stdio.h revision 1.16
1 /* $NetBSD: stdio.h,v 1.16 1995/03/25 02:51:02 jtc Exp $ */ 2 3 /*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Chris Torek. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)stdio.h 5.17 (Berkeley) 6/3/91 39 */ 40 41 #ifndef _STDIO_H_ 42 #define _STDIO_H_ 43 44 #if !defined(_ANSI_SOURCE) && !defined(__STRICT_ANSI_) 45 #include <sys/types.h> 46 #endif 47 48 #include <sys/cdefs.h> 49 50 #include <machine/ansi.h> 51 #ifdef _BSD_SIZE_T_ 52 typedef _BSD_SIZE_T_ size_t; 53 #undef _BSD_SIZE_T_ 54 #endif 55 56 #ifndef NULL 57 #define NULL 0 58 #endif 59 60 /* 61 * This is fairly grotesque, but pure ANSI code must not inspect the 62 * innards of an fpos_t anyway. The library internally uses off_t, 63 * which we assume is exactly as big as eight chars. 64 */ 65 #if !defined(_ANSI_SOURCE) && !defined(__STRICT_ANSI__) 66 typedef off_t fpos_t; 67 #else 68 typedef struct __sfpos { 69 long long _pos; /* XXX must be the same as off_t */ 70 } fpos_t; 71 #endif 72 73 #define _FSTDIO /* Define for new stdio with functions. */ 74 75 /* 76 * NB: to fit things in six character monocase externals, the stdio 77 * code uses the prefix `__s' for stdio objects, typically followed 78 * by a three-character attempt at a mnemonic. 79 */ 80 81 /* stdio buffers */ 82 struct __sbuf { 83 unsigned char *_base; 84 int _size; 85 }; 86 87 /* 88 * stdio state variables. 89 * 90 * The following always hold: 91 * 92 * if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR), 93 * _lbfsize is -_bf._size, else _lbfsize is 0 94 * if _flags&__SRD, _w is 0 95 * if _flags&__SWR, _r is 0 96 * 97 * This ensures that the getc and putc macros (or inline functions) never 98 * try to write or read from a file that is in `read' or `write' mode. 99 * (Moreover, they can, and do, automatically switch from read mode to 100 * write mode, and back, on "r+" and "w+" files.) 101 * 102 * _lbfsize is used only to make the inline line-buffered output stream 103 * code as compact as possible. 104 * 105 * _ub, _up, and _ur are used when ungetc() pushes back more characters 106 * than fit in the current _bf, or when ungetc() pushes back a character 107 * that does not match the previous one in _bf. When this happens, 108 * _ub._base becomes non-nil (i.e., a stream has ungetc() data iff 109 * _ub._base!=NULL) and _up and _ur save the current values of _p and _r. 110 */ 111 typedef struct __sFILE { 112 unsigned char *_p; /* current position in (some) buffer */ 113 int _r; /* read space left for getc() */ 114 int _w; /* write space left for putc() */ 115 short _flags; /* flags, below; this FILE is free if 0 */ 116 short _file; /* fileno, if Unix descriptor, else -1 */ 117 struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */ 118 int _lbfsize; /* 0 or -_bf._size, for inline putc */ 119 120 /* operations */ 121 void *_cookie; /* cookie passed to io functions */ 122 int (*_close) __P((void *)); 123 int (*_read) __P((void *, char *, int)); 124 fpos_t (*_seek) __P((void *, fpos_t, int)); 125 int (*_write) __P((void *, const char *, int)); 126 127 /* separate buffer for long sequences of ungetc() */ 128 struct __sbuf _ub; /* ungetc buffer */ 129 unsigned char *_up; /* saved _p when _p is doing ungetc data */ 130 int _ur; /* saved _r when _r is counting ungetc data */ 131 132 /* tricks to meet minimum requirements even when malloc() fails */ 133 unsigned char _ubuf[3]; /* guarantee an ungetc() buffer */ 134 unsigned char _nbuf[1]; /* guarantee a getc() buffer */ 135 136 /* separate buffer for fgetln() when line crosses buffer boundary */ 137 struct __sbuf _lb; /* buffer for fgetln() */ 138 139 /* Unix stdio files get aligned to block boundaries on fseek() */ 140 int _blksize; /* stat.st_blksize (may be != _bf._size) */ 141 fpos_t _offset; /* current lseek offset */ 142 } FILE; 143 144 __BEGIN_DECLS 145 extern FILE __sF[]; 146 __END_DECLS 147 148 #define __SLBF 0x0001 /* line buffered */ 149 #define __SNBF 0x0002 /* unbuffered */ 150 #define __SRD 0x0004 /* OK to read */ 151 #define __SWR 0x0008 /* OK to write */ 152 /* RD and WR are never simultaneously asserted */ 153 #define __SRW 0x0010 /* open for reading & writing */ 154 #define __SEOF 0x0020 /* found EOF */ 155 #define __SERR 0x0040 /* found error */ 156 #define __SMBF 0x0080 /* _buf is from malloc */ 157 #define __SAPP 0x0100 /* fdopen()ed in append mode */ 158 #define __SSTR 0x0200 /* this is an sprintf/snprintf string */ 159 #define __SOPT 0x0400 /* do fseek() optimisation */ 160 #define __SNPT 0x0800 /* do not do fseek() optimisation */ 161 #define __SOFF 0x1000 /* set iff _offset is in fact correct */ 162 #define __SMOD 0x2000 /* true => fgetln modified _p text */ 163 164 /* 165 * The following three definitions are for ANSI C, which took them 166 * from System V, which brilliantly took internal interface macros and 167 * made them official arguments to setvbuf(), without renaming them. 168 * Hence, these ugly _IOxxx names are *supposed* to appear in user code. 169 * 170 * Although numbered as their counterparts above, the implementation 171 * does not rely on this. 172 */ 173 #define _IOFBF 0 /* setvbuf should set fully buffered */ 174 #define _IOLBF 1 /* setvbuf should set line buffered */ 175 #define _IONBF 2 /* setvbuf should set unbuffered */ 176 177 #define BUFSIZ 1024 /* size of buffer used by setbuf */ 178 #define EOF (-1) 179 180 /* 181 * FOPEN_MAX is a minimum maximum, and should be the number of descriptors 182 * that the kernel can provide without allocation of a resource that can 183 * fail without the process sleeping. Do not use this for anything. 184 */ 185 #define FOPEN_MAX 20 /* must be <= OPEN_MAX <sys/syslimits.h> */ 186 #define FILENAME_MAX 1024 /* must be <= PATH_MAX <sys/syslimits.h> */ 187 188 /* System V/ANSI C; this is the wrong way to do this, do *not* use these. */ 189 #ifndef _ANSI_SOURCE 190 #define P_tmpdir "/var/tmp/" 191 #endif 192 #define L_tmpnam 1024 /* XXX must be == PATH_MAX */ 193 #define TMP_MAX 308915776 194 195 #ifndef SEEK_SET 196 #define SEEK_SET 0 /* set file offset to offset */ 197 #endif 198 #ifndef SEEK_CUR 199 #define SEEK_CUR 1 /* set file offset to current plus offset */ 200 #endif 201 #ifndef SEEK_END 202 #define SEEK_END 2 /* set file offset to EOF plus offset */ 203 #endif 204 205 #define stdin (&__sF[0]) 206 #define stdout (&__sF[1]) 207 #define stderr (&__sF[2]) 208 209 /* 210 * Functions defined in ANSI C standard. 211 */ 212 __BEGIN_DECLS 213 void clearerr __P((FILE *)); 214 int fclose __P((FILE *)); 215 int feof __P((FILE *)); 216 int ferror __P((FILE *)); 217 int fflush __P((FILE *)); 218 int fgetc __P((FILE *)); 219 int fgetpos __P((FILE *, fpos_t *)); 220 char *fgets __P((char *, int, FILE *)); 221 FILE *fopen __P((const char *, const char *)); 222 int fprintf __P((FILE *, const char *, ...)); 223 int fputc __P((int, FILE *)); 224 int fputs __P((const char *, FILE *)); 225 size_t fread __P((void *, size_t, size_t, FILE *)); 226 FILE *freopen __P((const char *, const char *, FILE *)); 227 int fscanf __P((FILE *, const char *, ...)); 228 int fseek __P((FILE *, long, int)); 229 int fsetpos __P((FILE *, const fpos_t *)); 230 long ftell __P((FILE *)); 231 size_t fwrite __P((const void *, size_t, size_t, FILE *)); 232 int getc __P((FILE *)); 233 int getchar __P((void)); 234 char *gets __P((char *)); 235 #if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE) 236 extern int sys_nerr; /* perror(3) external variables */ 237 extern const char *const sys_errlist[]; 238 #endif 239 void perror __P((const char *)); 240 int printf __P((const char *, ...)); 241 int putc __P((int, FILE *)); 242 int putchar __P((int)); 243 int puts __P((const char *)); 244 int remove __P((const char *)); 245 int rename __P((const char *, const char *)); 246 void rewind __P((FILE *)); 247 int scanf __P((const char *, ...)); 248 void setbuf __P((FILE *, char *)); 249 int setvbuf __P((FILE *, char *, int, size_t)); 250 int sprintf __P((char *, const char *, ...)); 251 int sscanf __P((const char *, const char *, ...)); 252 FILE *tmpfile __P((void)); 253 char *tmpnam __P((char *)); 254 int ungetc __P((int, FILE *)); 255 int vfprintf __P((FILE *, const char *, _BSD_VA_LIST_)); 256 int vprintf __P((const char *, _BSD_VA_LIST_)); 257 int vsprintf __P((char *, const char *, _BSD_VA_LIST_)); 258 __END_DECLS 259 260 /* 261 * Functions defined in POSIX 1003.1. 262 */ 263 #ifndef _ANSI_SOURCE 264 #define L_ctermid 1024 /* size for ctermid(); PATH_MAX */ 265 #define L_cuserid 9 /* size for cuserid(); UT_NAMESIZE + 1 */ 266 267 __BEGIN_DECLS 268 char *ctermid __P((char *)); 269 char *cuserid __P((char *)); 270 FILE *fdopen __P((int, const char *)); 271 int fileno __P((FILE *)); 272 __END_DECLS 273 #endif /* not ANSI */ 274 275 /* 276 * Routines that are purely local. 277 */ 278 #if !defined (_ANSI_SOURCE) && !defined(_POSIX_SOURCE) 279 __BEGIN_DECLS 280 char *fgetln __P((FILE *, size_t *)); 281 int fpurge __P((FILE *)); 282 int getw __P((FILE *)); 283 int pclose __P((FILE *)); 284 FILE *popen __P((const char *, const char *)); 285 int putw __P((int, FILE *)); 286 void setbuffer __P((FILE *, char *, int)); 287 int setlinebuf __P((FILE *)); 288 char *tempnam __P((const char *, const char *)); 289 int snprintf __P((char *, size_t, const char *, ...)) 290 __attribute__((format (printf, 3, 4))); 291 int vsnprintf __P((char *, size_t, const char *, _BSD_VA_LIST_)) 292 __attribute__((format (printf, 3, 0))); 293 int vscanf __P((const char *, _BSD_VA_LIST_)) 294 __attribute__((format (scanf, 1, 0))); 295 int vsscanf __P((const char *, const char *, _BSD_VA_LIST_)) 296 __attribute__((format (scanf, 2, 0))); 297 __END_DECLS 298 299 /* 300 * This is a #define because the function is used internally and 301 * (unlike vfscanf) the name __svfscanf is guaranteed not to collide 302 * with a user function when _ANSI_SOURCE or _POSIX_SOURCE is defined. 303 */ 304 #define vfscanf __svfscanf 305 306 /* 307 * Stdio function-access interface. 308 */ 309 __BEGIN_DECLS 310 FILE *funopen __P((const void *, 311 int (*)(void *, char *, int), 312 int (*)(void *, const char *, int), 313 fpos_t (*)(void *, fpos_t, int), 314 int (*)(void *))); 315 __END_DECLS 316 #define fropen(cookie, fn) funopen(cookie, fn, 0, 0, 0) 317 #define fwopen(cookie, fn) funopen(cookie, 0, fn, 0, 0) 318 #endif /* !_ANSI_SOURCE && !_POSIX_SOURCE */ 319 320 /* 321 * Functions internal to the implementation. 322 */ 323 __BEGIN_DECLS 324 int __srget __P((FILE *)); 325 int __svfscanf __P((FILE *, const char *, _BSD_VA_LIST_)); 326 int __swbuf __P((int, FILE *)); 327 __END_DECLS 328 329 /* 330 * The __sfoo macros are here so that we can 331 * define function versions in the C library. 332 */ 333 #define __sgetc(p) (--(p)->_r < 0 ? __srget(p) : (int)(*(p)->_p++)) 334 #if defined(__GNUC__) && defined(__STDC__) 335 static __inline int __sputc(int _c, FILE *_p) { 336 if (--_p->_w >= 0 || (_p->_w >= _p->_lbfsize && (char)_c != '\n')) 337 return (*_p->_p++ = _c); 338 else 339 return (__swbuf(_c, _p)); 340 } 341 #else 342 /* 343 * This has been tuned to generate reasonable code on the vax using pcc. 344 */ 345 #define __sputc(c, p) \ 346 (--(p)->_w < 0 ? \ 347 (p)->_w >= (p)->_lbfsize ? \ 348 (*(p)->_p = (c)), *(p)->_p != '\n' ? \ 349 (int)*(p)->_p++ : \ 350 __swbuf('\n', p) : \ 351 __swbuf((int)(c), p) : \ 352 (*(p)->_p = (c), (int)*(p)->_p++)) 353 #endif 354 355 #define __sfeof(p) (((p)->_flags & __SEOF) != 0) 356 #define __sferror(p) (((p)->_flags & __SERR) != 0) 357 #define __sclearerr(p) ((void)((p)->_flags &= ~(__SERR|__SEOF))) 358 #define __sfileno(p) ((p)->_file) 359 360 #define feof(p) __sfeof(p) 361 #define ferror(p) __sferror(p) 362 #define clearerr(p) __sclearerr(p) 363 364 #ifndef _ANSI_SOURCE 365 #define fileno(p) __sfileno(p) 366 #endif 367 368 #ifndef lint 369 #define getc(fp) __sgetc(fp) 370 #define putc(x, fp) __sputc(x, fp) 371 #endif /* lint */ 372 373 #define getchar() getc(stdin) 374 #define putchar(x) putc(x, stdout) 375 #endif /* _STDIO_H_ */ 376
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