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shf.h revision 1.1 
      1 /*
      2  * Shell file I/O routines
      3  */
      4 /* $Id: shf.h,v 1.1 1996/09/21 23:35:15 jtc Exp $ */
      5 
      6 #define SHF_BSIZE	512
      7 
      8 #define shf_fileno(shf)	((shf)->fd)
      9 #define shf_setfileno(shf,nfd)	((shf)->fd = (nfd))
     10 #define shf_getc(shf) ((shf)->rnleft > 0 ? (shf)->rnleft--, *(shf)->rp++ : \
     11 			shf_getchar(shf))
     12 #define shf_putc(c, shf)	((shf)->wnleft == 0 ? shf_putchar((c), (shf)) \
     13 					: ((shf)->wnleft--, *(shf)->wp++ = (c)))
     14 #define shf_eof(shf)		((shf)->flags & SHF_EOF)
     15 #define shf_error(shf)		((shf)->flags & SHF_ERROR)
     16 #define shf_errno(shf)		((shf)->errno_)
     17 #define shf_clearerr(shf)	((shf)->flags &= ~(SHF_EOF | SHF_ERROR))
     18 
     19 /* Flags passed to shf_*open() */
     20 #define SHF_RD		0x0001
     21 #define SHF_WR		0x0002
     22 #define SHF_RDWR	  (SHF_RD|SHF_WR)
     23 #define SHF_ACCMODE	  0x0003	/* mask */
     24 #define SHF_GETFL	0x0004		/* use fcntl() to figure RD/WR flags */
     25 #define SHF_UNBUF	0x0008		/* unbuffered I/O */
     26 #define SHF_CLEXEC	0x0010		/* set close on exec flag */
     27 #define SHF_MAPHI	0x0020		/* make fd > FDBASE (and close orig)
     28 					 * (shf_open() only) */
     29 #define SHF_DYNAMIC	0x0040		/* string: increase buffer as needed */
     30 #define SHF_INTERRUPT	0x0080		/* EINTR in read/write causes error */
     31 /* Flags used internally */
     32 #define SHF_STRING	0x0100		/* a string, not a file */
     33 #define SHF_ALLOCS	0x0200		/* shf and shf->buf were alloc()ed */
     34 #define SHF_ALLOCB	0x0400		/* shf->buf was alloc()ed */
     35 #define SHF_ERROR	0x0800		/* read()/write() error */
     36 #define SHF_EOF		0x1000		/* read eof (sticky) */
     37 #define SHF_READING	0x2000		/* currently reading: rnleft,rp valid */
     38 #define SHF_WRITING	0x4000		/* currently writing: wnleft,wp valid */
     39 
     40 
     41 struct shf {
     42 	int flags;		/* see SHF_* */
     43 	unsigned char *rp;	/* read: current position in buffer */
     44 	int rbsize;		/* size of buffer (1 if SHF_UNBUF) */
     45 	int rnleft;		/* read: how much data left in buffer */
     46 	unsigned char *wp;	/* write: current position in buffer */
     47 	int wbsize;		/* size of buffer (0 if SHF_UNBUF) */
     48 	int wnleft;		/* write: how much space left in buffer */
     49 	unsigned char *buf;	/* buffer */
     50 	int fd;			/* file descriptor */
     51 	int errno_;		/* saved value of errno after error */
     52 	int bsize;		/* actual size of buf */
     53 	Area *areap;		/* area shf/buf were allocated in */
     54 };
     55 
     56 extern struct shf shf_iob[];
     57 
     58 struct shf *shf_open	ARGS((const char *name, int oflags, int mode,
     59 			      int sflags));
     60 struct shf *shf_fdopen	ARGS((int fd, int sflags, struct shf *shf));
     61 struct shf *shf_reopen  ARGS((int fd, int sflags, struct shf *shf));
     62 struct shf *shf_sopen	ARGS((char *buf, int bsize, int sflags,
     63 			      struct shf *shf));
     64 int	    shf_close	ARGS((struct shf *shf));
     65 int	    shf_fdclose	ARGS((struct shf *shf));
     66 char	   *shf_sclose	ARGS((struct shf *shf));
     67 int	    shf_finish	ARGS((struct shf *shf));
     68 int	    shf_flush	ARGS((struct shf *shf));
     69 int	    shf_seek	ARGS((struct shf *shf, off_t where, int from));
     70 int	    shf_read	ARGS((char *buf, int bsize, struct shf *shf));
     71 char	   *shf_getse	ARGS((char *buf, int bsize, struct shf *shf));
     72 int	    shf_getchar	ARGS((struct shf *shf));
     73 int	    shf_ungetc	ARGS((int c, struct shf *shf));
     74 int	    shf_putchar	ARGS((int c, struct shf *shf));
     75 int	    shf_puts	ARGS((const char *s, struct shf *shf));
     76 int	    shf_write	ARGS((const char *buf, int nbytes, struct shf *shf));
     77 int	    shf_fprintf ARGS((struct shf *shf, const char *fmt, ...));
     78 int	    shf_snprintf ARGS((char *buf, int bsize, const char *fmt, ...));
     79 char	    *shf_smprintf ARGS((const char *fmt, ...));
     80 int	    shf_vfprintf ARGS((struct shf *, const char *fmt, va_list args));
     81