grep doc: add --break / --heading / -W to synopsis

[git.git] / usage.c

diff --git a/usage.c b/usage.c
index 79856a2b9f5bc4603252cb10b471a0815416a617..a2a667800474e315a362e1d0623c17dafaad1022 100644 (file)
--- a/usage.c
+++ b/usage.c
@@ -4,34 +4,47 @@
  * Copyright (C) Linus Torvalds, 2005
  */
 #include "git-compat-util.h"
+#include "cache.h"
 
-static void report(const char *prefix, const char *err, va_list params)
+void vreportf(const char *prefix, const char *err, va_list params)
 {
        char msg[4096];
        vsnprintf(msg, sizeof(msg), err, params);
        fprintf(stderr, "%s%s\n", prefix, msg);
 }
 
+void vwritef(int fd, const char *prefix, const char *err, va_list params)
+{
+       char msg[4096];
+       int len = vsnprintf(msg, sizeof(msg), err, params);
+       if (len > sizeof(msg))
+               len = sizeof(msg);
+
+       write_in_full(fd, prefix, strlen(prefix));
+       write_in_full(fd, msg, len);
+       write_in_full(fd, "\n", 1);
+}
+
 static NORETURN void usage_builtin(const char *err, va_list params)
 {
-       report("usage: ", err, params);
+       vreportf("usage: ", err, params);
        exit(129);
 }
 
 static NORETURN void die_builtin(const char *err, va_list params)
 {
-       report("fatal: ", err, params);
+       vreportf("fatal: ", err, params);
        exit(128);
 }
 
 static void error_builtin(const char *err, va_list params)
 {
-       report("error: ", err, params);
+       vreportf("error: ", err, params);
 }
 
 static void warn_builtin(const char *warn, va_list params)
 {
-       report("warning: ", warn, params);
+       vreportf("warning: ", warn, params);
 }
 
 /* If we are in a dlopen()ed .so write to a global variable would segfault
@@ -46,7 +59,12 @@ void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list param
        die_routine = routine;
 }
 
-void usagef(const char *err, ...)
+void set_error_routine(void (*routine)(const char *err, va_list params))
+{
+       error_routine = routine;
+}
+
+void NORETURN usagef(const char *err, ...)
 {
        va_list params;
 
@@ -55,12 +73,12 @@ void usagef(const char *err, ...)
        va_end(params);
 }
 
-void usage(const char *err)
+void NORETURN usage(const char *err)
 {
        usagef("%s", err);
 }
 
-void die(const char *err, ...)
+void NORETURN die(const char *err, ...)
 {
        va_list params;
 
@@ -69,7 +87,7 @@ void die(const char *err, ...)
        va_end(params);
 }
 
-void die_errno(const char *fmt, ...)
+void NORETURN die_errno(const char *fmt, ...)
 {
        va_list params;
        char fmt_with_err[1024];