[Libguestfs] [PATCH 1/3] fish: Move 'is_true' function to library utilities.

[Richard W.M. Jones]

The 'is_true' function can be useful elsewhere, not just for parsing
guestfish command parameters.

This is just code motion.
---
 fish/fish.c                     | 26 --------------------------
 generator/fish.ml               | 21 ++++++++++++++++-----
 src/guestfs-internal-frontend.h |  1 +
 src/utils.c                     | 23 +++++++++++++++++++++++
 4 files changed, 40 insertions(+), 31 deletions(-)

diff --git a/fish/fish.c b/fish/fish.c
index 20511f8..d055e37 100644
--- a/fish/fish.c
+++ b/fish/fish.c
@@ -1302,32 +1302,6 @@ print_table (char *const *argv)
     printf ("%s: %s\n", argv[i], argv[i+1]);
 }
 
-int
-is_true (const char *str)
-{
-  /* Similar to Tcl_GetBoolean. */
-
-  if (STREQ (str, "1") ||
-      STRCASEEQ (str, "true") ||
-      STRCASEEQ (str, "t") ||
-      STRCASEEQ (str, "yes") ||
-      STRCASEEQ (str, "y") ||
-      STRCASEEQ (str, "on"))
-    return 1;
-
-  if (STREQ (str, "0") ||
-      STRCASEEQ (str, "false") ||
-      STRCASEEQ (str, "f") ||
-      STRCASEEQ (str, "no") ||
-      STRCASEEQ (str, "n") ||
-      STRCASEEQ (str, "off"))
-    return 0;
-
-  fprintf (stderr, _("%s: '%s': invalid boolean value, use 'true' or 'false'\n"),
-           program_name, str);
-  return -1;
-}
-
 /* Free strings from a non-NULL terminated char** */
 static void
 free_n_strings (char **str, size_t len)
diff --git a/generator/fish.ml b/generator/fish.ml
index b609ce9..c7ef303 100644
--- a/generator/fish.ml
+++ b/generator/fish.ml
@@ -84,12 +84,15 @@ let generate_fish_cmds () =
   pr "#include <string.h>\n";
   pr "#include <inttypes.h>\n";
   pr "#include <libintl.h>\n";
+  pr "#include <errno.h>\n";
   pr "\n";
   pr "#include \"c-ctype.h\"\n";
   pr "#include \"full-write.h\"\n";
   pr "#include \"xstrtol.h\"\n";
   pr "\n";
-  pr "#include <guestfs.h>\n";
+  pr "#include \"guestfs.h\"\n";
+  pr "#include \"guestfs-internal-frontend.h\"\n";
+  pr "\n";
   pr "#include \"fish.h\"\n";
   pr "#include \"fish-cmds.h\"\n";
   pr "#include \"options.h\"\n";
@@ -469,8 +472,12 @@ Guestfish will prompt for these separately."
             pr "    input_lineno++;\n";
             pr "  if (%s == NULL) goto out_%s;\n" name name
         | Bool name ->
-            pr "  switch (is_true (argv[i++])) {\n";
-            pr "    case -1: goto out_%s;\n" name;
+            pr "  switch (guestfs___is_true (argv[i++])) {\n";
+            pr "    case -1:\n";
+            pr "      fprintf (stderr,\n";
+            pr "               _(\"%%s: '%%s': invalid boolean value, use 'true' or 'false'\\n\"),\n";
+            pr "               program_name, argv[i-1]);\n";
+            pr "      goto out_%s;\n" name;
             pr "    case 0:  %s = 0; break;\n" name;
             pr "    default: %s = 1;\n" name;
             pr "  }\n"
@@ -508,8 +515,12 @@ Guestfish will prompt for these separately."
             pr "if (STRPREFIX (argv[i], \"%s:\")) {\n" n;
             (match argt with
              | OBool n ->
-                 pr "      switch (is_true (&argv[i][%d])) {\n" (len+1);
-                 pr "        case -1: goto out;\n";
+                 pr "      switch (guestfs___is_true (&argv[i][%d])) {\n" (len+1);
+                 pr "        case -1:\n";
+                 pr "          fprintf (stderr,\n";
+                 pr "                   _(\"%%s: '%%s': invalid boolean value, use 'true' or 'false'\\n\"),\n";
+                 pr "                   program_name, &argv[i][%d]);\n" (len+1);
+                 pr "          goto out;\n";
                  pr "        case 0:  optargs_s.%s = 0; break;\n" n;
                  pr "        default: optargs_s.%s = 1;\n" n;
                  pr "      }\n"
diff --git a/src/guestfs-internal-frontend.h b/src/guestfs-internal-frontend.h
index cddf719..57aeeda 100644
--- a/src/guestfs-internal-frontend.h
+++ b/src/guestfs-internal-frontend.h
@@ -105,6 +105,7 @@ extern char **guestfs___split_string (char sep, const char *);
 extern char *guestfs___exit_status_to_string (int status, const char *cmd_name, char *buffer, size_t buflen);
 extern int guestfs___random_string (char *ret, size_t len);
 extern char *guestfs___drive_name (size_t index, char *ret);
+extern int guestfs___is_true (const char *str);
 
 /* These functions are used internally by the CLEANUP_* macros.
  * Don't call them directly.
diff --git a/src/utils.c b/src/utils.c
index be7f643..11c6953 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -270,3 +270,26 @@ guestfs___drive_name (size_t index, char *ret)
   *ret = '\0';
   return ret;
 }
+
+/* Similar to Tcl_GetBoolean. */
+int
+guestfs___is_true (const char *str)
+{
+  if (STREQ (str, "1") ||
+      STRCASEEQ (str, "true") ||
+      STRCASEEQ (str, "t") ||
+      STRCASEEQ (str, "yes") ||
+      STRCASEEQ (str, "y") ||
+      STRCASEEQ (str, "on"))
+    return 1;
+
+  if (STREQ (str, "0") ||
+      STRCASEEQ (str, "false") ||
+      STRCASEEQ (str, "f") ||
+      STRCASEEQ (str, "no") ||
+      STRCASEEQ (str, "n") ||
+      STRCASEEQ (str, "off"))
+    return 0;
+
+  return -1;
+}
-- 
2.1.0