rtbuf/rtbuf/symbol.c

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• Hash : 95901a6d
  Author : Thomas de Grivel
  Date : 2018-08-03T13:09:28
  

  Add copyright and ISC license
  

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• symbol.c

• /*
   * Copyright 2018 Thomas de Grivel <thoxdg@gmail.com> +33614550127
   *
   * 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 <stdio.h>
  #include <string.h>
  #include <strings.h>
  #include "symbol.h"
  
  char         g_string[STRING_MAX];
  unsigned int g_string_n = 0;
  
  const char  *g_symbols[SYMBOL_MAX];
  unsigned int g_symbols_n = 0;
  
  void symbols_init () {
    bzero(g_string, sizeof(g_string));
    bzero(g_symbols, sizeof(g_symbols));
  }
  
  symbol symbol_new (const char *name)
  {
    unsigned int i = 0;
    if (g_symbols_n == SYMBOL_MAX) {
      fprintf(stderr, "maximum number of symbols exceeded\n");
      return 0;
    }
    while (i < SYMBOL_MAX) {
      if (g_symbols[i] == 0) {
        const char *in = name;
        char *out = &g_string[g_string_n];
        g_symbols[i] = out;
        while (*in) {
          *out++ = *in++;
          g_string_n++;
        }
        *out = 0;
        g_string_n++;
        g_symbols_n++;
        return g_symbols[i];
      }
      i++;
    }
    return 0;
  }
  
  symbol symbol_find (const char *name)
  {
    unsigned int i = 0;
    unsigned int n = g_symbols_n;
    while (i < SYMBOL_MAX && n > 0) {
      if (g_symbols[i]) {
        if (name == g_symbols[i] ||
            strcmp(name, g_symbols[i]) == 0)
          return g_symbols[i];
        n--;
      }
      i++;
    }
    return 0;
  }
  
  symbol symbol_intern (const char *name)
  {
    symbol sym = symbol_find(name);
    if (sym == 0)
      sym = symbol_new(name);
    return sym;
  }
  

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