[libvirt] [PATCH 1/2] virsh.c: new xPathULong() to parse XML returning ulong value of selected node.

Parse XML from given buffer, select appropiate XPath node and return its value as unsigned long. --- tools/virsh.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 49 insertions(+), 0 deletions(-) diff --git a/tools/virsh.c b/tools/virsh.c index 50d5e33..8804fc3 100644 --- a/tools/virsh.c +++ b/tools/virsh.c @@ -2270,6 +2270,55 @@ static const vshCmdInfo info_freecell[] = { {NULL, NULL} }; +static int +xPathULong(char *xml, char *xpath, unsigned long *value) { + + xmlDocPtr doc = NULL; + xmlXPathContextPtr ctxt = NULL; + xmlXPathObjectPtr obj = NULL; + int ret = -1; + + doc = xmlReadDoc((const xmlChar *) xml, "domain.xml", NULL, + XML_PARSE_NOENT | XML_PARSE_NONET | XML_PARSE_NOWARNING); + if (!doc) + goto cleanup; + + ctxt = xmlXPathNewContext(doc); + if (!ctxt) + goto cleanup; + + obj = xmlXPathEval(BAD_CAST xpath, ctxt); + if (!obj) + goto cleanup; + + if (!value) + goto cleanup; + + *value = 0; + if ((obj->type == XPATH_STRING) && + (obj->stringval != NULL) && (obj->stringval[0] != 0)) { + char *conv = NULL; + unsigned long val; + + val = strtoul((const char *) obj->stringval, &conv, 10); + if (*conv =='\0') { + *value = val; + ret = 0; + } + } else if ((obj != NULL) && (obj->type == XPATH_NUMBER)) { + *value = (unsigned long) obj->floatval; + if (*value == obj->floatval) { + ret = 0; + } + } + +cleanup: + xmlXPathFreeObject(obj); + xmlXPathFreeContext(ctxt); + xmlFreeDoc(doc); + return ret; +} + static const vshCmdOptDef opts_freecell[] = { {"cellno", VSH_OT_INT, 0, N_("NUMA cell number")}, {"all", VSH_OT_BOOL, 0, N_("show free memory for all NUMA cells")}, -- 1.7.3.5