temporary commit

Now we can read grammars from a file.

But we need to check if it works for reading strings still.

1 files changed, 49 insertions, 0 deletions

diff --git a/src/util.c b/src/util.c
new file mode 100644
index 0000000..e228fbb
--- /dev/null
+++ b/src/util.c
@@ -0,0 +1,49 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include "util.h"
+
+/* Put the entire file content into the string str and the file size
+   into *len.
+
+   If errors occur, return non-zero; otherwise the return value is
+   zero.
+   
+   Note that *str should be already allocated.
+
+   Note that the length of the string str is actually 1+length, and
+   the last character is the null character. */
+unsigned char
+read_entire_file(const char *file_name, char **str, NUM *len)
+{
+  long file_size = 0;
+
+  FILE *file = fopen(file_name, "r");
+
+  if (!file) {
+    eprintf("%s:%d, Cannot open file \"%s\": ",
+            __FILE__, __LINE__, file_name);
+    perror(NULL);
+    return 1;
+  }
+
+  fseek(file, 0, SEEK_END);
+  file_size = ftell(file);
+  fseek(file, 0, SEEK_SET);
+  
+  *len = 1+file_size;
+
+  *str = realloc(*str, 1+file_size);
+  
+  if (*str == NULL) {
+    fleprintf0("%s:%d, Cannot realloc\n");
+    return 1;
+  }
+
+  fread(*str, sizeof(char), file_size, file);
+
+  fclose(file);
+
+  *(*str+file_size) = 0;
+
+  return 0;
+}