init commit

3sem/kr/02.c

@@ -0,0 +1,34 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/wait.h>
+#include <string.h>
+
+int
+main(int argc, char **argv)
+{
+    int file = open(argv[1], O_RDONLY);
+    int file_out = open("tmp", O_WRONLY | O_CREAT | O_TRUNC, 0666);
+
+    dup2(file, 0);
+    dup2(file_out, 1);
+
+    char buf[101];
+    while (fgets(buf, 100, stdin) != NULL) {
+        for (int i = 0; i < strlen(buf); i++) {
+            if (!strncmp(buf + i, "begin", 5)) {
+                printf("{");
+                i += 4;
+            } else if (!strncmp(buf + i, "end", 3)) {
+                printf("}");
+                i += 2;
+            } else {
+                printf("%c", buf[i]);
+            }
+        }
+    }
+
+    rename("tmp", argv[1]);
+
+    return 0;
+}