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-rw-r--r--usage.c96
1 files changed, 96 insertions, 0 deletions
diff --git a/usage.c b/usage.c
new file mode 100644
index 0000000000..a5fc4ec5fa
--- /dev/null
+++ b/usage.c
@@ -0,0 +1,96 @@
+/*
+ * GIT - The information manager from hell
+ *
+ * Copyright (C) Linus Torvalds, 2005
+ */
+#include "git-compat-util.h"
+
+static void report(const char *prefix, const char *err, va_list params)
+{
+ char msg[256];
+ vsnprintf(msg, sizeof(msg), err, params);
+ fprintf(stderr, "%s%s\n", prefix, msg);
+}
+
+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);
+ die_routine(err, params);
+ va_end(params);
+}
+
+int error(const char *err, ...)
+{
+ va_list params;
+
+ va_start(params, err);
+ error_routine(err, params);
+ va_end(params);
+ return -1;
+}
+
+void warning(const char *warn, ...)
+{
+ va_list params;
+
+ va_start(params, warn);
+ warn_routine(warn, params);
+ va_end(params);
+}