X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=usage.c;h=52c2e960560531b62a28a8a716e531093fd5e8a7;hb=5e2b0636c709884e45ef941cd4514c225f204982;hp=1fa924c3d9ed8f70523685c26cf169316b366598;hpb=5e80092f7e6db09a40a62e837ca3f74f0bc5ad73;p=git.git

diff --git a/usage.c b/usage.c
index 1fa924c3d..52c2e9605 100644
--- a/usage.c
+++ b/usage.c
@@ -12,20 +12,58 @@ static void report(const char *prefix, const char *err, va_list params)
 	fputs("\n", stderr);
 }
 
-void usage(const char *err)
+static NORETURN void usage_builtin(const char *err)
 {
 	fprintf(stderr, "usage: %s\n", err);
 	exit(129);
 }
 
+static NORETURN void die_builtin(const char *err, va_list params)
+{
+	report("fatal: ", err, params);
+	exit(128);
+}
+
+static void error_builtin(const char *err, va_list params)
+{
+	report("error: ", err, params);
+}
+
+
+/* If we are in a dlopen()ed .so write to a global variable would segfault
+ * (ugh), so keep things static. */
+static void (*usage_routine)(const char *err) NORETURN = usage_builtin;
+static void (*die_routine)(const char *err, va_list params) NORETURN = die_builtin;
+static void (*error_routine)(const char *err, va_list params) = error_builtin;
+
+void set_usage_routine(void (*routine)(const char *err) NORETURN)
+{
+	usage_routine = routine;
+}
+
+void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN)
+{
+	die_routine = routine;
+}
+
+void set_error_routine(void (*routine)(const char *err, va_list params))
+{
+	error_routine = routine;
+}
+
+
+void usage(const char *err)
+{
+	usage_routine(err);
+}
+
 void die(const char *err, ...)
 {
 	va_list params;
 
 	va_start(params, err);
-	report("fatal: ", err, params);
+	die_routine(err, params);
 	va_end(params);
-	exit(128);
 }
 
 int error(const char *err, ...)
@@ -33,7 +71,7 @@ int error(const char *err, ...)
 	va_list params;
 
 	va_start(params, err);
-	report("error: ", err, params);
+	error_routine(err, params);
 	va_end(params);
 	return -1;
 }