quickjs-tart

quickjs-based runtime for wallet-core logic
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tool_findfile.c (4233B)

      1 /***************************************************************************
      2  *                                  _   _ ____  _
      3  *  Project                     ___| | | |  _ \| |
      4  *                             / __| | | | |_) | |
      5  *                            | (__| |_| |  _ <| |___
      6  *                             \___|\___/|_| \_\_____|
      7  *
      8  * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
      9  *
     10  * This software is licensed as described in the file COPYING, which
     11  * you should have received as part of this distribution. The terms
     12  * are also available at https://curl.se/docs/copyright.html.
     13  *
     14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
     15  * copies of the Software, and permit persons to whom the Software is
     16  * furnished to do so, under the terms of the COPYING file.
     17  *
     18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
     19  * KIND, either express or implied.
     20  *
     21  * SPDX-License-Identifier: curl
     22  *
     23  ***************************************************************************/
     24 #include "tool_setup.h"
     25 
     26 #ifdef HAVE_PWD_H
     27 #undef __NO_NET_API /* required for AmigaOS to declare getpwuid() */
     28 #include <pwd.h>
     29 #define __NO_NET_API
     30 #endif
     31 
     32 #ifdef HAVE_FCNTL_H
     33 #include <fcntl.h>
     34 #endif
     35 
     36 #include "tool_findfile.h"
     37 #include "tool_cfgable.h"
     38 
     39 #include "memdebug.h" /* keep this as LAST include */
     40 
     41 struct finder {
     42   const char *env;
     43   const char *append;
     44   bool withoutdot;
     45 };
     46 
     47 /* The order of the variables below is important, as the index number is used
     48    in the findfile() function */
     49 static const struct finder conf_list[] = {
     50   { "CURL_HOME", NULL, FALSE },
     51   { "XDG_CONFIG_HOME", NULL, TRUE },
     52   { "HOME", NULL, FALSE },
     53 #ifdef _WIN32
     54   { "USERPROFILE", NULL, FALSE },
     55   { "APPDATA", NULL, FALSE },
     56   { "USERPROFILE", "\\Application Data", FALSE},
     57 #endif
     58   /* these are for .curlrc if XDG_CONFIG_HOME is not defined */
     59   { "CURL_HOME", "/.config", TRUE },
     60   { "HOME", "/.config", TRUE },
     61 
     62   { NULL, NULL, FALSE }
     63 };
     64 
     65 static char *checkhome(const char *home, const char *fname, bool dotscore)
     66 {
     67   const char pref[2] = { '.', '_' };
     68   int i;
     69   for(i = 0; i < (dotscore ? 2 : 1); i++) {
     70     char *c;
     71     if(dotscore)
     72       c = aprintf("%s" DIR_CHAR "%c%s", home, pref[i], &fname[1]);
     73     else
     74       c = aprintf("%s" DIR_CHAR "%s", home, fname);
     75     if(c) {
     76       int fd = open(c, O_RDONLY);
     77       if(fd >= 0) {
     78         char *path = strdup(c);
     79         close(fd);
     80         curl_free(c);
     81         return path;
     82       }
     83       curl_free(c);
     84     }
     85   }
     86   return NULL;
     87 }
     88 
     89 /*
     90  * findfile() - return the full path name of the file.
     91  *
     92  * If 'dotscore' is TRUE, then check for the file first with a leading dot
     93  * and then with a leading underscore.
     94  *
     95  * 1. Iterate over the environment variables in order, and if set, check for
     96  *    the given file to be accessed there, then it is a match.
     97  * 2. Non-Windows: try getpwuid
     98  */
     99 char *findfile(const char *fname, int dotscore)
    100 {
    101   int i;
    102   DEBUGASSERT(fname && fname[0]);
    103   DEBUGASSERT((dotscore != 1) || (fname[0] == '.'));
    104 
    105   if(!fname[0])
    106     return NULL;
    107 
    108   for(i = 0; conf_list[i].env; i++) {
    109     char *home = curl_getenv(conf_list[i].env);
    110     if(home) {
    111       char *path;
    112       const char *filename = fname;
    113       if(!home[0]) {
    114         curl_free(home);
    115         continue;
    116       }
    117       if(conf_list[i].append) {
    118         char *c = aprintf("%s%s", home, conf_list[i].append);
    119         curl_free(home);
    120         if(!c)
    121           return NULL;
    122         home = c;
    123       }
    124       if(conf_list[i].withoutdot) {
    125         if(!dotscore) {
    126           /* this is not looking for .curlrc, or the XDG_CONFIG_HOME was
    127              defined so we skip the extended check */
    128           curl_free(home);
    129           continue;
    130         }
    131         filename++; /* move past the leading dot */
    132         dotscore = 0; /* disable it for this check */
    133       }
    134       path = checkhome(home, filename, dotscore ? dotscore - 1 : 0);
    135       curl_free(home);
    136       if(path)
    137         return path;
    138     }
    139   }
    140 #if defined(HAVE_GETPWUID) && defined(HAVE_GETEUID)
    141   {
    142     struct passwd *pw = getpwuid(geteuid());
    143     if(pw) {
    144       char *home = pw->pw_dir;
    145       if(home && home[0])
    146         return checkhome(home, fname, FALSE);
    147     }
    148   }
    149 #endif /* PWD-stuff */
    150   return NULL;
    151 }