file.c

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/* file.c - Additional file attributes
 
   Copyright (C) 1993 Werner Almesberger <werner.almesberger@lrc.di.epfl.ch>
   Copyright (C) 1998 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
   Copyright (C) 2008-2014 Daniel Baumann <mail@daniel-baumann.ch>
 
   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
 
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
   GNU General Public License for more details.
 
   You should have received a copy of the GNU General Public License
   along with this program. If not, see <http://www.gnu.org/licenses/>.
 
   The complete text of the GNU General Public License
   can be found in /usr/share/common-licenses/GPL-3 file.
*/
 
/* FAT32, VFAT, Atari format support, and various fixes additions May 1998
 * by Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de> */
 
#include "vfatlib.h"
 
#define NDEBUG
#include <debug.h>
 
FDSC *fp_root = NULL;
 
static void put_char(char **p, unsigned char c)
{
#ifndef __REACTOS__
    if (dos_char_to_printable(p, c))
    return;
#endif
    if ((c >= ' ' && c < 0x7f) || c >= 0xa0)
    *(*p)++ = c;
    else {
    *(*p)++ = '\\';
    *(*p)++ = '0' + (c >> 6);
    *(*p)++ = '0' + ((c >> 3) & 7);
    *(*p)++ = '0' + (c & 7);
    }
}
 
char *file_name(unsigned char *fixed)
{
    static char path[MSDOS_NAME * 4 + 2];
    char *p;
    int i, j;
 
    p = path;
    for (i = j = 0; i < 8; i++)
    if (fixed[i] != ' ') {
        while (j++ < i)
        *p++ = ' ';
        put_char(&p, fixed[i]);
    }
    if (strncmp((const char *)(fixed + 8), "   ", 3)) {
    *p++ = '.';
    for (i = j = 0; i < 3; i++)
        if (fixed[i + 8] != ' ') {
        while (j++ < i)
            *p++ = ' ';
        put_char(&p, fixed[i + 8]);
        }
    }
    *p = 0;
    return path;
}
 
int file_cvt(unsigned char *name, unsigned char *fixed)
{
    unsigned char c;
    int size, ext, cnt;
 
    size = 8;
    ext = 0;
    while (*name) {
    c = *name;
    if (c < ' ' || c > 0x7e || strchr("*?<>|\"/", c)) {
        printf("Invalid character in name. Use \\ooo for special "
           "characters.\n");
        return 0;
    }
    if (c == '.') {
        if (ext) {
        printf("Duplicate dots in name.\n");
        return 0;
        }
        while (size--)
        *fixed++ = ' ';
        size = 3;
        ext = 1;
        name++;
        continue;
    }
    if (c == '\\') {
        c = 0;
        name++;
        for (cnt = 3; cnt; cnt--) {
        if (*name < '0' || *name > '7') {
            printf("Expected three octal digits.\n");
            return 0;
        }
        c = c * 8 + *name++ - '0';
        }
        name--;
    }
    if (islower(c))
        c = toupper(c);
    if (size) {
        *fixed++ = c;
        size--;
    }
    name++;
    }
    if (*name || size == 8)
    return 0;
    if (!ext) {
    while (size--)
        *fixed++ = ' ';
    size = 3;
    }
    while (size--)
    *fixed++ = ' ';
    return 1;
}
 
void file_add(char *path, FD_TYPE type)
{
    FDSC **current, *walk;
    char name[MSDOS_NAME];
    char *here;
 
    current = &fp_root;
    if (*path != '/')
    die("%s: Absolute path required.", path);
    path++;
    while (1) {
    if ((here = strchr(path, '/')))
        *here = 0;
    if (!file_cvt((unsigned char *)path, (unsigned char *)name))
        exit(2);
    for (walk = *current; walk; walk = walk->next)
        if (!here && (!strncmp(name, walk->name, MSDOS_NAME) || (type ==
                                     fdt_undelete
                                     &&
                                     !strncmp
                                     (name + 1,
                                      walk->name
                                      + 1,
                                      MSDOS_NAME
                                      - 1))))
        die("Ambiguous name: \"%s\"", path);
        else if (here && !strncmp(name, walk->name, MSDOS_NAME))
        break;
    if (!walk) {
        walk = alloc(sizeof(FDSC));
        strncpy(walk->name, name, MSDOS_NAME);
        walk->type = here ? fdt_none : type;
        walk->first = NULL;
        walk->next = *current;
        *current = walk;
    }
    current = &walk->first;
    if (!here)
        break;
    *here = '/';
    path = here + 1;
    }
}
 
FDSC **file_cd(FDSC ** curr, char *fixed)
{
    FDSC **walk;
 
    if (!curr || !*curr)
    return NULL;
    for (walk = curr; *walk; walk = &(*walk)->next)
    if (!strncmp((*walk)->name, fixed, MSDOS_NAME) && (*walk)->first)
        return &(*walk)->first;
    return NULL;
}
 
static FDSC **file_find(FDSC ** dir, char *fixed)
{
    if (!dir || !*dir)
    return NULL;
    if (*(unsigned char *)fixed == DELETED_FLAG) {
    while (*dir) {
        if (!strncmp((*dir)->name + 1, fixed + 1, MSDOS_NAME - 1)
        && !(*dir)->first)
        return dir;
        dir = &(*dir)->next;
    }
    return NULL;
    }
    while (*dir) {
    if (!strncmp((*dir)->name, fixed, MSDOS_NAME) && !(*dir)->first)
        return dir;
    dir = &(*dir)->next;
    }
    return NULL;
}
 
/* Returns the attribute of the file FIXED in directory CURR or FDT_NONE if no
   such file exists or if CURR is NULL. */
FD_TYPE file_type(FDSC ** curr, char *fixed)
{
    FDSC **this;
 
    if ((this = file_find(curr, fixed)))
    return (*this)->type;
    return fdt_none;
}
 
void file_modify(FDSC ** curr, char *fixed)
{
    FDSC **this, *next;
 
    if (!(this = file_find(curr, fixed)))
    die("Internal error: file_find failed");
    switch ((*this)->type) {
    case fdt_drop:
    printf("Dropping %s\n", file_name((unsigned char *)fixed));
    *(unsigned char *)fixed = DELETED_FLAG;
    break;
    case fdt_undelete:
    *fixed = *(*this)->name;
    printf("Undeleting %s\n", file_name((unsigned char *)fixed));
    break;
    default:
    die("Internal error: file_modify");
    }
    next = (*this)->next;
    free(*this);
    *this = next;
}
 
static void report_unused(FDSC * this)
{
    FDSC *next;
 
    while (this) {
    next = this->next;
    if (this->first)
        report_unused(this->first);
    else if (this->type != fdt_none)
        printf("Warning: did not %s file %s\n", this->type == fdt_drop ?
           "drop" : "undelete", file_name((unsigned char *)this->name));
    free(this);
    this = next;
    }
}
 
void file_unused(void)
{
    report_unused(fp_root);
}