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// -*- C++ -*-
/* Copyright (C) 1989, 1990, 1991, 1992, 2000, 2001
Free Software Foundation, Inc.
Written by James Clark (jjc@jclark.com)
This file is part of groff.
groff 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 2, or (at your option) any later
version.
groff 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 groff; see the file COPYING. If not, write to the Free Software
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "lib.h"
#include <stdlib.h>
#include <assert.h>
#include "searchpath.h"
#include "nonposix.h"
search_path::search_path(const char *envvar, const char *standard,
int add_home, int add_current)
{
char *home = 0;
if (add_home)
home = getenv("HOME");
char *e = 0;
if (envvar)
e = getenv(envvar);
dirs = new char[((e && *e) ? strlen(e) + 1 : 0)
+ (add_current ? 1 + 1 : 0)
+ ((home && *home) ? strlen(home) + 1 : 0)
+ ((standard && *standard) ? strlen(standard) : 0)
+ 1];
*dirs = '\0';
if (e && *e) {
strcat(dirs, e);
strcat(dirs, PATH_SEP);
}
if (add_current) {
strcat(dirs, ".");
strcat(dirs, PATH_SEP);
}
if (home && *home) {
strcat(dirs, home);
strcat(dirs, PATH_SEP);
}
if (standard && *standard)
strcat(dirs, standard);
init_len = strlen(dirs);
}
search_path::~search_path()
{
// dirs is always allocated
a_delete dirs;
}
void search_path::command_line_dir(const char *s)
{
char *old = dirs;
unsigned old_len = strlen(old);
unsigned slen = strlen(s);
dirs = new char[old_len + 1 + slen + 1];
memcpy(dirs, old, old_len - init_len);
char *p = dirs;
p += old_len - init_len;
if (init_len == 0)
*p++ = PATH_SEP[0];
memcpy(p, s, slen);
p += slen;
if (init_len > 0) {
*p++ = PATH_SEP[0];
memcpy(p, old + old_len - init_len, init_len);
p += init_len;
}
*p++ = '\0';
a_delete old;
}
FILE *search_path::open_file(const char *name, char **pathp)
{
assert(name != 0);
if (IS_ABSOLUTE(name) || *dirs == '\0') {
FILE *fp = fopen(name, "r");
if (fp) {
if (pathp)
*pathp = strsave(name);
return fp;
}
else
return 0;
}
unsigned namelen = strlen(name);
char *p = dirs;
for (;;) {
char *end = strchr(p, PATH_SEP[0]);
if (!end)
end = strchr(p, '\0');
int need_slash = end > p && strchr(DIR_SEPS, end[-1]) == 0;
char *path = new char[(end - p) + need_slash + namelen + 1];
memcpy(path, p, end - p);
if (need_slash)
path[end - p] = '/';
strcpy(path + (end - p) + need_slash, name);
#if 0
fprintf(stderr, "trying `%s'\n", path);
#endif
FILE *fp = fopen(path, "r");
if (fp) {
if (pathp)
*pathp = path;
else
a_delete path;
return fp;
}
a_delete path;
if (*end == '\0')
break;
p = end + 1;
}
return 0;
}
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