text_buf.h

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#pragma once
 
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
 
#ifdef __cplusplus
extern "C" {
#endif

#define TEXT_BUF_FILE_MAX 1048576u
#define TEXT_BUF_ENDS_MAX 65536u
#define TEXT_BUF_PROBE 4096u
#define TEXT_BUF_TAB 8u
#define TEXT_BUF_BOM_LEN 3u

typedef enum {
    TEXT_BUF_OK = 0,         
    TEXT_BUF_ARG = 1,        
    TEXT_BUF_TOO_LARGE = 2,  
    TEXT_BUF_TOO_MANY = 3,   
    TEXT_BUF_NOT_TEXT = 4,   
    TEXT_BUF_FULL = 5,       
} text_buf_err_t;

typedef enum {
    TEXT_EOL_LF = 0,    
    TEXT_EOL_CRLF = 1,  
    TEXT_EOL_CR = 2,    
    TEXT_EOL_KINDS = 3  
} text_eol_t;

typedef struct {
    uint8_t *mem;        
    size_t cap;          
    uint32_t *ends;      
    size_t ends_cap;     
    size_t n_ends;       
    size_t gap_at;       
    size_t gap_len;      
    size_t len;          
    size_t limit;        
    size_t cursor;       
    size_t kinds[TEXT_EOL_KINDS]; 
    text_eol_t eol;      
    uint32_t revision;   
    bool bom;            
    bool dirty;          
} text_buf_t;

text_buf_err_t text_buf_init(text_buf_t *tb, uint8_t *mem, size_t cap,
                             uint32_t *ends, size_t ends_cap);

size_t text_buf_room(const text_buf_t *tb);

uint8_t *text_buf_load_area(text_buf_t *tb);

text_buf_err_t text_buf_load_done(text_buf_t *tb, size_t len);

text_buf_err_t text_buf_load(text_buf_t *tb, const void *bytes, size_t len);

size_t text_buf_size(const text_buf_t *tb);

size_t text_buf_read(const text_buf_t *tb, size_t at, void *out, size_t n);

size_t text_buf_len(const text_buf_t *tb);

uint8_t text_buf_byte(const text_buf_t *tb, size_t pos);

size_t text_buf_lines(const text_buf_t *tb);

size_t text_buf_line_start(const text_buf_t *tb, size_t line);

size_t text_buf_line_len(const text_buf_t *tb, size_t line);

const char *text_buf_line(text_buf_t *tb, size_t line, size_t *len);

size_t text_buf_line_of(const text_buf_t *tb, size_t pos);

uint32_t text_buf_cp(const text_buf_t *tb, size_t pos, size_t *bytes);

size_t text_buf_next(const text_buf_t *tb, size_t pos);

size_t text_buf_prev(const text_buf_t *tb, size_t pos);

bool text_buf_is_unit(const text_buf_t *tb, size_t pos);

size_t text_buf_rows(const text_buf_t *tb, size_t line, unsigned width);

void text_buf_cell_of(const text_buf_t *tb, size_t pos, unsigned width,
                      size_t *line, size_t *cell);

size_t text_buf_pos_at(const text_buf_t *tb, size_t line, size_t cell,
                       unsigned width);

size_t text_buf_cursor(const text_buf_t *tb);

void text_buf_set_cursor(text_buf_t *tb, size_t pos);

bool text_buf_left(text_buf_t *tb);

bool text_buf_right(text_buf_t *tb);

text_buf_err_t text_buf_insert(text_buf_t *tb, uint32_t cp);

text_buf_err_t text_buf_insert_eol(text_buf_t *tb);

bool text_buf_delete_before(text_buf_t *tb);

bool text_buf_delete_after(text_buf_t *tb);

text_eol_t text_buf_eol(const text_buf_t *tb);

bool text_buf_mixed(const text_buf_t *tb);

bool text_buf_bom(const text_buf_t *tb);

bool text_buf_dirty(const text_buf_t *tb);

void text_buf_saved(text_buf_t *tb);

uint32_t text_buf_revision(const text_buf_t *tb);
 
#ifdef __cplusplus
}
#endif