94 lines
2.4 KiB
C
94 lines
2.4 KiB
C
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#include <asn_internal.h>
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#include <constraints.h>
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int
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asn_generic_no_constraint(const asn_TYPE_descriptor_t *type_descriptor,
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const void *struct_ptr,
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asn_app_constraint_failed_f *cb, void *key) {
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(void)type_descriptor; /* Unused argument */
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(void)struct_ptr; /* Unused argument */
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(void)cb; /* Unused argument */
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(void)key; /* Unused argument */
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/* Nothing to check */
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return 0;
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}
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int
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asn_generic_unknown_constraint(const asn_TYPE_descriptor_t *type_descriptor,
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const void *struct_ptr,
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asn_app_constraint_failed_f *cb, void *key) {
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(void)type_descriptor; /* Unused argument */
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(void)struct_ptr; /* Unused argument */
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(void)cb; /* Unused argument */
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(void)key; /* Unused argument */
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/* Unknown how to check */
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return 0;
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}
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struct errbufDesc {
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const asn_TYPE_descriptor_t *failed_type;
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const void *failed_struct_ptr;
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char *errbuf;
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size_t errlen;
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};
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static void
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_asn_i_ctfailcb(void *key, const asn_TYPE_descriptor_t *td, const void *sptr,
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const char *fmt, ...) {
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struct errbufDesc *arg = key;
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va_list ap;
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ssize_t vlen;
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ssize_t maxlen;
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arg->failed_type = td;
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arg->failed_struct_ptr = sptr;
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maxlen = arg->errlen;
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if(maxlen <= 0)
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return;
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va_start(ap, fmt);
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vlen = vsnprintf(arg->errbuf, maxlen, fmt, ap);
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va_end(ap);
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if(vlen >= maxlen) {
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arg->errbuf[maxlen-1] = '\0'; /* Ensuring libc correctness */
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arg->errlen = maxlen - 1; /* Not counting termination */
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return;
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} else if(vlen >= 0) {
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arg->errbuf[vlen] = '\0'; /* Ensuring libc correctness */
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arg->errlen = vlen; /* Not counting termination */
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} else {
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/*
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* The libc on this system is broken.
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*/
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vlen = sizeof("<broken vsnprintf>") - 1;
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maxlen--;
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arg->errlen = vlen < maxlen ? vlen : maxlen;
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memcpy(arg->errbuf, "<broken vsnprintf>", arg->errlen);
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arg->errbuf[arg->errlen] = 0;
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}
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return;
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}
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int
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asn_check_constraints(const asn_TYPE_descriptor_t *type_descriptor,
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const void *struct_ptr, char *errbuf, size_t *errlen) {
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struct errbufDesc arg;
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int ret;
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arg.failed_type = 0;
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arg.failed_struct_ptr = 0;
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arg.errbuf = errbuf;
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arg.errlen = errlen ? *errlen : 0;
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ret = type_descriptor->encoding_constraints.general_constraints(
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type_descriptor, struct_ptr, _asn_i_ctfailcb, &arg);
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if(ret == -1 && errlen) *errlen = arg.errlen;
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return ret;
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}
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