119 lines
2.9 KiB
C++
119 lines
2.9 KiB
C++
// -*- C++ -*-
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/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
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Written by James Clark (jjc@jclark.com)
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This file is part of groff.
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groff is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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groff is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License along
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with groff; see the file COPYING. If not, write to the Free Software
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Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <assert.h>
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#include "lib.h"
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#include "searchpath.h"
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#include "nonposix.h"
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search_path::search_path(const char *envvar, const char *standard)
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{
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char *e = envvar ? getenv(envvar) : 0;
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if (e && standard) {
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dirs = new char[strlen(e) + strlen(standard) + 2];
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strcpy(dirs, e);
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strcat(dirs, PATH_SEP);
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strcat(dirs, standard);
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}
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else
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dirs = strsave(e ? e : standard);
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init_len = dirs ? strlen(dirs) : 0;
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}
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search_path::~search_path()
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{
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if (dirs)
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a_delete dirs;
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}
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void search_path::command_line_dir(const char *s)
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{
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if (!dirs)
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dirs = strsave(s);
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else {
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char *old = dirs;
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unsigned old_len = strlen(old);
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unsigned slen = strlen(s);
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dirs = new char[old_len + 1 + slen + 1];
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memcpy(dirs, old, old_len - init_len);
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char *p = dirs;
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p += old_len - init_len;
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if (init_len == 0)
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*p++ = PATH_SEP[0];
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memcpy(p, s, slen);
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p += slen;
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if (init_len > 0) {
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*p++ = PATH_SEP[0];
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memcpy(p, old + old_len - init_len, init_len);
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p += init_len;
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}
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*p++ = '\0';
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a_delete old;
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}
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}
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FILE *search_path::open_file(const char *name, char **pathp)
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{
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assert(name != 0);
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if (IS_ABSOLUTE(name) || dirs == 0 || *dirs == '\0') {
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FILE *fp = fopen(name, "r");
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if (fp) {
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if (pathp)
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*pathp = strsave(name);
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return fp;
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}
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else
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return 0;
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}
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unsigned namelen = strlen(name);
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char *p = dirs;
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for (;;) {
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char *end = strchr(p, PATH_SEP[0]);
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if (!end)
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end = strchr(p, '\0');
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int need_slash = end > p && strchr(DIR_SEPS, end[-1]) == 0;
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char *path = new char[(end - p) + need_slash + namelen + 1];
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memcpy(path, p, end - p);
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if (need_slash)
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path[end - p] = '/';
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strcpy(path + (end - p) + need_slash, name);
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#if 0
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fprintf(stderr, "trying `%s'\n", path);
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#endif
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FILE *fp = fopen(path, "r");
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if (fp) {
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if (pathp)
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*pathp = path;
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else
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a_delete path;
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return fp;
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}
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a_delete path;
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if (*end == '\0')
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break;
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p = end + 1;
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}
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return 0;
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}
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