Fix export_marks() error handling.

diff --git a/compat/snprintf.c b/compat/snprintf.c
index 580966e56a3455b9970b7eef33143c1e9c57d41c..357e733074ea7c85f880fa577ad65dfb3787fec7 100644 (file)
--- a/compat/snprintf.c
+++ b/compat/snprintf.c
@@ -17,6 +17,8 @@ int git_vsnprintf(char *str, size_t maxsize, const char *format, va_list ap)
 
        if (maxsize > 0) {
                ret = vsnprintf(str, maxsize-SNPRINTF_SIZE_CORR, format, ap);
+               if (ret == maxsize-1)
+                       ret = -1;
                /* Windows does not NUL-terminate if result fills buffer */
                str[maxsize-1] = 0;
        }
@@ -34,6 +36,8 @@ int git_vsnprintf(char *str, size_t maxsize, const char *format, va_list ap)
                        break;
                s = str;
                ret = vsnprintf(str, maxsize-SNPRINTF_SIZE_CORR, format, ap);
+               if (ret == maxsize-1)
+                       ret = -1;
        }
        free(s);
        return ret;