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[RFC] usage of environment variable from the command line
- From: Denis PILAT <denis dot pilat at st dot com>
- To: gdb-patches at sourceware dot org
- Date: Wed, 19 Sep 2007 17:24:26 +0200
- Subject: [RFC] usage of environment variable from the command line
Hi,
I have a patch that allows to use environment variable when typing commands.
Environment variable must be surrounded by "%%" string.
(Ex: "file %%REPOSITORY%%/obj/a.out" would be supported.)
Is there any chance that such a patch could be accepted ?
I've read from the gdb mailing list that I'm not the only one who wants
to handle environment variable from the command line.
Thanks for your feedback,
--
Denis
Index: top.c
===================================================================
--- top.c (revision 598)
+++ top.c (working copy)
@@ -370,6 +370,46 @@ do_chdir_cleanup (void *old_dir)
}
#endif
+#define ENV_DELIMITOR "%%"
+static char*
+evaluate_environment_from_string(char* input)
+{
+ char *p1, *p2, *output, *env_var, *env_var_value;
+ int env_var_len;
+
+
+ p1 = (char *) strstr (input, ENV_DELIMITOR);
+ if (p1 == NULL)
+ return input;
+
+ p2 = (char *) strstr (p1+1, ENV_DELIMITOR);
+ if (p2 == NULL)
+ return input;
+
+ /* get the env var. */
+ env_var_len = p2 - p1 - strlen(ENV_DELIMITOR);
+ env_var = xmalloc (env_var_len + 1);
+ strncpy (env_var, p1 + strlen(ENV_DELIMITOR), env_var_len);
+ env_var[env_var_len] = 0;
+
+ /* get its value. */
+ env_var_value = getenv (env_var);
+ if (env_var_value == NULL) {
+ xfree (env_var);
+ return input;
+ }
+
+ /* replace this value into the original string. */
+ output = xmalloc (strlen (input) + strlen (env_var_value) - env_var_len - 2*strlen(ENV_DELIMITOR) + 1);
+ strncpy (output, input, p1-input);
+ strcpy (output+(p1-input), env_var_value);
+ strcat (output+(p1-input), p2 + strlen(ENV_DELIMITOR));
+
+ xfree (env_var);
+ return evaluate_environment_from_string(output);
+}
+
+
/* Execute the line P as a command.
Pass FROM_TTY as second argument to the defining function. */
/* Force cleanup of any alloca areas if using C alloca instead of
@@ -391,6 +431,8 @@ execute_command (char *p, int from_tty)
if (p == NULL)
return;
+ p = evaluate_environment_from_string (p);
+
serial_log_command (p);
while (*p == ' ' || *p == '\t')