ref: 1a5c8430d20d7ec5cd52c8335af6490ab1dabcf2
dir: /sys/include/stdio.h/
#pragma src "/sys/src/libstdio" #pragma lib "libstdio.a" /* * pANS astdio.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 ((void*)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 100 /* max files open */ #define FILENAME_MAX BUFSIZ /* silly filename length */ #define L_tmpnam 20 /* sizeof "/tmp/abcdefghij9999 */ #ifndef SEEK_SET /* also defined in unistd.h */ #define SEEK_CUR 1 #define SEEK_END 2 #define SEEK_SET 0 #endif #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 *fdopen(const int, 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 snprintf(char *, int, 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 vsnprintf(char *, int, 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 fseeko(FILE *, long long, int); int fsetpos(FILE *, const fpos_t *); long ftell(FILE *); long long ftello(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 *); int fileno(FILE *);