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Differences From Artifact [89d3d4a8c3]:

To Artifact [e2e9f14685]:


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    struct TextGrid tg;
    tg.data = data;
    tg.cols = strchr(data, '\n') - data + 1;
    tg.rows = tg.cols - 1; // rows includes the '\n'
    #if 0
    unsigned anti[256][2]; // locations of antinodes
    unsigned nanti = 0;



















    unsigned size = 1 + strchr(data, '\n') - data;
    for (unsigned row = 0; row < size-1; row++) {
        for (unsigned col = 0; col < size-1; col++) {
            char *p = data + linearize2d(size, row, col);
            if (*p != '.') {
                char *q = strchr(p + 1, *p);
                while (q) {







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    struct TextGrid tg;
    tg.data = data;
    tg.cols = strchr(data, '\n') - data + 1;
    tg.rows = tg.cols - 1; // rows includes the '\n'
    #if 0
    unsigned anti[256][2]; // locations of antinodes
    unsigned nanti = 0;
    #endif

    char *p = data;
    while (*p) {
        while ((*p == '.') || (*p == '\n')) p++;
        if (*p) {
            // p points to an antenna
            char *q = strchr(p+1, *p);
            while (q) {
                // q points to an antenna of the same type as p
                printf("p is at (C:%u, R:%u); q is at (C:%u, R:%u)\n",
                      TGcol(&tg, p), TGrow(&tg, p),
                      TGcol(&tg, q), TGrow(&tg, q));
                q = strchr(q+1, *p); // next antenna of this type
            }
            p += 1;
        }
    }
    #if 0
    unsigned size = 1 + strchr(data, '\n') - data;
    for (unsigned row = 0; row < size-1; row++) {
        for (unsigned col = 0; col < size-1; col++) {
            char *p = data + linearize2d(size, row, col);
            if (*p != '.') {
                char *q = strchr(p + 1, *p);
                while (q) {