1 files changed, 53 insertions, 0 deletions

diff --git a/1/18.c b/1/18.c
new file mode 100644
index 0000000..ace507f
--- /dev/null
+++ b/1/18.c
@@ -0,0 +1,53 @@
+#include <stdio.h>
+
+#define MAXLEN 1000
+#define TRUE 1
+#define FALSE 0
+
+int getlineraw(char s[], int size);
+void trim(char to[], char from[], int size);
+
+/* removes trailing blanks and tabs from input */
+int main(int argc, char *argv[]) {
+  int size;
+  char s[MAXLEN], trimmed[MAXLEN];
+
+  while ((size = getlineraw(s, MAXLEN)) > 0) {
+    trim(trimmed, s, size);
+    printf("%s\n", trimmed);
+  }
+
+  if (size == -1) {
+    printf("exceeded max input size: %d\n", MAXLEN);
+    return 1;
+  }
+
+  return 0;
+}
+
+int getlineraw(char s[], int size) {
+  int c, i;
+
+  for (i = 0; i < size - 1 && (c = getchar()) != EOF && c != '\n'; i++)
+    s[i] = c;
+
+  return c != '\n' && c != EOF ? -1 : i;
+}
+
+void trim(char to[], char from[], int size) {
+  int i, c, trimmed;
+
+  trimmed = FALSE;
+
+  for (i = size - 1; i >= 0; i--) {
+    if (!trimmed) {
+      c = from[i];
+      if (c != ' ' && c != '\t') {
+        to[i] = c;
+        trimmed = TRUE;
+      }
+    } else {
+      to[i] = from[i];
+    }
+  }
+}
\ No newline at end of file