util.c - sic - simple irc client
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util.c (1348B)
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1 /* See LICENSE file for license details. */
2 #include <netdb.h>
3 #include <netinet/in.h>
4 #include <sys/socket.h>
5
6 static void
7 eprint(const char *fmt, ...) {
8 va_list ap;
9
10 va_start(ap, fmt);
11 vsnprintf(bufout, sizeof bufout, fmt, ap);
12 va_end(ap);
13 fprintf(stderr, "%s", bufout);
14 if(fmt[0] && fmt[strlen(fmt) - 1] == ':')
15 fprintf(stderr, " %s\n", strerror(errno));
16 exit(1);
17 }
18
19 static int
20 dial(char *host, char *port) {
21 struct addrinfo hints;
22 struct addrinfo *res, *r;
23 int fd;
24
25 memset(&hints, 0, sizeof hints);
26 hints.ai_family = AF_UNSPEC;
27 hints.ai_socktype = SOCK_STREAM;
28 if(getaddrinfo(host, port, &hints, &res) != 0)
29 eprint("error: cannot resolve hostname '%s':", host);
30 for(r = res; r; r = r->ai_next) {
31 if((fd = socket(r->ai_family, r->ai_socktype, r->ai_protocol)) == -1)
32 continue;
33 if(connect(fd, r->ai_addr, r->ai_addrlen) == 0)
34 break;
35 close(fd);
36 }
37 freeaddrinfo(res);
38 if(!r)
39 eprint("error: cannot connect to host '%s'\n", host);
40 return fd;
41 }
42
43 static char *
44 eat(char *s, int (*p)(int), int r) {
45 while(*s != '\0' && p((unsigned char)*s) == r)
46 s++;
47 return s;
48 }
49
50 static char*
51 skip(char *s, char c) {
52 while(*s != c && *s != '\0')
53 s++;
54 if(*s != '\0')
55 *s++ = '\0';
56 return s;
57 }
58
59 static void
60 trim(char *s) {
61 char *e;
62
63 for (e = s + strlen(s); e > s && isspace((unsigned char)*(e - 1)); e--)
64 ;
65 *e = '\0';
66 }