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tlv11.c

/*
 * Copyright (C) 2008 Stig Venaas <venaas@uninett.no>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 */

#ifdef SYS_SOLARIS9
#include <sys/inttypes.h>
#else
#include <stdint.h>
#endif
#include "list.h"
#include "tlv11.h"
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>

struct tlv *maketlv(uint8_t t, uint8_t l, void *v) {
    struct tlv *tlv;

    tlv = malloc(sizeof(struct tlv));
    if (!tlv)
      return NULL;
    tlv->t = t;
    tlv->l = l;
    if (l && v) {
      tlv->v = malloc(l);
      if (!tlv->v) {
          free(tlv);
          return NULL;
      }
      memcpy(tlv->v, v, l);
    } else
      tlv->v = NULL;
    return tlv;
}

struct tlv *copytlv(struct tlv *in) {
    return in ? maketlv(in->t, in->l, in->v) : NULL;
}

void freetlv(struct tlv *tlv) {
    if (tlv) {
      free(tlv->v);
      free(tlv);
    }
}

int eqtlv(struct tlv *t1, struct tlv *t2) {
    if (!t1 || !t2)
      return t1 == t2;
    if (t1->t != t2->t || t1->l != t2->l)
      return 0;
    return memcmp(t1->v, t2->v, t1->l) == 0;
}

struct list *copytlvlist(struct list *tlvs) {
    struct list *out;
    struct list_node *node;

    if (!tlvs)
      return NULL;
    out = list_create();
    if (!out)
      return NULL;
    for (node = list_first(tlvs); node; node = list_next(node)) {
      if (!list_push(out, copytlv((struct tlv *)node->data))) {
          freetlvlist(out);
          return NULL;
      }
    }
    return out;
}

void freetlvlist(struct list *tlvs) {
    struct tlv *tlv;
    while ((tlv = (struct tlv *)list_shift(tlvs)))
      freetlv(tlv);
    list_destroy(tlvs);
}

void rmtlv(struct list *tlvs, uint8_t t) {
    struct list_node *n, *p;
    struct tlv *tlv;

    p = NULL;
    n = list_first(tlvs);
    while (n) {
      tlv = (struct tlv *)n->data;
      if (tlv->t == t) {
          list_removedata(tlvs, tlv);
          freetlv(tlv);
          n = p ? list_next(p) : list_first(tlvs);
      } else {
          p = n;
          n = list_next(n);
      }
    }
}

uint8_t *tlv2str(struct tlv *tlv) {
    uint8_t *s = malloc(tlv->l + 1);
    if (s) {
      memcpy(s, tlv->v, tlv->l);
      s[tlv->l] = '\0';
    }
    return s;
}

uint8_t *tlv2buf(uint8_t *p, const struct tlv *tlv) {
    *p++ = tlv->t;
    *p++ = tlv->l;
    if (tlv->l) {
      if (tlv->v)
          memcpy(p, tlv->v, tlv->l);
      else
          memset(p, 0, tlv->l);
    }
    return p;
}

/* Local Variables: */
/* c-file-style: "stroustrup" */
/* End: */

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