Subversion Repositories SvarDOS

/*

 * This file is part of the pkg (SvarDOS) project.

 * Copyright (C) Mateusz Viste 2012-2022

 */

#include <ctype.h>    /* toupper() */

#include <stdio.h>

#include <string.h>    /* strlen() */

#include <stdlib.h>    /* free() */

#include <unistd.h>    /* rmdir(), unlink() */

#include <direct.h>  /* watcom needs this for the rmdir() prototype */

#include "helpers.h"   /* slash2backslash() */

#include "kprintf.h"

#include "pkgrem.h"

struct dirliststruct {

  struct dirliststruct *next;

  char dirname[2]; /* this must be the last item in the structure */

};

/* adds a directory to dirlist, if not already present */

static struct dirliststruct *rememberdir(struct dirliststruct *dirlist, const char *path) {

  struct dirliststruct *res;

  /* if already present, do nothing */

  for (res = dirlist; res != NULL; res = res->next) {

    if (strcasecmp(res->dirname, path) == 0) return(dirlist);

  }

  /* not in the list yet - add it */

  res = malloc(sizeof(struct dirliststruct) + strlen(path));

  if (res == NULL) {  /* out of memory */

    kitten_printf(4, 3, path); /* "Out of memory! Could not store directory %s!" */

    puts("");

    return(NULL);

  }

  strcpy(res->dirname, path);

  res->next = dirlist;

  return(res);

}

/* explode a path into subdirectories, and remember each one inside dirlist */

static struct dirliststruct *rememberpath(struct dirliststruct *dirlist, char *path) {

  int x, gameover = 0;

  /* iterate on the path, and add each subdirectory */

  for (x = 0;; x++) {

    switch (path[x]) {

      case 0:

        gameover = 1;

      case '/':

      case '\\':

        path[x] = 0;

        dirlist = rememberdir(dirlist, path);

        path[x] = '\\';

    }

    if (gameover != 0) break;

  }

  return(dirlist);

}

/* removes a package from the system. Returns 0 on success, non-zero otherwise */

int pkgrem(const char *pkgname, const char *dosdir) {

  char fpath[256];

  char buff[256];

  FILE *flist;

  int lastdirsep;

  struct dirliststruct *dirlist = NULL; /* used to remember directories to remove */

  /* open the file %DOSDIR%\packages\pkgname.lst */

  sprintf(fpath, "%s\\packages\\%s.lst", dosdir, pkgname);

  flist = fopen(fpath, "rb");

  if (flist == NULL) {

    kitten_printf(4, 0, pkgname); /* "Package %s is not installed, so not removed." */

    puts("");

    return(-1);

  }

  /* remove all files/folders listed in pkgname.lst but NOT pkgname.lst */

  while (freadtokval(flist, buff, sizeof(buff), NULL, 0) == 0) {

    int x;

    slash2backslash(buff); /* change all slash to backslash */

    if (buff[0] == 0) continue; /* skip empty lines */

    /* remember the path part for removal later */

    lastdirsep = -1;

    for (x = 1; buff[x] != 0; x++) {

      if ((buff[x] == '\\') && (buff[x - 1] != ':')) lastdirsep = x;

    }

    if (lastdirsep > 0) {

      buff[lastdirsep] = 0;

      dirlist = rememberpath(dirlist, buff);

      buff[lastdirsep] = '\\';

    }

    /* if it's a directory, skip it */

    if (buff[strlen(buff) - 1] == '\\') continue;

    /* do not delete pkgname.lst at this point - I am using it (will be deleted later) */

    if (strcasecmp(buff, fpath) == 0) continue;

    /* remove it */

    kitten_printf(4, 4, buff); /* "removing %s" */

    puts("");

    unlink(buff);

  }

  /* close the lst file */

  fclose(flist);

  /* iterate over dirlist and remove directories if empty, from longest to shortest */

  while (dirlist != NULL) {

    struct dirliststruct *dirlistpos, *previousdir;

    /* find the longest path, and put it on top */

    previousdir = dirlist;

    for (dirlistpos = dirlist->next; dirlistpos != NULL; dirlistpos = dirlistpos->next) {

      if (strlen(dirlistpos->dirname) > strlen(dirlist->dirname)) {

        previousdir->next = dirlistpos->next;

        dirlistpos->next = dirlist;

        dirlist = dirlistpos;

        dirlistpos = previousdir;

      } else {

        previousdir = dirlistpos;

      }

    }

    /* printf("RMDIR %s\n", dirlist->dirname); */

    rmdir(dirlist->dirname);

    /* free the allocated memory for this entry */

    dirlistpos = dirlist;

    dirlist = dirlistpos->next;

    free(dirlistpos);

  }

  /* remove the lst file */

  unlink(fpath);

  kitten_printf(4, 5, pkgname); /* "Package %s has been removed." */

  puts("");

  return(0);

}