52     int b = 0;  // end index of unprocessed data  in parent()  local
54     while ((sz = read(parent_read, &buffer[b], sizeof(buffer) - 1 - b)) > 0) {  in parent()
56         sz += b;  in parent()
58         for (b = 0; b < sz; b++) {  in parent()
59             if (buffer[b] == '\r') {  in parent()
60                 buffer[b] = '\0';  in parent()
61             } else if (buffer[b] == '\n') {  in parent()
62                 buffer[b] = '\0';  in parent()
64                 a = b + 1;  in parent()
68         if (a == 0 && b == sizeof(buffer) - 1) {  in parent()
70             buffer[b] = '\0';  in parent()
72             b = 0;  in parent()
73         } else if (a != b) {  in parent()
75             b -= a;  in parent()
76             memmove(buffer, &buffer[a], b);  in parent()
80             b = 0;  in parent()
85     if (a != b) {  in parent()
86         buffer[b] = '\0';  in parent()