1 files changed, 87 insertions, 26 deletions
diff --git a/src/posix-util.c b/src/posix-util.c
index fd44507..f7e0a17 100644
--- a/src/posix-util.c
+++ b/src/posix-util.c
@@ -29,48 +29,109 @@
 
 #include "util.h"
 #include "sys-util.h"
+#include "debug.h"
 
-const char *
-_gpgme_get_gpg_path (void)
+/* These variables store the malloced name of alternative default
+   binaries.  The are set only once by gpgme_set_global_flag.  */
+static char *default_gpg_name;
+static char *default_gpgconf_name;
+
+/* Set the default name for the gpg binary.  This function may only be
+   called by gpgme_set_global_flag.  Returns 0 on success.  Leading
+   directories are removed from NAME.  */
+int
+_gpgme_set_default_gpg_name (const char *name)
 {
-#ifdef GPG_PATH
-  return GPG_PATH;
-#else
-  return NULL;
-#endif
+  const char *s;
+
+  s = strrchr (name, '/');
+  if (s)
+    name = s + 1;
+
+  if (!default_gpg_name)
+    default_gpg_name = strdup (name);
+  return !default_gpg_name;
 }
 
-const char *
-_gpgme_get_gpgsm_path (void)
+/* Set the default name for the gpgconf binary.  This function may
+   only be called by gpgme_set_global_flag.  Returns 0 on success.
+   Leading directories are removed from NAME.  */
+int
+_gpgme_set_default_gpgconf_name (const char *name)
 {
-#ifdef GPGSM_PATH
-  return GPGSM_PATH;
-#else
-  return NULL;
-#endif
+  const char *s;
+
+  s = strrchr (name, '/');
+  if (s)
+    name = s + 1;
+
+  if (!default_gpgconf_name)
+    default_gpgconf_name = strdup (name);
+  return !default_gpgconf_name;
 }
 
-const char *
-_gpgme_get_gpgconf_path (void)
+
+/* Find an executable program PGM along the envvar PATH.  */
+static char *
+walk_path (const char *pgm)
 {
-#ifdef GPGCONF_PATH
-  return GPGCONF_PATH;
+  const char *orig_path, *path, *s;
+  char *fname, *p;
+
+#ifdef FIXED_SEARCH_PATH
+  orig_path = FIXED_SEARCH_PATH;
 #else
-  return NULL;
+  orig_path = getenv ("PATH");
+  if (!orig_path)
+    orig_path = "/bin:/usr/bin";
 #endif
+
+  fname = malloc (strlen (orig_path) + 1 + strlen (pgm) + 1);
+  if (!fname)
+    return NULL;
+
+  path = orig_path;
+  for (;;)
+    {
+      for (s=path, p=fname; *s && *s != ':'; s++, p++)
+        *p = *s;
+      if (p != fname && p[-1] != '/')
+        *p++ = '/';
+      strcpy (p, pgm);
+      if (!access (fname, X_OK))
+        return fname;
+      if (!*s)
+        break;
+      path = s + 1;
+    }
+
+  _gpgme_debug (DEBUG_ENGINE, "gpgme-walk_path: '%s' not found in '%s'",
+                pgm, orig_path);
+
+  free (fname);
+  return NULL;
 }
 
-const char *
-_gpgme_get_g13_path (void)
+
+/* Return the full file name of the GPG binary.  This function is used
+   if gpgconf was not found and thus it can be assumed that gpg2 is
+   not installed.  This function is only called by get_gpgconf_item
+   and may not be called concurrently.  */
+char *
+_gpgme_get_gpg_path (void)
 {
-#ifdef G13_PATH
-  return G13_PATH;
-#else
-  return NULL;
-#endif
+  return walk_path (default_gpg_name? default_gpg_name : "gpg");
 }
 
 
+/* This function is only called by get_gpgconf_item and may not be
+   called concurrently.  */
+char *
+_gpgme_get_gpgconf_path (void)
+{
+  return walk_path (default_gpgconf_name? default_gpgconf_name : "gpgconf");
+}
+
 /* See w32-util.c */
 int
 _gpgme_get_conf_int (const char *key, int *value)