2 * An implementation of expandable c strings in heap memory.
3 * Copyright (C) 2014 Michael Goehler
5 * This file is part of mdp.
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
22 #include <string.h> // strlen, memmove
23 #include <stdio.h> // fprintf
24 #include <stdlib.h> // malloc, realloc
28 cstring_t *cstring_init() {
30 if((x = malloc(sizeof(cstring_t))) != NULL) {
32 x->size = x->alloc = 0;
33 x->expand = cstring_expand;
34 x->expand_arr = cstring_expand_arr;
35 x->strip = cstring_strip;
36 x->reset = cstring_reset;
37 x->delete = cstring_delete;
39 fprintf(stderr, "%s\n", "cstring_init() failed to allocate memory.");
45 void cstring_expand(cstring_t *self, char x) {
46 if(self->size + sizeof(x) + sizeof(char) > self->alloc) {
47 self->alloc += (REALLOC_ADD * sizeof(char));
48 if((self->text = realloc(self->text, self->alloc)) == NULL) {
49 fprintf(stderr, "%s\n", "cstring_expand() failed to reallocate memory.");
53 self->text[self->size] = x;
54 self->text[self->size+1] = '\0';
55 self->size = strlen(self->text);
58 void cstring_expand_arr(cstring_t *self, char *x) {
59 if(self->size + strlen(x) + sizeof(char) > self->alloc) {
60 self->alloc = ((strlen(x) + self->size + 1) * sizeof(char));
61 if((self->text = realloc(self->text, self->alloc)) == NULL) {
62 fprintf(stderr, "%s\n", "cstring_expand() failed to reallocate memory.");
66 self->text = strcat(self->text, x);
67 self->size = strlen(self->text);
68 self->text[self->size+1] = '\0';
71 void cstring_strip(cstring_t *self, int pos, int len) {
72 if(pos + len >= self->size) {
73 if(pos <= self->size) {
74 self->text[pos] = '\0';
79 memmove(&self->text[pos], &self->text[pos+len], self->size - pos - len+1);
83 void cstring_reset(cstring_t *self) {
86 self->size = self->alloc = 0;
89 void cstring_delete(cstring_t *self) {