alloc_rootdir_entry scan_root

loff_t alloc_rootdir_entry ( DOS_FS *  fs, DIR_ENT *  de, const char *  pattern  ) Definition at line 51 of file check.c. Referenced by reclaim_file(). { static int curr_num = 0; loff_t offset; if (fs->root_cluster) { DIR_ENT d2; int i = 0, got = 0; unsigned long clu_num, prev = 0; loff_t offset2; clu_num = fs->root_cluster; offset = cluster_start(fs,clu_num); while (clu_num > 0 && clu_num != -1) { fs_read(offset,sizeof(DIR_ENT),&d2); if (IS_FREE(d2.name) && d2.attr != VFAT_LN_ATTR) { got = 1; break; } i += sizeof(DIR_ENT); offset += sizeof(DIR_ENT); if ((i % fs->cluster_size) == 0) { prev = clu_num; if ((clu_num = next_cluster(fs,clu_num)) == 0 || clu_num == -1) break; offset = cluster_start(fs,clu_num); } } if (!got) { /* no free slot, need to extend root dir: alloc next free cluster * after previous one */ if (!prev) die("Root directory has no cluster allocated!"); for (clu_num = prev+1; clu_num != prev; clu_num++) { if (clu_num >= fs->clusters+2) clu_num = 2; if (!fs->fat[clu_num].value) break; } if (clu_num == prev) die("Root directory full and no free cluster"); set_fat(fs,prev,clu_num); set_fat(fs,clu_num,-1); set_owner(fs, clu_num, get_owner(fs, fs->root_cluster)); /* clear new cluster */ memset( &d2, 0, sizeof(d2) ); offset = cluster_start(fs,clu_num); for( i = 0; i < (int)fs->cluster_size; i += sizeof(DIR_ENT) ) fs_write( offset+i, sizeof(d2), &d2 ); } memset(de,0,sizeof(DIR_ENT)); while (1) { sprintf((char*)de->name,pattern,curr_num); clu_num = fs->root_cluster; i = 0; offset2 = cluster_start(fs,clu_num); while (clu_num > 0 && clu_num != -1) { fs_read(offset2,sizeof(DIR_ENT),&d2); if (offset2 != offset && !strncmp((char*)d2.name,(char*)de->name,MSDOS_NAME)) break; i += sizeof(DIR_ENT); offset2 += sizeof(DIR_ENT); if ((i % fs->cluster_size) == 0) { if ((clu_num = next_cluster(fs,clu_num)) == 0 || clu_num == -1) break; offset2 = cluster_start(fs,clu_num); } } if (clu_num == 0 || clu_num == -1) break; if (++curr_num >= 10000) die("Unable to create unique name"); } } else { DIR_ENT *root; int next_free = 0, scan; root = vfalloc(fs->root_entries*sizeof(DIR_ENT)); fs_read(fs->root_start,fs->root_entries*sizeof(DIR_ENT),root); while (next_free < (int)fs->root_entries) if (IS_FREE(root[next_free].name) && root[next_free].attr != VFAT_LN_ATTR) break; else next_free++; if (next_free == (int)fs->root_entries) die("Root directory is full."); offset = fs->root_start+next_free*sizeof(DIR_ENT); memset(de,0,sizeof(DIR_ENT)); while (1) { sprintf((char*)de->name,pattern,curr_num); for (scan = 0; scan < (int)fs->root_entries; scan++) if (scan != next_free && !strncmp((char*)root[scan].name,(char*)de->name,MSDOS_NAME)) break; if (scan == (int)fs->root_entries) break; if (++curr_num >= 10000) die("Unable to create unique name"); } vffree(root); } ++FsCheckTotalFiles; return offset; }