Port to CMake, get rid of os_int.h.

[stg.git] / libs / smux / constraints.c

diff --git a/libs/smux/constraints.c b/libs/smux/constraints.c
new file mode 100644 (file)
index 0000000..1bdda73
--- /dev/null
+++ b/libs/smux/constraints.c
@@ -0,0 +1,93 @@
+#include "asn_internal.h"
+#include "constraints.h"
+
+int
+asn_generic_no_constraint(asn_TYPE_descriptor_t *type_descriptor,
+       const void *struct_ptr, asn_app_constraint_failed_f *cb, void *key) {
+
+       (void)type_descriptor;  /* Unused argument */
+       (void)struct_ptr;       /* Unused argument */
+       (void)cb;       /* Unused argument */
+       (void)key;      /* Unused argument */
+
+       /* Nothing to check */
+       return 0;
+}
+
+int
+asn_generic_unknown_constraint(asn_TYPE_descriptor_t *type_descriptor,
+       const void *struct_ptr, asn_app_constraint_failed_f *cb, void *key) {
+
+       (void)type_descriptor;  /* Unused argument */
+       (void)struct_ptr;       /* Unused argument */
+       (void)cb;       /* Unused argument */
+       (void)key;      /* Unused argument */
+
+       /* Unknown how to check */
+       return 0;
+}
+
+struct errbufDesc {
+       asn_TYPE_descriptor_t *failed_type;
+       const void *failed_struct_ptr;
+       char *errbuf;
+       size_t errlen;
+};
+
+static void
+_asn_i_ctfailcb(void *key, asn_TYPE_descriptor_t *td, const void *sptr, const char *fmt, ...) {
+       struct errbufDesc *arg = key;
+       va_list ap;
+       ssize_t vlen;
+       ssize_t maxlen;
+
+       arg->failed_type = td;
+       arg->failed_struct_ptr = sptr;
+
+       maxlen = arg->errlen;
+       if(maxlen <= 0)
+               return;
+
+       va_start(ap, fmt);
+       vlen = vsnprintf(arg->errbuf, maxlen, fmt, ap);
+       va_end(ap);
+       if(vlen >= maxlen) {
+               arg->errbuf[maxlen-1] = '\0';   /* Ensuring libc correctness */
+               arg->errlen = maxlen - 1;       /* Not counting termination */
+               return;
+       } else if(vlen >= 0) {
+               arg->errbuf[vlen] = '\0';       /* Ensuring libc correctness */
+               arg->errlen = vlen;             /* Not counting termination */
+       } else {
+               /*
+                * The libc on this system is broken.
+                */
+               vlen = sizeof("<broken vsnprintf>") - 1;
+               maxlen--;
+               arg->errlen = vlen < maxlen ? vlen : maxlen;
+               memcpy(arg->errbuf, "<broken vsnprintf>", arg->errlen);
+               arg->errbuf[arg->errlen] = 0;
+       }
+
+       return;
+}
+
+int
+asn_check_constraints(asn_TYPE_descriptor_t *type_descriptor,
+               const void *struct_ptr, char *errbuf, size_t *errlen) {
+       struct errbufDesc arg;
+       int ret;
+
+       arg.failed_type = 0;
+       arg.failed_struct_ptr = 0;
+       arg.errbuf = errbuf;
+       arg.errlen = errlen ? *errlen : 0;
+
+       ret = type_descriptor->check_constraints(type_descriptor,
+               struct_ptr, _asn_i_ctfailcb, &arg);
+       if(ret == -1 && errlen)
+               *errlen = arg.errlen;
+
+       return ret;
+}
+