[444] | 1 | /* |
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| 2 | * Copyright (c) 1990 The Regents of the University of California. |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms are permitted |
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| 6 | * provided that the above copyright notice and this paragraph are |
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| 7 | * duplicated in all such forms and that any documentation, |
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| 8 | * advertising materials, and other materials related to such |
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| 9 | * distribution and use acknowledge that the software was developed |
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| 10 | * by the University of California, Berkeley. The name of the |
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| 11 | * University may not be used to endorse or promote products derived |
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| 12 | * from this software without specific prior written permission. |
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| 13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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| 14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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| 15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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| 16 | */ |
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| 17 | |
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| 18 | /* |
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| 19 | FUNCTION |
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| 20 | <<fdopen>>---turn open file into a stream |
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| 21 | |
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| 22 | INDEX |
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| 23 | fdopen |
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| 24 | INDEX |
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| 25 | _fdopen_r |
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| 26 | |
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| 27 | SYNOPSIS |
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| 28 | #include <stdio.h> |
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| 29 | FILE *fdopen(int <[fd]>, const char *<[mode]>); |
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| 30 | FILE *_fdopen_r(struct _reent *<[reent]>, |
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| 31 | int <[fd]>, const char *<[mode]>); |
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| 32 | |
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| 33 | DESCRIPTION |
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| 34 | <<fdopen>> produces a file descriptor of type <<FILE *>>, from a |
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| 35 | descriptor for an already-open file (returned, for example, by the |
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| 36 | system subroutine <<open>> rather than by <<fopen>>). |
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| 37 | The <[mode]> argument has the same meanings as in <<fopen>>. |
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| 38 | |
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| 39 | RETURNS |
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| 40 | File pointer or <<NULL>>, as for <<fopen>>. |
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| 41 | |
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| 42 | PORTABILITY |
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| 43 | <<fdopen>> is ANSI. |
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| 44 | */ |
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| 45 | |
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| 46 | #include <_ansi.h> |
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| 47 | #include <reent.h> |
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| 48 | #include <sys/types.h> |
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| 49 | #include <sys/fcntl.h> |
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| 50 | #include <stdio.h> |
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| 51 | #include <errno.h> |
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| 52 | #include "local.h" |
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| 53 | #include <_syslist.h> |
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| 54 | |
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| 55 | FILE * |
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| 56 | _fdopen_r (struct _reent *ptr, |
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| 57 | int fd, |
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| 58 | const char *mode) |
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| 59 | { |
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| 60 | register FILE *fp; |
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| 61 | int flags, oflags; |
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| 62 | #ifdef HAVE_FCNTL |
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| 63 | int fdflags, fdmode; |
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| 64 | #endif |
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| 65 | |
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| 66 | if ((flags = __sflags (ptr, mode, &oflags)) == 0) |
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| 67 | return 0; |
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| 68 | |
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| 69 | /* make sure the mode the user wants is a subset of the actual mode */ |
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| 70 | #ifdef HAVE_FCNTL |
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| 71 | if ((fdflags = _fcntl_r (ptr, fd, F_GETFL, 0)) < 0) |
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| 72 | return 0; |
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| 73 | fdmode = fdflags & O_ACCMODE; |
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| 74 | if (fdmode != O_RDWR && (fdmode != (oflags & O_ACCMODE))) |
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| 75 | { |
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| 76 | ptr->_errno = EBADF; |
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| 77 | return 0; |
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| 78 | } |
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| 79 | #endif |
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| 80 | |
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| 81 | if ((fp = __sfp (ptr)) == 0) |
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| 82 | return 0; |
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| 83 | |
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| 84 | _newlib_flockfile_start (fp); |
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| 85 | |
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| 86 | fp->_flags = flags; |
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| 87 | /* POSIX recommends setting the O_APPEND bit on fd to match append |
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| 88 | streams. Someone may later clear O_APPEND on fileno(fp), but the |
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| 89 | stream must still remain in append mode. Rely on __sflags |
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| 90 | setting __SAPP properly. */ |
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| 91 | #ifdef HAVE_FCNTL |
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| 92 | if ((oflags & O_APPEND) && !(fdflags & O_APPEND)) |
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| 93 | _fcntl_r (ptr, fd, F_SETFL, fdflags | O_APPEND); |
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| 94 | #endif |
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| 95 | fp->_file = fd; |
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| 96 | fp->_cookie = (void *) fp; |
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| 97 | |
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| 98 | #undef _read |
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| 99 | #undef _write |
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| 100 | #undef _seek |
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| 101 | #undef _close |
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| 102 | |
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| 103 | fp->_read = __sread; |
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| 104 | fp->_write = __swrite; |
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| 105 | fp->_seek = __sseek; |
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| 106 | fp->_close = __sclose; |
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| 107 | |
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| 108 | #ifdef __SCLE |
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| 109 | /* Explicit given mode results in explicit setting mode on fd */ |
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| 110 | if (oflags & O_BINARY) |
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| 111 | setmode (fp->_file, O_BINARY); |
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| 112 | else if (oflags & O_TEXT) |
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| 113 | setmode (fp->_file, O_TEXT); |
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| 114 | if (__stextmode (fp->_file)) |
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| 115 | fp->_flags |= __SCLE; |
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| 116 | #endif |
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| 117 | |
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| 118 | _newlib_flockfile_end (fp); |
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| 119 | return fp; |
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| 120 | } |
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| 121 | |
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| 122 | #ifndef _REENT_ONLY |
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| 123 | |
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| 124 | FILE * |
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| 125 | fdopen (int fd, |
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| 126 | const char *mode) |
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| 127 | { |
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| 128 | return _fdopen_r (_REENT, fd, mode); |
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| 129 | } |
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| 130 | |
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| 131 | #endif |
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