half working translate

src/translate.c

@@ -2,9 +2,33 @@
  * Read from stdin. replace all occurences of arg 1 with arg2.
  */
 
+#include <string.h>
+const int BUF_SIZE = 1024;
+
+char translate_c(char src, char s1[], char s2[]) {
+  int n = strlen(s1);
+
+  for (int i = 0; i < n; i++) {
+    if (src == s1[i]) {
+      return s2[i];
+    }
+  }
+
+  return src;
+}
+
+void translate(char source[], char target[], char s1[], char s2[]) {
+  int n = strlen(source);
+
+  for (int i = 0; i < n; i++) {
+    target[i] = translate_c(source[i], s1, s2); // FIXME: this is buggy
+  }
+
+  target[n] = '\0';
+}
+
 #include <stdio.h>
-int main(int argc, char *argv[])
-{
+int main(int argc, char *argv[]) {
   char *translator[2];
   if (argc != 3) {
     printf("not enough arguments");
@@ -15,7 +39,14 @@ int main(int argc, char *argv[])
   printf("translator0: %s\n", translator[0]);
   printf("translator1: %s\n", translator[1]);
 
-    // TODO: translate from stdin and print to stdout
+  char source[BUF_SIZE];
+  char target[BUF_SIZE];
+
+  while (scanf("%s", source) != EOF) {
+    translate(source, target, translator[0], translator[1]);
+
+    printf("%s\n", target);
+  }
 
   return 0;
 }