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/*
* An implementation of expandable c strings in heap memory.
* Copyright (C) 2015 Michael Goehler
*
* This file is part of mdp.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <wchar.h> // wcslen, wcscat, wmemmove
#include <stdio.h> // fprintf
#include <stdlib.h> // malloc, realloc
#include "cstring.h"
cstring_t *cstring_init() {
cstring_t *x = NULL;
if((x = malloc(sizeof(cstring_t))) != NULL) {
x->value = NULL;
x->size = x->alloc = 0;
x->expand = cstring_expand;
x->expand_arr = cstring_expand_arr;
x->strip = cstring_strip;
x->reset = cstring_reset;
x->delete = cstring_delete;
} else {
fprintf(stderr, "%s\n", "cstring_init() failed to allocate memory.");
exit(EXIT_FAILURE);
}
return x;
}
void cstring_expand(cstring_t *self, wchar_t x) {
if((self->size + 2) * sizeof(wchar_t) > self->alloc) {
self->alloc += (REALLOC_ADD * sizeof(wchar_t));
if((self->value = realloc(self->value, self->alloc)) == NULL) {
fprintf(stderr, "%s\n", "cstring_expand() failed to reallocate memory.");
exit(EXIT_FAILURE);
}
}
self->value[self->size] = x;
self->value[self->size+1] = L'\0';
self->size = wcslen(self->value);
}
void cstring_expand_arr(cstring_t *self, wchar_t *x) {
if((self->size + wcslen(x) + 1) * sizeof(wchar_t) > self->alloc) {
self->alloc = ((self->size + wcslen(x) + 1) * sizeof(wchar_t));
if((self->value = realloc(self->value, self->alloc)) == NULL) {
fprintf(stderr, "%s\n", "cstring_expand_arr() failed to reallocate memory.");
exit(EXIT_FAILURE);
}
}
self->value = wcscat(self->value, x);
self->size = wcslen(self->value);
self->value[self->size+1] = L'\0';
}
void cstring_strip(cstring_t *self, int pos, int len) {
if(pos + len >= self->size) {
if(pos <= self->size) {
self->value[pos] = L'\0';
self->size = pos;
}
return;
}
wmemmove(&self->value[pos], &self->value[pos+len], self->size - pos - len+1);
self->size -= len;
}
void cstring_reset(cstring_t *self) {
free(self->value);
self->value = NULL;
self->size = self->alloc = 0;
}
void cstring_delete(cstring_t *self) {
free(self->value);
free(self);
}
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