2 * Copyright (c) 2000-2002 Sendmail, Inc. and its suppliers.
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
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.
14 * $Id: io.h,v 1.23 2002/02/23 19:32:17 gshapiro Exp $
18 * @(#)stdio.h 5.17 (Berkeley) 6/3/91
26 #include <sm/varargs.h>
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 */
36 /* for sm_io_fseek, et al api's (exposed) */
37 #define SM_IO_SEEK_SET 0
38 #define SM_IO_SEEK_CUR 1
39 #define SM_IO_SEEK_END 2
41 /* flags for info what's with different types (exposed) */
42 #define SM_IO_WHAT_MODE 1
43 #define SM_IO_WHAT_VECTORS 2
44 #define SM_IO_WHAT_FD 3
45 #define SM_IO_WHAT_TYPE 4
46 #define SM_IO_WHAT_ISTYPE 5
47 #define SM_IO_IS_READABLE 6
48 #define SM_IO_WHAT_TIMEOUT 7
49 #define SM_IO_WHAT_SIZE 8
51 /* info flags (exposed) */
52 #define SM_IO_FTYPE_CREATE 1
53 #define SM_IO_FTYPE_MODIFY 2
54 #define SM_IO_FTYPE_DELETE 3
56 #define SM_IO_SL_PRIO 1
58 #define SM_IO_OPEN_MAX 20
60 /* for internal buffers */
63 unsigned char *smb_base;
68 ** sm I/O state variables (internal only).
70 ** The following always hold:
72 ** if (flags&(SMLBF|SMWR)) == (SMLBF|SMWR),
73 ** lbfsize is -bf.size, else lbfsize is 0
74 ** if flags&SMRD, w is 0
75 ** if flags&SMWR, r is 0
77 ** This ensures that the getc and putc macros (or inline functions) never
78 ** try to write or read from a file that is in `read' or `write' mode.
79 ** (Moreover, they can, and do, automatically switch from read mode to
80 ** write mode, and back, on "r+" and "w+" files.)
82 ** lbfsize is used only to make the inline line-buffered output stream
83 ** code as compact as possible.
85 ** ub, up, and ur are used when ungetc() pushes back more characters
86 ** than fit in the current bf, or when ungetc() pushes back a character
87 ** that does not match the previous one in bf. When this happens,
88 ** ub.base becomes non-nil (i.e., a stream has ungetc() data iff
89 ** ub.base!=NULL) and up and ur save the current values of p and r.
92 typedef struct sm_file SM_FILE_T;
96 const char *sm_magic; /* This SM_FILE_T is free when NULL */
97 unsigned char *f_p; /* current position in (some) buffer */
98 int f_r; /* read space left for getc() */
99 int f_w; /* write space left for putc() */
100 long f_flags; /* flags, below */
101 short f_file; /* fileno, if Unix fd, else -1 */
102 struct smbuf f_bf; /* the buffer (>= 1 byte, if !NULL) */
103 int f_lbfsize; /* 0 or -bf.size, for inline putc */
105 /* These can be used for any purpose by a file type implementation: */
110 int (*f_close) __P((SM_FILE_T *));
111 ssize_t (*f_read) __P((SM_FILE_T *, char *, size_t));
112 off_t (*f_seek) __P((SM_FILE_T *, off_t, int));
113 ssize_t (*f_write) __P((SM_FILE_T *, const char *, size_t));
114 int (*f_open) __P((SM_FILE_T *, const void *, int,
116 int (*f_setinfo) __P((SM_FILE_T *, int , void *));
117 int (*f_getinfo) __P((SM_FILE_T *, int , void *));
119 int f_timeoutstate; /* either blocking or non-blocking */
120 char *f_type; /* for by-type lookups */
121 struct sm_file *f_flushfp; /* flush this before reading parent */
122 struct sm_file *f_modefp; /* sync mode with this fp */
124 /* separate buffer for long sequences of ungetc() */
125 struct smbuf f_ub; /* ungetc buffer */
126 unsigned char *f_up; /* saved f_p when f_p is doing ungetc */
127 int f_ur; /* saved f_r when f_r is counting ungetc */
129 /* tricks to meet minimum requirements even when malloc() fails */
130 unsigned char f_ubuf[3]; /* guarantee an ungetc() buffer */
131 unsigned char f_nbuf[1]; /* guarantee a getc() buffer */
133 /* Unix stdio files get aligned to block boundaries on fseek() */
134 int f_blksize; /* stat.st_blksize (may be != bf.size) */
135 off_t f_lseekoff; /* current lseek offset */
136 int f_dup_cnt; /* count file dup'd */
140 extern SM_FILE_T SmIoF[];
141 extern const char SmFileMagic[];
142 extern SM_FILE_T SmFtStdio_def;
143 extern SM_FILE_T SmFtStdiofd_def;
144 extern SM_FILE_T SmFtString_def;
145 extern SM_FILE_T SmFtSyslog_def;
146 extern SM_FILE_T SmFtRealStdio_def;
148 #define SMIOIN_FILENO 0
149 #define SMIOOUT_FILENO 1
150 #define SMIOERR_FILENO 2
151 #define SMIOSTDIN_FILENO 3
152 #define SMIOSTDOUT_FILENO 4
153 #define SMIOSTDERR_FILENO 5
155 /* Common predefined and already (usually) open files (exposed) */
156 #define smioin (&SmIoF[SMIOIN_FILENO])
157 #define smioout (&SmIoF[SMIOOUT_FILENO])
158 #define smioerr (&SmIoF[SMIOERR_FILENO])
159 #define smiostdin (&SmIoF[SMIOSTDIN_FILENO])
160 #define smiostdout (&SmIoF[SMIOSTDOUT_FILENO])
161 #define smiostderr (&SmIoF[SMIOSTDERR_FILENO])
163 #define SmFtStdio (&SmFtStdio_def)
164 #define SmFtStdiofd (&SmFtStdiofd_def)
165 #define SmFtString (&SmFtString_def)
166 #define SmFtSyslog (&SmFtSyslog_def)
167 #define SmFtRealStdio (&SmFtRealStdio_def)
170 # define SM_IO_SET_TYPE(f, name, open, close, read, write, seek, get, set, timeout) \
171 (f) = {SmFileMagic, (unsigned char *) 0, 0, 0, 0L, -1, {0}, 0, (void *) 0,\
172 0, (close), (read), (seek), (write), (open), (set), (get), (timeout),\
174 # define SM_IO_INIT_TYPE(f, name, open, close, read, write, seek, get, set, timeout)
177 # define SM_IO_SET_TYPE(f, name, open, close, read, write, seek, get, set, timeout) (f)
178 # define SM_IO_INIT_TYPE(f, name, open, close, read, write, seek, get, set, timeout) \
179 (f).sm_magic = SmFileMagic; \
180 (f).f_p = (unsigned char *) 0; \
185 (f).f_bf.smb_base = (unsigned char *) 0; \
186 (f).f_bf.smb_size = 0; \
188 (f).f_cookie = (void *) 0; \
190 (f).f_close = (close); \
191 (f).f_read = (read); \
192 (f).f_seek = (seek); \
193 (f).f_write = (write); \
194 (f).f_open = (open); \
195 (f).f_setinfo = (set); \
196 (f).f_getinfo = (get); \
197 (f).f_timeout = (timeout); \
198 (f).f_timeoutstate = 0; \
201 #endif /* __STDC__ */
206 #define SMFBF 0x000001 /* XXXX fully buffered */
207 #define SMLBF 0x000002 /* line buffered */
208 #define SMNBF 0x000004 /* unbuffered */
209 #define SMNOW 0x000008 /* Flush each write; take read now */
210 #define SMRD 0x000010 /* OK to read */
211 #define SMWR 0x000020 /* OK to write */
212 /* RD and WR are never simultaneously asserted */
213 #define SMRW 0x000040 /* open for reading & writing */
214 #define SMFEOF 0x000080 /* found EOF */
215 #define SMERR 0x000100 /* found error */
216 #define SMMBF 0x000200 /* buf is from malloc */
217 #define SMAPP 0x000400 /* fdopen()ed in append mode */
218 #define SMSTR 0x000800 /* this is an snprintf string */
219 #define SMOPT 0x001000 /* do fseek() optimisation */
220 #define SMNPT 0x002000 /* do not do fseek() optimisation */
221 #define SMOFF 0x004000 /* set iff offset is in fact correct */
222 #define SMALC 0x010000 /* allocate string space dynamically */
224 #define SMMODEMASK 0x0070 /* read/write mode */
226 /* defines for timeout constants */
227 #define SM_TIME_IMMEDIATE (0)
228 #define SM_TIME_FOREVER (-1)
229 #define SM_TIME_DEFAULT (-2)
231 /* timeout state for blocking */
232 #define SM_TIME_BLOCK (0) /* XXX just bool? */
233 #define SM_TIME_NONBLOCK (1)
235 /* Exposed buffering type flags */
236 #define SM_IO_FBF 0 /* setvbuf should set fully buffered */
237 #define SM_IO_LBF 1 /* setvbuf should set line buffered */
238 #define SM_IO_NBF 2 /* setvbuf should set unbuffered */
240 /* setvbuf buffered, but through at lower file type layers */
244 ** size of buffer used by setbuf.
245 ** If underlying filesystem blocksize is discoverable that is used instead
248 #define SM_IO_BUFSIZ 4096
250 #define SM_IO_EOF (-1)
252 /* Functions defined in ANSI C standard. */
254 SM_FILE_T *sm_io_autoflush __P((SM_FILE_T *, SM_FILE_T *));
255 void sm_io_automode __P((SM_FILE_T *, SM_FILE_T *));
256 void sm_io_clearerr __P((SM_FILE_T *));
257 int sm_io_close __P((SM_FILE_T *, int SM_NONVOLATILE));
258 SM_FILE_T *sm_io_dup __P((SM_FILE_T *));
259 int sm_io_eof __P((SM_FILE_T *));
260 int sm_io_error __P((SM_FILE_T *));
261 char *sm_io_fgets __P((SM_FILE_T *, int, char *, int));
262 int sm_io_flush __P((SM_FILE_T *, int SM_NONVOLATILE));
265 sm_io_fprintf __P((SM_FILE_T *, int, const char *, ...));
267 int sm_io_fputs __P((SM_FILE_T *, int, const char *));
270 sm_io_fscanf __P((SM_FILE_T *, int, const char *, ...));
272 int sm_io_getc __P((SM_FILE_T *, int));
273 int sm_io_getinfo __P((SM_FILE_T *, int, void *));
274 SM_FILE_T *sm_io_open __P((const SM_FILE_T *, int SM_NONVOLATILE, const void *,
276 int sm_io_purge __P((SM_FILE_T *));
277 int sm_io_putc __P((SM_FILE_T *, int, int));
278 size_t sm_io_read __P((SM_FILE_T *, int, void *, size_t));
279 SM_FILE_T *sm_io_reopen __P((const SM_FILE_T *, int SM_NONVOLATILE,
280 const void *, int, const void *, SM_FILE_T *));
281 void sm_io_rewind __P((SM_FILE_T *, int));
282 int sm_io_seek __P((SM_FILE_T *, int SM_NONVOLATILE, long SM_NONVOLATILE,
283 int SM_NONVOLATILE));
284 int sm_io_setinfo __P((SM_FILE_T *, int, void *));
285 int sm_io_setvbuf __P((SM_FILE_T *, int, char *, int, size_t));
288 sm_io_sscanf __P((const char *, char const *, ...));
290 long sm_io_tell __P((SM_FILE_T *, int SM_NONVOLATILE));
291 int sm_io_ungetc __P((SM_FILE_T *, int, int));
292 int sm_io_vfprintf __P((SM_FILE_T *, int, const char *, va_list));
293 size_t sm_io_write __P((SM_FILE_T *, int, const void *, size_t));
295 void sm_strio_init __P((SM_FILE_T *, char *, size_t));
304 sm_io_stdioopen __P((
328 ** Functions internal to the implementation.
332 int sm_rget __P((SM_FILE_T *, int));
333 int sm_vfscanf __P((SM_FILE_T *, int SM_NONVOLATILE, const char *,
334 va_list SM_NONVOLATILE));
335 int sm_wbuf __P((SM_FILE_T *, int, int));
339 ** The macros are here so that we can
340 ** define function versions in the library.
343 #define sm_getc(f, t) \
349 ** This has been tuned to generate reasonable code on the vax using pcc.
350 ** (It also generates reasonable x86 code using gcc.)
353 #define sm_putc(f, t, c) \
355 (f)->f_w >= (f)->f_lbfsize ? \
356 (*(f)->f_p = (c)), *(f)->f_p != '\n' ? \
358 sm_wbuf(f, t, '\n') : \
359 sm_wbuf(f, t, (int)(c)) : \
360 (*(f)->f_p = (c), (int)*(f)->f_p++))
362 #define sm_eof(p) (((p)->f_flags & SMFEOF) != 0)
363 #define sm_error(p) (((p)->f_flags & SMERR) != 0)
364 #define sm_clearerr(p) ((void)((p)->f_flags &= ~(SMERR|SMFEOF)))
366 #define sm_io_eof(p) sm_eof(p)
367 #define sm_io_error(p) sm_error(p)
369 #define sm_io_clearerr(p) sm_clearerr(p)
372 # ifndef _POSIX_SOURCE
373 # define sm_io_getc(fp, t) sm_getc(fp, t)
374 # define sm_io_putc(fp, t, x) sm_putc(fp, t, x)
375 # endif /* _POSIX_SOURCE */