1  #include "coreutils.h"
 2  
 3  #include <SD.h>
 4  #include <stdio.h>
 5  #include <string.h>
 6  
 7  extern char g_cwd[];
 8  
 9  static void resolve(const char *path, char *out, size_t cap) {
10    if (path[0] == '/')
11      strlcpy(out, path, cap);
12    else
13      snprintf(out, cap, "%s%s%s",
14               g_cwd, (strcmp(g_cwd, "/") == 0) ? "" : "/", path);
15  }
16  
17  int programs::coreutils::cmd_cp(int argc, char **argv) {
18    if (argc < 3) { printf("usage: cp <src> <dst>\n"); return 1; }
19  
20    char src[128], dst[128];
21    resolve(argv[1], src, sizeof(src));
22    resolve(argv[2], dst, sizeof(dst));
23  
24    File in = SD.open(src, FILE_READ);
25    if (!in) { printf("cp: cannot open %s\n", argv[1]); return 1; }
26  
27    File out = SD.open(dst, FILE_WRITE);
28    if (!out) { in.close(); printf("cp: cannot create %s\n", argv[2]); return 1; }
29  
30    char buf[512];
31    size_t total = 0;
32    while (in.available()) {
33      int n = in.readBytes(buf, sizeof(buf));
34      if (n <= 0) break;
35      out.write((uint8_t *)buf, n);
36      total += n;
37    }
38  
39    in.close();
40    out.close();
41    printf("copied %s -> %s (%u bytes)\n", argv[1], argv[2], (unsigned)total);
42    return 0;
43  }