From: fredrik <fredrik@959494ce-11ee-0310-bf91-de5d638817bd>
Date: Fri, 18 Nov 2005 01:47:18 +0000 (+0000)
Subject: Initial import.
X-Git-Url: http://git.dolda2000.com/gitweb/?a=commitdiff_plain;h=306708ee9f3e2632783812e098c46e96ac2f76b7;p=utils.git

Initial import.


git-svn-id: svn+ssh://svn.dolda2000.com/srv/svn/repos/src/utils@517 959494ce-11ee-0310-bf91-de5d638817bd
---

diff --git a/findnulls.c b/findnulls.c
new file mode 100644
index 0000000..8c64653
--- /dev/null
+++ b/findnulls.c
@@ -0,0 +1,94 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+char buf[65536];
+
+void findnulls(int fd, char *source, int squelch)
+{
+    int i, ret, n, s, off;
+    
+    n = 0;
+    s = -1;
+    off = 0;
+    while(1) {
+	ret = read(fd, buf, sizeof(buf));
+	if(ret < 0) {
+	    if(source != NULL)
+		perror(source);
+	    else
+		perror("read");
+	    return;
+	}
+	for(i = 0; i < ret; i++) {
+	    if(buf[i] == 0) {
+		if(s == -1)
+		    s = off + i;
+		n++;
+	    } else {
+		if(n > 0) {
+		    if(n > squelch) {
+			if(source == NULL)
+			    printf("%i %i\n", s, n);
+			else
+			    printf("%s: %i %i\n", source, s, n);
+		    }
+		    s = -1;
+		    n = 0;
+		}
+	    }
+	}
+	off += ret;
+	if(ret == 0)
+	    break;
+    }
+    if(n > squelch) {
+	if(source == NULL)
+	    printf("%i %i\n", s, n);
+	else
+	    printf("%s: %i %i\n", source, s, n);
+    }
+}
+
+int main(int argc, char **argv)
+{
+    int i, c;
+    int squelch;
+    int fd;
+    
+    squelch = 1024;
+    while((c = getopt(argc, argv, "hs:")) >= 0) {
+	switch(c) {
+	case 's':
+	    squelch = atoi(optarg);
+	    break;
+	case 'h':
+	case '?':
+	case ':':
+	default:
+	    fprintf(stderr, "usage: findnulls [-h] [-s squelch] [FILE...]\n");
+	    exit((c == 'h')?0:1);
+	}
+    }
+    if(optind < argc) {
+	for(i = optind; i < argc; i++) {
+	    if((fd = open(argv[i], O_RDONLY)) < 0) {
+		perror(argv[i]);
+		continue;
+	    }
+	    findnulls(fd, argv[i], squelch);
+	    close(fd);
+	}
+    } else {
+	findnulls(0, NULL, squelch);
+    }
+    return(0);
+}
+
+/*
+ * Local Variables:
+ * compile-command: "gcc -Wall -g -o findnulls findnulls.c"
+ * End:
+ */