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typedef struct { int end; int term; } jpc_enc_pass_t; void foo(int numpasses, jpc_enc_pass_t *p) { jpc_enc_pass_t *pass; jpc_enc_pass_t *termpass; for (pass = p; pass != termpass; ++pass) if (!pass->term) { termpass = pass; while (termpass - pass < numpasses && !termpass->term) ++termpass; pass->end = termpass->end; } }