brlock_tdb.c: Fix typo in comment.

[Samba/gbeck.git] / lib / util / util_strlist.c

/* 
   Unix SMB/CIFS implementation.
   
   Copyright (C) Andrew Tridgell 2005
   Copyright (C) Jelmer Vernooij 2005
   
   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/>.
*/

#include "includes.h"
#include "system/locale.h"
#include "lib/util/tsort.h"

#undef strcasecmp

/**
 * @file
 * @brief String list manipulation
 */

/**
  build an empty (only NULL terminated) list of strings (for expansion with str_list_add() etc)
*/
_PUBLIC_ char **str_list_make_empty(TALLOC_CTX *mem_ctx)
{
        char **ret = NULL;

        ret = talloc_array(mem_ctx, char *, 1);
        if (ret == NULL) {
                return NULL;
        }

        ret[0] = NULL;

        return ret;
}

/**
  place the only element 'entry' into a new, NULL terminated string list
*/
_PUBLIC_ char **str_list_make_single(TALLOC_CTX *mem_ctx, const char *entry)
{
        char **ret = NULL;

        ret = talloc_array(mem_ctx, char *, 2);
        if (ret == NULL) {
                return NULL;
        }

        ret[0] = talloc_strdup(ret, entry);
        if (!ret[0]) {
                talloc_free(ret);
                return NULL;
        }
        ret[1] = NULL;

        return ret;
}

/**
  build a null terminated list of strings from a input string and a
  separator list. The separator list must contain characters less than
  or equal to 0x2f for this to work correctly on multi-byte strings
*/
_PUBLIC_ char **str_list_make(TALLOC_CTX *mem_ctx, const char *string, const char *sep)
{
        int num_elements = 0;
        char **ret = NULL;

        if (sep == NULL) {
                sep = LIST_SEP;
        }

        ret = talloc_array(mem_ctx, char *, 1);
        if (ret == NULL) {
                return NULL;
        }

        while (string && *string) {
                size_t len = strcspn(string, sep);
                char **ret2;
                
                if (len == 0) {
                        string += strspn(string, sep);
                        continue;
                }

                ret2 = talloc_realloc(mem_ctx, ret, char *,
                        num_elements+2);
                if (ret2 == NULL) {
                        talloc_free(ret);
                        return NULL;
                }
                ret = ret2;

                ret[num_elements] = talloc_strndup(ret, string, len);
                if (ret[num_elements] == NULL) {
                        talloc_free(ret);
                        return NULL;
                }

                num_elements++;
                string += len;
        }

        ret[num_elements] = NULL;

        return ret;
}

/**
 * build a null terminated list of strings from an argv-like input string 
 * Entries are separated by spaces and can be enclosed by quotes.
 * Does NOT support escaping
 */
_PUBLIC_ char **str_list_make_shell(TALLOC_CTX *mem_ctx, const char *string, const char *sep)
{
        int num_elements = 0;
        char **ret = NULL;

        ret = talloc_array(mem_ctx, char *, 1);
        if (ret == NULL) {
                return NULL;
        }

        if (sep == NULL)
                sep = " \t\n\r";

        while (string && *string) {
                size_t len = strcspn(string, sep);
                char *element;
                char **ret2;
                
                if (len == 0) {
                        string += strspn(string, sep);
                        continue;
                }

                if (*string == '\"') {
                        string++;
                        len = strcspn(string, "\"");
                        element = talloc_strndup(ret, string, len);
                        string += len + 1;
                } else {
                        element = talloc_strndup(ret, string, len);
                        string += len;
                }

                if (element == NULL) {
                        talloc_free(ret);
                        return NULL;
                }

                ret2 = talloc_realloc(mem_ctx, ret, char *, num_elements+2);
                if (ret2 == NULL) {
                        talloc_free(ret);
                        return NULL;
                }
                ret = ret2;

                ret[num_elements] = element;    

                num_elements++;
        }

        ret[num_elements] = NULL;

        return ret;

}

/**
 * join a list back to one string 
 */
_PUBLIC_ char *str_list_join(TALLOC_CTX *mem_ctx, const char **list, char separator)
{
        char *ret = NULL;
        int i;
        
        if (list[0] == NULL)
                return talloc_strdup(mem_ctx, "");

        ret = talloc_strdup(mem_ctx, list[0]);

        for (i = 1; list[i]; i++) {
                ret = talloc_asprintf_append_buffer(ret, "%c%s", separator, list[i]);
        }

        return ret;
}

/** join a list back to one (shell-like) string; entries 
 * separated by spaces, using quotes where necessary */
_PUBLIC_ char *str_list_join_shell(TALLOC_CTX *mem_ctx, const char **list, char sep)
{
        char *ret = NULL;
        int i;
        
        if (list[0] == NULL)
                return talloc_strdup(mem_ctx, "");

        if (strchr(list[0], ' ') || strlen(list[0]) == 0) 
                ret = talloc_asprintf(mem_ctx, "\"%s\"", list[0]);
        else 
                ret = talloc_strdup(mem_ctx, list[0]);

        for (i = 1; list[i]; i++) {
                if (strchr(list[i], ' ') || strlen(list[i]) == 0) 
                        ret = talloc_asprintf_append_buffer(ret, "%c\"%s\"", sep, list[i]);
                else 
                        ret = talloc_asprintf_append_buffer(ret, "%c%s", sep, list[i]);
        }

        return ret;
}

/**
  return the number of elements in a string list
*/
_PUBLIC_ size_t str_list_length(const char * const *list)
{
        size_t ret;
        for (ret=0;list && list[ret];ret++) /* noop */ ;
        return ret;
}


/**
  copy a string list
*/
_PUBLIC_ char **str_list_copy(TALLOC_CTX *mem_ctx, const char **list)
{
        int i;
        char **ret;

        if (list == NULL)
                return NULL;
        
        ret = talloc_array(mem_ctx, char *, str_list_length(list)+1);
        if (ret == NULL) 
                return NULL;

        for (i=0;list && list[i];i++) {
                ret[i] = talloc_strdup(ret, list[i]);
                if (ret[i] == NULL) {
                        talloc_free(ret);
                        return NULL;
                }
        }
        ret[i] = NULL;
        return ret;
}

/**
   Return true if all the elements of the list match exactly.
 */
_PUBLIC_ bool str_list_equal(const char * const *list1,
                             const char * const *list2)
{
        int i;
        
        if (list1 == NULL || list2 == NULL) {
                return (list1 == list2); 
        }
        
        for (i=0;list1[i] && list2[i];i++) {
                if (strcmp(list1[i], list2[i]) != 0) {
                        return false;
                }
        }
        if (list1[i] || list2[i]) {
                return false;
        }
        return true;
}


/**
  add an entry to a string list
*/
_PUBLIC_ const char **str_list_add(const char **list, const char *s)
{
        size_t len = str_list_length(list);
        const char **ret;

        ret = talloc_realloc(NULL, list, const char *, len+2);
        if (ret == NULL) return NULL;

        ret[len] = talloc_strdup(ret, s);
        if (ret[len] == NULL) return NULL;

        ret[len+1] = NULL;

        return ret;
}

/**
  remove an entry from a string list
*/
_PUBLIC_ void str_list_remove(const char **list, const char *s)
{
        int i;

        for (i=0;list[i];i++) {
                if (strcmp(list[i], s) == 0) break;
        }
        if (!list[i]) return;

        for (;list[i];i++) {
                list[i] = list[i+1];
        }
}


/**
  return true if a string is in a list
*/
_PUBLIC_ bool str_list_check(const char **list, const char *s)
{
        int i;

        for (i=0;list[i];i++) {
                if (strcmp(list[i], s) == 0) return true;
        }
        return false;
}

/**
  return true if a string is in a list, case insensitively
*/
_PUBLIC_ bool str_list_check_ci(const char **list, const char *s)
{
        int i;

        for (i=0;list[i];i++) {
                if (strcasecmp(list[i], s) == 0) return true;
        }
        return false;
}


/**
  append one list to another - expanding list1
*/
_PUBLIC_ const char **str_list_append(const char **list1,
        const char * const *list2)
{
        size_t len1 = str_list_length(list1);
        size_t len2 = str_list_length(list2);
        const char **ret;
        int i;

        ret = talloc_realloc(NULL, list1, const char *, len1+len2+1);
        if (ret == NULL) return NULL;

        for (i=len1;i<len1+len2;i++) {
                ret[i] = talloc_strdup(ret, list2[i-len1]);
                if (ret[i] == NULL) {
                        return NULL;
                }
        }
        ret[i] = NULL;

        return ret;
}

static int list_cmp(const char **el1, const char **el2)
{
        return strcmp(*el1, *el2);
}

/*
  return a list that only contains the unique elements of a list,
  removing any duplicates
 */
_PUBLIC_ const char **str_list_unique(const char **list)
{
        size_t len = str_list_length(list);
        const char **list2;
        int i, j;
        if (len < 2) {
                return list;
        }
        list2 = (const char **)talloc_memdup(list, list,
                                             sizeof(list[0])*(len+1));
        TYPESAFE_QSORT(list2, len, list_cmp);
        list[0] = list2[0];
        for (i=j=1;i<len;i++) {
                if (strcmp(list2[i], list[j-1]) != 0) {
                        list[j] = list2[i];
                        j++;
                }
        }
        list[j] = NULL;
        list = talloc_realloc(NULL, list, const char *, j + 1);
        talloc_free(list2);
        return list;
}

/*
  very useful when debugging complex list related code
 */
_PUBLIC_ void str_list_show(const char **list)
{
        int i;
        DEBUG(0,("{ "));
        for (i=0;list && list[i];i++) {
                DEBUG(0,("\"%s\", ", list[i]));
        }
        DEBUG(0,("}\n"));
}



/**
  append one list to another - expanding list1
  this assumes the elements of list2 are const pointers, so we can re-use them
*/
_PUBLIC_ const char **str_list_append_const(const char **list1,
                                            const char **list2)
{
        size_t len1 = str_list_length(list1);
        size_t len2 = str_list_length(list2);
        const char **ret;
        int i;

        ret = talloc_realloc(NULL, list1, const char *, len1+len2+1);
        if (ret == NULL) return NULL;

        for (i=len1;i<len1+len2;i++) {
                ret[i] = list2[i-len1];
        }
        ret[i] = NULL;

        return ret;
}

/**
 * Add a string to an array of strings.
 *
 * num should be a pointer to an integer that holds the current
 * number of elements in strings. It will be updated by this function.
 */
_PUBLIC_ bool add_string_to_array(TALLOC_CTX *mem_ctx,
                         const char *str, const char ***strings, int *num)
{
        char *dup_str = talloc_strdup(mem_ctx, str);

        *strings = talloc_realloc(mem_ctx,
                                    *strings,
                                    const char *, ((*num)+1));

        if ((*strings == NULL) || (dup_str == NULL)) {
                *num = 0;
                return false;
        }

        (*strings)[*num] = dup_str;
        *num += 1;

        return true;
}

/**
  add an entry to a string list
  this assumes s will not change
*/
_PUBLIC_ const char **str_list_add_const(const char **list, const char *s)
{
        size_t len = str_list_length(list);
        const char **ret;

        ret = talloc_realloc(NULL, list, const char *, len+2);
        if (ret == NULL) return NULL;

        ret[len] = s;
        ret[len+1] = NULL;

        return ret;
}

/**
  copy a string list
  this assumes list will not change
*/
_PUBLIC_ const char **str_list_copy_const(TALLOC_CTX *mem_ctx,
                                          const char **list)
{
        int i;
        const char **ret;

        if (list == NULL)
                return NULL;
        
        ret = talloc_array(mem_ctx, const char *, str_list_length(list)+1);
        if (ret == NULL) 
                return NULL;

        for (i=0;list && list[i];i++) {
                ret[i] = list[i];
        }
        ret[i] = NULL;
        return ret;
}

/**
 * Needed for making an "unconst" list "const"
 */
_PUBLIC_ const char **const_str_list(char **list)
{
        return (const char **)list;
}