getopt.diff

From 1bc6fab60b08ae9f26df39ce135d4a0004675415 Mon Sep 17 00:00:00 2001
From: Cristian Canedo <ccanedo@mailbox.org>
Date: Sat, 14 Oct 2023 12:06:02 -0500
Subject: [PATCH] getopt

---
 uhm.c | 45 ++++++++++++++++++++++++++++++++++-----------
 1 file changed, 34 insertions(+), 11 deletions(-)

diff --git a/uhm.c b/uhm.c
index 53413a3..9b31a6d 100644
--- a/uhm.c
+++ b/uhm.c
@@ -1,14 +1,13 @@
-#include <time.h>
-#include <unistd.h>
-#include <signal.h>
 #include <err.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
+#include <time.h>
+#include <unistd.h>
 
-static char *mbox = "/var/mail/user";
-static char *aud = "/mnt/aud/sounds/mail.wav";
-
-static void play(void)
+static void play(char *aud)
 {
     char *cmd[] = { "aucat", "-i", aud, NULL };
 
@@ -21,28 +20,52 @@ static void play(void)
     wait(NULL);
 }
 
-int main(void)
+static void usage(void)
 {
+    fprintf(stderr, "usage: uhm [-i delay] -f file -m mailbox\n");
+    exit(1);
+}
+
+int main(int argc, char *argv[])
+{
+    int opt, mflag = 0, fflag = 0, ms = 100;
+    char *mbox = NULL, *aud = NULL;
     struct stat st1, st2;
-    struct timespec delay = { 0, 100000000 };
+    struct timespec delay = { 0, ms * 1000000 };
 
+    while ((opt = getopt(argc, argv, "i:f:m:")) != -1) {
+        switch (opt) {
+        case 'i': ms = atoi(optarg); break;
+        case 'f': aud = optarg; fflag = 1; break;
+        case 'm': mbox = optarg; mflag = 1; break;
+        default: usage(); break;
+        }
+    }
+
+    if (!mflag || !fflag)
+        usage();
     if (access(mbox, F_OK) == -1)
         err(1, "%s", mbox);
     if (access(aud, F_OK) == -1)
         err(1, "%s", aud);
+    if (ms == 0)
+        ms = 100;
 
     signal(SIGCHLD, SIG_IGN);
 
+    delay.tv_sec = ms / 1000;
+    delay.tv_nsec = (ms % 1000) * 1000000;
+
     if (stat(mbox, &st1) == -1)
         err(1, "%s", mbox);
     if (st1.st_size > 0)
-        play();
+        play(aud);
 
     for (;;) {
         if (stat(mbox, &st2) == -1)
             err(1, "%s", mbox);
         if (st2.st_size > st1.st_size)
-            play();
+            play(aud);
         st1 = st2;
         nanosleep(&delay, NULL);
     }
-- 
2.37.3