1 #pragma src "/sys/src/libstdio"
2 #pragma lib "libstdio.a"
8 * According to X3J11, there is only one i/o buffer
9 * and it must not be occupied by both input and output data.
10 * If rp<wp, we must have state==RD and
11 * if wp<rp, we must have state==WR, so that getc and putc work correctly.
12 * On open, rp, wp and buf are set to 0, so first getc or putc will call _IO_getc
13 * or _IO_putc, which will allocate the buffer.
14 * If setvbuf(., ., _IONBF, .) is called, bufl is set to 0 and
15 * buf, rp and wp are pointed at unbuf.
16 * If setvbuf(., ., _IOLBF, .) is called, _IO_putc leaves wp and rp pointed at the
17 * end of the buffer so that it can be called on each putc to check whether it's got
18 * a newline. This nonsense is in order to avoid impacting performance of the other
19 * buffering modes more than necessary -- putting the test in putc adds many
20 * instructions that are wasted in non-_IOLBF mode:
21 * #define putc(c, f) (_IO_ctmp=(c),\
22 * (f)->wp>=(f)->rp || (f)->flags&LINEBUF && _IO_ctmp=='\n'\
23 * ?_IO_putc(_IO_ctmp, f)\
24 * :*(f)->wp++=_IO_ctmp)
28 int fd; /* UNIX file pointer */
29 char flags; /* bits for must free buffer on close, line-buffered */
30 char state; /* last operation was read, write, position, error, eof */
31 char *buf; /* pointer to i/o buffer */
32 char *rp; /* read pointer (or write end-of-buffer) */
33 char *wp; /* write pointer (or read end-of-buffer) */
34 char *lp; /* actual write pointer used when line-buffering */
35 long bufl; /* actual length of buffer */
36 char unbuf[1]; /* tiny buffer for unbuffered io (used for ungetc?) */
40 #define NULL ((void*)0)
43 * Third arg of setvbuf
45 #define _IOFBF 1 /* block-buffered */
46 #define _IOLBF 2 /* line-buffered */
47 #define _IONBF 3 /* unbuffered */
48 #define BUFSIZ 4096 /* size of setbuf buffer */
49 #define EOF (-1) /* returned on end of file */
50 #define FOPEN_MAX 100 /* max files open */
51 #define FILENAME_MAX BUFSIZ /* silly filename length */
52 #define L_tmpnam 20 /* sizeof "/tmp/abcdefghij9999 */
53 #ifndef SEEK_SET /* also defined in unistd.h */
58 #define TMP_MAX 64 /* very hard to set correctly */
59 #define stderr (&_IO_stream[2])
60 #define stdin (&_IO_stream[0])
61 #define stdout (&_IO_stream[1])
62 #define _IO_CHMASK 0377 /* mask for 8 bit characters */
67 FILE *fopen(const char *, const char *);
68 FILE *fdopen(const int, const char *);
69 FILE *freopen(const char *, const char *, FILE *);
70 void setbuf(FILE *, char *);
71 int setvbuf(FILE *, char *, int, long);
72 int fprintf(FILE *, const char *, ...);
73 int fscanf(FILE *, const char *, ...);
74 int printf(const char *, ...);
75 int scanf(const char *, ...);
76 int sprintf(char *, const char *, ...);
77 int snprintf(char *, int, const char *, ...);
78 int sscanf(const char *, const char *, ...);
79 int vfprintf(FILE *, const char *, va_list);
80 int vprintf(const char *, va_list);
81 int vsprintf(char *, const char *, va_list);
82 int vsnprintf(char *, int, const char *, va_list);
83 int vfscanf(FILE *, const char *, va_list);
85 char *fgets(char *, int, FILE *);
86 int fputc(int, FILE *);
87 int fputs(const char *, FILE *);
89 #define getc(f) ((f)->rp>=(f)->wp?_IO_getc(f):*(f)->rp++&_IO_CHMASK)
90 int _IO_getc(FILE *f);
92 #define getchar() getc(stdin)
94 int putc(int, FILE *);
95 #define putc(c, f) ((f)->wp>=(f)->rp?_IO_putc(c, f):(*(f)->wp++=c)&_IO_CHMASK)
96 int _IO_putc(int, FILE *);
98 #define putchar(c) putc(c, stdout)
99 int puts(const char *);
100 int ungetc(int, FILE *);
101 long fread(void *, long, long, FILE *);
102 long fwrite(const void *, long, long, FILE *);
103 int fgetpos(FILE *, fpos_t *);
104 int fseek(FILE *, long, int);
105 int fseeko(FILE *, long long, int);
106 int fsetpos(FILE *, const fpos_t *);
108 long long ftello(FILE *);
110 void clearerr(FILE *);
113 void perror(const char *);
114 extern FILE _IO_stream[FOPEN_MAX];
115 FILE *sopenr(const char *);
117 char *sclose(FILE *);