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/* path-elt.c: Return the stuff between colons.
Copyright (C) 1993, 96 Karl Berry.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include <kpathsea/config.h>
#include <kpathsea/c-pathch.h>
#include <kpathsea/pathsearch.h>
/* The static (but dynamically allocated) area we return the answer in,
and how much we've currently allocated for it. */
static string elt = NULL;
static unsigned elt_alloc = 0;
/* The path we're currently working on. */
static const_string path = NULL;
/* Upon entry, the static `path' is at the first (and perhaps last)
character of the return value, or else NULL if we're at the end (or
haven't been called). I make no provision for caching the results;
thus, we parse the same path over and over, on every lookup. If that
turns out to be a significant lose, it can be fixed, but I'm guessing
disk accesses overwhelm everything else. If ENV_P is true, use
IS_ENV_SEP; else use IS_DIR_SEP. */
static string
element P2C(const_string, passed_path, boolean, env_p)
{
const_string p;
string ret;
int brace_level;
unsigned len;
if (passed_path)
path = passed_path;
/* Check if called with NULL, and no previous path (perhaps we reached
the end). */
else if (!path)
return NULL;
/* OK, we have a non-null `path' if we get here. */
assert (path);
p = path;
/* Find the next colon not enclosed by braces (or the end of the path). */
brace_level = 0;
while (*p != 0 && !(brace_level == 0
&& (env_p ? IS_ENV_SEP (*p) : IS_DIR_SEP (*p)))) {
if (*p == '{') ++brace_level;
else if (*p == '}') --brace_level;
++p;
}
/* Return the substring starting at `path'. */
len = p - path;
/* Make sure we have enough space (including the null byte). */
if (len + 1 > elt_alloc)
{
elt_alloc = len + 1;
elt = (string)xrealloc (elt, elt_alloc);
}
strncpy (elt, path, len);
elt[len] = 0;
ret = elt;
/* If we are at the end, return NULL next time. */
if (path[len] == 0)
path = NULL;
else
path += len + 1;
return ret;
}
string
kpse_path_element P1C(const_string, p)
{
return element (p, true);
}
string
kpse_filename_component P1C(const_string, p)
{
return element (p, false);
}
#ifdef TEST
void
print_path_elements (const_string path)
{
string elt;
printf ("Elements of `%s':", path ? path : "(null)");
for (elt = kpse_path_element (path); elt != NULL;
elt = kpse_path_element (NULL))
{
printf (" %s", *elt ? elt : "`'");
}
puts (".");
}
int
main ()
{
/* All lists end with NULL. */
print_path_elements (NULL); /* */
print_path_elements (""); /* "" */
print_path_elements ("a"); /* a */
print_path_elements (ENV_SEP_STRING); /* "", "" */
print_path_elements (ENV_SEP_STRING ENV_SEP_STRING); /* "", "", "" */
print_path_elements ("a" ENV_SEP_STRING); /* a, "" */
print_path_elements (ENV_SEP_STRING "b"); /* "", b */
print_path_elements ("a" ENV_SEP_STRING "b"); /* a, b */
return 0;
}
#endif /* TEST */
/*
Local variables:
standalone-compile-command: "gcc -g -I. -I.. -DTEST path-elt.c kpathsea.a"
End:
*/
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