uClibc_stdio.h 16 KB

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  1. /* Copyright (C) 2002-2004 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. #ifndef _STDIO_H
  8. #error Always include <stdio.h> rather than <bits/uClibc_stdio.h>
  9. #endif
  10. /**********************************************************************/
  11. #define __STDIO_BUFFERS
  12. /* ANSI/ISO mandate at least 256. */
  13. #if defined(__UCLIBC_HAS_STDIO_BUFSIZ_NONE__)
  14. /* Fake this because some apps use stdio.h BUFSIZ. */
  15. #define __STDIO_BUFSIZ 256
  16. #undef __STDIO_BUFFERS
  17. #elif defined(__UCLIBC_HAS_STDIO_BUFSIZ_256__)
  18. #define __STDIO_BUFSIZ 256
  19. #elif defined(__UCLIBC_HAS_STDIO_BUFSIZ_512__)
  20. #define __STDIO_BUFSIZ 512
  21. #elif defined(__UCLIBC_HAS_STDIO_BUFSIZ_1024__)
  22. #define __STDIO_BUFSIZ 1024
  23. #elif defined(__UCLIBC_HAS_STDIO_BUFSIZ_2048__)
  24. #define __STDIO_BUFSIZ 2048
  25. #elif defined(__UCLIBC_HAS_STDIO_BUFSIZ_4096__)
  26. #define __STDIO_BUFSIZ 4096
  27. #elif defined(__UCLIBC_HAS_STDIO_BUFSIZ_8192__)
  28. #define __STDIO_BUFSIZ 8192
  29. #else
  30. #error config seems to be out of sync regarding bufsiz options
  31. #endif
  32. #ifdef __UCLIBC_HAS_STDIO_BUFSIZ_NONE__
  33. #define __STDIO_BUILTIN_BUF_SIZE 0
  34. #else /* __UCLIBC_HAS_STDIO_BUFSIZ_NONE__ */
  35. #if defined(__UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE__)
  36. #define __STDIO_BUILTIN_BUF_SIZE 0
  37. #elif defined(__UCLIBC_HAS_STDIO_BUILTIN_BUFFER_4__)
  38. #define __STDIO_BUILTIN_BUF_SIZE 4
  39. #elif defined(__UCLIBC_HAS_STDIO_BUILTIN_BUFFER_8__)
  40. #define __STDIO_BUILTIN_BUF_SIZE 8
  41. #else
  42. #error config seems to be out of sync regarding builtin buffer size
  43. #endif
  44. #endif
  45. #if defined(__STDIO_BUFFERS) || defined(__UCLIBC_HAS_GLIBC_CUSTOM_STREAMS__) || defined(__UCLIBC_HAS_THREADS__)
  46. #define __STDIO_HAS_OPENLIST 1
  47. #else
  48. #undef __STDIO_HAS_OPENLIST
  49. #endif
  50. /**********************************************************************/
  51. /* Make sure defines related to large files are consistent. */
  52. #ifdef _LIBC
  53. #ifdef __UCLIBC_HAS_LFS__
  54. #undef __USE_LARGEFILE
  55. #undef __USE_LARGEFILE64
  56. #undef __USE_FILE_OFFSET64
  57. /* If we're actually building uClibc with large file support, only define... */
  58. #define __USE_LARGEFILE64 1
  59. #endif /* __UCLIBC_HAS_LFS__ */
  60. #else /* not _LIBC */
  61. #ifndef __UCLIBC_HAS_LFS__
  62. #if defined(__LARGEFILE64_SOURCE) || defined(__USE_LARGEFILE64) || defined(__USE_FILE_OFFSET64)
  63. #error Sorry... uClibc was built without large file support!
  64. #endif
  65. #endif /* __UCLIBC_HAS_LFS__ */
  66. #endif /* _LIBC */
  67. /**********************************************************************/
  68. #ifdef __UCLIBC_HAS_WCHAR__
  69. #define __need_wchar_t
  70. #include <stddef.h>
  71. /* Note: we don't really need mbstate for 8-bit locales. We do for UTF-8.
  72. * For now, always use it. */
  73. #define __STDIO_MBSTATE
  74. #define __need_mbstate_t
  75. #include <wchar.h>
  76. #endif
  77. /**********************************************************************/
  78. /* Currently unimplemented/untested */
  79. /* #define __STDIO_FLEXIBLE_SETVBUF */
  80. #ifdef __UCLIBC_HAS_STDIO_GETC_MACRO__
  81. #define __STDIO_GETC_MACRO
  82. #endif
  83. #ifdef __UCLIBC_HAS_STDIO_PUTC_MACRO__
  84. #define __STDIO_PUTC_MACRO
  85. #endif
  86. /* These are consistency checks on the different options */
  87. #ifndef __STDIO_BUFFERS
  88. #undef __STDIO_GETC_MACRO
  89. #undef __STDIO_PUTC_MACRO
  90. #endif
  91. #ifdef __BCC__
  92. #undef __UCLIBC_HAS_LFS__
  93. #endif
  94. #ifndef __UCLIBC_HAS_LFS__
  95. #undef __UCLIBC_HAS_FOPEN_LARGEFILE_MODE__
  96. #endif
  97. /**********************************************************************/
  98. #include <bits/uClibc_mutex.h>
  99. /* user_locking
  100. * 0 : do auto locking/unlocking
  101. * 1 : user does locking/unlocking
  102. * 2 : initial state prior to thread initialization
  103. * with no auto locking/unlocking
  104. *
  105. * When threading is initialized, walk the stdio open stream list
  106. * and do "if (user_locking == 2) user_locking = 0;".
  107. *
  108. * This way, we avoid calling the weak lock/unlock functions.
  109. */
  110. #define __STDIO_AUTO_THREADLOCK_VAR \
  111. __UCLIBC_MUTEX_AUTO_LOCK_VAR(__infunc_user_locking)
  112. #define __STDIO_AUTO_THREADLOCK(__stream) \
  113. __UCLIBC_MUTEX_AUTO_LOCK((__stream)->__lock, __infunc_user_locking, \
  114. (__stream)->__user_locking)
  115. #define __STDIO_AUTO_THREADUNLOCK(__stream) \
  116. __UCLIBC_MUTEX_AUTO_UNLOCK((__stream)->__lock, __infunc_user_locking)
  117. #define __STDIO_ALWAYS_THREADLOCK(__stream) \
  118. __UCLIBC_MUTEX_LOCK((__stream)->__lock)
  119. #define __STDIO_ALWAYS_THREADUNLOCK(__stream) \
  120. __UCLIBC_MUTEX_UNLOCK((__stream)->__lock)
  121. #define __STDIO_ALWAYS_THREADLOCK_CANCEL_UNSAFE(__stream) \
  122. __UCLIBC_MUTEX_LOCK_CANCEL_UNSAFE((__stream)->__lock)
  123. #define __STDIO_ALWAYS_THREADTRYLOCK_CANCEL_UNSAFE(__stream) \
  124. __UCLIBC_MUTEX_TRYLOCK_CANCEL_UNSAFE((__stream)->__lock)
  125. #define __STDIO_ALWAYS_THREADUNLOCK_CANCEL_UNSAFE(__stream) \
  126. __UCLIBC_MUTEX_UNLOCK_CANCEL_UNSAFE((__stream)->__lock)
  127. #ifdef __UCLIBC_HAS_THREADS__
  128. #define __STDIO_SET_USER_LOCKING(__stream) ((__stream)->__user_locking = 1)
  129. #else
  130. #define __STDIO_SET_USER_LOCKING(__stream) ((void)0)
  131. #endif
  132. /**********************************************************************/
  133. #define __STDIO_IOFBF 0 /* Fully buffered. */
  134. #define __STDIO_IOLBF 1 /* Line buffered. */
  135. #define __STDIO_IONBF 2 /* No buffering. */
  136. typedef struct {
  137. __off_t __pos;
  138. #ifdef __STDIO_MBSTATE
  139. __mbstate_t __mbstate;
  140. #endif
  141. #ifdef __UCLIBC_HAS_WCHAR__
  142. int __mblen_pending;
  143. #endif
  144. } __STDIO_fpos_t;
  145. #ifdef __UCLIBC_HAS_LFS__
  146. typedef struct {
  147. __off64_t __pos;
  148. #ifdef __STDIO_MBSTATE
  149. __mbstate_t __mbstate;
  150. #endif
  151. #ifdef __UCLIBC_HAS_WCHAR__
  152. int __mblen_pending;
  153. #endif
  154. } __STDIO_fpos64_t;
  155. #endif
  156. /**********************************************************************/
  157. #ifdef __UCLIBC_HAS_LFS__
  158. typedef __off64_t __offmax_t; /* TODO -- rename this? */
  159. #else
  160. typedef __off_t __offmax_t; /* TODO -- rename this? */
  161. #endif
  162. /**********************************************************************/
  163. #ifdef __UCLIBC_HAS_GLIBC_CUSTOM_STREAMS__
  164. typedef __ssize_t __io_read_fn(void *__cookie, char *__buf, size_t __bufsize);
  165. typedef __ssize_t __io_write_fn(void *__cookie,
  166. __const char *__buf, size_t __bufsize);
  167. /* NOTE: GLIBC difference!!! -- fopencookie seek function
  168. * For glibc, the type of pos is always (__off64_t *) but in our case
  169. * it is type (__off_t *) when the lib is built without large file support.
  170. */
  171. typedef int __io_seek_fn(void *__cookie, __offmax_t *__pos, int __whence);
  172. typedef int __io_close_fn(void *__cookie);
  173. typedef struct {
  174. __io_read_fn *read;
  175. __io_write_fn *write;
  176. __io_seek_fn *seek;
  177. __io_close_fn *close;
  178. } _IO_cookie_io_functions_t;
  179. #if defined(_LIBC) || defined(_GNU_SOURCE)
  180. typedef __io_read_fn cookie_read_function_t;
  181. typedef __io_write_fn cookie_write_function_t;
  182. typedef __io_seek_fn cookie_seek_function_t;
  183. typedef __io_close_fn cookie_close_function_t;
  184. typedef _IO_cookie_io_functions_t cookie_io_functions_t;
  185. #endif
  186. #endif
  187. /**********************************************************************/
  188. struct __STDIO_FILE_STRUCT {
  189. unsigned short __modeflags;
  190. /* There could be a hole here, but modeflags is used most.*/
  191. #ifdef __UCLIBC_HAS_WCHAR__
  192. unsigned char __ungot_width[2]; /* 0: current (building) char; 1: scanf */
  193. /* Move the following futher down to avoid problems with getc/putc
  194. * macros breaking shared apps when wchar config support is changed. */
  195. /* wchar_t ungot[2]; */
  196. #else /* __UCLIBC_HAS_WCHAR__ */
  197. unsigned char __ungot[2];
  198. #endif /* __UCLIBC_HAS_WCHAR__ */
  199. int __filedes;
  200. #ifdef __STDIO_BUFFERS
  201. unsigned char *__bufstart; /* pointer to buffer */
  202. unsigned char *__bufend; /* pointer to 1 past end of buffer */
  203. unsigned char *__bufpos;
  204. unsigned char *__bufread; /* pointer to 1 past last buffered read char */
  205. #ifdef __STDIO_GETC_MACRO
  206. unsigned char *__bufgetc_u; /* 1 past last readable by getc_unlocked */
  207. #endif /* __STDIO_GETC_MACRO */
  208. #ifdef __STDIO_PUTC_MACRO
  209. unsigned char *__bufputc_u; /* 1 past last writeable by putc_unlocked */
  210. #endif /* __STDIO_PUTC_MACRO */
  211. #endif /* __STDIO_BUFFERS */
  212. #ifdef __STDIO_HAS_OPENLIST
  213. struct __STDIO_FILE_STRUCT *__nextopen;
  214. #endif
  215. #ifdef __UCLIBC_HAS_GLIBC_CUSTOM_STREAMS__
  216. void *__cookie;
  217. _IO_cookie_io_functions_t __gcs;
  218. #endif
  219. #ifdef __UCLIBC_HAS_WCHAR__
  220. wchar_t __ungot[2];
  221. #endif
  222. #ifdef __STDIO_MBSTATE
  223. __mbstate_t __state;
  224. #endif
  225. #ifdef __UCLIBC_HAS_XLOCALE__
  226. void *__unused; /* Placeholder for codeset binding. */
  227. #endif
  228. #ifdef __UCLIBC_HAS_THREADS__
  229. int __user_locking;
  230. __UCLIBC_MUTEX(__lock);
  231. #endif
  232. /* Everything after this is unimplemented... and may be trashed. */
  233. #if __STDIO_BUILTIN_BUF_SIZE > 0
  234. unsigned char __builtinbuf[__STDIO_BUILTIN_BUF_SIZE];
  235. #endif /* __STDIO_BUILTIN_BUF_SIZE > 0 */
  236. };
  237. /***********************************************************************/
  238. /* Having ungotten characters implies the stream is reading.
  239. * The scheme used here treats the least significant 2 bits of
  240. * the stream's modeflags member as follows:
  241. * 0 0 Not currently reading.
  242. * 0 1 Reading, but no ungetc() or scanf() push back chars.
  243. * 1 0 Reading with one ungetc() char (ungot[1] is 1)
  244. * or one scanf() pushed back char (ungot[1] is 0).
  245. * 1 1 Reading with both an ungetc() char and a scanf()
  246. * pushed back char. Note that this must be the result
  247. * of a scanf() push back (in ungot[0]) _followed_ by
  248. * an ungetc() call (in ungot[1]).
  249. *
  250. * Notes:
  251. * scanf() can NOT use ungetc() to push back characters.
  252. * (See section 7.19.6.2 of the C9X rationale -- WG14/N897.)
  253. */
  254. #define __MASK_READING 0x0003U /* (0x0001 | 0x0002) */
  255. #define __FLAG_READING 0x0001U
  256. #define __FLAG_UNGOT 0x0002U
  257. #define __FLAG_EOF 0x0004U
  258. #define __FLAG_ERROR 0x0008U
  259. #define __FLAG_WRITEONLY 0x0010U
  260. #define __FLAG_READONLY 0x0020U /* (__FLAG_WRITEONLY << 1) */
  261. #define __FLAG_WRITING 0x0040U
  262. #define __FLAG_NARROW 0x0080U
  263. #define __FLAG_FBF 0x0000U /* must be 0 */
  264. #define __FLAG_LBF 0x0100U
  265. #define __FLAG_NBF 0x0200U /* (__FLAG_LBF << 1) */
  266. #define __MASK_BUFMODE 0x0300U /* (__FLAG_LBF|__FLAG_NBF) */
  267. #define __FLAG_APPEND 0x0400U /* fixed! == O_APPEND for linux */
  268. #define __FLAG_WIDE 0x0800U
  269. /* available slot 0x1000U */
  270. #define __FLAG_FREEFILE 0x2000U
  271. #define __FLAG_FREEBUF 0x4000U
  272. #define __FLAG_LARGEFILE 0x8000U /* fixed! == 0_LARGEFILE for linux */
  273. #define __FLAG_FAILED_FREOPEN __FLAG_LARGEFILE
  274. /* Note: In no-buffer mode, it would be possible to pack the necessary
  275. * flags into one byte. Since we wouldn't be buffering and there would
  276. * be no support for wchar, the only flags we would need would be:
  277. * 2 bits : ungot count
  278. * 2 bits : eof + error
  279. * 2 bits : readonly + writeonly
  280. * 1 bit : freefile
  281. * 1 bit : appending
  282. * So, for a very small system (< 128 files) we might have a
  283. * 4-byte FILE struct of:
  284. * unsigned char flags;
  285. * signed char filedes;
  286. * unsigned char ungot[2];
  287. */
  288. /**********************************************************************
  289. * PROTOTYPES OF INTERNAL FUNCTIONS
  290. **********************************************************************/
  291. #if defined _LIBC && (defined IS_IN_libc || defined NOT_IN_libc)
  292. extern void _stdio_init(void) attribute_hidden;
  293. extern void _stdio_term(void) attribute_hidden;
  294. #ifdef __STDIO_HAS_OPENLIST
  295. extern struct __STDIO_FILE_STRUCT *_stdio_openlist;
  296. #ifdef __UCLIBC_HAS_THREADS__
  297. __UCLIBC_MUTEX_EXTERN(_stdio_openlist_add_lock);
  298. #ifdef __STDIO_BUFFERS
  299. __UCLIBC_MUTEX_EXTERN(_stdio_openlist_del_lock);
  300. extern volatile int _stdio_openlist_use_count; /* _stdio_openlist_del_lock */
  301. extern int _stdio_openlist_del_count; /* _stdio_openlist_del_lock */
  302. #endif
  303. extern int _stdio_user_locking;
  304. extern void __stdio_init_mutex(__UCLIBC_MUTEX_TYPE *m) attribute_hidden;
  305. #endif
  306. #endif
  307. #endif
  308. /**********************************************************************/
  309. #define __CLEARERR_UNLOCKED(__stream) \
  310. ((void)((__stream)->__modeflags &= ~(__FLAG_EOF|__FLAG_ERROR)))
  311. #define __FEOF_UNLOCKED(__stream) ((__stream)->__modeflags & __FLAG_EOF)
  312. #define __FERROR_UNLOCKED(__stream) ((__stream)->__modeflags & __FLAG_ERROR)
  313. #ifdef __UCLIBC_HAS_THREADS__
  314. # define __CLEARERR(__stream) (clearerr)(__stream)
  315. # define __FERROR(__stream) (ferror)(__stream)
  316. # define __FEOF(__stream) (feof)(__stream)
  317. #else
  318. # define __CLEARERR(__stream) __CLEARERR_UNLOCKED(__stream)
  319. # define __FERROR(__stream) __FERROR_UNLOCKED(__stream)
  320. # define __FEOF(__stream) __FEOF_UNLOCKED(__stream)
  321. #endif
  322. extern int __fgetc_unlocked(FILE *__stream);
  323. libc_hidden_proto(__fgetc_unlocked)
  324. extern int __fputc_unlocked(int __c, FILE *__stream);
  325. libc_hidden_proto(__fputc_unlocked)
  326. /* First define the default definitions.
  327. They are overridden below as necessary. */
  328. #define __FGETC_UNLOCKED(__stream) (__fgetc_unlocked)((__stream))
  329. #define __FGETC(__stream) (fgetc)((__stream))
  330. #define __GETC_UNLOCKED_MACRO(__stream) (__fgetc_unlocked)((__stream))
  331. #define __GETC_UNLOCKED(__stream) (__fgetc_unlocked)((__stream))
  332. #define __GETC(__stream) (fgetc)((__stream))
  333. #define __FPUTC_UNLOCKED(__c, __stream) (__fputc_unlocked)((__c),(__stream))
  334. #define __FPUTC(__c, __stream) (fputc)((__c),(__stream))
  335. #define __PUTC_UNLOCKED_MACRO(__c, __stream) (__fputc_unlocked)((__c),(__stream))
  336. #define __PUTC_UNLOCKED(__c, __stream) (__fputc_unlocked)((__c),(__stream))
  337. #define __PUTC(__c, __stream) (fputc)((__c),(__stream))
  338. #ifdef __STDIO_GETC_MACRO
  339. extern FILE *__stdin; /* For getchar() macro. */
  340. # undef __GETC_UNLOCKED_MACRO
  341. # define __GETC_UNLOCKED_MACRO(__stream) \
  342. ( ((__stream)->__bufpos < (__stream)->__bufgetc_u) \
  343. ? (*(__stream)->__bufpos++) \
  344. : __fgetc_unlocked(__stream) )
  345. # if 0
  346. /* Classic macro approach. getc{_unlocked} can have side effects. */
  347. # undef __GETC_UNLOCKED
  348. # define __GETC_UNLOCKED(__stream) __GETC_UNLOCKED_MACRO((__stream))
  349. # ifndef __UCLIBC_HAS_THREADS__
  350. # undef __GETC
  351. # define __GETC(__stream) __GETC_UNLOCKED_MACRO((__stream))
  352. # endif
  353. # else
  354. /* Using gcc extension for safety and additional inlining. */
  355. # undef __FGETC_UNLOCKED
  356. # define __FGETC_UNLOCKED(__stream) \
  357. (__extension__ ({ \
  358. FILE *__S = (__stream); \
  359. __GETC_UNLOCKED_MACRO(__S); \
  360. }) )
  361. # undef __GETC_UNLOCKED
  362. # define __GETC_UNLOCKED(__stream) __FGETC_UNLOCKED((__stream))
  363. # ifdef __UCLIBC_HAS_THREADS__
  364. # undef __FGETC
  365. # define __FGETC(__stream) \
  366. (__extension__ ({ \
  367. FILE *__S = (__stream); \
  368. ((__S->__user_locking ) \
  369. ? __GETC_UNLOCKED_MACRO(__S) \
  370. : (fgetc)(__S)); \
  371. }) )
  372. # undef __GETC
  373. # define __GETC(__stream) __FGETC((__stream))
  374. # else
  375. # undef __FGETC
  376. # define __FGETC(__stream) __FGETC_UNLOCKED((__stream))
  377. # undef __GETC
  378. # define __GETC(__stream) __FGETC_UNLOCKED((__stream))
  379. # endif
  380. # endif
  381. #else
  382. #endif /* __STDIO_GETC_MACRO */
  383. #ifdef __STDIO_PUTC_MACRO
  384. extern FILE *__stdout; /* For putchar() macro. */
  385. # undef __PUTC_UNLOCKED_MACRO
  386. # define __PUTC_UNLOCKED_MACRO(__c, __stream) \
  387. ( ((__stream)->__bufpos < (__stream)->__bufputc_u) \
  388. ? (*(__stream)->__bufpos++) = (__c) \
  389. : __fputc_unlocked((__c),(__stream)) )
  390. # if 0
  391. /* Classic macro approach. putc{_unlocked} can have side effects.*/
  392. # undef __PUTC_UNLOCKED
  393. # define __PUTC_UNLOCKED(__c, __stream) \
  394. __PUTC_UNLOCKED_MACRO((__c), (__stream))
  395. # ifndef __UCLIBC_HAS_THREADS__
  396. # undef __PUTC
  397. # define __PUTC(__c, __stream) __PUTC_UNLOCKED_MACRO((__c), (__stream))
  398. # endif
  399. # else
  400. /* Using gcc extension for safety and additional inlining. */
  401. # undef __FPUTC_UNLOCKED
  402. # define __FPUTC_UNLOCKED(__c, __stream) \
  403. (__extension__ ({ \
  404. FILE *__S = (__stream); \
  405. __PUTC_UNLOCKED_MACRO((__c),__S); \
  406. }) )
  407. # undef __PUTC_UNLOCKED
  408. # define __PUTC_UNLOCKED(__c, __stream) __FPUTC_UNLOCKED((__c), (__stream))
  409. # ifdef __UCLIBC_HAS_THREADS__
  410. # undef __FPUTC
  411. # define __FPUTC(__c, __stream) \
  412. (__extension__ ({ \
  413. FILE *__S = (__stream); \
  414. ((__S->__user_locking) \
  415. ? __PUTC_UNLOCKED_MACRO((__c),__S) \
  416. : (fputc)((__c),__S)); \
  417. }) )
  418. # undef __PUTC
  419. # define __PUTC(__c, __stream) __FPUTC((__c), (__stream))
  420. # else
  421. # undef __FPUTC
  422. # define __FPUTC(__c, __stream) __FPUTC_UNLOCKED((__c),(__stream))
  423. # undef __PUTC
  424. # define __PUTC(__c, __stream) __FPUTC_UNLOCKED((__c),(__stream))
  425. # endif
  426. # endif
  427. #endif /* __STDIO_PUTC_MACRO */