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Sourcecode: jitterbug version File versions

list.c

/* 
   The JitterBug bug tracking system
   list handling utility functions

   Copyright (C) Dan Shearer 1997
   Copyright (C) Andrew Tridgell 1997

   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

   This module handles simple lists of strings terminated by a NULL string

*/

#include "jitterbug.h"

/* These constants are a bit silly because add_item() only knows about 
MAX_LIST */
#define MAX_DIR 10000
#define MAX_LINES 10000
#define MAX_LIST 10000

/* load a directory into a list of strings. Only filenames
   which match the passed function are loaded */
char **load_dir_list(char *name, int (*fn)(char *name))
{
      char **ret;
      int i=0;
      DIR *dir;
      struct dirent *d;
      ret = (char **)malloc(MAX_DIR*sizeof(ret[0]));
      if (!ret) return NULL;

      dir = opendir(name);
      if (!dir) {
            free(ret);
            return NULL;
      }

      while ((d = readdir(dir))) {
            char *dname = d_name(d);
            if (dname[0] == '.')
                  continue;
            if (fn && !fn(dname)) continue;
            ret[i] = strdup(dname);
            if (!ret[i]) {
                  fatal("strdup failed\n");
                  return NULL;
            }
            i++;
            if (i == MAX_DIR-1)
                  break;
      }
      ret[i] = NULL;

      closedir(dir);

      if (i > 1)
            qsort(ret, i, sizeof(ret[i]), namecmp);

      return ret;
}

/* load a file into a list of strings. Only strings
   which match the passed function are loaded */
char **load_file_list(char *name,int (*fn)(char *name))
{
      char **ret;
      int i=0;
      FILE *f;
      char buf[100];

      ret = (char **)malloc(MAX_LINES*sizeof(ret[0]));
      if (!ret) return NULL; /*should have proper fatal() for util.c*/

      f = fopen(name,"r");
      if (!f) return NULL; /*ditto fatal*/

      while (fgets(buf, sizeof(buf)-1, f)) {
            if (buf[strlen(buf)-1] == '\n')
                  buf[strlen(buf)-1] = 0;
            if (!*buf || !fn(buf)) continue;
            ret[i] = strdup(buf);
            if (!ret[i]) {
              fatal("strdup failed\n");
              return NULL;
            }
            i++;
      }
      fclose(f);

      ret[i] = NULL;

      if (i > 1)
            qsort(ret, i, sizeof(ret[i]), namecmp);

      return ret;
}

/* free a list load_dir_list, load_file_list or new_list has created. Relies 
on last member being NULL so use qsort elsewhere to avoid holes */
void free_list(char **list)
{
      int i;
      if (!list) return;
      for (i=0;list[i];i++)
            free(list[i]);
      free(list);
}

/* write a file with supplied mode from a list of strings. Only strings
   which match the passed function are written. Relies on last item==NULL 
   Deletes file if no entries in the list and mode is "w".
*/
int write_list(char *fname,char *mode,char **list,int (*fn)(char *name))
{
      int i;
      FILE *f;

      if (!list || !list[0]) return 0;

      for (i=0;list[i];i++);

      if (!mode || !*mode || !(f=fopen(fname,mode))) return 1;

      if (strcmp(mode,"w")==0 && i==0) {
              unlink(fname);
      } else {
              for (i=0;list[i];i++) {
                    if (!fn(list[i])) continue;
                  fprintf(f,"%s\n",list[i]);
            }
        }
      fclose(f);

      return 0;
}

void debug_print_list(char **list)
{
        int i;

        if (!list || !list[0]) {
              printf("debug_print_list: empty list\n");
              return;
      }

        for (i=0;list[i];i++);
      printf("debug_print_list: there are %d items\n",i);

      for (i=0;list[i];i++) {
                printf("%s<br>\n",list[i]);
      }
}


/* free first line containing item from null-terminated list of strings */
int delete_list_item(char **list,char *item)
{
        int i,j;
      
      if (!item || !*item) return 1;
      
      for (i=0; list[i]; i++) {
            if (strcmp(list[i],item)==0) {
                  free(list[i]);
                  for (j=i; list[j]; j++)
                        list[j] = list[j+1];
                  return 0;
            }
      }

      return 1;
}

/* create a new list */
char **new_list(void)
{
        char **ret;

        ret = (char **)malloc(MAX_LIST*sizeof(ret[0]));
        if (!ret) return NULL;
        ret[0] = NULL;
      return ret;
}

/* append an item to a null-terminated list of strings */
int add_list_item(char **list,char *item)
{
        int i;

      if (!item || !*item) return 1;

      if (!list) return 1; /*caller's responsibility to make **list's */

      for (i=0; list[i]; i++);
      if (i == MAX_LIST) return 1;

      if (!(list[i]=strdup(item))) {
              fatal("strdup failed\n");
            return 1;
      }

      if (i > 1)
            qsort(list, i, sizeof(list[i]), namecmp);
      list[i+1] = NULL;

      return 0;
}













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