From 7e0f021a9aec35fd8e6725e87e3313b101d26f5e Mon Sep 17 00:00:00 2001
From: Tobias Klauser <tklauser@distanz.ch>
Date: Sun, 27 Jan 2008 11:37:44 +0100
Subject: Initial import (2.0.2-6)

---
 reference/C/CONTRIB/OR_USING_C/09.1.c | 95 +++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 reference/C/CONTRIB/OR_USING_C/09.1.c

(limited to 'reference/C/CONTRIB/OR_USING_C/09.1.c')

diff --git a/reference/C/CONTRIB/OR_USING_C/09.1.c b/reference/C/CONTRIB/OR_USING_C/09.1.c
new file mode 100644
index 0000000..035186d
--- /dev/null
+++ b/reference/C/CONTRIB/OR_USING_C/09.1.c
@@ -0,0 +1,95 @@
+#include <stdio.h>
+
+main()
+{
+    char buf[1024];
+    char *args[64];
+
+    for (;;) {
+        /*
+         * Prompt for and read a command.
+         */
+        printf("Command: ");
+
+        if (gets(buf) == NULL) {
+            printf("\n");
+            exit(0);
+        }
+
+        /*
+         * Split the string into arguments.
+         */
+        parse(buf, args);
+
+        /*
+         * Execute the command.
+         */
+        execute(args);
+    }
+}
+
+/*
+ * parse--split the command in buf into
+ *         individual arguments.
+ */
+parse(buf, args)
+char *buf;
+char **args;
+{
+    while (*buf != NULL) {
+        /*
+         * Strip whitespace.  Use nulls, so
+         * that the previous argument is terminated
+         * automatically.
+         */
+        while ((*buf == ' ') || (*buf == '\t'))
+            *buf++ = NULL;
+
+        /*
+         * Save the argument.
+         */
+        *args++ = buf;
+
+        /*
+         * Skip over the argument.
+         */
+        while ((*buf != NULL) && (*buf != ' ') && (*buf != '\t'))
+            buf++;
+    }
+
+    *args = NULL;
+}
+
+/*
+ * execute--spawn a child process and execute
+ *           the program.
+ */
+execute(args)
+char **args;
+{
+    int pid, status;
+
+    /*
+     * Get a child process.
+     */
+    if ((pid = fork()) < 0) {
+        perror("fork");
+        exit(1);
+    }
+
+    /*
+     * The child executes the code inside the if.
+     */
+    if (pid == 0) {
+        execvp(*args, args);
+        perror(*args);
+        exit(1);
+    }
+
+    /*
+     * The parent executes the wait.
+     */
+    while (wait(&status) != pid)
+        /* empty */ ;
+}
+
-- 
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