Subversion Repositories SvarDOS

/*

 * This file is part of pkg (SvarDOS).

 * Copyright (C) 2012-2021 Mateusz Viste

 */

#include <stdio.h>  /* printf(), fclose(), fopen()... */

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

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

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

#include "kprintf.h"

#include "loadconf.h"

void freeconf(struct customdirs **dirlist) {

  struct customdirs *curpos;

  /* free the linked list of custom dirs */

  while (*dirlist != NULL) {

    curpos = *dirlist;

    *dirlist = (*dirlist)->next;

    free(curpos);

  }

}

static int checkfordoubledirlist(const struct customdirs *dirlist) {

  struct customdirs *curpos;

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

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

      if (strcasecmp(curpos->name, dirlist->name) == 0) {

        kitten_printf(7, 0, curpos->name); /* "ERROR: custom dir '%s' is listed twice!" */

        puts("");

        return(-1);

      }

    }

  }

  return(0);

}

/* validates dirlist entries: check that they are absolute paths and are not using restricted names */

static int validatedirlist(const struct customdirs *dirlist) {

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

    /* the location must be at least 3 characters long to be a valid absolute path (like 'c:\')*/

    if (strlen(dirlist->location) < 3) {

      kitten_printf(7, 15, dirlist->name); /* "ERROR: custom dir '%s' is not a valid absolute path!" */

      puts("");

      return(-1);

    }

    /* is it a valid absolute path? should start with [a..Z]:\ */

    if ((dirlist->location[1] != ':') ||

       ((dirlist->location[2] != '/') && (dirlist->location[2] != '\\')) ||

       (((dirlist->location[0] < 'a') || (dirlist->location[0] > 'z')) && ((dirlist->location[0] < 'A') || (dirlist->location[0] > 'Z')))) {

      kitten_printf(7, 15, dirlist->name); /* "ERROR: custom dir '%s' is not a valid absolute path!" */

      puts("");

      return(-1);

    }

    /* check for forbidden names */

    if ((strcasecmp(dirlist->name, "appinfo") == 0) ||

        (strcasecmp(dirlist->name, "bin") == 0) ||

        (strcasecmp(dirlist->name, "doc") == 0) ||

        (strcasecmp(dirlist->name, "help") == 0) ||

        (strcasecmp(dirlist->name, "nls") == 0) ||

        (strcasecmp(dirlist->name, "packages") == 0)) {

      kitten_printf(7, 16, dirlist->name); /* "ERROR: custom dir '%s' is a reserved name!" */

      puts("");

      return(-1);

    }

  }

  return(0);

}

/* add (and allocates) a new custom dir entry to dirlist. Returns 0 on success,

   or non-zero on failure (failures happen on out of memory events). */

static int addnewdir(struct customdirs **dirlist, const char *name, const char *location) {

  struct customdirs *newentry;

  if (strlen(name) >= sizeof(newentry->name)) return(-2);

  newentry = malloc(sizeof(struct customdirs) + strlen(location) + 1);

  if (newentry == NULL) return(-1);

  strcpy(newentry->name, name);

  strcpy(newentry->location, location);

  newentry->next = *dirlist;

  *dirlist = newentry;

  return(0);

}

int loadconf(const char *dosdir, struct customdirs **dirlist) {

  FILE *fd;

  char *value = NULL;

  char token[512];

  int nline = 0;

  snprintf(token, sizeof(token), "%s\\cfg\\pkg.cfg", dosdir);

  fd = fopen(token, "r");

  if (fd == NULL) {

    kitten_printf(7, 1, token); /* "ERROR: Could not open config file (%s)!" */

    puts("");

    return(-1);

  }

  *dirlist = NULL;

  /* read the config file line by line */

  while (freadtokval(fd, token, sizeof(token), &value, ' ') == 0) {

    nline++;

    /* skip comments and empty lines */

    if ((token[0] == '#') || (token[0] == 0)) continue;

    if ((value == NULL) || (value[0] == 0)) {

      kitten_printf(7, 4, nline); /* "Warning: token with empty value on line #%d" */

      puts("");

      continue;

    }

    /* printf("token='%s' ; value = '%s'\n", token, value); */

    if (strcasecmp(token, "DIR") == 0) { /* custom directory entry */

      char *location = NULL;

      int i;

      /* find nearer space */

      for (i = 0; (value[i] != ' ') && (value[i] != 0); i++);

      if (value[i] == 0) {

        kitten_printf(7, 11, nline); /* "Warning: Invalid 'DIR' directive found at line #%d" */

        puts("");

        continue;

      }

      value[i] = 0;

      location = value + i + 1;

      /* add the entry to the list */

      slash2backslash(location);

      removeDoubleBackslashes(location);

      if (location[strlen(location) - 1] != '\\') strcat(location, "\\"); /* make sure to end dirs with a backslash */

      if (addnewdir(dirlist, value, location) != 0) {

        kitten_printf(2, 14, "addnewdir"); /* "Out of memory! (%s)" */

        puts("");

        freeconf(dirlist);

        fclose(fd);

        return(-1);

      }

    } else { /* unknown token */

      kitten_printf(7, 8, token, nline); /* "Warning: Unknown token '%s' at line #%d" */

      puts("");

    }

  }

  fclose(fd);

  /* perform some validations */

  if ((checkfordoubledirlist(*dirlist) != 0) || (validatedirlist(*dirlist) != 0)) {

    freeconf(dirlist);

    return(-1);

  }

  return(0);

}