GIT-VERSION-FILE: check ./version first.

[thirdparty/git.git] / usage.c

diff --git a/usage.c b/usage.c
index 1fa924c3d9ed8f70523685c26cf169316b366598..4dc5c77633747e0c2b3a4d04fddbd043f8f49e1e 100644 (file)
--- a/usage.c
+++ b/usage.c
@@ -12,20 +12,68 @@ 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);
+}
+
+static void warn_builtin(const char *warn, va_list params)
+{
+       report("warning: ", warn, 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;
+static void (*warn_routine)(const char *err, va_list params) = warn_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 set_warn_routine(void (*routine)(const char *warn, va_list params))
+{
+       warn_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 +81,16 @@ 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;
 }
+
+void warn(const char *warn, ...)
+{
+       va_list params;
+
+       va_start(params, warn);
+       warn_routine(warn, params);
+       va_end(params);
+}