shf.h

   1 #ifndef SHF_H
   2 # define SHF_H
   3
   4 /*
   5  * Shell file I/O routines
   6  */
   7 /* $Id$ */
   8
   9 #define SHF_BSIZE       512
  10
  11 #define shf_fileno(shf) ((shf)->fd)
  12 #define shf_setfileno(shf,nfd)  ((shf)->fd = (nfd))
  13 #define shf_getc(shf) ((shf)->rnleft > 0 ? (shf)->rnleft--, *(shf)->rp++ : \
  14                         shf_getchar(shf))
  15 #define shf_putc(c, shf)        ((shf)->wnleft == 0 ? shf_putchar((c), (shf)) \
  16                                         : ((shf)->wnleft--, *(shf)->wp++ = (c)))
  17 #define shf_eof(shf)            ((shf)->flags & SHF_EOF)
  18 #define shf_error(shf)          ((shf)->flags & SHF_ERROR)
  19 #define shf_errno(shf)          ((shf)->errno_)
  20 #define shf_clearerr(shf)       ((shf)->flags &= ~(SHF_EOF | SHF_ERROR))
  21
  22 /* Flags passed to shf_*open() */
  23 #define SHF_RD          0x0001
  24 #define SHF_WR          0x0002
  25 #define SHF_RDWR          (SHF_RD|SHF_WR)
  26 #define SHF_ACCMODE       0x0003        /* mask */
  27 #define SHF_GETFL       0x0004          /* use fcntl() to figure RD/WR flags */
  28 #define SHF_UNBUF       0x0008          /* unbuffered I/O */
  29 #define SHF_CLEXEC      0x0010          /* set close on exec flag */
  30 #define SHF_MAPHI       0x0020          /* make fd > FDBASE (and close orig)
  31                                          * (shf_open() only) */
  32 #define SHF_DYNAMIC     0x0040          /* string: increase buffer as needed */
  33 #define SHF_INTERRUPT   0x0080          /* EINTR in read/write causes error */
  34 /* Flags used internally */
  35 #define SHF_STRING      0x0100          /* a string, not a file */
  36 #define SHF_ALLOCS      0x0200          /* shf and shf->buf were alloc()ed */
  37 #define SHF_ALLOCB      0x0400          /* shf->buf was alloc()ed */
  38 #define SHF_ERROR       0x0800          /* read()/write() error */
  39 #define SHF_EOF         0x1000          /* read eof (sticky) */
  40 #define SHF_READING     0x2000          /* currently reading: rnleft,rp valid */
  41 #define SHF_WRITING     0x4000          /* currently writing: wnleft,wp valid */
  42
  43
  44 struct shf {
  45         int flags;              /* see SHF_* */
  46         unsigned char *rp;      /* read: current position in buffer */
  47         int rbsize;             /* size of buffer (1 if SHF_UNBUF) */
  48         int rnleft;             /* read: how much data left in buffer */
  49         unsigned char *wp;      /* write: current position in buffer */
  50         int wbsize;             /* size of buffer (0 if SHF_UNBUF) */
  51         int wnleft;             /* write: how much space left in buffer */
  52         unsigned char *buf;     /* buffer */
  53         int fd;                 /* file descriptor */
  54         int errno_;             /* saved value of errno after error */
  55         int bsize;              /* actual size of buf */
  56         Area *areap;            /* area shf/buf were allocated in */
  57 };
  58
  59 extern struct shf shf_iob[];
  60
  61 struct shf *shf_open    ARGS((const char *name, int oflags, int mode,
  62                               int sflags));
  63 struct shf *shf_fdopen  ARGS((int fd, int sflags, struct shf *shf));
  64 struct shf *shf_reopen  ARGS((int fd, int sflags, struct shf *shf));
  65 struct shf *shf_sopen   ARGS((char *buf, int bsize, int sflags,
  66                               struct shf *shf));
  67 int         shf_close   ARGS((struct shf *shf));
  68 int         shf_fdclose ARGS((struct shf *shf));
  69 char       *shf_sclose  ARGS((struct shf *shf));
  70 int         shf_finish  ARGS((struct shf *shf));
  71 int         shf_flush   ARGS((struct shf *shf));
  72 int         shf_seek    ARGS((struct shf *shf, off_t where, int from));
  73 int         shf_read    ARGS((char *buf, int bsize, struct shf *shf));
  74 char       *shf_getse   ARGS((char *buf, int bsize, struct shf *shf));
  75 int         shf_getchar ARGS((struct shf *shf));
  76 int         shf_ungetc  ARGS((int c, struct shf *shf));
  77 int         shf_putchar ARGS((int c, struct shf *shf));
  78 int         shf_puts    ARGS((const char *s, struct shf *shf));
  79 int         shf_write   ARGS((const char *buf, int nbytes, struct shf *shf));
  80 int         shf_fprintf ARGS((struct shf *shf, const char *fmt, ...));
  81 int         shf_snprintf ARGS((char *buf, int bsize, const char *fmt, ...));
  82 char        *shf_smprintf ARGS((const char *fmt, ...));
  83 int         shf_vfprintf ARGS((struct shf *, const char *fmt, va_list args));
  84
  85 #endif /* SHF_H */