Add solutionf of 1-22

chapter_1/1-22/fold.c

@@ -0,0 +1,58 @@
+/*
+ * Write a program to "fold" long input lines into two or more shorter lines
+ * after the last non-blank character that occurs before the n-th column of
+ * input. Make sure your program does something intelligent with very long
+ * lines, and if there are no blanks or tabs before the specified column.
+ *
+ * Date: April 13, 2012
+ */
+
+#include <stdio.h>
+
+#define MAXLINE 1000
+#define MAXLENGTH 10
+
+int _getline(char line[], int maxline);
+
+main()
+{
+  int i, j, len, offset;
+  char line[MAXLINE];
+
+  while ((len = _getline(line, MAXLINE)) > 0) {
+    for (i = 0; i < len; ++i) {
+
+      if (i % MAXLENGTH == 0 && i != 0) {
+        j = 0;
+        offset = i;
+
+        while (offset > 0 && line[offset] != ' ' && line[offset] != '\t') {
+          ++j;
+          offset = i - j;
+        }
+
+        if (offset != 0)
+          line[offset] = '\n';
+      }
+
+    }
+    printf("%s", line);
+  }
+}
+
+int _getline(char s[], int lim)
+{
+  int c, i;
+
+  for (i=0; i < lim-1 && (c=getchar())!=EOF && c!='\n'; ++i)
+    s[i] = c;
+
+  if (c == '\n') {
+    s[i] = c;
+    ++i;
+  }
+
+  s[i] = '\0';
+
+  return i;
+}