71 lines
1.4 KiB
C
71 lines
1.4 KiB
C
/* Copyright (c) 1984 AT&T */
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/* All Rights Reserved */
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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
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/* The copyright notice above does not evidence any */
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/* actual or intended publication of such source code. */
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#ident "$Revision: 1.6 $"
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#include <unistd.h>
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#include <errno.h>
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#include <malloc.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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extern int errno;
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/* copy str into data space -- caller should report errors. */
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char *
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strsave(str)
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register char *str;
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{
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register char *rval;
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rval = malloc(strlen(str) + 1);
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if (rval != 0)
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strcpy(rval, str);
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return(rval);
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}
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/* Determine if the effective user id has the appropriate permission
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on a file. Modeled after access(2).
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amode:
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00 just checks for file existence.
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04 checks read permission.
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02 checks write permission.
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01 checks execute/search permission.
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other bits are ignored quietly.
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*/
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int
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eaccess( path, amode )
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char *path;
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register int amode;
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{
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struct stat s;
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if( stat( path, &s ) == -1 )
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return -1;
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amode &= 07;
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if( !amode )
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return 0; /* file exists */
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if( (amode & s.st_mode) == amode )
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return 0; /* access permitted by "other" mode */
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amode <<= 3;
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if( getegid() == s.st_gid && (amode & s.st_mode) == amode )
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return 0; /* access permitted by group mode */
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amode <<= 3;
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if( geteuid() == s.st_uid && (amode & s.st_mode) == amode )
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return 0; /* access permitted by owner mode */
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errno = EACCES;
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return -1;
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}
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