81 lines
1.4 KiB
C
81 lines
1.4 KiB
C
#include <netdb.h>
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#include <netinet/in.h>
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#include <sys/socket.h>
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#define va_buf(buf, fmt) {\
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va_list ap; \
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va_start(ap, fmt); \
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vsnprintf(buf, sizeof buf, fmt, ap); \
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va_end(ap); \
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}
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static void
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eprint(const char *fmt, ...) {
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va_buf(bufout, fmt);
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fprintf(stderr, "%s", bufout);
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if(fmt[0] && fmt[strlen(fmt)-1] == ':')
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fprintf(stderr, " %s\n", strerror(errno));
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exit(1);
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}
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static int
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dial(char *host, int port) {
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struct hostent *hp;
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static struct sockaddr_in addr;
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int i;
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if((i = socket(AF_INET, SOCK_STREAM, 0)) < 0)
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eprint("sic: cannot connect host '%s':", host);
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if(nil == (hp = gethostbyname(host)))
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eprint("sic: cannot resolve hostname '%s': %s\n", host, hstrerror(h_errno));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(port);
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memcpy(&addr.sin_addr, hp->h_addr, hp->h_length);
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if(connect(i, (struct sockaddr*)&addr, sizeof(struct sockaddr_in)))
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eprint("sic: cannot connect host '%s':", host);
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return i;
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}
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#define strlcpy _strlcpy
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static void
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strlcpy(char *to, const char *from, int l) {
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memccpy(to, from, '\0', l);
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to[l-1] = '\0';
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}
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static void
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eat(char **s, int (*p)(int), int r) {
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char *q;
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for(q=*s; *q && p(*q) == r; q++)
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;
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*s = q;
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}
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static char*
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tok(char **s) {
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char *p;
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eat(s, isspace, 1);
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p = *s;
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eat(s, isspace, 0);
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if(**s) *(*s)++ = '\0';
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return p;
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}
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static char*
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ctok(char **s, int c) {
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char *p, *q;
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q = *s;
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for(p=q; *p && *p != c; p++)
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;
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if(*p) *p++ = '\0';
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*s = p;
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return q;
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}
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