合并完版面后，需要对文章进行重新排序
下面程序只对.DIR进行排序
用法：sortdir brdname
brdname为需要对.DIR进行排序的版面名称，区分大小写

#include "bbs.h"

int compare(a, b)
struct fileheader *a, *b;
{
        return (atoi(a->filename + 2) - atoi(b->filename + 2));
}

int main(int argc, char **argv){
        int fd, size;
        char file[256];
        struct stat buf;
        char *mem;

        if(argc < 2){
                printf("Usage: sortdir board.\n");
                exit(0);
        }
        size = sizeof(struct fileheader);
        sprintf(file, "%s/boards/%s/%s", BBSHOME, argv[1], DOT_DIR);
        fd = open(file, O_RDWR, 0644);
        if(fd == -1){
                printf("Cannot open %s.\n", file);
                exit(0);
        }
        fstat(fd, &buf);
        mem = mmap (0, buf.st_size, PROT_READ | PROT_WRITE,
                        MAP_FILE | MAP_SHARED, fd, 0);
        qsort(mem, buf.st_size / size, size, compare);
        close(fd);
}
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