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/*
* fhist - file history and comparison tools
* Copyright (C) 1998, 2002, 2008 Peter Miller
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include <ac/string.h>
#include <sub/basename.h>
#include <sub/private.h>
#include <trace.h>
#include <wstr_list.h>
static wstring_ty *
entryname(wstring_ty *s)
{
wchar_t *start;
wchar_t *finish;
wchar_t *cp;
wchar_t prev;
start = s->wstr_text;
finish = s->wstr_text;
prev = '/';
cp = s->wstr_text;
for (;;)
{
if (prev == '/')
{
if (*cp != '/' && *cp != 0)
start = cp;
}
else
{
if (*cp == '/' || *cp == 0)
finish = cp;
}
if (!*cp)
break;
prev = *cp++;
}
return wstr_n_from_wc(start, finish - start);
}
/*
* NAME
* sub_basename - the basename substitution
*
* SYNOPSIS
* wstring_ty *sub_basename(wstring_list_ty *arg);
*
* DESCRIPTION
* The sub_basename function implements the basename substitution.
* The basename substitution is replaced by the basename of
* the argument path, similar to the basename(1) command.
*
* ARGUMENTS
* arg - list of arguments, including the function name as [0]
*
* RETURNS
* a pointer to a string in dynamic memory;
* or NULL on error, setting suberr appropriately.
*/
wstring_ty *
sub_basename(sub_context_ty *scp, wstring_list_ty *arg)
{
wstring_ty *result;
wstring_ty *suffix;
wstring_ty *s1;
long len;
trace(("sub_basename()\n{\n"));
switch (arg->nitems)
{
default:
sub_context_error_set
(
scp,
i18n("requires one or two arguments")
);
result = 0;
break;
case 2:
result = entryname(arg->item[1]);
break;
case 3:
s1 = entryname(arg->item[1]);
suffix = arg->item[2];
len = (long)s1->wstr_length - (long)suffix->wstr_length;
if
(
len > 0
&&
!memcmp
(
s1->wstr_text + len,
suffix->wstr_text,
suffix->wstr_length * sizeof(wchar_t)
)
)
{
result = wstr_n_from_wc(s1->wstr_text, len);
wstr_free(s1);
}
else
result = s1;
break;
}
trace(("return %8.8lX;\n", (long)result));
trace(("}\n"));
return result;
}
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