inital commit

1 files changed, 119 insertions, 0 deletions

diff --git a/3.2.c b/3.2.c
new file mode 100644
index 0000000..57aef6c
--- /dev/null
+++ b/3.2.c
@@ -0,0 +1,119 @@
+#include <stdio.h>
+
+#define MAXLEN 5000 
+
+char* escape(char to[], const char from[]);
+char* etr(char to[], const char from[]);
+
+int 
+main(void)
+{
+  int i;
+  char input;
+  char str[MAXLEN];
+  char e[MAXLEN];
+  char r[MAXLEN];
+
+  for (i = 0; (input = getchar()) != EOF && i+1 < MAXLEN; ++i)
+    str[i] = input;
+
+  str[i] = '\0';
+  
+
+  if (str[i-1] != '\n')
+    printf("\n");
+
+  printf("%s\n", escape(e, str));
+  printf("%s\n", etr(r, e));
+
+  return 0;
+}
+
+char* 
+escape(char to[], const char from[])
+{
+  int i, j;
+
+  for (i = j = 0; from[i] != '\0' && j+1 < MAXLEN; ++i)
+    switch (from[i]) {
+      case '\n' :
+        to[j++] = '\\';
+        to[j++] = 'n';
+        break;
+      case '\t' :
+        to[j++] = '\\';
+        to[j++] = 't';
+        break;
+      case '\a' :
+        to[j++] = '\\';
+        to[j++] = 'a';
+        break;
+      case '\b' :
+        to[j++] = '\\';
+        to[j++] = 'b';
+        break;
+      case '\f' :
+        to[j] = '\\';
+        to[j++] = 'f';
+        break;
+      case '\r' :
+        to[j++] = '\\';
+        to[j++] = 'r';
+        break;
+      case '\v' :
+        to[j++] = '\\';
+        to[j++] = 'v';
+        break;
+      default:
+        to[j++] = from[i];
+        break;
+    }
+
+  to[i] = '\0';
+
+  return to;
+}
+
+char*
+etr(char to[], const char from[])
+{
+  int i, j;
+
+  for (i = j = 0; from[i] != '\0'; ++i) {
+    if (from[i] == '\\')
+      switch (from[++i]) {
+        case 'n' :
+          to[j++] = '\n';
+          break;
+        case 't' :
+          to[j++] = '\t';
+          break;
+        case 'a' :
+          to[j++] = '\a';
+          break;
+        case 'b' :
+          to[j++] = '\b';
+          break;
+        case 'f' :
+          to[j++] = '\f';
+          break;
+        case 'r' :
+          to[j++] = '\r';
+          break;
+        case 'v' :
+          to[j++] = '\r';
+          break;
+        default :
+          to[j++] = '\\';
+          to[j++] = from[i];
+          break;
+      }
+
+    else
+      to[j++] = from[i];
+  }
+
+  to[j] = '\0';
+
+  return to;
+}