1.19

2 files changed, 47 insertions, 1 deletions

diff --git a/1/17.c b/1/17.c
index 2797b10..70ee4f2 100644
--- a/1/17.c
+++ b/1/17.c
@@ -30,5 +30,5 @@ int cgetline(char s[], int max) {
     s[i] = c;
   s[i] = '\0';
 
-  return c != '\n' && c != EOF ? -1 : i;
+  return c != '\n' && c != EOF ? -1 : i - 1;
 }
\ No newline at end of file
diff --git a/1/19.c b/1/19.c
new file mode 100644
index 0000000..cba39a3
--- /dev/null
+++ b/1/19.c
@@ -0,0 +1,46 @@
+#include <stdio.h>
+
+#define MAXLEN 5
+
+int cgetline(char s[], int max);
+void reverse(char s[], int size);
+
+/* reverses input string */
+int main(int argc, char *argv[]) {
+  int size;
+  char s[MAXLEN];
+
+  while ((size = cgetline(s, MAXLEN)) > 0) {
+    reverse(s, size);
+    printf("%s\n", s);
+  }
+
+  if (size == -1) {
+    printf("exceeded max input size: %d\n", MAXLEN);
+    return 1;
+  }
+
+  return 0;
+}
+
+int cgetline(char s[], int max) {
+  int c, i;
+
+  for (i = 0; i < max - 1 && (c = getchar()) != EOF && c != '\n'; i++)
+    s[i] = c;
+  s[i] = '\0';
+
+  return i == max && c != '\n' && c != EOF ? -1 : i;
+}
+
+void reverse(char s[], int size) {
+  int i, j, lim;
+
+  lim = size / 2;
+
+  for (i = 0, j = size - i - 1; i < lim; i++) {
+    s[i] = s[i] ^ s[j];
+    s[j] = s[i] ^ s[j];
+    s[i] = s[i] ^ s[j];
+  }
+}
\ No newline at end of file