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https://gitlab.com/sortix/sortix.git
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29555d72bb
POSIX allows <fcntl.h> to include <sys/stat.h>, but doesn't require it. There's little reason to do that, since they are separate headers, and <fcntl.h> just needs the mode_t constants. Fix the code accidentally relying on <fcntl.h> including <sys/stat.h>. The mode_t constants are now provided in their own kernel header <sortix/mode.h>. Additionally fix <sys/stat.h> pulling in all of <sys/types.h>, which is not allowed by POSIX, which only requires a few types to be declared. Fix the code accidentally relying on <sys/stat.h> including <sys/types.h>. Finally fix <dirent.h> pulling in <stdint.h> through <sortix/dirent.h>. The <sortix/__/dt.h> and <sortix/__/stat.h> headers are no longer required and their contents have been merged into <sortix/__/dirent.h>.
138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
/*
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* Copyright (c) 2013, 2018 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* ln.c
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* Create a hard or symbolic link.
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*/
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#include <sys/stat.h>
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#include <errno.h>
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#include <error.h>
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#include <libgen.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static void compact_arguments(int* argc, char*** argv)
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{
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for ( int i = 0; i < *argc; i++ )
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{
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while ( i < *argc && !(*argv)[i] )
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{
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for ( int n = i; n < *argc; n++ )
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(*argv)[n] = (*argv)[n+1];
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(*argc)--;
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}
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}
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}
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static void help(FILE* fp, const char* argv0)
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{
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fprintf(fp, "Usage: %s [OPTION]... TARGET LINK_NAME\n", argv0);
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fprintf(fp, "Create a hard or symbolic link.\n");
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}
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static void version(FILE* fp, const char* argv0)
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{
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fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
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}
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int main(int argc, char* argv[])
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{
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const char* argv0 = argv[0];
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bool force = false;
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bool symbolic = false;
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bool no_target_directory = false;
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bool verbose = false;
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for ( int i = 1; i < argc; i++ )
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{
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const char* arg = argv[i];
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if ( arg[0] != '-' || !arg[1] )
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continue;
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argv[i] = NULL;
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if ( !strcmp(arg, "--") )
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break;
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if ( arg[1] != '-' )
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{
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char c;
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while ( (c = *++arg) ) switch ( c )
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{
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case 'f': force = true; break;
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case 's': symbolic = true; break;
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case 'T': no_target_directory = true; break;
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case 'v': verbose = true; break;
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default:
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fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
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help(stderr, argv0);
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exit(1);
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}
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}
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else if ( !strcmp(arg, "--force") )
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force = true;
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else if ( !strcmp(arg, "--symbolic") )
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symbolic = true;
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else if ( !strcmp(arg, "--verbose") )
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verbose = true;
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else if ( !strcmp(arg, "--help") )
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help(stdout, argv0), exit(0);
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else if ( !strcmp(arg, "--version") )
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version(stdout, argv0), exit(0);
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else
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{
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fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
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help(stderr, argv0);
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exit(1);
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}
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}
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compact_arguments(&argc, &argv);
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if ( argc != 3 )
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error(1, 0, "%s operand", argc < 3 ? "missing" : "extra");
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const char* oldname = argv[1];
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const char* newname = argv[2];
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bool done = false;
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again:
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if ( force )
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unlink(newname);
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struct stat st;
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int ret = (symbolic ? symlink : link)(oldname, newname);
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if ( ret == 0 )
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{
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if ( verbose )
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printf("`%s' => `%s'\n", newname, oldname);
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}
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else if ( !done && errno == EEXIST && !no_target_directory &&
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lstat(newname, &st) == 0 && S_ISDIR(st.st_mode) )
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{
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char* oldnamecopy = strdup(oldname);
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const char* name = basename(oldnamecopy);
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char* newnewname;
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asprintf(&newnewname, "%s/%s", newname, name);
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free(oldnamecopy);
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newname = newnewname;
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done = true;
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goto again;
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}
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else
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error(0, errno, "`%s' => `%s'", newname, oldname);
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return ret ? 1 : 0;
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}
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