diff options
Diffstat (limited to 'libc/stdio')
| -rw-r--r-- | libc/stdio/Makefile | 4 | ||||
| -rw-r--r-- | libc/stdio/stdio.c | 139 |
2 files changed, 83 insertions, 60 deletions
diff --git a/libc/stdio/Makefile b/libc/stdio/Makefile index 7c6b9116a..3c0103e52 100644 --- a/libc/stdio/Makefile +++ b/libc/stdio/Makefile @@ -35,7 +35,9 @@ ifeq ($(HAS_LONG_LONG),true) endif MSRC=stdio.c -MOBJ=_stdio_init.o _stdio_buffer.o clearerr.o feof.o ferror.o fileno.o \ +MOBJ=_stdio_init.o \ + _alloc_stdio_buffer.o _free_stdio_buffer.o _free_stdio_stream.o \ + clearerr.o feof.o ferror.o fileno.o \ setbuffer.o setvbuf.o setbuf.o setlinebuf.o \ fclose.o _fopen.o fopen.o freopen.o fdopen.o fflush.o \ fseek.o rewind.o ftell.o fgetpos.o fsetpos.o \ diff --git a/libc/stdio/stdio.c b/libc/stdio/stdio.c index b3d514c35..7ed545742 100644 --- a/libc/stdio/stdio.c +++ b/libc/stdio/stdio.c @@ -49,7 +49,7 @@ extern void _free_stdio_buffer(unsigned char *buf); extern void _free_stdio_stream(FILE *fp); #endif -#ifdef L__stdio_buffer +#ifdef L__alloc_stdio_buffer unsigned char *_alloc_stdio_buffer(size_t size) { if (size == BUFSIZ) { @@ -63,7 +63,9 @@ unsigned char *_alloc_stdio_buffer(size_t size) } return malloc(size); } +#endif +#ifdef L__free_stdio_buffer void _free_stdio_buffer(unsigned char *buf) { int i; @@ -117,8 +119,10 @@ FILE *_stderr = _stdio_streams + 2; */ FILE *__IO_list = _stdio_streams; /* For fflush at exit */ -/* Call the stdio initiliser; it's main job it to call atexit */ - +/* + * __stdio_close_all is automatically when exiting if stdio is used. + * See misc/internals/__uClibc_main.c and and stdlib/atexit.c. + */ void __stdio_close_all(void) { FILE *fp; @@ -129,6 +133,9 @@ void __stdio_close_all(void) } } +/* + * __init_stdio is automatically by __uClibc_main if stdio is used. + */ void __init_stdio(void) { #if (FIXED_BUFFERS > 2) || (FIXED_STREAMS > 3) @@ -148,12 +155,13 @@ void __init_stdio(void) _fixed_buffers[0].used = 1; _fixed_buffers[1].used = 1; - if (isatty(1)) { - stdout->mode |= _IOLBF; - } +#if _IOFBF != 0 || _IOLBF != 1 +#error Assumption violated -- values of _IOFBF and/or _IOLBF +/* This asssumption is also made in _fopen. */ +#endif - /* Cleanup is now taken care of in __uClibc_main. */ - /* atexit(__stdio_close_all); */ + /* stdout uses line buffering when connected to a tty. */ + _stdio_streams[1].mode |= isatty(1); } #endif @@ -206,9 +214,18 @@ FILE *fp; if (fp->mode & __MODE_WRITING) fflush(fp); +#if 1 +#warning Need to check out tie between stdin and stdout. + /* + * This bit of code needs checking. The way I read the C89 standard, + * there is no guarantee that stdout is flushed before reading stdin. + * Plus, this is broken if either stdin or stdout has been closed and + * reopend. + */ if ( (fp == stdin) && (stdout->fd != -1) && (stdout->mode & __MODE_WRITING) ) fflush(stdout); +#endif /* Can't read or there's been an EOF or error then return EOF */ if ((fp->mode & (__MODE_READ | __MODE_EOF | __MODE_ERR)) != @@ -572,32 +589,32 @@ const char *mode; int fopen_mode; int i; - fopen_mode = 0; + nfp = fp; - /* If we've got an fp close the old one (freopen) */ - if (fp) { /* We don't want to deallocate fp. */ - fopen_mode |= - (fp->mode & (__MODE_BUF | __MODE_FREEFIL | __MODE_FREEBUF)); - fp->mode &= ~(__MODE_FREEFIL | __MODE_FREEBUF); - fclose(fp); + /* If we've got an fp, flush it and close the old fd (freopen) */ + if (nfp) { /* We don't want to deallocate fp. */ + fflush(nfp); + close(nfp->fd); + nfp->mode &= (__MODE_FREEFIL | __MODE_FREEBUF); } - /* decode the new open mode */ + /* Parse the mode string arg. */ switch (*mode++) { case 'r': /* read */ - fopen_mode |= __MODE_READ; + fopen_mode = __MODE_READ; open_mode = O_RDONLY; break; case 'w': /* write (create or truncate)*/ - fopen_mode |= __MODE_WRITE; + fopen_mode = __MODE_WRITE; open_mode = (O_WRONLY | O_CREAT | O_TRUNC); break; case 'a': /* write (create or append) */ - fopen_mode |= __MODE_WRITE; + fopen_mode = __MODE_WRITE; open_mode = (O_WRONLY | O_CREAT | O_APPEND); break; default: /* illegal mode */ - return 0; + errno = EINVAL; + goto _fopen_ERROR; } if ((*mode == 'b')) { /* binary mode (nop for uClibc) */ @@ -618,7 +635,6 @@ const char *mode; ++mode; } - nfp = 0; if (fp == 0) { /* We need a FILE so allocate it before */ for (i = 0; i < FIXED_STREAMS; i++) { /* we potentially call open. */ if (_stdio_streams[i].fd == -1) { @@ -629,46 +645,46 @@ const char *mode; if ((i == FIXED_STREAMS) && (!(nfp = malloc(sizeof(FILE))))) { return 0; } + nfp->mode = __MODE_FREEFIL; + /* Initially set to use 8 byte buffer in FILE structure */ + nfp->bufstart = nfp->unbuf; + nfp->bufend = nfp->unbuf + sizeof(nfp->unbuf); } - if (fname) { /* Open the file itself */ fd = open(fname, open_mode, 0666); } - if (fd < 0) { /* Error from open or bad arg. */ +#warning fdopen should check that modes are compatible with existing fd. + + if (fd < 0) { /* Error from open or bad arg passed. */ + _fopen_ERROR: if (nfp) { + if (nfp->mode & __MODE_FREEBUF) { + _free_stdio_buffer(nfp->bufstart); + } _free_stdio_stream(nfp); } return 0; } + nfp->fd = fd; /* Set FILE's fd before adding to open list. */ + if (fp == 0) { /* Not freopen so... */ - fp = nfp; /* use newly created FILE and */ - fp->next = __IO_list; /* add it to the list of open files. */ - __IO_list = fp; - - fp->mode = __MODE_FREEFIL; - if (!(fp->bufstart = _alloc_stdio_buffer(BUFSIZ))) { - /* Allocation failed so use 8 byte buffer in FILE structure */ - fp->bufstart = fp->unbuf; - fp->bufend = fp->unbuf + sizeof(fp->unbuf); - } else { - fp->bufend = fp->bufstart + BUFSIZ; - fp->mode |= __MODE_FREEBUF; - } - } + nfp->next = __IO_list; /* use newly created FILE and */ + __IO_list = nfp; /* add it to the list of open files. */ - if (isatty(fd)) { - fp->mode |= _IOLBF; - } else { /* Note: the following should be optimized */ - fp->mode |= _IOFBF; /* away since we should have _IOFBF = 0. */ + if ((nfp->bufstart = _alloc_stdio_buffer(BUFSIZ)) != 0) { + nfp->bufend = nfp->bufstart + BUFSIZ; + nfp->mode |= __MODE_FREEBUF; + } } /* Ok, file's ready clear the buffer and save important bits */ - fp->bufpos = fp->bufread = fp->bufwrite = fp->bufstart; - fp->mode |= fopen_mode; - fp->fd = fd; - return fp; + nfp->bufpos = nfp->bufread = nfp->bufwrite = nfp->bufstart; + nfp->mode |= fopen_mode; + nfp->mode |= isatty(fd); + + return nfp; } #endif @@ -688,33 +704,38 @@ FILE *fp; rv = EOF; } - if (fp->mode & __MODE_FREEBUF) { + if (fp->mode & __MODE_FREEBUF) { /* Free buffer if necessary. */ _free_stdio_buffer(fp->bufstart); } - if (fp->mode & __MODE_FREEFIL) { - prev = 0; - for (ptr = __IO_list; ptr ; ptr = ptr->next) { - if (ptr == fp) { - if (prev == 0) { - __IO_list = fp->next; - } else { - prev->next = fp->next; - } - _free_stdio_stream(fp); - break; + prev = 0; /* Remove file from open list. */ + for (ptr = __IO_list; ptr ; ptr = ptr->next) { + if (ptr == fp) { + if (prev == 0) { + __IO_list = fp->next; + } else { + prev->next = fp->next; } - prev = ptr; + break; } + prev = ptr; } + _free_stdio_stream(fp); /* Finally free the stream if necessary. */ + return rv; } +#endif -/* The following is only called by fclose and _fopen (which calls fclose) */ +#ifdef L__free_stdio_stream +/* The following is only called by fclose and _fopen. */ void _free_stdio_stream(FILE *fp) { int i; + + if (!(fp->mode & __MODE_FREEFIL)) { + return; + } for (i = 0; i < FIXED_STREAMS; i++) { if (fp == _stdio_streams + i) { |