[PATCH 2/5] libxl: add xlu_cfg_get_type function

[Andre Przywara <andre.przywara@amd.com>]

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As cpuid= can be used with two syntaxes (one as a list, the other as a
string), we need to distinguish them without an error message. Introduce 
a helper function to detect the type of entry used before issuing a warning.

Signed-off-by: Andre Przywara

-- 
Andre Przywara
AMD-Operating System Research Center (OSRC), Dresden, Germany
Tel: +49 351 448-3567-12

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>From ae2a1dda7829a38bb891f560d9fc458a4d8c9fba Mon Sep 17 00:00:00 2001
From: Andre Przywara <andre.przywara@amd.com>
Date: Wed, 1 Sep 2010 14:11:54 +0200
Subject: [PATCH 2/5] libxl: add xlu_cfg_get_type function

cpuid= can be used with two syntaxes, one as a list, the other as a
string. Introduce a helper function to detect the type of entry used
before issuing a warning.

Signed-off-by: Andre Przywara
---
 tools/libxl/libxlu_cfg.c |   18 ++++++++++++++++++
 tools/libxl/libxlutil.h  |    6 ++++++
 2 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/tools/libxl/libxlu_cfg.c b/tools/libxl/libxlu_cfg.c
index 09a7c71..b9018d5 100644
--- a/tools/libxl/libxlu_cfg.c
+++ b/tools/libxl/libxlu_cfg.c
@@ -124,6 +124,24 @@ static XLU_ConfigSetting *find(const XLU_Config *cfg, const char *n) {
     return 0;
 }
 
+int xlu_cfg_get_type(const XLU_Config *cfg, const char *n)
+{
+    XLU_ConfigSetting *set;
+    char *endptr;
+    long l;
+
+    set = find(cfg, n);
+    if (set == NULL)
+        return XLU_CFG_NOTFOUND;
+    if (set->avalues > 1)
+        return XLU_CFG_LIST;
+    errno = 0;
+    l = strtol(set->values[0], &endptr, 0);
+    if (errno == EINVAL || endptr == set->values[0])
+        return XLU_CFG_STRING;
+    return XLU_CFG_LONG;
+}
+
 static int find_atom(const XLU_Config *cfg, const char *n,
                      XLU_ConfigSetting **set_r) {
     XLU_ConfigSetting *set;
diff --git a/tools/libxl/libxlutil.h b/tools/libxl/libxlutil.h
index 0262e55..0d7ae91 100644
--- a/tools/libxl/libxlutil.h
+++ b/tools/libxl/libxlutil.h
@@ -24,6 +24,11 @@
 typedef struct XLU_Config XLU_Config;
 typedef struct XLU_ConfigList XLU_ConfigList;
 
+#define XLU_CFG_NOTFOUND 0
+#define XLU_CFG_LIST     1
+#define XLU_CFG_LONG     2
+#define XLU_CFG_STRING   3
+
 XLU_Config *xlu_cfg_init(FILE *report, const char *report_filename);
   /* 0 means we got ENOMEM. */
   /* report_filename is copied; report is saved and must remain valid
@@ -45,6 +50,7 @@ void xlu_cfg_destroy(XLU_Config*);
  *   ERANGE   value out of range (from strtol)
  */
 
+int xlu_cfg_get_type(const XLU_Config *cfg, const char *n);
 int xlu_cfg_get_string(const XLU_Config*, const char *n, const char **value_r);
 int xlu_cfg_get_long(const XLU_Config*, const char *n, long *value_r);
 
-- 
1.6.4


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