thodg/cgminer/compat/jansson-2.5/src/strbuffer.c

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• Hash : d529a3fd
  Author :
  Date : 2013-10-16T22:02:03
  

  Initial import of jansson-2.5

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• compat/jansson-2.5/src/strbuffer.c

• /*
   * Copyright (c) 2009-2013 Petri Lehtinen <petri@digip.org>
   *
   * Jansson is free software; you can redistribute it and/or modify
   * it under the terms of the MIT license. See LICENSE for details.
   */
  
  #ifndef _GNU_SOURCE
  #define _GNU_SOURCE
  #endif
  
  #include <stdlib.h>
  #include <string.h>
  #include "jansson_private.h"
  #include "strbuffer.h"
  
  #define STRBUFFER_MIN_SIZE  16
  #define STRBUFFER_FACTOR    2
  #define STRBUFFER_SIZE_MAX  ((size_t)-1)
  
  int strbuffer_init(strbuffer_t *strbuff)
  {
      strbuff->size = STRBUFFER_MIN_SIZE;
      strbuff->length = 0;
  
      strbuff->value = jsonp_malloc(strbuff->size);
      if(!strbuff->value)
          return -1;
  
      /* initialize to empty */
      strbuff->value[0] = '\0';
      return 0;
  }
  
  void strbuffer_close(strbuffer_t *strbuff)
  {
      if(strbuff->value)
          jsonp_free(strbuff->value);
  
      strbuff->size = 0;
      strbuff->length = 0;
      strbuff->value = NULL;
  }
  
  void strbuffer_clear(strbuffer_t *strbuff)
  {
      strbuff->length = 0;
      strbuff->value[0] = '\0';
  }
  
  const char *strbuffer_value(const strbuffer_t *strbuff)
  {
      return strbuff->value;
  }
  
  char *strbuffer_steal_value(strbuffer_t *strbuff)
  {
      char *result = strbuff->value;
      strbuff->value = NULL;
      return result;
  }
  
  int strbuffer_append(strbuffer_t *strbuff, const char *string)
  {
      return strbuffer_append_bytes(strbuff, string, strlen(string));
  }
  
  int strbuffer_append_byte(strbuffer_t *strbuff, char byte)
  {
      return strbuffer_append_bytes(strbuff, &byte, 1);
  }
  
  int strbuffer_append_bytes(strbuffer_t *strbuff, const char *data, size_t size)
  {
      if(size >= strbuff->size - strbuff->length)
      {
          size_t new_size;
          char *new_value;
  
          /* avoid integer overflow */
          if (strbuff->size > STRBUFFER_SIZE_MAX / STRBUFFER_FACTOR
              || size > STRBUFFER_SIZE_MAX - 1
              || strbuff->length > STRBUFFER_SIZE_MAX - 1 - size)
              return -1;
  
          new_size = max(strbuff->size * STRBUFFER_FACTOR,
                         strbuff->length + size + 1);
  
          new_value = jsonp_malloc(new_size);
          if(!new_value)
              return -1;
  
          memcpy(new_value, strbuff->value, strbuff->length);
  
          jsonp_free(strbuff->value);
          strbuff->value = new_value;
          strbuff->size = new_size;
      }
  
      memcpy(strbuff->value + strbuff->length, data, size);
      strbuff->length += size;
      strbuff->value[strbuff->length] = '\0';
  
      return 0;
  }
  
  char strbuffer_pop(strbuffer_t *strbuff)
  {
      if(strbuff->length > 0) {
          char c = strbuff->value[--strbuff->length];
          strbuff->value[strbuff->length] = '\0';
          return c;
      }
      else
          return '\0';
  }
  

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