kmx.io/git-auth/symtable.c

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• Hash : aadf5635
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  Date : 2012-04-20T05:44:45
  

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• symtable.c

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  /*
   * git-auth  -  restrict git commands
   * Copyright 2012 Thomas de Grivel <billitch@gmail.com>
   *
   * 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.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <assert.h>
  #include <string.h>
  #include <err.h>
  
  #include "symtable.h"
  
  void symtable_init (s_symtable *st)
  {
    assert(st);
    st->count = 0;
    st->size = 128;
    if (!(st->sym = calloc(st->size, sizeof(t_sym))))
      err(10, "symtable_init calloc");
  }
  
  s_symtable * symtable_copy (s_symtable *dest, s_symtable *st)
  {
    assert(dest);
    assert(st);
    dest->count = st->count;
    dest->size = st->size;
    if (!(dest->sym = calloc(dest->size, sizeof(t_sym))))
      err(10, "symtable_copy calloc");
    return dest;
  }
  
  void symtable_free (s_symtable *st)
  {
    assert(st);
    free(st->sym);
    bzero(st, sizeof(s_symtable));
  }
  
  void symtable_free_all (s_symtable *st)
  {
    assert(st);
    int i = st->count;
    while (i--)
      free((void*)st->sym[i]);
    free(st->sym);
    bzero(st, sizeof(s_symtable));
  }
  
  void symtable_enlarge (s_symtable *st)
  {
    assert(st);
    st->size += st->size < 1024 ? st->size : 1024;
    if (!(st->sym = realloc(st->sym, st->size)))
      err(10, "symtable realloc");
    assert(st->size > st->count);
  }
  
  t_sym symtable_find (s_symtable *st, const char *string)
  {
    assert(st);
    t_sym *s = st->sym;
    int i = st->count;
    while (i--) {
      if ((*s == string) || (string && !strcmp(string, *s)))
        return *s;
      s++;
    }
    return NULL;
  }
  
  int strcmp_n (const char *a, const char *b, size_t len_b)
  {
    const unsigned char *aa = (const unsigned char *) a;
    const unsigned char *bb = (const unsigned char *) b;
    while (len_b && *aa == *bb && *aa) {
      aa++;
      bb++;
      len_b--;
    }
    if ((!*aa && !len_b) || (*aa == *bb))
      return 0;
    if (!*aa || *aa < *bb)
      return -1;
    return 1;
  }
  
  t_sym symtable_find_n (s_symtable *st, const char *string, size_t len)
  {
    assert(st);
    t_sym *s = st->sym;
    int i = st->count;
    while (i--) {
      if (*s == string || (string && len && !strcmp_n(*s, string, len)))
        return *s;
      s++;
    }
    return NULL;
  }
  
  t_sym symtable_add (s_symtable *st, t_sym sym)
  {
    assert(st);
    if (st->count == st->size)
      symtable_enlarge(st);
    return st->sym[st->count++] = sym;
  }
  
  t_sym symtable_intern (s_symtable *st, const char *string)
  {
    t_sym s = symtable_find(st, string);
    if (!s)
      s = symtable_add(st, string);
    return s;
  }
  

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