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authorPetr Baudis <pasky@suse.cz>2006-06-24 02:34:38 (GMT)
committerJunio C Hamano <junkio@cox.net>2006-06-24 07:12:52 (GMT)
commit39a3f5ea7c0352a530338d30d4e618f6b4db84e4 (patch)
tree4e9b71c23ccb877c6ee73eeca278ad5c604a8eb9
parent5e7c91d6f744dbf9a18152d2d49057aa3dd06160 (diff)
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Customizable error handlers
This patch makes the usage(), die() and error() handlers customizable. Nothing in the git code itself uses that but many other libgit users (like Git.pm) will. This is implemented using the mutator functions primarily because you cannot directly modifying global variables of libgit from a program that dlopen()ed it, apparently. But having functions for that is a better API anyway. Signed-off-by: Petr Baudis <pasky@suse.cz> Signed-off-by: Junio C Hamano <junkio@cox.net>
-rw-r--r--git-compat-util.h4
-rw-r--r--usage.c46
2 files changed, 46 insertions, 4 deletions
diff --git a/git-compat-util.h b/git-compat-util.h
index 5d543d2..b3d4cf5 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -40,6 +40,10 @@ extern void usage(const char *err) NORETURN;
extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
+extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
+extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
+extern void set_error_routine(void (*routine)(const char *err, va_list params));
+
#ifdef NO_MMAP
#ifndef PROT_READ
diff --git a/usage.c b/usage.c
index 1fa924c..b781b00 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)
+void usage_builtin(const char *err)
{
fprintf(stderr, "usage: %s\n", err);
exit(129);
}
+void die_builtin(const char *err, va_list params)
+{
+ report("fatal: ", err, params);
+ exit(128);
+}
+
+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;
}