mingw: avoid using strbuf in syslog

strbuf can call die, which again can call syslog from git-daemon.

Endless recursion is no fun; fix it by hand-rolling the logic. As
a side-effect malloc/realloc errors are changed into non-fatal
warnings; this is probably an improvement anyway.

Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com>
Noticed-by: Johannes Sixt <j.sixt@viscovery.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/compat/win32/syslog.c b/compat/win32/syslog.c
index 42b95a9b5169125fac7bde3caabb15f4cb6a351d..d015e436d57472bf9560a6f604705f52938c9f19 100644 (file)
--- a/compat/win32/syslog.c
+++ b/compat/win32/syslog.c
@@ -1,5 +1,4 @@
 #include "../../git-compat-util.h"
-#include "../../strbuf.h"
 
 static HANDLE ms_eventlog;
 
@@ -16,13 +15,8 @@ void openlog(const char *ident, int logopt, int facility)
 
 void syslog(int priority, const char *fmt, ...)
 {
-       struct strbuf sb = STRBUF_INIT;
-       struct strbuf_expand_dict_entry dict[] = {
-               {"1", "% 1"},
-               {NULL, NULL}
-       };
        WORD logtype;
-       char *str;
+       char *str, *pos;
        int str_len;
        va_list ap;
 
@@ -39,11 +33,24 @@ void syslog(int priority, const char *fmt, ...)
        }
 
        str = malloc(str_len + 1);
+       if (!str) {
+               warning("malloc failed: '%s'", strerror(errno));
+               return;
+       }
+
        va_start(ap, fmt);
        vsnprintf(str, str_len + 1, fmt, ap);
        va_end(ap);
-       strbuf_expand(&sb, str, strbuf_expand_dict_cb, &dict);
-       free(str);
+
+       while ((pos = strstr(str, "%1")) != NULL) {
+               str = realloc(str, ++str_len + 1);
+               if (!str) {
+                       warning("realloc failed: '%s'", strerror(errno));
+                       return;
+               }
+               memmove(pos + 2, pos + 1, strlen(pos));
+               pos[1] = ' ';
+       }
 
        switch (priority) {
        case LOG_EMERG:
@@ -66,7 +73,6 @@ void syslog(int priority, const char *fmt, ...)
        }
 
        ReportEventA(ms_eventlog, logtype, 0, 0, NULL, 1, 0,
-           (const char **)&sb.buf, NULL);
-
-       strbuf_release(&sb);
+           (const char **)&str, NULL);
+       free(str);
 }