64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <string.h>
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#include <stdio.h>
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#include <utmp.h>
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void pututline(struct utmp* utmp)
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{
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FILE* f;
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struct utmp u;
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long i;
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if (!(f = fopen(_PATH_UTMP, "w+")))
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return;
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while (fread(&u, sizeof(struct utmp), 1, f) == 1)
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{
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if (!strncmp(utmp->ut_line, u.ut_line, sizeof(u.ut_line) -1))
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{
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if ((i = ftell(f)) < 0)
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goto ret;
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if (fseek(f, i - sizeof(struct utmp), SEEK_SET) < 0)
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goto ret;
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fwrite(utmp, sizeof(struct utmp), 1, f);
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goto ret;
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}
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}
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fclose(f);
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if (!(f = fopen(_PATH_UTMP, "w+")))
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return;
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fwrite(utmp, sizeof(struct utmp), 1, f);
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ret:
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fclose(f);
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}
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