lttng: list valid condition / action names if missing or unknown

[lttng-tools.git] / src / common / argpar-utils / argpar-utils.c

diff --git a/src/common/argpar-utils/argpar-utils.c b/src/common/argpar-utils/argpar-utils.c
index 6f5548917abf755f2c7fda3c9776f08a7d2de2d6..493598693632ec32556a0260488a7d16662c8a84 100644 (file)
--- a/src/common/argpar-utils/argpar-utils.c
+++ b/src/common/argpar-utils/argpar-utils.c
@@ -12,8 +12,6 @@
 #include <common/error.h>
 #include <common/string-utils/string-utils.h>
 
-#define WHILE_PARSING_ARG_N_ARG_FMT "While parsing argument #%d (`%s`): "
-
 /*
  * Given argpar error status `status` and error `error`, return a formatted
  * error message describing the error.
@@ -23,10 +21,12 @@
  * `context_fmt`, if non-NULL, is formatted using `args` and prepended to the
  * error message.
  *
+ * Add `argc_offset` the the argument index mentioned in the error message.
+ *
  * The returned string must be freed by the caller.
  */
-static ATTR_FORMAT_PRINTF(3, 0)
-char *format_arg_error_v(const struct argpar_error *error,
+static ATTR_FORMAT_PRINTF(4, 0)
+char *format_arg_error_v(const struct argpar_error *error, int argc_offset,
                const char **argv, const char *context_fmt, va_list args)
 {
        char *str = NULL;
@@ -59,7 +59,7 @@ char *format_arg_error_v(const struct argpar_error *error,
 
                ret = strutils_appendf(&str,
                        WHILE_PARSING_ARG_N_ARG_FMT "Missing required argument for option `%s`",
-                       orig_index + 1, arg, arg);
+                       orig_index + 1 + argc_offset, argv[orig_index], arg);
                if (ret < 0) {
                        goto end;
                }
@@ -77,11 +77,11 @@ char *format_arg_error_v(const struct argpar_error *error,
                if (is_short) {
                        ret = strutils_appendf(&str,
                                WHILE_PARSING_ARG_N_ARG_FMT "Unexpected argument for option `-%c`",
-                               orig_index + 1, arg, descr->short_name);
+                               orig_index + 1 + argc_offset, arg, descr->short_name);
                } else {
                        ret = strutils_appendf(&str,
                                WHILE_PARSING_ARG_N_ARG_FMT "Unexpected argument for option `--%s`",
-                               orig_index + 1, arg, descr->long_name);
+                               orig_index + 1 + argc_offset, arg, descr->long_name);
                }
 
                if (ret < 0) {
@@ -97,7 +97,7 @@ char *format_arg_error_v(const struct argpar_error *error,
 
                ret = strutils_appendf(&str,
                        WHILE_PARSING_ARG_N_ARG_FMT "Unknown option `%s`",
-                       orig_index + 1, argv[orig_index], unknown_opt);
+                       orig_index + 1 + argc_offset, argv[orig_index], unknown_opt);
 
                if (ret < 0) {
                        goto end;
@@ -118,8 +118,10 @@ end:
 }
 
 enum parse_next_item_status parse_next_item(struct argpar_iter *iter,
-               const struct argpar_item **item, const char **argv,
-               bool unknown_opt_is_error, const char *context_fmt, ...)
+               const struct argpar_item **item, int argc_offset,
+               const char **argv, bool unknown_opt_is_error,
+               const struct argpar_error **error_out,
+               const char *context_fmt, ...)
 {
        enum argpar_iter_next_status status;
        const struct argpar_error *error = NULL;
@@ -131,7 +133,7 @@ enum parse_next_item_status parse_next_item(struct argpar_iter *iter,
        switch (status) {
        case ARGPAR_ITER_NEXT_STATUS_ERROR_MEMORY:
                ERR("Failed to get next argpar item.");
-               ret = PARSE_NEXT_ITEM_STATUS_ERROR;
+               ret = PARSE_NEXT_ITEM_STATUS_ERROR_MEMORY;
                break;
        case ARGPAR_ITER_NEXT_STATUS_ERROR:
        {
@@ -145,7 +147,8 @@ enum parse_next_item_status parse_next_item(struct argpar_iter *iter,
                }
 
                va_start(args, context_fmt);
-               err_str = format_arg_error_v(error, argv, context_fmt, args);
+               err_str = format_arg_error_v(error, argc_offset, argv,
+                       context_fmt, args);
                va_end(args);
 
                if (err_str) {
@@ -168,6 +171,12 @@ enum parse_next_item_status parse_next_item(struct argpar_iter *iter,
                abort();
        }
 
+       if (error_out) {
+               argpar_error_destroy(*error_out);
+               *error_out = error;
+               error = NULL;
+       }
+
        argpar_error_destroy(error);
 
        return ret;