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authorAlon Levy <alevy@redhat.com>2013-03-04 18:41:28 +0200
committerAlon Levy <alevy@redhat.com>2013-04-24 11:47:57 +0300
commitb16352acf3105000e14f194b556e159d5d06cff9 (patch)
tree71596d7b7e1a6167849263e5861fc136407064b8 /util/cutils.c
parent0e61400c1941aabc9f45d5ff961b57337c7caac6 (diff)
ccid-card-passthru, dev-smartcard-reader: add debug environment variables
Introduces a new utility function: parse_debug_env to avoid code duplication. This overrides whatever debug value is set on the corresponding devices from the command line, and is meant to ease the usage with any management stack. For libvirt you can set environment variables by extending the dom namespace, i.e: <domain type='kvm' id='3' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'> <qemu:commandline> <qemu:env name='QEMU_CCID_PASSTHRU_DEBUG' value='4'/> <qemu:env name='QEMU_CCID_DEBUG' value='4'/> </qemu:commandline> </domain> Signed-off-by: Alon Levy <alevy@redhat.com> Reviewed-by: Marc-André Lureau <mlureau@redhat.com>
Diffstat (limited to 'util/cutils.c')
-rw-r--r--util/cutils.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/util/cutils.c b/util/cutils.c
index 5024253405..a1658197cf 100644
--- a/util/cutils.c
+++ b/util/cutils.c
@@ -482,3 +482,26 @@ int uleb128_decode_small(const uint8_t *in, uint32_t *n)
return 2;
}
}
+
+/*
+ * helper to parse debug environment variables
+ */
+int parse_debug_env(const char *name, int max, int initial)
+{
+ char *debug_env = getenv(name);
+ char *inv = NULL;
+ int debug;
+
+ if (!debug_env) {
+ return initial;
+ }
+ debug = strtol(debug_env, &inv, 10);
+ if (inv == debug_env) {
+ return initial;
+ }
+ if (debug < 0 || debug > max) {
+ fprintf(stderr, "warning: %s not in [0, %d]", name, max);
+ return initial;
+ }
+ return debug;
+}