93 lines
2.0 KiB
C
93 lines
2.0 KiB
C
/*
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* $Id: token.c,v 1.1 2005-02-04 15:39:11 bacon Exp $
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*/
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#include "token.h"
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#include <stdlib.h>
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xp_lisp_token_t* xp_lisp_token_new (xp_size_t capacity)
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{
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xp_lisp_token_t* token;
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xp_lisp_assert (capacity > 0);
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token = (xp_lisp_token_t*)malloc (sizeof(xp_lisp_token_t));
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if (token == XP_NULL) return XP_NULL;
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token->buffer = (xp_lisp_char*)malloc ((capacity + 1) * sizeof(xp_lisp_char));
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if (token->buffer == XP_NULL) {
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free (token);
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return XP_NULL;
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}
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token->ivalue = 0;
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token->fvalue = .0;
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token->size = 0;
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token->capacity = capacity;
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token->buffer[0] = RBL_CHAR('\0');
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return token;
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}
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void xp_lisp_token_free (xp_lisp_token_t* token)
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{
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free (token->buffer);
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free (token);
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}
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int xp_lisp_token_addc (xp_lisp_token_t* token, xp_lisp_cint c)
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{
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if (token->size >= token->capacity) {
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// double the capacity.
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xp_lisp_char* new_buffer = (xp_lisp_char*)realloc (
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token->buffer, (token->capacity * 2 + 1) * sizeof(xp_lisp_char));
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if (new_buffer == XP_NULL) return -1;
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token->buffer = new_buffer;
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token->capacity = token->capacity * 2;
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}
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token->buffer[token->size++] = c;
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token->buffer[token->size] = RBL_CHAR('\0');
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return 0;
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}
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void xp_lisp_token_clear (xp_lisp_token_t* token)
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{
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token->ivalue = 0;
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token->fvalue = .0;
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token->size = 0;
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token->buffer[0] = RBL_CHAR('\0');
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}
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xp_lisp_char* xp_lisp_token_transfer (xp_lisp_token_t* token, xp_size_t capacity)
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{
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xp_lisp_char* old_buffer, * new_buffer;
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new_buffer = (xp_lisp_char*)malloc((capacity + 1) * sizeof(xp_lisp_char));
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if (new_buffer == XP_NULL) return XP_NULL;
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old_buffer = token->buffer;
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token->buffer = new_buffer;
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token->size = 0;
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token->capacity = capacity;
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token->buffer[0] = RBL_CHAR('\0');
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return old_buffer;
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}
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int xp_lisp_token_compare (xp_lisp_token_t* token, const xp_lisp_char* str)
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{
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xp_lisp_char* p = token->buffer;
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xp_size_t index = 0;
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while (index < token->size) {
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if (*p > *str) return 1;
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if (*p < *str) return -1;
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index++; p++; str++;
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}
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return (*str == RBL_CHAR('\0'))? 0: -1;
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}
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