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Cider Isn't Darwin Emulation, Really
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C
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266/*- * Copyright (c) 1987, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */
#if 0#ifndef lintstatic char const copyright[] ="@(#) Copyright (c) 1987, 1993, 1994\n\ The Regents of the University of California. All rights reserved.\n";#endif /* not lint */
#ifndef lintstatic char sccsid[] = "@(#)ln.c 8.2 (Berkeley) 3/31/94";#endif /* not lint */#endif#include <sys/cdefs.h>//__FBSDID("$FreeBSD: src/bin/ln/ln.c,v 1.34 2006/02/14 11:08:05 glebius Exp $");
#include <bsd/string.h>
#include <sys/param.h>#include <sys/stat.h>
#include <err.h>#include <errno.h>#include <libgen.h>#include <limits.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>
int fflag; /* Unlink existing files. */int Fflag; /* Remove empty directories also. */int hflag; /* Check new name for symlink first. */int iflag; /* Interactive mode. */int sflag; /* Symbolic, not hard, link. */int vflag; /* Verbose output. */ /* System link call. */int (*linkf)(const char *, const char *);char linkch;
int linkit(const char *, const char *, int);void usage(void);
intmain(int argc, char *argv[]){ struct stat sb; char *p, *sourcedir; int ch, exitval;
if (argc < 1) usage(); /* * Test for the special case where the utility is called as * "link", for which the functionality provided is greatly * simplified. */ if ((p = rindex(argv[0], '/')) == NULL) p = argv[0]; else ++p; if (strcmp(p, "link") == 0) { while (getopt(argc, argv, "") != -1) usage(); argc -= optind; argv += optind; if (argc != 2) usage(); linkf = link; exit(linkit(argv[0], argv[1], 0)); }
while ((ch = getopt(argc, argv, "Ffhinsv")) != -1) switch (ch) { case 'F': Fflag = 1; break; case 'f': fflag = 1; iflag = 0; break; case 'h': case 'n': hflag = 1; break; case 'i': iflag = 1; fflag = 0; break; case 's': sflag = 1; break; case 'v': vflag = 1; break; case '?': default: usage(); }
argv += optind; argc -= optind;
linkf = sflag ? symlink : link; linkch = sflag ? '-' : '='; if (sflag == 0) Fflag = 0; if (Fflag == 1 && iflag == 0) fflag = 1;
switch(argc) { case 0: usage(); /* NOTREACHED */ case 1: /* ln target */ exit(linkit(argv[0], ".", 1)); case 2: /* ln target source */ exit(linkit(argv[0], argv[1], 0)); default: ; } /* ln target1 target2 directory */ sourcedir = argv[argc - 1]; if (hflag && lstat(sourcedir, &sb) == 0 && S_ISLNK(sb.st_mode)) { /* * We were asked not to follow symlinks, but found one at * the target--simulate "not a directory" error */ errno = ENOTDIR; err(1, "%s", sourcedir); } if (stat(sourcedir, &sb)) err(1, "%s", sourcedir); if (!S_ISDIR(sb.st_mode)) usage(); for (exitval = 0; *argv != sourcedir; ++argv) exitval |= linkit(*argv, sourcedir, 1); exit(exitval);}
intlinkit(const char *target, const char *source, int isdir){ struct stat sb; const char *p; int ch, exists, first; char path[PATH_MAX]; char bbuf[PATH_MAX];
if (!sflag) { /* If target doesn't exist, quit now. */ if (stat(target, &sb)) { warn("%s", target); return (1); } /* Only symbolic links to directories. */ if (S_ISDIR(sb.st_mode)) { errno = EISDIR; warn("%s", target); return (1); } }
/* * If the source is a directory (and not a symlink if hflag), * append the target's name. */ if (isdir || (lstat(source, &sb) == 0 && S_ISDIR(sb.st_mode)) || (!hflag && stat(source, &sb) == 0 && S_ISDIR(sb.st_mode))) { if (strlcpy(bbuf, target, sizeof(bbuf)) >= sizeof(bbuf) || (p = basename(bbuf)) == NULL || snprintf(path, sizeof(path), "%s/%s", source, p) >= (ssize_t)sizeof(path)) { errno = ENAMETOOLONG; warn("%s", target); return (1); } source = path; }
exists = !lstat(source, &sb); /* * If the file exists, then unlink it forcibly if -f was specified * and interactively if -i was specified. */ if (fflag && exists) { if (Fflag && S_ISDIR(sb.st_mode)) { if (rmdir(source)) { warn("%s", source); return (1); } } else if (unlink(source)) { warn("%s", source); return (1); } } else if (iflag && exists) { fflush(stdout); fprintf(stderr, "replace %s? ", source);
first = ch = getchar(); while(ch != '\n' && ch != EOF) ch = getchar(); if (first != 'y' && first != 'Y') { fprintf(stderr, "not replaced\n"); return (1); }
if (Fflag && S_ISDIR(sb.st_mode)) { if (rmdir(source)) { warn("%s", source); return (1); } } else if (unlink(source)) { warn("%s", source); return (1); } }
/* Attempt the link. */ if ((*linkf)(target, source)) { warn("%s", source); return (1); } if (vflag) (void)printf("%s %c> %s\n", source, linkch, target); return (0);}
voidusage(void){ (void)fprintf(stderr, "%s\n%s\n%s\n", "usage: ln [-Ffhinsv] source_file [target_file]", " ln [-Ffhinsv] source_file ... target_dir", " link source_file target_file"); exit(1);}