5.6

1 files changed, 62 insertions, 0 deletions

diff --git a/5.6.3.c b/5.6.3.c
new file mode 100644
index 0000000..a186c1f
--- /dev/null
+++ b/5.6.3.c
@@ -0,0 +1,62 @@
+#include <stdio.h>
+
+#define MAXLEN 1000
+
+int get_line(char line[], const int max);
+int strindex(char source[], char pattern[]);
+
+int 
+main(void)
+{
+  int found, rightmost;
+  char line[MAXLEN];
+
+  char pattern[] = "ould";
+  found  = 0;
+
+  while (get_line(line, MAXLEN) > 0)
+    if ((rightmost = strindex(line, pattern)) >= 0) {
+      printf("%s >> match at char %d\n", line, rightmost+1);
+      found++;
+    }
+
+  printf("\nSneedGrep found %d match%s\n", found, (found > 0) ? "es" : "");
+
+  return 0;
+}
+
+int 
+get_line(char line[], const int max)
+{
+  int i;
+  char input;
+
+  for (i = 0; (input = getchar()) != EOF && input != '\n' && i < max-2; i++)
+    line[i] = input;
+
+  if (input == '\n' && i < max-2)
+    line[i++] = '\n';
+
+  line[i] = '\0';
+
+  return i;
+}
+
+int 
+strindex(char source[], char pattern[])
+{
+  int i, rightmost;
+  char *source_og = source;
+
+  rightmost = -1;
+
+  for (; *source; source++) {
+    for (i = 0; *(pattern +i) && *(source+i) == *(pattern+i); i++)
+      ;
+
+    if (!*(pattern+i))
+      rightmost = source - source_og;
+  }
+
+  return rightmost;
+}