1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1992-2007 AT&T Knowledge Ventures * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Knowledge Ventures * 8 * * 9 * A copy of the License is available at * 10 * http://www.opensource.org/licenses/cpl1.0.txt * 11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12 * * 13 * Information and Software Systems Research * 14 * AT&T Research * 15 * Florham Park NJ * 16 * * 17 * Glenn Fowler <gsf@research.att.com> * 18 * David Korn <dgk@research.att.com> * 19 * * 20 ***********************************************************************/ 21 #pragma prototyped 22 /* 23 * David Korn 24 * AT&T Research 25 * 26 * logname 27 */ 28 29 static const char usage[] = 30 "[-?\n@(#)$Id: logname (AT&T Research) 1999-04-30 $\n]" 31 USAGE_LICENSE 32 "[+NAME?logname - return the user's login name]" 33 "[+DESCRIPTION?\blogname\b writes the users's login name to standard " 34 "output. The login name is the string that is returned by the " 35 "\bgetlogin\b(2) function. If \bgetlogin\b(2) does not return " 36 "successfully, the corresponding to the real user id of the calling " 37 "process is used instead.]" 38 39 "\n" 40 "\n\n" 41 "\n" 42 "[+EXIT STATUS?]{" 43 "[+0?Successful Completion.]" 44 "[+>0?An error occurred.]" 45 "}" 46 "[+SEE ALSO?\bgetlogin\b(2)]" 47 ; 48 49 50 #include <cmd.h> 51 52 int 53 b_logname(int argc, char** argv, void* context) 54 { 55 register char* logname; 56 57 cmdinit(argc, argv, context, ERROR_CATALOG, 0); 58 for (;;) 59 { 60 switch (optget(argv, usage)) 61 { 62 case ':': 63 error(2, "%s", opt_info.arg); 64 continue; 65 case '?': 66 error(ERROR_usage(2), "%s", opt_info.arg); 67 continue; 68 } 69 break; 70 } 71 if (error_info.errors) 72 error(ERROR_usage(2), "%s", optusage(NiL)); 73 if (!(logname = getlogin())) 74 logname = fmtuid(getuid()); 75 sfputr(sfstdout, logname, '\n'); 76 return 0; 77 } 78 79