mirror of
https://github.com/MidnightCommander/mc
synced 2024-12-22 20:36:50 +03:00
* view.c (struct WView): Renamed some variables to reflect the
actual use. (view_growbuf_read_until): Moved the growing buffer handling out of get_byte. * view.c: Cleaned up the code. Added error handling for the growing buffer case.
This commit is contained in:
Roland Illig
parent
a6c81a0d7a
commit
91a4d7e764
@ -1,3 +1,11 @@
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2004-12-02 Roland Illig <roland.illig@gmx.de>
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* view.c (struct WView): Renamed some variables to reflect the
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actual use. (view_growbuf_read_until): Moved the growing buffer
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handling out of get_byte.
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* view.c: Cleaned up the code. Added error handling for the
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growing buffer case.
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2004-12-02 Andrew V. Samoilov <sav@bcs.zp.ua>
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* file.c (make_symlink): Constify r.
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220
src/view.c
220
src/view.c
@ -6,6 +6,7 @@
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1996 Joseph M. Hinkle
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1997 Norbert Warmuth
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1998 Pavel Machek
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2004 Roland Illig <roland.illig@gmx.de>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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@ -79,6 +80,7 @@
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/* Offset in bytes into a file */
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typedef unsigned long offset_type;
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#define INVALID_OFFSET ((offset_type) -1)
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#define OFFSETTYPE_MAX (~((offset_type) 0))
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/* A width or height on the screen */
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typedef unsigned int screen_dimen;
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@ -99,13 +101,15 @@ struct WView {
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int have_frame;
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unsigned char *data; /* Memory area for the file to be viewed */
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size_t datasize; /* Number of bytes in the data */
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/* view_update_last_byte() must be called after assignment to datasize */
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/* File information */
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int file; /* File descriptor (for mmap and munmap) */
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FILE *stdfile; /* Stdio struct for reading file in parts */
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int reading_pipe; /* Flag: Reading from pipe(use popen/pclose) */
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offset_type bytes_read; /* How much of file is read */
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int mmapping; /* Did we use mmap on the file? */
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size_t mmappedsize; /* Number of bytes that are mmapped; used only for munmap() */
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/* Display information */
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offset_type last; /* Last byte shown */
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@ -137,7 +141,10 @@ struct WView {
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int growing_buffer; /* Use the growing buffers? */
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char **block_ptr; /* Pointer to the block pointers */
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int blocks; /* The number of blocks in *block_ptr */
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size_t growbuf_lastindex; /* Number of bytes in the last page of the
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growing buffer */
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/* view_update_last_byte() must be called after assignment to
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growing_buffer, blocks, growbuf_lastindex */
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/* Search variables */
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offset_type search_start; /* First character to start searching from */
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@ -159,9 +166,21 @@ struct WView {
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* -1 view previous file
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* 1 view next file
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*/
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struct stat s; /* stat for file */
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};
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static void view_update_last_byte (WView *view)
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{
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if (view->growing_buffer) {
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if (view->blocks == 0)
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view->last_byte = 0;
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else
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view->last_byte = ((offset_type) view->blocks - 1)
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* VIEW_PAGE_SIZE + view->growbuf_lastindex;
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} else
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view->last_byte = view->datasize;
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view->bottom_first = INVALID_OFFSET;
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}
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static void view_move_cursor_to_eol(WView *view)
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{
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offset_type last_line = (view->last_byte - 1) / view->bytes_per_line;
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@ -227,7 +246,7 @@ free_file (WView *view)
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#ifdef HAVE_MMAP
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if (view->mmapping) {
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mc_munmap (view->data, view->s.st_size);
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mc_munmap (view->data, view->mmappedsize);
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close_view_file (view);
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} else
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#endif /* HAVE_MMAP */
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@ -280,56 +299,67 @@ view_done (WView *view)
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static void view_hook (void *);
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/* Copies the output from the pipe to the growing buffer, until either
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* the end-of-pipe is reached or the interval [0..ofs) of the growing
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* buffer is completely filled. */
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static void
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view_growbuf_read_until (WView *view, offset_type ofs)
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{
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ssize_t nread;
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unsigned char *p;
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size_t bytesfree;
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/* g_assert (view->growing_buffer, NULL); */
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while (view->last_byte < ofs) {
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if (view->blocks == 0 || view->growbuf_lastindex == VIEW_PAGE_SIZE) {
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char *newblock = g_try_malloc (VIEW_PAGE_SIZE);
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char **newblocks = g_try_malloc (sizeof (char *) * (view->blocks + 1));
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if (!newblock || !newblocks) {
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g_free (newblock);
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return;
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}
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memcpy (newblocks, view->block_ptr, sizeof (char *) * view->blocks);
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g_free (view->block_ptr);
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view->block_ptr = newblocks;
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view->block_ptr[view->blocks++] = newblock;
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view->growbuf_lastindex = 0;
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view_update_last_byte (view);
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}
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p = view->block_ptr[view->blocks - 1] + view->growbuf_lastindex;
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bytesfree = VIEW_PAGE_SIZE - view->growbuf_lastindex;
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if (view->stdfile != NULL)
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nread = fread (p, 1, bytesfree, view->stdfile);
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else
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nread = mc_read (view->file, p, bytesfree);
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if (nread == -1 || nread == 0)
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return;
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view->growbuf_lastindex += nread;
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view_update_last_byte (view);
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}
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}
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static int
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get_byte (WView *view, unsigned int byte_index)
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{
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int page = byte_index / VIEW_PAGE_SIZE + 1;
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int offset = byte_index % VIEW_PAGE_SIZE;
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int i, n;
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if (view->growing_buffer) {
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if (page > view->blocks) {
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view->block_ptr = g_realloc (view->block_ptr,
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page * sizeof (char *));
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for (i = view->blocks; i < page; i++) {
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char *p = g_try_malloc (VIEW_PAGE_SIZE);
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view->block_ptr[i] = p;
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if (!p)
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return '\n';
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if (view->stdfile != NULL)
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n = fread (p, 1, VIEW_PAGE_SIZE, view->stdfile);
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else
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n = mc_read (view->file, p, VIEW_PAGE_SIZE);
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/*
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* FIXME: Errors are ignored at this point
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* Also should report preliminary EOF
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*/
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if (n != -1)
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view->bytes_read += n;
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if (view->s.st_size < view->bytes_read) {
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view->bottom_first = INVALID_OFFSET; /* Invalidate cache */
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view->s.st_size = view->bytes_read;
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view->last_byte = view->bytes_read;
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if (view->reading_pipe)
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view->last_byte = view->first + view->bytes_read;
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}
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/* To force loading the next page */
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if (n == VIEW_PAGE_SIZE && view->reading_pipe) {
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view->last_byte++;
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}
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}
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view->blocks = page;
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size_t pageno = byte_index / VIEW_PAGE_SIZE;
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size_t pageindex = byte_index % VIEW_PAGE_SIZE;
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view_growbuf_read_until (view, byte_index + 1);
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if (view->blocks == 0)
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return -1;
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if (pageno < view->blocks - 1)
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return view->block_ptr[pageno][pageindex];
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if (pageno == view->blocks - 1 && pageindex < view->growbuf_lastindex)
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return view->block_ptr[pageno][pageindex];
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return -1;
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}
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if (byte_index >= view->bytes_read) {
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return -1;
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} else
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return view->block_ptr[page - 1][offset];
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} else {
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if (byte_index >= view->last_byte)
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return -1;
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else
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return view->data[byte_index];
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}
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/* g_assert (view->data != NULL); */
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if (byte_index < view->datasize)
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return view->data[byte_index];
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return -1;
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}
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static void
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@ -495,8 +525,9 @@ set_view_init_error (WView *view, const char *msg)
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view->first = 0;
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view->last_byte = 0;
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if (msg) {
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view->bytes_read = strlen (msg);
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return g_strdup (msg);
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view->datasize = strlen (msg);
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view_update_last_byte (view);
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return g_strdup (msg);
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}
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return NULL;
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}
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@ -508,10 +539,13 @@ init_growing_view (WView *view, const char *name, const char *filename)
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const char *err_msg = NULL;
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view->growing_buffer = 1;
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view->block_ptr = NULL;
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view->blocks = 0;
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view->growbuf_lastindex = 0; /* unused */
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view_update_last_byte (view);
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if (name) {
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view->reading_pipe = 1;
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view->s.st_size = 0;
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open_error_pipe ();
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if ((view->stdfile = popen (name, "r")) == NULL) {
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@ -522,8 +556,8 @@ init_growing_view (WView *view, const char *name, const char *filename)
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}
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/* First, check if filter produced any output */
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get_byte (view, 0);
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if (view->bytes_read <= 0) {
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view_growbuf_read_until (view, 1);
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if (view->last_byte == 0) {
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pclose (view->stdfile);
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view->stdfile = NULL;
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/* Avoid two messages. Message from stderr has priority. */
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@ -546,26 +580,28 @@ init_growing_view (WView *view, const char *name, const char *filename)
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error message instead of the file buffer (quick_view feature).
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*/
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static char *
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load_view_file (WView *view, int fd)
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load_view_file (WView *view, int fd, const struct stat *st)
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{
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view->file = fd;
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if (view->s.st_size == 0) {
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if (st->st_size == 0) {
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/* Must be one of those nice files that grow (/proc) */
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close_view_file (view);
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return init_growing_view (view, 0, view->filename);
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}
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#ifdef HAVE_MMAP
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if ((size_t) view->s.st_size == view->s.st_size)
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view->data = mc_mmap (0, view->s.st_size, PROT_READ,
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MAP_FILE | MAP_SHARED, view->file, 0);
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if ((size_t) st->st_size == st->st_size)
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view->data = mc_mmap (0, st->st_size, PROT_READ,
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MAP_FILE | MAP_SHARED, view->file, 0);
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else
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view->data = (caddr_t) -1;
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if ((caddr_t) view->data != (caddr_t) - 1) {
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/* mmap worked */
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view->first = 0;
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view->bytes_read = view->s.st_size;
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view->mmappedsize = st->st_size;
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view->datasize = st->st_size;
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view->mmapping = 1;
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view_update_last_byte (view);
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return NULL;
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}
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#endif /* HAVE_MMAP */
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@ -575,20 +611,21 @@ load_view_file (WView *view, int fd)
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* for any reason, so we use this as fallback (pavel@ucw.cz) */
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/* Make sure view->s.st_size is not truncated when passed to g_malloc */
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if ((gulong) view->s.st_size == view->s.st_size)
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view->data = (unsigned char *) g_try_malloc ((gulong) view->s.st_size);
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if ((gulong) st->st_size == st->st_size)
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view->data = (unsigned char *) g_try_malloc ((gulong) st->st_size);
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else
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view->data = NULL;
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if (view->data == NULL || mc_lseek (view->file, 0, SEEK_SET) != 0
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|| mc_read (view->file, view->data,
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view->s.st_size) != view->s.st_size) {
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st->st_size) != st->st_size) {
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g_free (view->data);
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close_view_file (view);
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return init_growing_view (view, 0, view->filename);
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}
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view->first = 0;
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view->bytes_read = view->s.st_size;
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view->datasize = st->st_size;
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view_update_last_byte (view);
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return NULL;
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}
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@ -601,23 +638,24 @@ do_view_init (WView *view, const char *_command, const char *_file,
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int i, type;
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int fd = -1;
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char tmp[BUF_MEDIUM];
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struct stat st;
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if (view->view_active)
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view_done (view);
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/* Set up the state */
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view->block_ptr = 0;
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view->data = NULL;
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view->datasize = 0;
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view->growing_buffer = 0;
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view->reading_pipe = 0;
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view->mmapping = 0;
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view->blocks = 0;
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view->block_ptr = 0;
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view->first = view->bytes_read = 0;
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view->last_byte = 0;
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view->block_ptr = NULL;
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view->first = 0;
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view->filename = g_strdup (_file);
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view->command = 0;
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view->last = view->first + ((LINES - 2) * view->bytes_per_line);
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view_update_last_byte (view);
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/* Clear the markers */
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view->marker = 0;
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@ -642,7 +680,7 @@ do_view_init (WView *view, const char *_command, const char *_file,
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}
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/* Make sure we are working with a regular file */
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if (mc_fstat (fd, &view->s) == -1) {
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if (mc_fstat (fd, &st) == -1) {
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mc_close (fd);
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g_snprintf (tmp, sizeof (tmp), _(" Cannot stat \"%s\"\n %s "),
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_file, unix_error_string (errno));
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@ -650,7 +688,7 @@ do_view_init (WView *view, const char *_command, const char *_file,
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goto finish;
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}
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if (!S_ISREG (view->s.st_mode)) {
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if (!S_ISREG (st.st_mode)) {
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mc_close (fd);
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g_snprintf (tmp, sizeof (tmp),
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_(" Cannot view: not a regular file "));
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@ -673,7 +711,7 @@ do_view_init (WView *view, const char *_command, const char *_file,
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g_strconcat (_file, decompress_extension (type), (char *) NULL);
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}
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error = load_view_file (view, fd);
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error = load_view_file (view, fd, &st);
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}
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finish:
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@ -699,10 +737,10 @@ do_view_init (WView *view, const char *_command, const char *_file,
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/* Special case: The data points to the error message */
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if (error) {
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view->data = error;
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view->datasize = strlen (error);
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view_update_last_byte (view);
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view->file = -1;
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view->s.st_size = view->bytes_read = strlen (view->data);
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}
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view->last_byte = view->first + view->s.st_size;
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if (start_line > 1 && !error) {
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int saved_wrap_mode = view->wrap_mode;
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@ -759,14 +797,12 @@ view_percent (WView *view, int p, int w, gboolean update_gui)
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{
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int percent;
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percent = (view->s.st_size == 0
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|| view->last_byte == view->last) ? 100 : (p >
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(INT_MAX /
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100) ? p /
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(view->s.
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st_size /
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100) : p * 100 /
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view->s.st_size);
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if (view->last_byte == 0 || view->last_byte == view->last)
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percent = 100;
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else if (p > (INT_MAX / 100))
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percent = p / (view->last_byte / 100);
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else
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percent = p * 100 / view->last_byte;
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#if 0
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percent = view->s.st_size == 0 ? 100 :
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@ -813,7 +849,7 @@ view_status (WView *view, gboolean update_gui)
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}
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if (w > 62) {
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widget_move (view, view->have_frame, 43 + view->have_frame);
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printw (const_cast(char *, _("%s bytes")), size_trunc (view->s.st_size));
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printw (const_cast(char *, _("%s bytes")), size_trunc (view->last_byte));
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}
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if (w > 70) {
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printw (" ");
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@ -1068,10 +1104,8 @@ display (WView *view)
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}
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}
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} else {
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if (view->growing_buffer && from == view->last_byte)
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get_byte (view, from);
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for (; row < height && from < view->last_byte; from++) {
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c = get_byte (view, from);
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/* the get_byte() call below might modify view->last_byte */
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for (; row < height && ((void) (c = get_byte (view, from)), from < view->last_byte); from++) {
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if ((c == '\n') || (col >= width && view->wrap_mode)) {
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col = frame_shift;
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row++;
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@ -1384,15 +1418,8 @@ get_bottom_first (WView *view, int do_not_cache, int really)
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return view->bottom_first;
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/* Force loading */
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if (view->growing_buffer) {
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offset_type old_last_byte;
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old_last_byte = INVALID_OFFSET;
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while (old_last_byte != view->last_byte) {
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old_last_byte = view->last_byte;
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get_byte (view, view->last_byte + VIEW_PAGE_SIZE);
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}
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}
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if (view->growing_buffer)
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view_growbuf_read_until (view, OFFSETTYPE_MAX);
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bottom_first = move_backward2 (view, view->last_byte, vheight - 1);
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@ -1609,7 +1636,7 @@ static offset_type update_activate;
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static void
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||||
search_update_steps (WView *view)
|
||||
{
|
||||
if (view->s.st_size)
|
||||
if (view->last_byte != 0)
|
||||
update_steps = 40000;
|
||||
else /* viewing a data stream, not a file */
|
||||
update_steps = view->last_byte / 100;
|
||||
@ -2784,7 +2811,6 @@ view_new (int y, int x, int cols, int lines, int is_panel)
|
||||
view->viewer_magic_flag = default_magic_flag;
|
||||
view->viewer_nroff_flag = default_nroff_flag;
|
||||
view->have_frame = is_panel;
|
||||
view->last_byte = -1;
|
||||
view->wrap_mode = global_wrap_mode;
|
||||
|
||||
widget_want_cursor (view->widget, 0);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user