add func ptr example and ls script

3 files changed, 51 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index e6adbe2..8432404 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 BINS = ascii class depipe_strings dup fpipe pipe realloc strpbrk strsep \
        tokenizer getopt prime_mask linked_list pi_bbp string_tokenizer  \
        tcpserver tcpclient regexp c99 asm playground_05-25-2011 \
-       parent_to_child
+       parent_to_child funcptrs
 
 CURL = curl_tomem curl_tofile
 
diff --git a/funcptrs.c b/funcptrs.c
new file mode 100644
index 0000000..1d49418
--- /dev/null
+++ b/funcptrs.c
@@ -0,0 +1,41 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+void say1(void)
+{
+    printf("hello, world!\n");
+}
+
+void say2(void)
+{
+    printf("hello bro!\n");
+}
+
+/* quite silly function, it is better to return an int and modify a parameter */
+void (*swap_say( void (*current_say)(void) )) (void)
+{
+    if (!current_say)
+        return NULL;
+
+    void (*ret)(void) = NULL;
+
+    if (current_say == &say1)
+        ret = say2;
+    else
+        ret = say1;
+
+    return ret;
+}
+
+int main(int argc, char **argv)
+{
+    void (*say_fptr)(void) = say1;
+    say_fptr();
+
+    /* now modfiy the above func ptr */
+    say_fptr = swap_say(say_fptr);
+    say_fptr();
+
+    return 0;
+}
+
diff --git a/myls.sh b/myls.sh
new file mode 100755
index 0000000..2b80c9a
--- /dev/null
+++ b/myls.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+LIST=(*)
+ARR_SZ=${#LIST[@]}
+for ((i = 0; i < ARR_SZ; i++))
+do
+    echo "${LIST[$i]}"
+done;
+