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/* find-suffix.c: return the stuff after a dot.
Copyright 1992, 1993, 1995, 2008, 2011, 2016 Karl Berry.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this library; if not, see <http://www.gnu.org/licenses/>. */
#include <kpathsea/config.h>
#include <kpathsea/c-pathch.h>
/* Return pointer to first character after `.' in last directory element
of NAME. If the name is `foo' or `/foo.bar/baz', we have no extension. */
/* The the result of strrchr(NAME, '.'), when not NULL, is a non-const
pointer into the string NAME. However, this is cheating (motivated
by limitations of the C language) when the argument NAME is a
const string, because in that case the (technically non-const) result
from strrchr() is certainly not modifiable.
We do not want to repeat this kind of cheating for find_suffix() and
therefore declare find_suffix(NAME) as const. When find_suffix(NAME)
is non-NULL and the argument NAME is modifiable (i.e., non-const)
then NAME+(find_suffix(NAME)-NAME) is an equivalent modifiable string
and the pointer arithmetic is optimized away by modern compilers. */
const_string
find_suffix (const_string name)
{
const_string dot_pos = strrchr (name, '.');
const_string p;
if (dot_pos == NULL)
return NULL;
for (p = dot_pos + 1; *p; p++) {
if (IS_DIR_SEP (*p))
return NULL;
}
return dot_pos + 1;
}
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