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Annotation of src/include/stdio.h, Revision 1.2

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

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