src/tak.c


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#include <fcntl.h>
#include <stdio.h>
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>

#include "util/map.h"

int entry_tak(int argc, char **argv) {
  if (argc == 2 && strcmp(argv[1], "-h") == 0) {
    fprintf(stderr, "Gebruik: tak [BESTAND]...\n"
                    "\n"
                    "Schakel BESTAND(en) aaneen naar standaard uitvoer omgekeerd..\n");
    return 0;
  }

  for (int i = argc-1; i >= 1; i--) {
    const char *fname = argv[i];
    struct map *map = open_map(fname);

    char *lstart, *lend;
    lend = &map->addr[map->sb.st_size - 1];

    while (lend > map->addr) {
      if (*lend == '\n') {
        lend--;
      }

      lstart = lend;
      while (*lstart != '\n' && lstart != map->addr) {
        lstart--;
      }
      if (lstart != map->addr) {
        lstart++;
      }

      fwrite(lstart, 1, lend - lstart + 2, stdout);

      lend = lstart-1;
    }

    close_map(map);
  }

  return 0;
}