/* Copyright (C) 2004 Manuel Novoa III <mjn3@codepoet.org> * * GNU Library General Public License (LGPL) version 2 or later. * * Dedicated to Toni. See uClibc/DEDICATION.mjn3 for details. */ #include "_stdio.h" /* * Cases: * fopen64 : filename != NULL, stream == NULL, filedes == -2 * fopen : filename != NULL, stream == NULL, filedes == -1 * freopen : filename != NULL, stream != NULL, filedes == -1 * fdopen : filename == NULL, stream == NULL, filedes valid * * fsfopen : filename != NULL, stream != NULL, filedes == -1 */ #if (O_ACCMODE != 3) || (O_RDONLY != 0) || (O_WRONLY != 1) || (O_RDWR != 2) #error Assumption violated - mode constants #endif #ifndef O_LARGEFILE #define O_LARGEFILE 0 #endif /* Internal function -- reentrant (locks open file list) */ FILE attribute_hidden *_stdio_fopen(intptr_t fname_or_mode, register const char * __restrict mode, register FILE * __restrict stream, int filedes) { __mode_t open_mode; int i; /* Parse the specified mode. */ open_mode = O_RDONLY; if (*mode != 'r') { /* Not read... */ open_mode = (O_WRONLY | O_CREAT | O_TRUNC); if (*mode != 'w') { /* Not write (create or truncate)... */ open_mode = (O_WRONLY | O_CREAT | O_APPEND); if (*mode != 'a') { /* Not write (create or append)... */ DO_EINVAL: __set_errno(EINVAL); /* So illegal mode. */ if (stream) { FREE_STREAM: assert(!(stream->__modeflags & __FLAG_FREEBUF)); __STDIO_STREAM_FREE_FILE(stream); } return NULL; } } } if ((mode[1] == 'b')) { /* Binary mode (NO-OP currently). */ ++mode; } if (mode[1] == '+') { /* Read and Write. */ ++mode; open_mode |= (O_RDONLY | O_WRONLY); open_mode += (O_RDWR - (O_RDONLY | O_WRONLY)); } #if defined(__UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE__) || defined(__UCLIBC_HAS_FOPEN_LARGEFILE_MODE__) || \ defined(__UCLIBC_HAS_FOPEN_CLOSEEXEC_MODE__) while (*++mode) { # ifdef __UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE__ if (*mode == 'x') { /* Open exclusive (a glibc extension). */ open_mode |= O_EXCL; continue; } # endif # ifdef __UCLIBC_HAS_FOPEN_LARGEFILE_MODE__ if (*mode == 'F') { /* Open as large file (uClibc extension). */ open_mode |= O_LARGEFILE; continue; } # endif # ifdef __UCLIBC_HAS_FOPEN_CLOSEEXEC_MODE__ if (*mode == 'e') { /* Close on exec (a glibc extension). */ open_mode |= O_CLOEXEC; continue; } # endif } #endif if (!stream) { /* Need to allocate a FILE (not freopen). */ if ((stream = malloc(sizeof(FILE))) == NULL) { return stream; } stream->__modeflags = __FLAG_FREEFILE; #ifdef __STDIO_BUFFERS stream->__bufstart = NULL; /* We allocate a buffer below. */ #endif #ifdef __UCLIBC_HAS_THREADS__ /* We only initialize the mutex in the non-freopen case. */ /* stream->__user_locking = _stdio_user_locking; */ STDIO_INIT_MUTEX(stream->__lock); #endif } if (filedes >= 0) { /* Handle fdopen trickery. */ stream->__filedes = filedes; /* NOTE: it is insufficient to just check R/W/RW agreement. * We must also check largefile compatibility if applicable. * Also, if append mode is desired for fdopen but O_APPEND isn't * currently set, then set it as recommended by SUSv3. However, * if append mode is not specified for fdopen but O_APPEND is set, * leave it set (glibc compat). */ i = (open_mode & (O_ACCMODE|O_LARGEFILE)) + 1; /* NOTE: fopencookie needs changing if the basic check changes! */ if ((i & ((int)fname_or_mode + 1)) != i) /* Basic agreement? */ goto DO_EINVAL; if ((open_mode & ~(__mode_t)fname_or_mode) & O_APPEND) { if (fcntl(filedes, F_SETFL, O_APPEND)) /* Need O_APPEND. */ goto DO_EINVAL; } /* For later... to reflect largefile setting in stream flags. */ __STDIO_WHEN_LFS( open_mode |= (((__mode_t) fname_or_mode) & O_LARGEFILE) ); } else { __STDIO_WHEN_LFS( if (filedes < -1) open_mode |= O_LARGEFILE ); if ((stream->__filedes = open(((const char *) fname_or_mode), open_mode, 0666)) < 0) { goto FREE_STREAM; } } stream->__modeflags &= __FLAG_FREEFILE; /* stream->__modeflags &= ~(__FLAG_READONLY|__FLAG_WRITEONLY); */ stream->__modeflags |= /* Note: Makes assumptions about flag vals! */ #if (O_APPEND != __FLAG_APPEND) || ((O_LARGEFILE != __FLAG_LARGEFILE) && (O_LARGEFILE != 0)) # if (O_APPEND != __FLAG_APPEND) ((open_mode & O_APPEND) ? __FLAG_APPEND : 0) | # else (open_mode & O_APPEND) | # endif # if (O_LARGEFILE != __FLAG_LARGEFILE) && (O_LARGEFILE != 0) ((open_mode & O_LARGEFILE) ? __FLAG_LARGEFILE : 0) | # else (open_mode & O_LARGEFILE) | # endif #else (open_mode & (O_APPEND|O_LARGEFILE)) | /* i386 linux and elks */ #endif ((((open_mode & O_ACCMODE) + 1) ^ 0x03) * __FLAG_WRITEONLY); #ifdef __STDIO_BUFFERS if (stream->__filedes != INT_MAX) { /* NB: fopencookie uses bogus filedes == INT_MAX, * avoiding isatty() in that case. */ i = errno; /* preserve errno against isatty call. */ if (isatty(stream->__filedes)) stream->__modeflags |= __FLAG_LBF; __set_errno(i); } if (!stream->__bufstart) { if ((stream->__bufstart = malloc(BUFSIZ)) != NULL) { stream->__bufend = stream->__bufstart + BUFSIZ; stream->__modeflags |= __FLAG_FREEBUF; } else { # if __STDIO_BUILTIN_BUF_SIZE > 0 stream->__bufstart = stream->__builtinbuf; stream->__bufend = stream->__builtinbuf + sizeof(stream->__builtinbuf); # else /* __STDIO_BUILTIN_BUF_SIZE > 0 */ stream->__bufend = stream->__bufstart; # endif /* __STDIO_BUILTIN_BUF_SIZE > 0 */ } } __STDIO_STREAM_DISABLE_GETC(stream); __STDIO_STREAM_DISABLE_PUTC(stream); __STDIO_STREAM_INIT_BUFREAD_BUFPOS(stream); #endif #ifdef __UCLIBC_HAS_WCHAR__ stream->__ungot_width[0] = 0; #endif #ifdef __STDIO_MBSTATE __INIT_MBSTATE(&(stream->__state)); #endif #ifdef __UCLIBC_HAS_THREADS__ /* Even in the freopen case, we reset the user locking flag. */ stream->__user_locking = _stdio_user_locking; /* STDIO_INIT_MUTEX(stream->__lock); */ #endif #ifdef __STDIO_HAS_OPENLIST #if defined(__UCLIBC_HAS_THREADS__) && defined(__STDIO_BUFFERS) if (!(stream->__modeflags & __FLAG_FREEFILE)) { /* An freopen call so the file was never removed from the list. */ } else #endif { /* We have to lock the del mutex in case another thread wants to fclose() * the last file. */ __STDIO_THREADLOCK_OPENLIST_DEL; __STDIO_THREADLOCK_OPENLIST_ADD; stream->__nextopen = _stdio_openlist; /* New files are inserted at */ _stdio_openlist = stream; /* the head of the list. */ __STDIO_THREADUNLOCK_OPENLIST_ADD; __STDIO_THREADUNLOCK_OPENLIST_DEL; } #endif __STDIO_STREAM_VALIDATE(stream); return stream; }