1 files changed, 102 insertions, 0 deletions
diff --git a/reference/C/CONTRIB/OR_USING_C/05.1.c b/reference/C/CONTRIB/OR_USING_C/05.1.c
new file mode 100644
index 0000000..7438fdc
--- /dev/null
+++ b/reference/C/CONTRIB/OR_USING_C/05.1.c
@@ -0,0 +1,102 @@
+#include <sys/ioctl.h>
+#include <stdio.h>
+
+main(argc, argv)
+int argc;
+char **argv;
+{
+    struct sgttyb sgo, sgn;
+    struct tchars tco, tcn;
+
+    if (argc < 2) {
+        fprintf(stderr, "Usage: %s file [file ...]\n", *argv);
+        exit(1);
+    }
+
+    /*
+     * In real life we'd check the return values of
+     * these, since if the input is redirected from
+     * a file they will fail.  We are assuming the
+     * terminal is always connected to the standard
+     * input.
+     */
+    ioctl(0, TIOCGETP, &sgo);
+    ioctl(0, TIOCGETC, &tco);
+
+    sgn = sgo;
+    sgn.sg_flags &= ~ECHO;      /* turn off ECHO   */
+    sgn.sg_flags |= CBREAK;     /* turn on CBREAK  */
+
+    tcn = tco;
+    tcn.t_intrc = -1;           /* disable int key */
+
+    /*
+     * Set the new modes.  Again we ignore return
+     * values.
+     */
+    ioctl(0, TIOCSETP, &sgn);
+    ioctl(0, TIOCSETC, &tcn);
+
+    while (--argc)
+        more(*++argv);
+
+    /*
+     * Reset the old tty modes.
+     */
+    ioctl(0, TIOCSETP, &sgo);
+    ioctl(0, TIOCSETC, &tco);
+
+    exit(0);
+}
+
+/*
+ * more--display the file.
+ */
+more(file)
+char *file;
+{
+    FILE *fp;
+    int line;
+    char linebuf[1024];
+
+    if ((fp = fopen(file, "r")) == NULL) {
+        perror(file);
+        return;
+    }
+
+    /*
+     * Print 22 lines at a time.
+     */
+    for (;;) {
+        line = 1;
+        while (line < 22) {
+            /*
+             * If end-of-file, let them hit a key one
+             * more time and then go back.
+             */
+            if (fgets(linebuf, sizeof(linebuf), fp) == NULL) {
+                fclose(fp);
+                prompt();
+                return;
+            }
+
+            fwrite(linebuf, 1, strlen(linebuf), stdout);
+            line++;
+        }
+
+        prompt();
+    }
+}
+
+/*
+ * prompt--prompt for a character.
+ */
+prompt()
+{
+    char answer;
+
+    printf("Type any character for next page: ");
+    answer = getchar();
+    putchar('\n');
+}
+