140 lines
2.8 KiB
C
140 lines
2.8 KiB
C
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#include "../uxn.h"
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#include "file.h"
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/*
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Copyright (c) 2021 Devine Lu Linvega
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Copyright (c) 2021 Andrew Alderwick
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Permission to use, copy, modify, and distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE.
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*/
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#define _POSIX_C_SOURCE 200809L
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#include <stdio.h>
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#include <dirent.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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static FILE *f;
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static DIR *d;
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static char *current_filename = "";
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static enum { IDLE,
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FILE_READ,
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FILE_WRITE,
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DIR_READ } state;
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static struct dirent *de;
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static void
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reset(void)
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{
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if(f != NULL) {
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fclose(f);
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f = NULL;
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}
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if(d != NULL) {
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closedir(d);
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d = NULL;
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}
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de = NULL;
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state = IDLE;
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}
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static Uint16
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get_entry(char *p, Uint16 len, const char *pathname, const char *basename, int fail_nonzero)
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{
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struct stat st;
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if(len < strlen(basename) + 7)
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return 0;
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if(stat(pathname, &st))
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return fail_nonzero ? snprintf(p, len, "!!!! %s\n", basename) : 0;
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else if(S_ISDIR(st.st_mode))
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return snprintf(p, len, "---- %s\n", basename);
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else if(st.st_size < 0x10000)
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return snprintf(p, len, "%04x %s\n", (Uint16)st.st_size, basename);
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else
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return snprintf(p, len, "???? %s\n", basename);
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}
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static Uint16
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file_read_dir(char *dest, Uint16 len)
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{
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static char pathname[4096];
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char *p = dest;
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if(de == NULL) de = readdir(d);
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for(; de != NULL; de = readdir(d)) {
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Uint16 n;
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if(de->d_name[0] == '.' && de->d_name[1] == '\0')
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continue;
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snprintf(pathname, sizeof(pathname), "%s/%s", current_filename, de->d_name);
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n = get_entry(p, len, pathname, de->d_name, 1);
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if(!n) break;
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p += n;
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len -= n;
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}
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return p - dest;
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}
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Uint16
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file_init(void *filename)
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{
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reset();
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current_filename = filename;
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return 0;
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}
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Uint16
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file_read(void *dest, Uint16 len)
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{
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if(state != FILE_READ && state != DIR_READ) {
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reset();
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if((d = opendir(current_filename)) != NULL)
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state = DIR_READ;
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else if((f = fopen(current_filename, "rb")) != NULL)
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state = FILE_READ;
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}
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if(state == FILE_READ)
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return fread(dest, 1, len, f);
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if(state == DIR_READ)
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return file_read_dir(dest, len);
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return 0;
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}
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Uint16
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file_write(void *src, Uint16 len, Uint8 flags)
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{
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Uint16 ret = 0;
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if(state != FILE_WRITE) {
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reset();
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if((f = fopen(current_filename, (flags & 0x01) ? "ab" : "wb")) != NULL)
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state = FILE_WRITE;
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}
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if(state == FILE_WRITE) {
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if((ret = fwrite(src, 1, len, f)) > 0 && fflush(f) != 0)
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ret = 0;
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}
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return ret;
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}
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Uint16
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file_stat(void *dest, Uint16 len)
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{
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char *basename = strrchr(current_filename, '/');
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if(basename != NULL)
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++basename;
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else
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basename = current_filename;
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return get_entry(dest, len, current_filename, basename, 0);
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}
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Uint16
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file_delete(void)
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{
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return unlink(current_filename);
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}
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