Started reverse

2 files changed, 69 insertions, 1 deletions

diff --git a/no_trailers.c b/no_trailers.c
index e600e35..80dbc0f 100644
--- a/no_trailers.c
+++ b/no_trailers.c
@@ -8,7 +8,7 @@ void copy(char to[], char from[]);
 
 /*
  * MAIN
- * Prints longest line in STDIN.
+ * Removes all trailing whitespace and blank lines from STDIN.
  */
 int main() {
     int len; // current line length
diff --git a/reverse.c b/reverse.c
new file mode 100644
index 0000000..0681560
--- /dev/null
+++ b/reverse.c
@@ -0,0 +1,68 @@
+#include<stdio.h>
+
+#define MAXLENGTH 1000
+
+// Prototypes
+int get_line(char line[], int maxlength);
+void line_copy(char to[], char from[]);
+void reverse_copy(char to[], char from[]);
+
+/*
+ * MAIN
+ * Reverse all lines on STDIN.
+ */
+int main() {
+    int len; // current line length
+    char line[MAXLENGTH]; // current input line
+    char reversed_line[MAXLENGTH]; // current reversed line
+
+    while ((len = get_line(line, MAXLENGTH)) > 0) {
+        reverse_copy(line, reversed_line, len);
+        printf("%s\n", reversed_line);
+    }
+    return 0;
+}
+
+/*
+ * GET_LINE
+ * Read STDIN into LINE up to MAXLENGTH.
+ * Returns the length of LINE.
+ */
+int get_line(char line[], int maxlength) {
+    int c, i;
+
+    for (i = 0; i < maxlength - 1 && (c = getchar()) != EOF && c != '\n'; ++i)
+        line[i] = c;
+    if (c == '\n') {
+        line[i] = c;
+        ++i;
+    }
+    line[i] = '\0';
+    return i;
+}
+
+/*
+ * LINE_COPY
+ * Copy FROM into TO; assume TO is big enough.
+ */
+void line_copy(char to[], char from[]) {
+    int i;
+
+    i = 0;
+    while ((to[i] = from[i]) != '\0')
+        ++i;
+}
+
+/*
+ * REVERSE_COPY
+ * Copy FROM into TO (of length LENGTH) in reverse order; assume TO is big
+ * enough.
+ */
+void reverse_copy(char to[], char from[], int length) {
+    int i;
+
+    i = 0;
+    while ((to[i] = from[i]) != '\0')
+        ++i;
+}
+