text-internal.h

   1 #ifndef TEXT_INTERNAL
   2 #define TEXT_INTERNAL
   3
   4 #include <stdbool.h>
   5 #include <stddef.h>
   6 #include "text.h"
   7
   8 /* Block holding the file content, either readonly mmap(2)-ed from the original
   9  * file or heap allocated to store the modifications.
  10  */
  11 typedef struct {
  12         size_t size;               /* maximal capacity */
  13         size_t len;                /* current used length / insertion position */
  14         char *data;                /* actual data */
  15         enum {                     /* type of allocation */
  16                 BLOCK_TYPE_MMAP_ORIG, /* mmap(2)-ed from an external file */
  17                 BLOCK_TYPE_MMAP,      /* mmap(2)-ed from a temporary file only known to this process */
  18                 BLOCK_TYPE_MALLOC,    /* heap allocated block using malloc(3) */
  19         } type;
  20 } Block;
  21
  22 Block *block_alloc(size_t size);
  23 Block *block_read(size_t size, int fd);
  24 Block *block_mmap(size_t size, int fd, off_t offset);
  25 Block *block_load(int dirfd, const char *filename, enum TextLoadMethod method, struct stat *info);
  26 void block_free(Block*);
  27 bool block_capacity(Block*, size_t len);
  28 const char *block_append(Block*, const char *data, size_t len);
  29 bool block_insert(Block*, size_t pos, const char *data, size_t len);
  30 bool block_delete(Block*, size_t pos, size_t len);
  31
  32 Block *text_block_mmaped(Text*);
  33 void text_saved(Text*, struct stat *meta);
  34
  35 #endif