1 files changed, 134 insertions, 0 deletions
diff --git a/src/tool_findfile.c b/src/tool_findfile.c
new file mode 100644
index 000000000..cda8c8ed8
--- /dev/null
+++ b/src/tool_findfile.c
@@ -0,0 +1,134 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+#include "tool_setup.h"
+
+#ifdef HAVE_PWD_H
+#  undef __NO_NET_API /* required for building for AmigaOS */
+#  include <pwd.h>
+#endif
+
+#ifdef HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#ifdef HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+
+#include <curl/mprintf.h>
+
+#include "tool_findfile.h"
+
+#include "memdebug.h" /* keep this as LAST include */
+
+struct finder {
+  const char *env;
+  const char *append;
+};
+
+static const struct finder list[] = {
+  { "CURL_HOME", NULL },
+  { "XDG_CONFIG_HOME", NULL },
+  { "HOME", NULL },
+#ifdef WIN32
+  { "USERPROFILE", NULL },
+  { "APPDATA", NULL },
+  { "USERPROFILE", "\\Application Data"},
+#endif
+  { NULL, NULL }
+};
+
+static char *checkhome(const char *home, const char *fname, bool dotscore)
+{
+  const char pref[2] = { '.', '_' };
+  int i;
+  for(i = 0; i < (dotscore ? 2 : 1); i++) {
+    char *c;
+    if(dotscore)
+      c = curl_maprintf("%s" DIR_CHAR "%c%s", home, pref[i], &fname[1]);
+    else
+      c = curl_maprintf("%s" DIR_CHAR "%s", home, fname);
+    if(c) {
+      int fd = open(c, O_RDONLY);
+      if(fd >= 0) {
+        char *path = strdup(c);
+        close(fd);
+        curl_free(c);
+        return path;
+      }
+      curl_free(c);
+    }
+  }
+  return NULL;
+}
+
+/*
+ * findfile() - return the full path name of the file.
+ *
+ * If 'dotscore' is TRUE, then check for the file first with a leading dot
+ * and then with a leading underscore.
+ *
+ * 1. Iterate over the environment variables in order, and if set, check for
+ *    the given file to be accessed there, then it is a match.
+ * 2. Non-windows: try getpwuid
+ */
+char *findfile(const char *fname, bool dotscore)
+{
+  int i;
+  DEBUGASSERT(fname && fname[0]);
+  DEBUGASSERT(!dotscore || (fname[0] == '.'));
+
+  if(!fname[0])
+    return NULL;
+
+  for(i = 0; list[i].env; i++) {
+    char *home = curl_getenv(list[i].env);
+    if(home) {
+      char *path;
+      if(!home[0]) {
+        curl_free(home);
+        continue;
+      }
+      if(list[i].append) {
+        char *c = curl_maprintf("%s%s", home, list[i].append);
+        curl_free(home);
+        if(!c)
+          return NULL;
+        home = c;
+      }
+      path = checkhome(home, fname, dotscore);
+      curl_free(home);
+      if(path)
+        return path;
+    }
+  }
+#if defined(HAVE_GETPWUID) && defined(HAVE_GETEUID)
+  {
+    struct passwd *pw = getpwuid(geteuid());
+    if(pw) {
+      char *home = pw->pw_dir;
+      if(home && home[0])
+        return checkhome(home, fname, FALSE);
+    }
+  }
+#endif /* PWD-stuff */
+  return NULL;
+}