ref: 4bb6966550b52cff7a3e2633141ebae5ceb3f12a
dir: /field.c/
#include "field.h"
#include <ctype.h>
void field_init(Field* f) {
f->buffer = NULL;
f->height = 0;
f->width = 0;
}
void field_init_fill(Field* f, U32 height, U32 width, Term fill_char) {
size_t num_cells = height * width;
f->buffer = malloc(num_cells * sizeof(Term));
memset(f->buffer, fill_char, num_cells);
f->height = height;
f->width = width;
}
void field_resize_raw(Field* f, U32 height, U32 width) {
size_t cells = height * width;
f->buffer = realloc(f->buffer, cells * sizeof(Term));
f->height = height;
f->width = width;
}
void field_deinit(Field* f) { free(f->buffer); }
void field_copy_subrect(Field* src, Field* dest, U32 src_y, U32 src_x,
U32 dest_y, U32 dest_x, U32 height, U32 width) {
size_t src_height = src->height;
size_t src_width = src->width;
size_t dest_height = dest->height;
size_t dest_width = dest->width;
if (src_height <= src_y || src_width <= src_x || dest_height <= dest_y ||
dest_width <= dest_x)
return;
size_t ny_0 = src_height - src_y;
size_t ny_1 = dest_height - dest_y;
size_t ny = height;
if (ny_0 < ny)
ny = ny_0;
if (ny_1 < ny)
ny = ny_1;
if (ny == 0)
return;
size_t row_copy_0 = src_width - src_x;
size_t row_copy_1 = dest_width - dest_x;
size_t row_copy = width;
if (row_copy_0 < row_copy)
row_copy = row_copy_0;
if (row_copy_1 < row_copy)
row_copy = row_copy_1;
size_t copy_bytes = row_copy * sizeof(Term);
Term* src_p = src->buffer + src_y * src_width + src_x;
Term* dest_p = dest->buffer + dest_y * dest_width + dest_x;
size_t src_stride;
size_t dest_stride;
if (src_y >= dest_y) {
src_stride = src_width;
dest_stride = dest_width;
} else {
src_p += (ny - 1) * src_width;
dest_p += (ny - 1) * dest_width;
src_stride = -src_width;
dest_stride = -dest_width;
}
size_t iy = 0;
for (;;) {
memmove(dest_p, src_p, copy_bytes);
++iy;
if (iy == ny)
break;
src_p += src_stride;
dest_p += dest_stride;
}
}
void field_fill_subrect(Field* f, U32 y, U32 x, U32 height, U32 width,
Term fill_char) {
size_t f_height = f->height;
size_t f_width = f->width;
if (y >= f_height || x >= f_width)
return;
size_t rows_0 = f_height - y;
size_t rows = height;
if (rows_0 < rows)
rows = rows_0;
if (rows == 0)
return;
size_t columns_0 = f_width - x;
size_t columns = width;
if (columns_0 < columns)
columns = columns_0;
size_t fill_bytes = columns * sizeof(Term);
Term* p = f->buffer + y * f_width + x;
size_t iy = 0;
for (;;) {
memset(p, fill_char, fill_bytes);
++iy;
if (iy == rows)
break;
p += f_width;
}
}
Term field_peek(Field* f, U32 y, U32 x) {
size_t f_height = f->height;
size_t f_width = f->width;
assert(y < f_height && x < f_width);
if (y >= f_height || x >= f_width)
return '\0';
return f->buffer[y * f_width + x];
}
void field_poke(Field* f, U32 y, U32 x, Term term) {
size_t f_height = f->height;
size_t f_width = f->width;
assert(y < f_height && x < f_width);
if (y >= f_height || x >= f_width)
return;
f->buffer[y * f_width + x] = term;
}
inline bool term_char_is_valid(char c) {
return c >= '#' && c <= '~';
}
void field_fput(Field* f, FILE* stream) {
enum { Column_buffer_count = 4096 };
char out_buffer[Column_buffer_count];
size_t f_height = f->height;
size_t f_width = f->width;
Term* f_buffer = f->buffer;
if (f_width > Column_buffer_count - 2)
return;
for (size_t iy = 0; iy < f_height; ++iy) {
Term* row_p = f_buffer + f_width * iy;
for (size_t ix = 0; ix < f_width; ++ix) {
char c = row_p[ix];
out_buffer[ix] = term_char_is_valid(c) ? c : '!';
}
out_buffer[f_width] = '\n';
out_buffer[f_width + 1] = '\0';
fputs(out_buffer, stream);
}
}
Field_load_error field_load_file(char const* filepath, Field* field) {
FILE* file = fopen(filepath, "r");
if (file == NULL) {
return Field_load_error_cant_open_file;
}
enum { Bufsize = 4096 };
char buf[Bufsize];
U32 first_row_columns = 0;
U32 rows = 0;
for (;;) {
char* s = fgets(buf, Bufsize, file);
if (s == NULL)
break;
size_t len = strlen(buf);
if (len == Bufsize - 1 && buf[len - 1] != '\n' && !feof(file)) {
fclose(file);
return Field_load_error_too_many_columns;
}
for (;;) {
if (len == 0)
break;
if (!isspace(buf[len - 1]))
break;
--len;
}
if (len == 0)
continue;
// quick hack until we use a proper scanner
if (rows == 0) {
first_row_columns = len;
} else if (len != first_row_columns) {
fclose(file);
return Field_load_error_not_a_rectangle;
}
field_resize_raw(field, rows + 1, first_row_columns);
Term* rowbuff = field->buffer + first_row_columns * rows;
for (size_t i = 0; i < len; ++i) {
char c = buf[i];
rowbuff[i] = term_char_is_valid(c) ? c : '!';
}
++rows;
}
fclose(file);
return Field_load_error_ok;
}