f)->rp++&_IO_CHMASK)
int _IO_getc(FILE *f);
int getchar(void);
#define getchar() getc(stdin)
char *gets(char *);
int putc(int, FILE *);
#define putc(c, f) ((f)->wp>=(f)->rp?_IO_putc(c, f):(*(f)->wp++=c)&_IO_CHMASK)
int _IO_putc(int, FILE *);
int putchar(int);
#define putchar(c) putc(c, stdout)
int puts(const char *);
int ungetc(int, FILE *);
long fread(void *, long, long, FILE *);
long fwrite(const void *, long, long, FILE *);
int fgetpos(FILE *, fpos_t *);
int fseek(FILE *, long int, int);
int fsetpos(FILE *, const fpos_t *);
long int ftell(FILE *);
void rewind(FILE *);
void clearerr(FILE *);
int feof(FILE *);
int ferror(FILE *);
void perror(const char *);
extern FILE _IO_stream[FOPEN_MAX];
FILE *sopenr(const char *);
FILE *sopenw(void);
char *sclose(FILE *);
char *dtoa(double, int, int, int*, int*, char**);
void freedtoa(char*);