util.c - sic - simple irc client
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       ---
       util.c (1348B)
       ---
            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 }