shared code for kat

2 files changed, 49 insertions, 0 deletions

diff --git a/src/util/map.c b/src/util/map.c
new file mode 100644
index 0000000..db691d3
--- /dev/null
+++ b/src/util/map.c
@@ -0,0 +1,39 @@
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "map.h"
+
+struct map *open_map(const char *fname) {
+  int fd = open(fname, O_RDONLY);
+
+  struct stat sb;
+  if (fstat(fd, &sb) == -1) {
+    fprintf(stderr, "Kon bestand niet lezen\n");
+    return NULL;
+  }
+
+  char *addr = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, fd, 0);
+  if (addr == MAP_FAILED) {
+    fprintf(stderr, "Kon bestand niet kaarten\n");
+    return NULL;
+  }
+
+  struct map *res = calloc(1, sizeof(struct map));
+
+  res->addr = addr;
+  res->sb = sb;
+  res->fd = fd;
+  return res;
+}
+
+void close_map(struct map *m) {
+  munmap(m->addr, m->sb.st_size);
+  close(m->fd);
+  free(m);
+}
diff --git a/src/util/map.h b/src/util/map.h
new file mode 100644
index 0000000..232720f
--- /dev/null
+++ b/src/util/map.h
@@ -0,0 +1,10 @@
+#include <sys/stat.h>
+
+struct map {
+  char *addr;
+  struct stat sb;
+  int fd;
+};
+
+struct map *open_map(const char *fname);
+void close_map(struct map *m);