/*
 * dir.h — directory iteration via ESTEX F_FIRST / F_NEXT ($19 / $1A).
 *
 *   ffirst(pattern, &buf, attrib)
 *      Initialises the search.  The pattern is a DOS wildcard like
 *      `*.TXT` or `DATA\\*`.  attrib is the search mask (use FA_NORMAL
 *      to match plain files, OR in FA_DIREC to include subdirectories).
 *      Returns 0 on success (buf is populated), -1 on failure (errno set).
 *
 *   fnext(&buf)
 *      Steps to the next matching entry, reusing the same buf.  Returns
 *      0 on success, -1 when no more files match (errno = ENOENT) or on
 *      other errors.
 *
 *   The buffer fields below mirror ESTEX's layout exactly so we can hand
 *   it straight to the kernel.  Use `buf.found_name` (NUL-terminated DOS
 *   "name.ext" form) to display results.
 */

#ifndef DIR_H
#define DIR_H

#include <stdint.h>

/* File attribute bits (ESTEX / DOS standard). */
#define FA_NORMAL   0x00
#define FA_RDONLY   0x01
#define FA_HIDDEN   0x02
#define FA_SYSTEM   0x04
#define FA_LABEL    0x08
#define FA_DIREC    0x10
#define FA_ARCH     0x20

/* 256-byte work buffer for ESTEX F_FIRST / F_NEXT (B=1 mode). */
typedef struct {
    char     name[8];           /* +0   pattern: 8-byte filename */
    char     ext[3];            /* +8   pattern: 3-byte extension */
    uint8_t  attrib;            /* +11  search attribute */
    char     reserved[10];      /* +12  DSS internal state */
    uint16_t time;              /* +22  time of last write */
    uint16_t date;              /* +24  date of last write */
    uint16_t first_cluster;     /* +26  first cluster */
    uint32_t size;              /* +28  file size in bytes */
    uint8_t  found_attr;        /* +32  attribute of the matched file */
    char     found_name[223];   /* +33  NUL-terminated "name.ext" */
} ffblk_t;

int ffirst(const char *pattern, ffblk_t *buf, uint8_t attrib);
int fnext (ffblk_t *buf);

#endif