c - 用 C 语言编写的 IRC 机器人

Question

我从 here 找到了一个 IRC 机器人骨架尽管作者说应该可以，但它无法编译。 gcc 基本上会抛出这些错误

/tmp/cc39tOaX.o: In function raw': bot.c:(.text+0x73): undefined
reference tova_start' bot.c:(.text+0xaa): undefined reference to `va_end' collect2: error: ld returned 1 exit status

这似乎意味着这两个函数在原始函数中调用之前没有定义？

无论如何，这是代码。任何对开始解决这个问题的帮助都会有很大的帮助。

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <netdb.h>

int conn;
char sbuf[512];

void raw(char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
vsnprintf(sbuf, 512, fmt, ap);
va_end(ap);
printf("<< %s", sbuf);
write(conn, sbuf, strlen(sbuf));
}

int main() {

char *nick = "test";
char *channel = NULL;
char *host = "irc.dav7.net";
char *port = "6667";

char *user, *command, *where, *message, *sep, *target;
int i, j, l, sl, o = -1, start, wordcount;
char buf[513];
struct addrinfo hints, *res;

memset(&hints, 0, sizeof hints);
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
getaddrinfo(host, port, &hints, &res);
conn = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
connect(conn, res->ai_addr, res->ai_addrlen);

raw("USER %s 0 0 :%s\r\n", nick, nick);
raw("NICK %s\r\n", nick);

while ((sl = read(conn, sbuf, 512))) {
    for (i = 0; i < sl; i++) {
        o++;
        buf[o] = sbuf[i];
        if ((i > 0 && sbuf[i] == '\n' && sbuf[i - 1] == '\r') || o == 512) {
            buf[o + 1] = '\0';
            l = o;
            o = -1;

            printf(">> %s", buf);

            if (!strncmp(buf, "PING", 4)) {
                buf[1] = 'O';
                raw(buf);
            } else if (buf[0] == ':') {
                wordcount = 0;
                user = command = where = message = NULL;
                for (j = 1; j < l; j++) {
                    if (buf[j] == ' ') {
                        buf[j] = '\0';
                        wordcount++;
                        switch(wordcount) {
                            case 1: user = buf + 1; break;
                            case 2: command = buf + start; break;
                            case 3: where = buf + start; break;
                        }
                        if (j == l - 1) continue;
                        start = j + 1;
                    } else if (buf[j] == ':' && wordcount == 3) {
                        if (j < l - 1) message = buf + j + 1;
                        break;
                    }
                }

                if (wordcount < 2) continue;

                if (!strncmp(command, "001", 3) && channel != NULL) {
                    raw("JOIN %s\r\n", channel);
                } else if (!strncmp(command, "PRIVMSG", 7) || !strncmp(command, "NOTICE", 6)) {
                    if (where == NULL || message == NULL) continue;
                    if ((sep = strchr(user, '!')) != NULL) user[sep - user] = '\0';
                    if (where[0] == '#' || where[0] == '&' || where[0] == '+' || where[0] == '!') target = where; else target = user;
                    printf("[from: %s] [reply-with: %s] [where: %s] [reply-to: %s] %s", user, command, where, target, message);
                    //raw("%s %s :%s", command, target, message); // If you enable this the IRCd will get its "*** Looking up your hostname..." messages thrown back at it but it works...
                }
            }

        }
    }

}

return 0;

}

我尝试在函数 raw() 之前定义 va_start 和 va_end

void va_start();
void va_end();

但这并没有改变任何东西..

Answer 1

man va_start

给了我:

SYNOPSIS
       #include <stdarg.h>

       void va_start(va_list ap, last);
       type va_arg(va_list ap, type);
       void va_end(va_list ap);
       void va_copy(va_list dest, va_list src);

通过添加 #include <stdarg.h>这对我有用。