source: vendor/current/source3/lib/substitute_generic.c

/*
   Unix SMB/CIFS implementation.
   Samba utility functions

   Copyright (C) Andrew Tridgell 1992-2001
   Copyright (C) Simo Sorce      2001-2002
   Copyright (C) Martin Pool     2003
   Copyright (C) James Peach     2006
   Copyright (C) Jeremy Allison  1992-2007

   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"

void fstring_sub(char *s,const char *pattern,const char *insert)
{
        string_sub(s, pattern, insert, sizeof(fstring));
}

/**
 Similar to string_sub2, but it will accept only allocated strings
 and may realloc them so pay attention at what you pass on no
 pointers inside strings, no const may be passed
 as string.
**/

char *realloc_string_sub2(char *string,
                        const char *pattern,
                        const char *insert,
                        bool remove_unsafe_characters,
                        bool allow_trailing_dollar)
{
        char *p, *in;
        char *s;
        ssize_t ls,lp,li,ld, i;

        if (!insert || !pattern || !*pattern || !string || !*string)
                return NULL;

        s = string;

        in = talloc_strdup(talloc_tos(), insert);
        if (!in) {
                DEBUG(0, ("realloc_string_sub: out of memory!\n"));
                return NULL;
        }
        ls = (ssize_t)strlen(s);
        lp = (ssize_t)strlen(pattern);
        li = (ssize_t)strlen(insert);
        ld = li - lp;
        for (i=0;i<li;i++) {
                switch (in[i]) {
                        case '$':
                                /* allow a trailing $
                                 * (as in machine accounts) */
                                if (allow_trailing_dollar && (i == li - 1 )) {
                                        break;
                                }
                        case '`':
                        case '"':
                        case '\'':
                        case ';':
                        case '%':
                        case '\r':
                        case '\n':
                                if ( remove_unsafe_characters ) {
                                        in[i] = '_';
                                        break;
                                }
                        default:
                                /* ok */
                                break;
                }
        }

        while ((p = strstr_m(s,pattern))) {
                if (ld > 0) {
                        int offset = PTR_DIFF(s,string);
                        string = talloc_realloc(NULL, string, char, ls + ld + 1);
                        if (!string) {
                                DEBUG(0, ("realloc_string_sub: "
                                        "out of memory!\n"));
                                talloc_free(in);
                                return NULL;
                        }
                        p = string + offset + (p - s);
                }
                if (li != lp) {
                        memmove(p+li,p+lp,strlen(p+lp)+1);
                }
                memcpy(p, in, li);
                s = p + li;
                ls += ld;
        }
        talloc_free(in);
        return string;
}

char *realloc_string_sub(char *string,
                        const char *pattern,
                        const char *insert)
{
        return realloc_string_sub2(string, pattern, insert, true, false);
}