tarl.c

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#include <stdio.h>

#define NAMSIZ 100
struct matches {
    int offset;
    char value;
} matches[] = {
    NAMSIZ+6,   ' ',
    NAMSIZ+7,   '\0',
    NAMSIZ+8+6, ' ',
    NAMSIZ+8+7, '\0',
    NAMSIZ+16+6,    ' ',
    NAMSIZ+16+7,    '\0',
    NAMSIZ+24+11,   ' ',
    NAMSIZ+36+11,   ' ',
    NAMSIZ+48+6,    '\0',
    0,      0,
};

int
istar(block)
char *block;
{
    int loop;

    for (loop = 0; matches[loop].offset != 0; loop++)
        if (block[matches[loop].offset] != matches[loop].value)
            return(0);
    return(1);
}

char buf[10240];
int bad;
int nleft = 0;
int whichnow;

main()
{
    int loop;
    int dir;
    char *block;
    extern char *readblock();

    bad = 0;

    for(;;) {
        block = readblock(0);

        if (block != NULL && istar(block))
            printf("%s\n", block);
    }
}

char *
readblock(desc)
int desc;
{
    int count;

    if (nleft > 0) {
        whichnow++;
        nleft--;
        return(buf+whichnow*512);
    }

    count = read(desc, buf, (int)sizeof(buf));
    if (count <= 0 || count%512 != 0) {
        if (count == 0)
            printf("---apparent EOF\n");
        else
            printf("---error\n");
        if (bad > 20)
            exit(1);
        bad++;
        return(NULL);
    }
    bad = 0;
    whichnow = 0;
    nleft = count/512 - 1;
    return(buf);
}