362 lines
10 KiB
C
362 lines
10 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2007 Bryan Childs
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* Copyright (c) 2007 Alexander Levin
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "shortcuts.h"
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#define SHORTCUTS_FILENAME "/shortcuts.link"
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#define PATH_DISP_SEPARATOR "\t"
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#define PATH_DISP_SEPARATOR_LEN 1 /* strlen(PATH_DISP_SEPARATOR) */
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#define CONTROL_PREFIX "#"
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#define CONTROL_PREFIX_LEN 1 /* strlen(CONTROL_PREFIX) */
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#define NAME_VALUE_SEPARATOR "="
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#define NAME_VALUE_SEPARATOR_LEN 1 /* strlen(NAME_VALUE_SEPARATOR) */
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#define INSTR_DISPLAY_LAST_SEGMENTS "Display last path segments"
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/* Memory (will be used for entries) */
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void *memory_buf;
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size_t memory_bufsize; /* Size of memory_buf in bytes */
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/* The file we're processing */
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sc_file_t sc_file;
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bool parse_entry_content(char *line, sc_entry_t *entry, int last_segm);
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char *last_segments(char *path, int nsegm);
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bool is_control(char *line, sc_file_t *file);
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bool starts_with(char *string, char *prefix);
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bool parse_name_value(char *line, char *name, int namesize,
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char *value, int valuesize);
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void write_entry_to_file(int fd, sc_entry_t *entry);
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void write_int_instruction_to_file(int fd, char *instr, int value);
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void allocate_memory(void **buf, size_t *bufsize)
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{
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*buf = rb->plugin_get_buffer(bufsize);
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DEBUGF("Got %ld bytes of memory\n", *bufsize);
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}
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void init_sc_file(sc_file_t *file, void *buf, size_t bufsize)
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{
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file->entries = (sc_entry_t*)buf;
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file->max_entries = bufsize / sizeof(sc_entry_t);
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DEBUGF("Buffer capacity: %d entries\n", file->max_entries);
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file->entry_cnt = 0;
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file->show_last_segments = -1;
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}
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bool load_sc_file(sc_file_t *file, char *filename, bool must_exist,
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void *entry_buf, size_t entry_bufsize)
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{
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int fd = -1;
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bool ret_val = false; /* Assume bad case */
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int amountread = 0;
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char sc_content[2*MAX_PATH];
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sc_entry_t entry;
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/* We start to load a new file -> prepare it */
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init_sc_file(&sc_file, entry_buf, entry_bufsize);
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fd = rb->open(filename, O_RDONLY);
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if (fd < 0) {
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/* The file didn't exist on disk */
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if (!must_exist) {
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DEBUGF("Trying to create link file '%s'...\n", filename);
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fd = rb->creat(filename, 0666);
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if (fd < 0){
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/* For some reason we couldn't create the file,
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* so return an error message and exit */
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rb->splashf(HZ*2, "Couldn't create the shortcuts file %s",
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filename);
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goto end_of_proc;
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}
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/* File created, but there's nothing in it, so just exit */
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ret_val = true;
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goto end_of_proc;
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} else {
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rb->splashf(HZ, "Couldn't open %s", filename);
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goto end_of_proc;
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}
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}
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while ((amountread=rb->read_line(fd,sc_content, sizeof(sc_content)))) {
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if (is_control(sc_content, file)) {
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continue;
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}
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if (file->entry_cnt >= file->max_entries) {
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rb->splashf(HZ*2, "Too many entries in the file, max allowed: %d",
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file->max_entries);
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goto end_of_proc;
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}
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if (!parse_entry_content(sc_content, &entry,file->show_last_segments)) {
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/* Could not parse the entry (too long path?) -> ignore */
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DEBUGF("Could not parse '%s' -> ignored\n", sc_content);
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continue;
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}
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DEBUGF("Parsed entry: path=%s, disp=%s\n", entry.path, entry.disp);
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append_entry(file, &entry);
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}
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#ifdef SC_DEBUG
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print_file(file);
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#endif
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ret_val = true; /* Everything went ok */
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end_of_proc:
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if (fd >= 0) {
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rb->close(fd);
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fd = -1;
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}
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return ret_val;
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}
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#ifdef SC_DEBUG
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void print_file(sc_file_t *file)
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{
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DEBUGF("Number of entries : %d\n", file->entry_cnt);
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DEBUGF("Show Last Segments: %d\n", file->show_last_segments);
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int i;
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sc_entry_t *entry;
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for (i=0, entry=file->entries; i<file->entry_cnt; i++,entry++) {
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if (entry->explicit_disp) {
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DEBUGF("%2d. '%s', show as '%s'\n", i+1, entry->path, entry->disp);
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} else {
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DEBUGF("%2d. '%s' (%s)\n", i+1, entry->path, entry->disp);
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}
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}
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}
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#endif
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bool append_entry(sc_file_t *file, sc_entry_t *entry)
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{
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if (file->entry_cnt >= file->max_entries) {
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return false;
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}
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rb->memcpy(file->entries+file->entry_cnt, entry, sizeof(*entry));
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file->entry_cnt++;
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return true;
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}
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bool remove_entry(sc_file_t *file, int entry_idx)
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{
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if ((entry_idx<0) || (entry_idx>=file->entry_cnt)) {
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return false;
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}
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sc_entry_t *start = file->entries + entry_idx;
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rb->memmove(start, start + 1,
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(file->entry_cnt-entry_idx-1) * sizeof(sc_entry_t));
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file->entry_cnt--;
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return true;
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}
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bool is_valid_index(sc_file_t *file, int entry_idx)
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{
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return (entry_idx >= 0) && (entry_idx < file->entry_cnt);
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}
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bool parse_entry_content(char *line, sc_entry_t *entry, int last_segm)
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{
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char *sep;
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char *path, *disp;
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unsigned int path_len, disp_len;
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bool expl;
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sep = rb->strcasestr(line, PATH_DISP_SEPARATOR);
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expl = (sep != NULL);
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if (expl) {
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/* Explicit name for the entry is specified -> use it */
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path = line;
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path_len = sep - line;
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disp = sep + PATH_DISP_SEPARATOR_LEN;
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disp_len = rb->strlen(disp);
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} else {
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/* No special name to display */
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path = line;
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path_len = rb->strlen(line);
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if (last_segm <= 0) {
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disp = path;
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} else {
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disp = last_segments(line, last_segm);
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}
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disp_len = rb->strlen(disp);
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}
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if (path_len >= sizeof(entry->path) || disp_len >= sizeof(entry->disp)) {
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DEBUGF("Bad entry: pathlen=%d, displen=%d\n", path_len, disp_len);
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return false;
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}
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rb->strlcpy(entry->path, path, path_len + 1);
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rb->strcpy(entry->disp, disp); /* Safe since we've checked the length */
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entry->explicit_disp = expl;
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return true;
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}
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char *last_segments(char *path, int nsegm)
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{
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/* don't count one trailing separator */
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char *p = path+rb->strlen(path)-PATH_SEPARATOR_LEN;
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int seg_cnt = 0;
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if(p <= path)
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return path;
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while ((p > path) && (seg_cnt < nsegm)) {
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p--;
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if (!starts_with(p, PATH_SEPARATOR)) {
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continue;
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}
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seg_cnt++;
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if (seg_cnt == nsegm && p > path) {
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p++; /* Eat the '/' to show that something has been truncated */
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}
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}
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return p;
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}
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bool is_control(char *line, sc_file_t *file)
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{
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char name[MAX_PATH], value[MAX_PATH];
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if (!starts_with(line, CONTROL_PREFIX)) {
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return false;
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}
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line += CONTROL_PREFIX_LEN;
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if (!parse_name_value(line, name, sizeof(name),
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value, sizeof(value))) {
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DEBUGF("Bad processing instruction: '%s'\n", line);
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return true;
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}
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/* Process control instruction */
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if (rb->strcasestr(name, INSTR_DISPLAY_LAST_SEGMENTS)) {
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file->show_last_segments = rb->atoi(value);
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DEBUGF("Set show last segms to %d\n", file->show_last_segments);
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} else {
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/* Unknown instruction -> ignore */
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DEBUGF("Unknown processing instruction: '%s'\n", name);
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}
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return true;
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}
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bool starts_with(char *string, char *prefix)
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{
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unsigned int pfx_len = rb->strlen(prefix);
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if (rb->strlen(string) < pfx_len)
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return false;
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return (rb->strncmp(string, prefix, pfx_len) == 0);
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}
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bool parse_name_value(char *line, char *name, int namesize,
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char *value, int valuesize)
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{
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char *sep;
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int name_len, val_len;
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name[0] = value[0] = '\0';
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sep = rb->strcasestr(line, NAME_VALUE_SEPARATOR);
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if (sep == NULL) {
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/* No separator char -> weird instruction */
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return false;
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}
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name_len = sep - line;
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if (name_len >= namesize) {
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/* Too long name */
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return false;
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}
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rb->strlcpy(name, line, name_len + 1);
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val_len = rb->strlen(line) - name_len - NAME_VALUE_SEPARATOR_LEN;
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if (val_len >= valuesize) {
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/* Too long value */
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return false;
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}
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rb->strlcpy(value, sep+NAME_VALUE_SEPARATOR_LEN, val_len+1);
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return true;
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}
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bool dump_sc_file(sc_file_t *file, char *filename)
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{
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DEBUGF("Dumping shortcuts to the file '%s'\n", filename);
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int fd;
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/* ideally, we should just write a new
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* entry to the file, but I'm going to
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* be lazy, and just re-write the whole
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* thing. */
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fd = rb->open(filename, O_WRONLY|O_TRUNC);
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if (fd < 0) {
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rb->splashf(HZ*2, "Could not open shortcuts file %s for writing",
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filename);
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return false;
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}
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/*
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* Write instructions
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*/
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/* Always dump the 'display last segms' settings (even it it's
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* not active) so that it can be easily changed without having
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* to remember the setting name */
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write_int_instruction_to_file(fd,
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INSTR_DISPLAY_LAST_SEGMENTS, file->show_last_segments);
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int i;
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sc_entry_t *entry;
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for (i=0, entry=file->entries; i<file->entry_cnt; i++,entry++) {
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write_entry_to_file(fd, entry);
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}
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rb->close(fd);
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DEBUGF("Dumped %d entries to the file '%s'\n", file->entry_cnt, filename);
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return true;
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}
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void write_int_instruction_to_file(int fd, char *instr, int value)
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{
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rb->fdprintf(fd, "%s%s%s%d\n", CONTROL_PREFIX, instr,
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NAME_VALUE_SEPARATOR, value);
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}
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void write_entry_to_file(int fd, sc_entry_t *entry)
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{
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rb->fdprintf(fd, "%s", entry->path);
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if (entry->explicit_disp) {
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rb->fdprintf(fd, "%s%s", PATH_DISP_SEPARATOR, entry->disp);
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}
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rb->fdprintf(fd, "\n");
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}
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