Mercurial > hg > toybox
view toys/posix/ln.c @ 674:7e846e281e38
New build infrastructure to generate FLAG_ macros and TT alias, #define FOR_commandname before #including toys.h to trigger it. Rename DEFINE_GLOBALS() to just GLOBALS() (because I could never remember if it was DECLARE_GLOBALS). Convert existing commands to use new infrastructure, and replace optflag constants with FLAG_ macros where appropriate.
author | Rob Landley <rob@landley.net> |
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date | Mon, 08 Oct 2012 00:02:30 -0500 |
parents | 6df4ccc0acbe |
children | 786841fdb1e0 |
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/* vi: set sw=4 ts=4: * * ln.c - Create filesystem links * * Copyright 2012 Andre Renaud <andre@bluewatersys.com> * * See http://opengroup.org/onlinepubs/9699919799/utilities/ln.html USE_LN(NEWTOY(ln, "<1nfs", TOYFLAG_BIN)) config LN bool "ln" default y help usage: ln [-sf] [FROM...] TO Create a link between FROM and TO. With only one argument, create link in current directory. -s Create a symbolic link -f Force the creation of the link, even if TO already exists -n Symlink at destination treated as file */ #define FOR_ln #include "toys.h" void ln_main(void) { char *dest = toys.optargs[--toys.optc], *new; struct stat buf; int i; // With one argument, create link in current directory. if (!toys.optc) { toys.optc++; dest="."; } // Is destination a directory? if (((toys.optflags&FLAG_n) ? lstat : stat)(dest, &buf) || !S_ISDIR(buf.st_mode)) { if (toys.optc>1) error_exit("'%s' not a directory"); buf.st_mode = 0; } for (i=0; i<toys.optc; i++) { int rc; char *try = toys.optargs[i]; if (S_ISDIR(buf.st_mode)) { new = strrchr(try, '/'); if (!new) new = try; new = xmsprintf("%s/%s", dest, new); } else new = dest; /* Silently unlink the existing target. If it doesn't exist, * then we just move on */ if (toys.optflags & FLAG_f) unlink(new); rc = (toys.optflags & FLAG_s) ? symlink(try, new) : link(try, new); if (rc) perror_exit("cannot create %s link from '%s' to '%s'", (toys.optflags & FLAG_s) ? "symbolic" : "hard", try, new); if (new != dest) free(new); } }