/*********************************************************************** * * * This software is part of the ast package * * Copyright (c) 1982-2007 AT&T Intellectual Property * * and is licensed under the * * Common Public License, Version 1.0 * * by AT&T Intellectual Property * * * * A copy of the License is available at * * http://www.opensource.org/licenses/cpl1.0.txt * * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * * * * Information and Software Systems Research * * AT&T Research * * Florham Park NJ * * * * Glenn Fowler <gsf@research.att.com> * * David Korn <dgk@research.att.com> * * * ***********************************************************************/ #pragma prototyped static const char usage[] = "[-?\n@(#)$Id: readlink (AT&T Research) 2008-06-08 $\n]" USAGE_LICENSE "[+NAME?readlink - read the contents of a symbolic link]" "[+DESCRIPTION?\breadlink\b returns the contents of the symbolic " "link referred to by the path argument. Unless the \b-f\b " "option is specified an error will be returned when the path " "is not a symbolic link.]" "[f:canonicalize?The returned value will be an absolute pathname that names " "the same file, whose resolution does not involve \".\", \"..\", or " "symbolic links, otherwise only the exact (relative) value will be returned.]" "[n:no-newline?Supress newline at the end.]" "[v:verbose?Verbose - print errors.]" "[+SEE ALSO?\bbasename\b(1),\bdirname\b(2),\breadlink\b(2),\breadpath\n(2)]" ; #include <cmd.h> int b_readlink(int argc, char** argv, void* context) { register char* s; register int i; register char* m; register char* x; int canonicalize = 0, nonewline = 0, verbose = 0; char buf[PATH_MAX+2]; int len = 0; char *filename, *resolvedname = NULL; cmdinit(argc, argv, context, ERROR_CATALOG, 0); for (;;) { switch (optget(argv, usage)) { case 'f': canonicalize = opt_info.num; continue; case 'n': nonewline = opt_info.num; continue; case 'v': verbose = opt_info.num; continue; case '?': error(ERROR_usage(2), "%s", opt_info.arg); continue; case ':': error(2, "%s", opt_info.arg); continue; } break; } argv += opt_info.index; argc -= opt_info.index; if(error_info.errors || argc != 1) error(ERROR_usage(2),"%s", optusage(NiL)); filename = argv[0]; if (canonicalize) { len = resolvepath(filename, buf, sizeof(buf)-2); } else { len = readlink(filename, buf, sizeof(buf)-2); } if (len != -1) resolvedname = buf; if (!resolvedname) { if (verbose) error(ERROR_system(1),"%s: readlink failed", filename); else return 1; } if (!nonewline) resolvedname[len++] = '\n'; sfwrite(sfstdout, resolvedname, len); return 0; }