merged kris' changes into mainstream sic

1 files changed, 81 insertions, 0 deletions

diff --git a/util.c b/util.c
new file mode 100644
index 0000000..5412efc
--- /dev/null
+++ b/util.c
@@ -0,0 +1,81 @@
+/* See LICENSE file for license details. */
+#include <netdb.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+
+static void
+eprint(const char *fmt, ...) {
+	va_list ap;
+
+	va_start(ap, fmt);
+	vsnprintf(bufout, sizeof bufout, fmt, ap);
+	va_end(ap);
+	fprintf(stderr, "%s", bufout);
+	if(fmt[0] && fmt[strlen(fmt) - 1] == ':')
+		fprintf(stderr, " %s\n", strerror(errno));
+	exit(1);
+}
+
+static int
+dial(char *host, char *port) {
+	static struct addrinfo hints;
+	int srv;
+	struct addrinfo *res, *r;
+
+	memset(&hints, 0, sizeof hints);
+	hints.ai_family = AF_UNSPEC;
+	hints.ai_socktype = SOCK_STREAM;
+	if(getaddrinfo(host, port, &hints, &res) != 0)
+		eprint("error: cannot resolve hostname '%s':", host);
+	for(r = res; r; r = r->ai_next) {
+		if((srv = socket(r->ai_family, r->ai_socktype, r->ai_protocol)) == -1)
+			continue;
+		if(connect(srv, r->ai_addr, r->ai_addrlen) == 0)
+			break;
+		close(srv);
+	}
+	freeaddrinfo(res);
+	if(!r)
+		eprint("error: cannot connect to host '%s'\n", host);
+	return srv;
+}
+
+#define strlcpy _strlcpy
+static void
+strlcpy(char *to, const char *from, int l) {
+	memccpy(to, from, '\0', l);
+	to[l-1] = '\0';
+}
+
+static void
+eat(char **s, int (*p)(int), int r) {
+	char *q;
+
+	for(q = *s; *q && p(*q) == r; q++)
+		;
+	*s = q;
+}
+
+static char*
+tok(char **s) {
+	char *p;
+
+	eat(s, isspace, 1);
+	p = *s;
+	eat(s, isspace, 0);
+	if(**s)
+		*(*s)++ = '\0';
+	return p;
+}
+
+static char*
+ctok(char **s, int c) {
+	char *p, *q;
+
+	q = *s;
+	for(p = q; *p && *p != c; p++)
+		;
+	if(*p) *p++ = '\0';
+	*s = p;
+	return q;
+}