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#define _POSIX_C_SOURCE 200112L
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "gramscii.h"
/** extern declarations **/
extern lineset_t screen; /* what is visualised */
extern lineset_t cutbuf; /* cut/paste buffer */
extern lineset_t *undo; /* undo list */
extern int undo_sz;/* allocated size of undo list*/
extern int undo_cur;/* undo position */
extern int undo_lst;/* last valid undo position */
extern int WIDTH, HEIGHT;
extern char modified; /* set to 1 if screen modified since last save */
/****/
static int LONG_STEP;
/* line_t and lineset_t management */
void ensure_line_length(line_t *l, int len){
char *tmp;
if (l->sz < len + 1){
tmp = realloc(l->s, (len+1) * 2 * sizeof(char));
if (tmp == NULL){
fprintf(stderr, "Unable to allocate string\n");
cleanup(1);
}
l->s = tmp;
l->sz = (len + 1) * 2;
}
}
void alloc_line(line_t *l){
char *tmp;
l->sz = WIDTH+1;
tmp = malloc((l->sz) * sizeof(char));
if (tmp == NULL){
fprintf(stderr, "unable to allocate line\n");
cleanup(1);
}
l->s = tmp;
memset(l->s, BG, l->sz);
l->lst = -1;
l->s[0]='\0';
}
void ensure_num_lines(lineset_t *ls, int n){
line_t *tmp;
if (n > ls->sz){
if (ls->sz == 0)
ls->l=NULL;
tmp = realloc(ls->l, (n + LONG_STEP) * sizeof(line_t));
if (tmp == NULL){
fprintf(stderr, "Unable to allocate memory for more lines");
cleanup(1);
}
else {
ls->l = tmp;
while ( ls->sz < n + LONG_STEP){
alloc_line(&(ls->l[ls->sz]));
ls->sz ++;
}
}
}
}
void dump_lines(lineset_t ls, FILE *f){
int i;
for (i=0; i<ls.num ;i++){
fprintf(f, "%s\n", ls.l[i].s);
}
fflush(f);
}
void pad_line_to_length(char *s, int W){
int i;
for (i=strlen(s); i<W; i++){
s[i] = BG;
}
}
/* cut/yank/paste/undo management */
void yank_region(int x1, int y1, int x2, int y2){
int N, W, i;
N = y2 - y1 + 1;
W = x2 - x1 + 1;
ensure_num_lines(&cutbuf, N);
for (i=y1; i<=y2; i++){
ensure_line_length(&(cutbuf.l[i-y1]), W);
memcpy(cutbuf.l[i-y1].s, screen.l[i].s + x1, x2-x1+1);
if (strlen(cutbuf.l[i-y1].s) < W)
pad_line_to_length(cutbuf.l[i-y1].s, W);
cutbuf.l[i-y1].s[W] = '\0';
cutbuf.l[i-y1].n = i;
}
cutbuf.num = N;
#ifdef DEBUG
dump_lines(cutbuf, stderr);
#endif
}
void paste_region(int x1, int y1){
int i, curlen, pastelen;
i = y1;
while( i < HEIGHT && i < y1 + cutbuf.num){
pastelen = strlen(cutbuf.l[i-y1].s);
curlen = strlen(screen.l[i].s);
memcpy(screen.l[i].s + x1, cutbuf.l[i-y1].s, pastelen);
if (curlen <= x1)
/* double-check this line below */
pad_line_to_length(screen.l[i].s + curlen, x1 - curlen);
if (curlen <= x1 + pastelen)
screen.l[i].s[x1 + pastelen] = '\0';
screen.l[i].lst = strlen(screen.l[i].s) - 1;
#ifdef DEBUG
fprintf(stderr, "%d.lst: %d\n", i, screen.l[i].lst);
#endif
i += 1;
modified = 1;
}
redraw();
}
void copy_lines_to_ring(int y1, int y2, int which){
int i, len, idx;
lineset_t *tmp;
if (y1 > y2){
y1 ^= y2;
y2 ^= y1;
y1 ^= y2;
}
if (undo_cur > undo_lst)
undo_cur = undo_lst;
if (which == PRV_STATE){ /* adding a new previous state */
undo_cur += 2;
idx = undo_cur;
}
else
idx = undo_cur + 1;
if (idx >= undo_sz - 1){
tmp = realloc(undo, (undo_sz + 10) * sizeof(lineset_t));
if (tmp == NULL){
fprintf(stderr, "Error allocating undo buffer");
cleanup(1);
}
undo = tmp;
for (i=0; i<10; i++){
undo[undo_sz + i].sz = 0;
undo[undo_sz + i].l = NULL;
undo[undo_sz + i].num = 0;
}
undo_sz += 10;
}
ensure_num_lines(&(undo[idx]), y2 - y1 + 1);
for(i=y1; i<=y2; i++){
len = strlen(screen.l[i].s);
ensure_line_length(&(undo[idx].l[i-y1]), len);
strcpy(undo[idx].l[i-y1].s, screen.l[i].s);
undo[idx].l[i-y1].n = i;
undo[idx].l[i-y1].lst = screen.l[i].lst;
}
undo[idx].num = y2 - y1 + 1;
if (which == PRV_STATE)
undo_lst = undo_cur;
#ifdef DEBUG
fprintf(stderr, "undo_ring: y1: %d y2: %d idx: %d\n", y1, y2, idx);
for(i=0; i<undo[idx].num; i++){
fprintf(stderr, "UU: %d| %s\n", undo[idx].l[i].n, undo[idx].l[i].s);
}
#endif
}
void invalidate_undo(){
if (undo_lst > undo_cur)
undo_lst = undo_cur;
}
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