tasks a-s

Task/Read-entire-file/C/read-entire-file-1.c

@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+  char *buffer;
+  FILE *fh = fopen("readentirefile.c", "rb");
+  if ( fh != NULL )
+  {
+    fseek(fh, 0L, SEEK_END);
+    long s = ftell(fh);
+    rewind(fh);
+    buffer = malloc(s);
+    if ( buffer != NULL )
+    {
+      fread(buffer, s, 1, fh);
+      // we can now close the file
+      fclose(fh); fh = NULL;
+
+      // do something, e.g.
+      fwrite(buffer, s, 1, stdout);
+
+      free(buffer);
+    }
+    if (fh != NULL) fclose(fh);
+  }
+  return EXIT_SUCCESS;
+}

Task/Read-entire-file/C/read-entire-file-2.c

@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+int main()
+{
+  char *buffer;
+  struct stat s;
+
+  int fd = open("readentirefile_mm.c", O_RDONLY);
+  if (fd < 0 ) return EXIT_FAILURE;
+  fstat(fd, &s);
+  /* PROT_READ disallows writing to buffer: will segv */
+  buffer = mmap(0, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+
+  if ( buffer != (void*)-1 )
+  {
+    /* do something */
+    fwrite(buffer, s.st_size, 1, stdout);
+    munmap(buffer, s.st_size);
+  }
+
+  close(fd);
+  return EXIT_SUCCESS;
+}