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Add ln(1) target directory support.

This commit is contained in:
Jonas 'Sortie' Termansen 2015-10-04 18:59:10 +02:00
parent 63d42cd686
commit 4333b2e695
1 changed files with 18 additions and 0 deletions
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18
utils/ln.cpp
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@ -23,6 +23,7 @@
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <libgen.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@ -60,6 +61,7 @@ int main(int argc, char* argv[])
const char* argv0 = argv[0];
bool force = false;
bool symbolic = false;
bool no_target_directory = false;
bool verbose = false;
for ( int i = 1; i < argc; i++ )
{
@ -75,6 +77,7 @@ int main(int argc, char* argv[])
{
case 'f': force = true; break;
case 's': symbolic = true; break;
case 'T': no_target_directory = true; break;
case 'v': verbose = true; break;
default:
fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
@ -108,15 +111,30 @@ int main(int argc, char* argv[])
const char* oldname = argv[1];
const char* newname = argv[2];
bool done = false;
again:
if ( force )
unlink(newname);
struct stat st;
int ret = (symbolic ? symlink : link)(oldname, newname);
if ( ret == 0 )
{
if ( verbose )
printf("`%s' => `%s'\n", newname, oldname);
}
else if ( !done && errno == EEXIST && !no_target_directory &&
lstat(newname, &st) == 0 && S_ISDIR(st.st_mode) )
{
char* oldnamecopy = strdup(oldname);
const char* name = basename(oldnamecopy);
char* newnewname;
asprintf(&newnewname, "%s/%s", newname, name);
free(oldnamecopy);
newname = newnewname;
done = true;
goto again;
}
else
error(0, errno, "`%s' => `%s'", newname, oldname);
return ret ? 1 : 0;