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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *  * Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  *  * Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in
     12  *    the documentation and/or other materials provided with the
     13  *    distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     16  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     17  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     18  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
     19  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
     22  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     25  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 #include <string.h>
     29 #include <stdio.h>
     30 #include <utmp.h>
     31 
     32 
     33 void pututline(struct utmp* utmp)
     34 {
     35     FILE* f;
     36     struct utmp u;
     37     long i;
     38 
     39     if (!(f = fopen(_PATH_UTMP, "w+")))
     40         return;
     41 
     42     while (fread(&u, sizeof(struct utmp), 1, f) == 1)
     43     {
     44         if (!strncmp(utmp->ut_line, u.ut_line, sizeof(u.ut_line) -1))
     45         {
     46             if ((i = ftell(f)) < 0)
     47                 goto ret;
     48             if (fseek(f, i - sizeof(struct utmp), SEEK_SET) < 0)
     49                 goto ret;
     50             fwrite(utmp, sizeof(struct utmp), 1, f);
     51             goto ret;
     52         }
     53     }
     54 
     55 
     56     fclose(f);
     57 
     58     if (!(f = fopen(_PATH_UTMP, "w+")))
     59         return;
     60     fwrite(utmp, sizeof(struct utmp), 1, f);
     61 
     62 ret:
     63     fclose(f);
     64 }
     65