contrib/sendmail-8.13.7/include/sm/io.h

   1 /*
   2  * Copyright (c) 2000-2002, 2004 Sendmail, Inc. and its suppliers.
   3  *      All rights reserved.
   4  * Copyright (c) 1990
   5  *       The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Chris Torek.
   9  *
  10  * By using this file, you agree to the terms and conditions set
  11  * forth in the LICENSE file which can be found at the top level of
  12  * the sendmail distribution.
  13  *
  14  *      $Id: io.h,v 1.24 2004/03/03 19:14:49 ca Exp $
  15  */
  16
  17 /*-
  18  *      @(#)stdio.h     5.17 (Berkeley) 6/3/91
  19  */
  20
  21 #ifndef SM_IO_H
  22 #define SM_IO_H
  23
  24 #include <stdio.h>
  25 #include <sm/gen.h>
  26 #include <sm/varargs.h>
  27
  28 /* mode for sm io (exposed) */
  29 #define SM_IO_RDWR      1       /* read-write */
  30 #define SM_IO_RDONLY    2       /* read-only */
  31 #define SM_IO_WRONLY    3       /* write-only */
  32 #define SM_IO_APPEND    4       /* write-only from eof */
  33 #define SM_IO_APPENDRW  5       /* read-write from eof */
  34 #define SM_IO_RDWRTR    6       /* read-write with truncation indicated */
  35
  36 # define SM_IO_BINARY   0x0     /* binary mode: not used in Unix */
  37 #define SM_IS_BINARY(mode)      (((mode) & SM_IO_BINARY) != 0)
  38 #define SM_IO_MODE(mode)        ((mode) & 0x0f)
  39
  40 #define SM_IO_RDWR_B    (SM_IO_RDWR|SM_IO_BINARY)
  41 #define SM_IO_RDONLY_B  (SM_IO_RDONLY|SM_IO_BINARY)
  42 #define SM_IO_WRONLY_B  (SM_IO_WRONLY|SM_IO_BINARY)
  43 #define SM_IO_APPEND_B  (SM_IO_APPEND|SM_IO_BINARY)
  44 #define SM_IO_APPENDRW_B        (SM_IO_APPENDRW|SM_IO_BINARY)
  45 #define SM_IO_RDWRTR_B  (SM_IO_RDWRTR|SM_IO_BINARY)
  46
  47 /* for sm_io_fseek, et al api's (exposed) */
  48 #define SM_IO_SEEK_SET  0
  49 #define SM_IO_SEEK_CUR  1
  50 #define SM_IO_SEEK_END  2
  51
  52 /* flags for info what's with different types (exposed) */
  53 #define SM_IO_WHAT_MODE         1
  54 #define SM_IO_WHAT_VECTORS      2
  55 #define SM_IO_WHAT_FD           3
  56 #define SM_IO_WHAT_TYPE         4
  57 #define SM_IO_WHAT_ISTYPE       5
  58 #define SM_IO_IS_READABLE       6
  59 #define SM_IO_WHAT_TIMEOUT      7
  60 #define SM_IO_WHAT_SIZE         8
  61
  62 /* info flags (exposed) */
  63 #define SM_IO_FTYPE_CREATE      1
  64 #define SM_IO_FTYPE_MODIFY      2
  65 #define SM_IO_FTYPE_DELETE      3
  66
  67 #define SM_IO_SL_PRIO           1
  68
  69 #define SM_IO_OPEN_MAX          20
  70
  71 /* for internal buffers */
  72 struct smbuf
  73 {
  74         unsigned char   *smb_base;
  75         int             smb_size;
  76 };
  77
  78 /*
  79 **  sm I/O state variables (internal only).
  80 **
  81 **      The following always hold:
  82 **
  83 **              if (flags&(SMLBF|SMWR)) == (SMLBF|SMWR),
  84 **                      lbfsize is -bf.size, else lbfsize is 0
  85 **              if flags&SMRD, w is 0
  86 **              if flags&SMWR, r is 0
  87 **
  88 **      This ensures that the getc and putc macros (or inline functions) never
  89 **      try to write or read from a file that is in `read' or `write' mode.
  90 **      (Moreover, they can, and do, automatically switch from read mode to
  91 **      write mode, and back, on "r+" and "w+" files.)
  92 **
  93 **      lbfsize is used only to make the inline line-buffered output stream
  94 **      code as compact as possible.
  95 **
  96 **      ub, up, and ur are used when ungetc() pushes back more characters
  97 **      than fit in the current bf, or when ungetc() pushes back a character
  98 **      that does not match the previous one in bf.  When this happens,
  99 **      ub.base becomes non-nil (i.e., a stream has ungetc() data iff
 100 **      ub.base!=NULL) and up and ur save the current values of p and r.
 101 */
 102
 103 typedef struct sm_file SM_FILE_T;
 104
 105 struct sm_file
 106 {
 107         const char      *sm_magic;      /* This SM_FILE_T is free when NULL */
 108         unsigned char   *f_p;           /* current position in (some) buffer */
 109         int             f_r;            /* read space left for getc() */
 110         int             f_w;            /* write space left for putc() */
 111         long            f_flags;        /* flags, below */
 112         short           f_file;         /* fileno, if Unix fd, else -1 */
 113         struct smbuf    f_bf;           /* the buffer (>= 1 byte, if !NULL) */
 114         int             f_lbfsize;      /* 0 or -bf.size, for inline putc */
 115
 116         /* These can be used for any purpose by a file type implementation: */
 117         void            *f_cookie;
 118         int             f_ival;
 119
 120         /* operations */
 121         int             (*f_close) __P((SM_FILE_T *));
 122         ssize_t         (*f_read)  __P((SM_FILE_T *, char *, size_t));
 123         off_t           (*f_seek)  __P((SM_FILE_T *, off_t, int));
 124         ssize_t         (*f_write) __P((SM_FILE_T *, const char *, size_t));
 125         int             (*f_open) __P((SM_FILE_T *, const void *, int,
 126                                         const void *));
 127         int             (*f_setinfo) __P((SM_FILE_T *, int , void *));
 128         int             (*f_getinfo) __P((SM_FILE_T *, int , void *));
 129         int             f_timeout;
 130         int             f_timeoutstate;   /* either blocking or non-blocking */
 131         char            *f_type;        /* for by-type lookups */
 132         struct sm_file  *f_flushfp;     /* flush this before reading parent */
 133         struct sm_file  *f_modefp;      /* sync mode with this fp */
 134
 135         /* separate buffer for long sequences of ungetc() */
 136         struct smbuf    f_ub;   /* ungetc buffer */
 137         unsigned char   *f_up;  /* saved f_p when f_p is doing ungetc */
 138         int             f_ur;   /* saved f_r when f_r is counting ungetc */
 139
 140         /* tricks to meet minimum requirements even when malloc() fails */
 141         unsigned char   f_ubuf[3];      /* guarantee an ungetc() buffer */
 142         unsigned char   f_nbuf[1];      /* guarantee a getc() buffer */
 143
 144         /* Unix stdio files get aligned to block boundaries on fseek() */
 145         int             f_blksize;      /* stat.st_blksize (may be != bf.size) */
 146         off_t           f_lseekoff;     /* current lseek offset */
 147         int             f_dup_cnt;      /* count file dup'd */
 148 };
 149
 150 __BEGIN_DECLS
 151 extern SM_FILE_T        SmIoF[];
 152 extern const char       SmFileMagic[];
 153 extern SM_FILE_T        SmFtStdio_def;
 154 extern SM_FILE_T        SmFtStdiofd_def;
 155 extern SM_FILE_T        SmFtString_def;
 156 extern SM_FILE_T        SmFtSyslog_def;
 157 extern SM_FILE_T        SmFtRealStdio_def;
 158
 159 #define SMIOIN_FILENO           0
 160 #define SMIOOUT_FILENO          1
 161 #define SMIOERR_FILENO          2
 162 #define SMIOSTDIN_FILENO        3
 163 #define SMIOSTDOUT_FILENO       4
 164 #define SMIOSTDERR_FILENO       5
 165
 166 /* Common predefined and already (usually) open files (exposed) */
 167 #define smioin          (&SmIoF[SMIOIN_FILENO])
 168 #define smioout         (&SmIoF[SMIOOUT_FILENO])
 169 #define smioerr         (&SmIoF[SMIOERR_FILENO])
 170 #define smiostdin       (&SmIoF[SMIOSTDIN_FILENO])
 171 #define smiostdout      (&SmIoF[SMIOSTDOUT_FILENO])
 172 #define smiostderr      (&SmIoF[SMIOSTDERR_FILENO])
 173
 174 #define SmFtStdio       (&SmFtStdio_def)
 175 #define SmFtStdiofd     (&SmFtStdiofd_def)
 176 #define SmFtString      (&SmFtString_def)
 177 #define SmFtSyslog      (&SmFtSyslog_def)
 178 #define SmFtRealStdio   (&SmFtRealStdio_def)
 179
 180 #ifdef __STDC__
 181 # define SM_IO_SET_TYPE(f, name, open, close, read, write, seek, get, set, timeout) \
 182     (f) = {SmFileMagic, (unsigned char *) 0, 0, 0, 0L, -1, {0}, 0, (void *) 0,\
 183         0, (close), (read), (seek), (write), (open), (set), (get), (timeout),\
 184         0, (name)}
 185 # define SM_IO_INIT_TYPE(f, name, open, close, read, write, seek, get, set, timeout)
 186
 187 #else /* __STDC__ */
 188 # define SM_IO_SET_TYPE(f, name, open, close, read, write, seek, get, set, timeout) (f)
 189 # define SM_IO_INIT_TYPE(f, name, open, close, read, write, seek, get, set, timeout) \
 190         (f).sm_magic = SmFileMagic;     \
 191         (f).f_p = (unsigned char *) 0;  \
 192         (f).f_r = 0;    \
 193         (f).f_w = 0;    \
 194         (f).f_flags = 0L;       \
 195         (f).f_file = 0; \
 196         (f).f_bf.smb_base = (unsigned char *) 0;        \
 197         (f).f_bf.smb_size = 0;  \
 198         (f).f_lbfsize = 0;      \
 199         (f).f_cookie = (void *) 0;      \
 200         (f).f_ival = 0; \
 201         (f).f_close = (close);  \
 202         (f).f_read = (read);    \
 203         (f).f_seek = (seek);    \
 204         (f).f_write = (write);  \
 205         (f).f_open = (open);    \
 206         (f).f_setinfo = (set);  \
 207         (f).f_getinfo = (get);  \
 208         (f).f_timeout = (timeout);      \
 209         (f).f_timeoutstate = 0; \
 210         (f).f_type = (name);
 211
 212 #endif /* __STDC__ */
 213
 214 __END_DECLS
 215
 216 /* Internal flags */
 217 #define SMFBF           0x000001        /* XXXX fully buffered */
 218 #define SMLBF           0x000002        /* line buffered */
 219 #define SMNBF           0x000004        /* unbuffered */
 220 #define SMNOW           0x000008        /* Flush each write; take read now */
 221 #define SMRD            0x000010        /* OK to read */
 222 #define SMWR            0x000020        /* OK to write */
 223         /* RD and WR are never simultaneously asserted */
 224 #define SMRW            0x000040        /* open for reading & writing */
 225 #define SMFEOF          0x000080        /* found EOF */
 226 #define SMERR           0x000100        /* found error */
 227 #define SMMBF           0x000200        /* buf is from malloc */
 228 #define SMAPP           0x000400        /* fdopen()ed in append mode */
 229 #define SMSTR           0x000800        /* this is an snprintf string */
 230 #define SMOPT           0x001000        /* do fseek() optimisation */
 231 #define SMNPT           0x002000        /* do not do fseek() optimisation */
 232 #define SMOFF           0x004000        /* set iff offset is in fact correct */
 233 #define SMALC           0x010000        /* allocate string space dynamically */
 234
 235 #define SMMODEMASK      0x0070  /* read/write mode */
 236
 237 /* defines for timeout constants */
 238 #define SM_TIME_IMMEDIATE       (0)
 239 #define SM_TIME_FOREVER         (-1)
 240 #define SM_TIME_DEFAULT         (-2)
 241
 242 /* timeout state for blocking */
 243 #define SM_TIME_BLOCK           (0)     /* XXX just bool? */
 244 #define SM_TIME_NONBLOCK        (1)
 245
 246 /* Exposed buffering type flags */
 247 #define SM_IO_FBF       0       /* setvbuf should set fully buffered */
 248 #define SM_IO_LBF       1       /* setvbuf should set line buffered */
 249 #define SM_IO_NBF       2       /* setvbuf should set unbuffered */
 250
 251 /* setvbuf buffered, but through at lower file type layers */
 252 #define SM_IO_NOW       3
 253
 254 /*
 255 **  size of buffer used by setbuf.
 256 **  If underlying filesystem blocksize is discoverable that is used instead
 257 */
 258
 259 #define SM_IO_BUFSIZ    4096
 260
 261 #define SM_IO_EOF       (-1)
 262
 263 /* Functions defined in ANSI C standard.  */
 264 __BEGIN_DECLS
 265 SM_FILE_T *sm_io_autoflush __P((SM_FILE_T *, SM_FILE_T *));
 266 void     sm_io_automode __P((SM_FILE_T *, SM_FILE_T *));
 267 void     sm_io_clearerr __P((SM_FILE_T *));
 268 int      sm_io_close __P((SM_FILE_T *, int SM_NONVOLATILE));
 269 SM_FILE_T *sm_io_dup __P((SM_FILE_T *));
 270 int      sm_io_eof __P((SM_FILE_T *));
 271 int      sm_io_error __P((SM_FILE_T *));
 272 char    *sm_io_fgets __P((SM_FILE_T *, int, char *, int));
 273 int      sm_io_flush __P((SM_FILE_T *, int SM_NONVOLATILE));
 274
 275 int PRINTFLIKE(3, 4)
 276 sm_io_fprintf __P((SM_FILE_T *, int, const char *, ...));
 277
 278 int      sm_io_fputs __P((SM_FILE_T *, int, const char *));
 279
 280 int SCANFLIKE(3, 4)
 281 sm_io_fscanf __P((SM_FILE_T *, int, const char *, ...));
 282
 283 int      sm_io_getc __P((SM_FILE_T *, int));
 284 int      sm_io_getinfo __P((SM_FILE_T *, int, void *));
 285 SM_FILE_T *sm_io_open __P((const SM_FILE_T *, int SM_NONVOLATILE, const void *,
 286                            int, const void *));
 287 int      sm_io_purge __P((SM_FILE_T *));
 288 int      sm_io_putc __P((SM_FILE_T *, int, int));
 289 size_t   sm_io_read __P((SM_FILE_T *, int, void *, size_t));
 290 SM_FILE_T *sm_io_reopen __P((const SM_FILE_T *, int SM_NONVOLATILE,
 291                              const void *, int, const void *, SM_FILE_T *));
 292 void     sm_io_rewind __P((SM_FILE_T *, int));
 293 int      sm_io_seek __P((SM_FILE_T *, int SM_NONVOLATILE, long SM_NONVOLATILE,
 294                          int SM_NONVOLATILE));
 295 int      sm_io_setinfo __P((SM_FILE_T *, int, void *));
 296 int      sm_io_setvbuf __P((SM_FILE_T *, int, char *, int, size_t));
 297
 298 int SCANFLIKE(2, 3)
 299 sm_io_sscanf __P((const char *, char const *, ...));
 300
 301 long     sm_io_tell __P((SM_FILE_T *, int SM_NONVOLATILE));
 302 int      sm_io_ungetc __P((SM_FILE_T *, int, int));
 303 int      sm_io_vfprintf __P((SM_FILE_T *, int, const char *, va_list));
 304 size_t   sm_io_write __P((SM_FILE_T *, int, const void *, size_t));
 305
 306 void     sm_strio_init __P((SM_FILE_T *, char *, size_t));
 307
 308 extern SM_FILE_T *
 309 sm_io_fopen __P((
 310         char *_pathname,
 311         int _flags,
 312         ...));
 313
 314 extern SM_FILE_T *
 315 sm_io_stdioopen __P((
 316         FILE *_stream,
 317         char *_mode));
 318
 319 extern int
 320 sm_vasprintf __P((
 321         char **_str,
 322         const char *_fmt,
 323         va_list _ap));
 324
 325 extern int
 326 sm_vsnprintf __P((
 327         char *,
 328         size_t,
 329         const char *,
 330         va_list));
 331
 332 extern void
 333 sm_perror __P((
 334         const char *));
 335
 336 __END_DECLS
 337
 338 /*
 339 ** Functions internal to the implementation.
 340 */
 341
 342 __BEGIN_DECLS
 343 int     sm_rget __P((SM_FILE_T *, int));
 344 int     sm_vfscanf __P((SM_FILE_T *, int SM_NONVOLATILE, const char *,
 345                         va_list SM_NONVOLATILE));
 346 int     sm_wbuf __P((SM_FILE_T *, int, int));
 347 __END_DECLS
 348
 349 /*
 350 **  The macros are here so that we can
 351 **  define function versions in the library.
 352 */
 353
 354 #define sm_getc(f, t) \
 355         (--(f)->f_r < 0 ? \
 356                 sm_rget(f, t) : \
 357                 (int)(*(f)->f_p++))
 358
 359 /*
 360 **  This has been tuned to generate reasonable code on the vax using pcc.
 361 **  (It also generates reasonable x86 code using gcc.)
 362 */
 363
 364 #define sm_putc(f, t, c) \
 365         (--(f)->f_w < 0 ? \
 366                 (f)->f_w >= (f)->f_lbfsize ? \
 367                         (*(f)->f_p = (c)), *(f)->f_p != '\n' ? \
 368                                 (int)*(f)->f_p++ : \
 369                                 sm_wbuf(f, t, '\n') : \
 370                         sm_wbuf(f, t, (int)(c)) : \
 371                 (*(f)->f_p = (c), (int)*(f)->f_p++))
 372
 373 #define sm_eof(p)       (((p)->f_flags & SMFEOF) != 0)
 374 #define sm_error(p)     (((p)->f_flags & SMERR) != 0)
 375 #define sm_clearerr(p)  ((void)((p)->f_flags &= ~(SMERR|SMFEOF)))
 376
 377 #define sm_io_eof(p)    sm_eof(p)
 378 #define sm_io_error(p)  sm_error(p)
 379
 380 #define sm_io_clearerr(p)       sm_clearerr(p)
 381
 382 #ifndef lint
 383 # ifndef _POSIX_SOURCE
 384 #  define sm_io_getc(fp, t)     sm_getc(fp, t)
 385 #  define sm_io_putc(fp, t, x)  sm_putc(fp, t, x)
 386 # endif /* _POSIX_SOURCE */
 387 #endif /* lint */
 388
 389 #endif /* SM_IO_H */