builtin-merge-file.c

   1 #include "cache.h"
   2 #include "xdiff/xdiff.h"
   3
   4 static const char merge_file_usage[] =
   5 "git merge-file [-L name1 [-L orig [-L name2]]] file1 orig_file file2";
   6
   7 static int read_file(mmfile_t *ptr, const char *filename)
   8 {
   9         struct stat st;
  10         FILE *f;
  11
  12         if (stat(filename, &st))
  13                 return error("Could not stat %s", filename);
  14         if ((f = fopen(filename, "rb")) == NULL)
  15                 return error("Could not open %s", filename);
  16         ptr->ptr = xmalloc(st.st_size);
  17         if (fread(ptr->ptr, st.st_size, 1, f) != 1)
  18                 return error("Could not read %s", filename);
  19         fclose(f);
  20         ptr->size = st.st_size;
  21         return 0;
  22 }
  23
  24 int cmd_merge_file(int argc, char **argv, char **envp)
  25 {
  26         char *names[3];
  27         mmfile_t mmfs[3];
  28         mmbuffer_t result = {NULL, 0};
  29         xpparam_t xpp = {XDF_NEED_MINIMAL};
  30         int ret = 0, i = 0;
  31
  32         while (argc > 4) {
  33                 if (!strcmp(argv[1], "-L")) {
  34                         names[i++] = argv[2];
  35                         argc -= 2;
  36                         argv += 2;
  37                         continue;
  38                 }
  39                 usage(merge_file_usage);
  40         }
  41
  42         if (argc != 4)
  43                 usage(merge_file_usage);
  44
  45         for (; i < 3; i++)
  46                 names[i] = argv[i + 1];
  47
  48         for (i = 0; i < 3; i++)
  49                 if (read_file(mmfs + i, argv[i + 1]))
  50                         return -1;
  51
  52         ret = xdl_merge(mmfs + 1, mmfs + 0, names[0], mmfs + 2, names[2],
  53                         &xpp, XDL_MERGE_ZEALOUS, &result);
  54
  55         for (i = 0; i < 3; i++)
  56                 free(mmfs[i].ptr);
  57
  58         if (ret >= 0) {
  59                 char *filename = argv[1];
  60                 FILE *f = fopen(filename, "wb");
  61
  62                 if (!f)
  63                         ret = error("Could not open %s for writing", filename);
  64                 else if (fwrite(result.ptr, result.size, 1, f) != 1)
  65                         ret = error("Could not write to %s", filename);
  66                 else if (fclose(f))
  67                         ret = error("Could not close %s", filename);
  68                 free(result.ptr);
  69         }
  70
  71         return ret;
  72 }