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40b1724f58
Instead of happily ignoring return codes. Calls that allocate data, like duplicating strings, can fail because of lack of memory which could then leave the option unset and curl would unknowingly continue (if the memory shortage was momentary). Closes #19385
152 lines
4.2 KiB
C
152 lines
4.2 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "tool_setup.h"
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#ifdef HAVE_PWD_H
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#ifdef __AMIGA__
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#undef __NO_NET_API /* required for AmigaOS to declare getpwuid() */
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#endif
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#include <pwd.h>
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#ifdef __AMIGA__
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#define __NO_NET_API
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#endif
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#endif
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#include "tool_findfile.h"
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#include "tool_cfgable.h"
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#include "memdebug.h" /* keep this as LAST include */
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struct finder {
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const char *env;
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const char *append;
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bool withoutdot;
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};
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/* The order of the variables below is important, as the index number is used
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in the findfile() function */
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static const struct finder conf_list[] = {
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{ "CURL_HOME", NULL, FALSE },
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{ "XDG_CONFIG_HOME", NULL, TRUE },
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{ "HOME", NULL, FALSE },
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#ifdef _WIN32
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{ "USERPROFILE", NULL, FALSE },
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{ "APPDATA", NULL, FALSE },
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{ "USERPROFILE", "\\Application Data", FALSE},
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#endif
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/* these are for .curlrc if XDG_CONFIG_HOME is not defined */
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{ "CURL_HOME", "/.config", TRUE },
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{ "HOME", "/.config", TRUE },
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{ NULL, NULL, FALSE }
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};
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static char *checkhome(const char *home, const char *fname, bool dotscore)
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{
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const char pref[2] = { '.', '_' };
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int i;
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for(i = 0; i < (dotscore ? 2 : 1); i++) {
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char *c;
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if(dotscore)
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c = curl_maprintf("%s" DIR_CHAR "%c%s", home, pref[i], &fname[1]);
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else
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c = curl_maprintf("%s" DIR_CHAR "%s", home, fname);
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if(c) {
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int fd = curlx_open(c, O_RDONLY);
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if(fd >= 0) {
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char *path = strdup(c);
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close(fd);
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curl_free(c);
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return path;
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}
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curl_free(c);
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}
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}
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return NULL;
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}
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/*
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* findfile() - returns the full path name of the file. It must be freed with
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* curl_free().
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*
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* If 'dotscore' is TRUE, then check for the file first with a leading dot
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* and then with a leading underscore.
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*
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* 1. Iterate over the environment variables in order, and if set, check for
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* the given file to be accessed there, then it is a match.
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* 2. Non-Windows: try getpwuid
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*/
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char *findfile(const char *fname, int dotscore)
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{
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int i;
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DEBUGASSERT(fname && fname[0]);
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DEBUGASSERT((dotscore != 1) || (fname[0] == '.'));
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if(!fname[0])
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return NULL;
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for(i = 0; conf_list[i].env; i++) {
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char *home = curl_getenv(conf_list[i].env);
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if(home) {
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char *path;
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const char *filename = fname;
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if(!home[0]) {
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curl_free(home);
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continue;
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}
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if(conf_list[i].append) {
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char *c = curl_maprintf("%s%s", home, conf_list[i].append);
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curl_free(home);
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if(!c)
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return NULL;
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home = c;
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}
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if(conf_list[i].withoutdot) {
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if(!dotscore) {
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/* this is not looking for .curlrc, or the XDG_CONFIG_HOME was
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defined so we skip the extended check */
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curl_free(home);
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continue;
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}
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filename++; /* move past the leading dot */
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dotscore = 0; /* disable it for this check */
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}
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path = checkhome(home, filename, dotscore ? dotscore - 1 : 0);
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curl_free(home);
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if(path)
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return path;
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}
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}
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#if defined(HAVE_GETPWUID) && defined(HAVE_GETEUID)
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{
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struct passwd *pw = getpwuid(geteuid());
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if(pw) {
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char *home = pw->pw_dir;
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if(home && home[0])
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return checkhome(home, fname, FALSE);
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}
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}
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#endif /* PWD-stuff */
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return NULL;
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}
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