Merge branch 'jk/long-error-messages'

The codepath to produce error messages had a hard-coded limit to
the size of the message, primarily to avoid memory allocation while
calling die().

* jk/long-error-messages:
vreportf: avoid intermediate buffer
vreportf: report to arbitrary filehandles

diff --git a/git-compat-util.h b/git-compat-util.h
index 392da79029f15e4e56f419e7781d5aabb991bec7..f649e81f1107722f4c7d051201920ae2a0e7846a 100644 (file)
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -389,7 +389,6 @@ struct strbuf;
 
 /* General helper functions */
 extern void vreportf(const char *prefix, const char *err, va_list params);
-extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 extern NORETURN void usage(const char *err);
 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
@@ -425,6 +424,7 @@ static inline int const_error(void)
 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 extern void set_die_is_recursing_routine(int (*routine)(void));
+extern void set_error_handle(FILE *);
 
 extern int starts_with(const char *str, const char *prefix);
 

diff --git a/run-command.c b/run-command.c
index 28e1d55cb934d083eaf6ba6bed04d0716da5db08..3277cf797ed41e5834b3b94fa8d2e9e9d5b4a317 100644 (file)
--- a/run-command.c
+++ b/run-command.c
@@ -200,7 +200,6 @@ static int execv_shell_cmd(const char **argv)
 #endif
 
 #ifndef GIT_WINDOWS_NATIVE
-static int child_err = 2;
 static int child_notifier = -1;
 
 static void notify_parent(void)
@@ -212,17 +211,6 @@ static void notify_parent(void)
         */
        xwrite(child_notifier, "", 1);
 }
-
-static NORETURN void die_child(const char *err, va_list params)
-{
-       vwritef(child_err, "fatal: ", err, params);
-       exit(128);
-}
-
-static void error_child(const char *err, va_list params)
-{
-       vwritef(child_err, "error: ", err, params);
-}
 #endif
 
 static inline void set_cloexec(int fd)
@@ -362,11 +350,10 @@ int start_command(struct child_process *cmd)
                 * in subsequent call paths use the parent's stderr.
                 */
                if (cmd->no_stderr || need_err) {
-                       child_err = dup(2);
+                       int child_err = dup(2);
                        set_cloexec(child_err);
+                       set_error_handle(fdopen(child_err, "w"));
                }
-               set_die_routine(die_child);
-               set_error_routine(error_child);
 
                close(notify_pipe[0]);
                set_cloexec(notify_pipe[1]);

diff --git a/usage.c b/usage.c
index ed146453cabeb9e82bef0c5610cda47d1b2a0b1c..82ff13163b542aab07e68bfa1056dc46316634a1 100644 (file)
--- a/usage.c
+++ b/usage.c
@@ -6,23 +6,22 @@
 #include "git-compat-util.h"
 #include "cache.h"
 
+static FILE *error_handle;
+static int tweaked_error_buffering;
+
 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);
-}
+       FILE *fh = error_handle ? error_handle : stderr;
 
-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);
+       fflush(fh);
+       if (!tweaked_error_buffering) {
+               setvbuf(fh, NULL, _IOLBF, 0);
+               tweaked_error_buffering = 1;
+       }
 
-       write_in_full(fd, prefix, strlen(prefix));
-       write_in_full(fd, msg, len);
-       write_in_full(fd, "\n", 1);
+       fputs(prefix, fh);
+       vfprintf(fh, err, params);
+       fputc('\n', fh);
 }
 
 static NORETURN void usage_builtin(const char *err, va_list params)
@@ -76,6 +75,12 @@ void set_die_is_recursing_routine(int (*routine)(void))
        die_is_recursing = routine;
 }
 
+void set_error_handle(FILE *fh)
+{
+       error_handle = fh;
+       tweaked_error_buffering = 0;
+}
+
 void NORETURN usagef(const char *err, ...)
 {
        va_list params;