error: Track locations in configuration files

New LOC_FILE.  Use it for tracking file name and line number in
qemu_config_parse().  We now report errors like

    qemu:foo.conf:42: Did not find I2C bus for smbus-eeprom

In particular, gems like this message:

    -device: no driver specified

become almost nice now:

    qemu:foo.conf:44: -device: no driver specified

(A later commit will get rid of the bogus -device:)

1 files changed, 2 insertions, 1 deletions

diff --git a/qemu-error.h b/qemu-error.h
index 204dfb6a97..8f2a140ef2 100644
--- a/qemu-error.h
+++ b/qemu-error.h
@@ -15,7 +15,7 @@
 
 typedef struct Location {
     /* all members are private to qemu-error.c */
-    enum { LOC_NONE } kind;
+    enum { LOC_NONE, LOC_FILE } kind;
     int num;
     const void *ptr;
     struct Location *prev;
@@ -27,6 +27,7 @@ Location *loc_pop(Location *loc);
 Location *loc_save(Location *loc);
 void loc_restore(Location *loc);
 void loc_set_none(void);
+void loc_set_file(const char *fname, int lno);
 
 void error_vprintf(const char *fmt, va_list ap);
 void error_printf(const char *fmt, ...) __attribute__ ((format(printf, 1, 2)));