DouKaku?

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int main()
{
    char *data = "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
                 "<rss version=\"2.0\"><channel><title>どう書く？org 新着コメン
ト</title><link>http://ja.doukaku.org/</link><description>どう書く？orgに最近投
稿されたコード</description><language>ja</language><lastBuildDate>Fri, 13 Jul 20
07 11:17:01 -0000</lastBuildDate><item><title>ココサブ's comment on ウィンドウの
表示"
                 "</title><link>http://ja.doukaku.org/comment/744/</link><descri
ption>"
                 "&lt;a href=\"http://ja.doukaku.org/7/\"&gt;ウィンドウの表示&lt
;/a&gt;"
                 "&lt;hr&gt;";

    char *head, *tail;
    char *result;
    char *data_p;
    int  result_len;

    data_p = data;
    while (1) {
        head = strstr(data_p, "<lastBuildDate>");
        if (head == NULL) break;
        tail = strstr(head, "</lastBuildDate>");
        if (tail == NULL) break;

        /* 答えの長さを求める         */
        result_len = (tail - head) + strlen("</lastBuildDate>");

        result = malloc((result_len + 1) * sizeof(char));
        strncpy(result, head, result_len);
        result[result_len] = '\0';
        printf("%s\n", result);
        free(result);

        data_p = tail + strlen("</lastBuildDate>");
    }

    return 0;
}