1 /* Copyright (C) 2004 Manuel Novoa III <mjn3@codepoet.org>
2 *
3 * GNU Library General Public License (LGPL) version 2 or later.
4 *
5 * Dedicated to Toni. See uClibc/DEDICATION.mjn3 for details.
6 */
7
8 #include "_stdio.h"
9
10
11 /*
12 * Cases:
13 * fopen64 : filename != NULL, stream == NULL, filedes == -2
14 * fopen : filename != NULL, stream == NULL, filedes == -1
15 * freopen : filename != NULL, stream != NULL, filedes == -1
16 * fdopen : filename == NULL, stream == NULL, filedes valid
17 *
18 * fsfopen : filename != NULL, stream != NULL, filedes == -1
19 */
20
21 #if (O_ACCMODE != 3) || (O_RDONLY != 0) || (O_WRONLY != 1) || (O_RDWR != 2)
22 #error Assumption violated - mode constants
23 #endif
24
25 #ifndef O_LARGEFILE
26 #define O_LARGEFILE 0
27 #endif
28
29 /* Internal function -- reentrant (locks open file list) */
30
_stdio_fopen(intptr_t fname_or_mode,register const char * __restrict mode,register FILE * __restrict stream,int filedes)31 FILE attribute_hidden *_stdio_fopen(intptr_t fname_or_mode,
32 register const char * __restrict mode,
33 register FILE * __restrict stream, int filedes)
34 {
35 __mode_t open_mode;
36 int i;
37
38 /* Parse the specified mode. */
39 open_mode = O_RDONLY;
40 if (*mode != 'r') { /* Not read... */
41 open_mode = (O_WRONLY | O_CREAT | O_TRUNC);
42 if (*mode != 'w') { /* Not write (create or truncate)... */
43 open_mode = (O_WRONLY | O_CREAT | O_APPEND);
44 if (*mode != 'a') { /* Not write (create or append)... */
45 DO_EINVAL:
46 __set_errno(EINVAL); /* So illegal mode. */
47 if (stream) {
48 FREE_STREAM:
49 assert(!(stream->__modeflags & __FLAG_FREEBUF));
50 __STDIO_STREAM_FREE_FILE(stream);
51 }
52 return NULL;
53 }
54 }
55 }
56
57 if ((mode[1] == 'b')) { /* Binary mode (NO-OP currently). */
58 ++mode;
59 }
60
61 if (mode[1] == '+') { /* Read and Write. */
62 ++mode;
63 open_mode |= (O_RDONLY | O_WRONLY);
64 open_mode += (O_RDWR - (O_RDONLY | O_WRONLY));
65 }
66
67 #if defined(__UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE__) || defined(__UCLIBC_HAS_FOPEN_LARGEFILE_MODE__) || \
68 defined(__UCLIBC_HAS_FOPEN_CLOSEEXEC_MODE__)
69
70 while (*++mode) {
71 # ifdef __UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE__
72 if (*mode == 'x') { /* Open exclusive (a glibc extension). */
73 open_mode |= O_EXCL;
74 continue;
75 }
76 # endif
77 # ifdef __UCLIBC_HAS_FOPEN_LARGEFILE_MODE__
78 if (*mode == 'F') { /* Open as large file (uClibc extension). */
79 open_mode |= O_LARGEFILE;
80 continue;
81 }
82 # endif
83 # ifdef __UCLIBC_HAS_FOPEN_CLOSEEXEC_MODE__
84 if (*mode == 'e') { /* Close on exec (a glibc extension). */
85 open_mode |= O_CLOEXEC;
86 continue;
87 }
88 # endif
89 }
90
91 #endif
92
93 if (!stream) { /* Need to allocate a FILE (not freopen). */
94 if ((stream = malloc(sizeof(FILE))) == NULL) {
95 return stream;
96 }
97 stream->__modeflags = __FLAG_FREEFILE;
98 #ifdef __STDIO_BUFFERS
99 stream->__bufstart = NULL; /* We allocate a buffer below. */
100 #endif
101 #ifdef __UCLIBC_HAS_THREADS__
102 /* We only initialize the mutex in the non-freopen case. */
103 /* stream->__user_locking = _stdio_user_locking; */
104 STDIO_INIT_MUTEX(stream->__lock);
105 #endif
106 }
107
108 if (filedes >= 0) { /* Handle fdopen trickery. */
109 stream->__filedes = filedes;
110 /* NOTE: it is insufficient to just check R/W/RW agreement.
111 * We must also check largefile compatibility if applicable.
112 * Also, if append mode is desired for fdopen but O_APPEND isn't
113 * currently set, then set it as recommended by SUSv3. However,
114 * if append mode is not specified for fdopen but O_APPEND is set,
115 * leave it set (glibc compat). */
116 i = (open_mode & (O_ACCMODE|O_LARGEFILE)) + 1;
117
118 /* NOTE: fopencookie needs changing if the basic check changes! */
119 if ((i & ((int)fname_or_mode + 1)) != i) /* Basic agreement? */
120 goto DO_EINVAL;
121 if ((open_mode & ~(__mode_t)fname_or_mode) & O_APPEND) {
122 if (fcntl(filedes, F_SETFL, O_APPEND)) /* Need O_APPEND. */
123 goto DO_EINVAL;
124 }
125 /* For later... to reflect largefile setting in stream flags. */
126 __STDIO_WHEN_LFS( open_mode |= (((__mode_t) fname_or_mode)
127 & O_LARGEFILE) );
128 } else {
129 __STDIO_WHEN_LFS( if (filedes < -1) open_mode |= O_LARGEFILE );
130 if ((stream->__filedes = open(((const char *) fname_or_mode),
131 open_mode, 0666)) < 0) {
132 goto FREE_STREAM;
133 }
134 }
135
136 stream->__modeflags &= __FLAG_FREEFILE;
137 /* stream->__modeflags &= ~(__FLAG_READONLY|__FLAG_WRITEONLY); */
138
139 stream->__modeflags |= /* Note: Makes assumptions about flag vals! */
140 #if (O_APPEND != __FLAG_APPEND) || ((O_LARGEFILE != __FLAG_LARGEFILE) && (O_LARGEFILE != 0))
141 # if (O_APPEND != __FLAG_APPEND)
142 ((open_mode & O_APPEND) ? __FLAG_APPEND : 0) |
143 # else
144 (open_mode & O_APPEND) |
145 # endif
146 # if (O_LARGEFILE != __FLAG_LARGEFILE) && (O_LARGEFILE != 0)
147 ((open_mode & O_LARGEFILE) ? __FLAG_LARGEFILE : 0) |
148 # else
149 (open_mode & O_LARGEFILE) |
150 # endif
151 #else
152 (open_mode & (O_APPEND|O_LARGEFILE)) | /* i386 linux and elks */
153 #endif
154 ((((open_mode & O_ACCMODE) + 1) ^ 0x03) * __FLAG_WRITEONLY);
155
156 #ifdef __STDIO_BUFFERS
157 if (stream->__filedes != INT_MAX) {
158 /* NB: fopencookie uses bogus filedes == INT_MAX,
159 * avoiding isatty() in that case.
160 */
161 i = errno; /* preserve errno against isatty call. */
162 if (isatty(stream->__filedes))
163 stream->__modeflags |= __FLAG_LBF;
164 __set_errno(i);
165 }
166
167 if (!stream->__bufstart) {
168 if ((stream->__bufstart = malloc(BUFSIZ)) != NULL) {
169 stream->__bufend = stream->__bufstart + BUFSIZ;
170 stream->__modeflags |= __FLAG_FREEBUF;
171 } else {
172 # if __STDIO_BUILTIN_BUF_SIZE > 0
173 stream->__bufstart = stream->__builtinbuf;
174 stream->__bufend = stream->__builtinbuf + sizeof(stream->__builtinbuf);
175 # else /* __STDIO_BUILTIN_BUF_SIZE > 0 */
176 stream->__bufend = stream->__bufstart;
177 # endif /* __STDIO_BUILTIN_BUF_SIZE > 0 */
178 }
179 }
180
181 __STDIO_STREAM_DISABLE_GETC(stream);
182 __STDIO_STREAM_DISABLE_PUTC(stream);
183 __STDIO_STREAM_INIT_BUFREAD_BUFPOS(stream);
184 #endif
185
186 #ifdef __UCLIBC_HAS_WCHAR__
187 stream->__ungot_width[0] = 0;
188 #endif
189 #ifdef __STDIO_MBSTATE
190 __INIT_MBSTATE(&(stream->__state));
191 #endif
192
193 #ifdef __UCLIBC_HAS_THREADS__
194 /* Even in the freopen case, we reset the user locking flag. */
195 stream->__user_locking = _stdio_user_locking;
196 /* STDIO_INIT_MUTEX(stream->__lock); */
197 #endif
198
199 #ifdef __STDIO_HAS_OPENLIST
200 #if defined(__UCLIBC_HAS_THREADS__) && defined(__STDIO_BUFFERS)
201 if (!(stream->__modeflags & __FLAG_FREEFILE))
202 {
203 /* An freopen call so the file was never removed from the list. */
204 }
205 else
206 #endif
207 {
208 /* We have to lock the del mutex in case another thread wants to fclose()
209 * the last file. */
210 __STDIO_THREADLOCK_OPENLIST_DEL;
211 __STDIO_THREADLOCK_OPENLIST_ADD;
212 stream->__nextopen = _stdio_openlist; /* New files are inserted at */
213 _stdio_openlist = stream; /* the head of the list. */
214 __STDIO_THREADUNLOCK_OPENLIST_ADD;
215 __STDIO_THREADUNLOCK_OPENLIST_DEL;
216 }
217 #endif
218
219 __STDIO_STREAM_VALIDATE(stream);
220
221 return stream;
222 }
223