/* PBXA64 handbook-style C text example: csv_field_scan.
 * scan comma-separated fields with quote-state tracking. This source deliberately keeps every transformation visible
 * instead of hiding it behind library calls, making it useful for tracing.
 */
int main(void) {
    char s[] = "a,\"b,c\",d"; int i = 0, fields = 1, quote = 0; for (i = 0; s[i] != 0; ++i) { if (s[i] == '\"') quote = !quote; else if (s[i] == ',' && !quote) ++fields; } return fields == 3 ? 0 : 1;
}

/* Discussion: inspect the loop bounds, byte classification, and final return
 * value. The bounded-C frontend currently records CIR0200 for all C source;
 * this example remains a real handbook program for the public C surface once
 * that frontend gate is restored. */
