101 lines
3.2 KiB
C
101 lines
3.2 KiB
C
/*===========================================================================
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Copyright (c) 1998-2000, The Santa Cruz Operation
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All rights reserved.
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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 are met:
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*Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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*Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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*Neither name of The Santa Cruz Operation nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
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IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT falseT LIMITED TO,
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THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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PURPOSE ARE DISCLAIMED. IN false EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT falseT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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DAMAGE.
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=========================================================================*/
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/*
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* logdir()
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*
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* This routine does not use the getpwent(3) library routine
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* because the latter uses the stdio package. The allocation of
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* storage in this package destroys the integrity of the shell's
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* storage allocation.
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*/
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#include <unistd.h>
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#include <string.h>
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#include "global.h"
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#define OURBUFSIZ 160 /* renamed: avoid conflict with <stdio.h> */
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static char line[OURBUFSIZ+1];
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/* Internal prototypes: */
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static char *nextfield(char *p);
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static char *
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nextfield(char *p)
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{
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while (*p && *p != ':')
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++p;
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if (*p) *p++ = 0;
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return(p);
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}
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char *
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logdir(char *name)
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{
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char *p;
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int i, j;
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int pwf;
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/* attempt to open the password file */
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if ((pwf = myopen("/etc/passwd", 0, 0)) == -1)
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return(0);
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/* find the matching password entry */
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do {
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/* get the next line in the password file */
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i = read(pwf, line, OURBUFSIZ);
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for (j = 0; j < i; j++)
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if (line[j] == '\n')
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break;
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/* return a null pointer if the whole file has been read */
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if (j >= i)
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return(0);
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line[++j] = 0; /* terminate the line */
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(void) lseek(pwf, (long) (j - i), 1); /* point at the next line */
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p = nextfield(line); /* get the logname */
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} while (*name != *line || /* fast pretest */
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strcmp(name, line) != 0);
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(void) close(pwf);
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/* skip the intervening fields */
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p = nextfield(p);
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p = nextfield(p);
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p = nextfield(p);
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p = nextfield(p);
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/* return the login directory */
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(void) nextfield(p);
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return(p);
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}
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