static unsigned int BN_STACK_pop(BN_STACK *st)
	{
	return st->indexes[--(st->depth)];
	}
['int ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p,\n\tconst BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)\n\t{\n\tint ret = 0;\n\tBN_CTX *new_ctx = NULL;\n\tif (ctx == NULL)\n\t\tif ((ctx = new_ctx = BN_CTX_new()) == NULL) return 0;\n\tBN_CTX_start(ctx);\n\tif (BN_ucmp(BN_get0_nist_prime_192(), p) == 0)\n\t\tgroup->field_mod_func = BN_nist_mod_192;\n\telse if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0)\n\t\tgroup->field_mod_func = BN_nist_mod_224;\n\telse if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0)\n\t\tgroup->field_mod_func = BN_nist_mod_256;\n\telse if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0)\n\t\tgroup->field_mod_func = BN_nist_mod_384;\n\telse if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0)\n\t\tgroup->field_mod_func = BN_nist_mod_521;\n\telse\n\t\t{\n\t\tECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE, EC_R_NOT_A_NIST_PRIME);\n\t\tgoto err;\n\t\t}\n\tret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);\n err:\n\tBN_CTX_end(ctx);\n\tif (new_ctx != NULL)\n\t\tBN_CTX_free(new_ctx);\n\treturn ret;\n\t}', 'void BN_CTX_start(BN_CTX *ctx)\n\t{\n\tCTXDBG_ENTRY("BN_CTX_start", ctx);\n\tif(ctx->err_stack || ctx->too_many)\n\t\tctx->err_stack++;\n\telse if(!BN_STACK_push(&ctx->stack, ctx->used))\n\t\t{\n\t\tBNerr(BN_F_BN_CTX_START,BN_R_TOO_MANY_TEMPORARY_VARIABLES);\n\t\tctx->err_stack++;\n\t\t}\n\tCTXDBG_EXIT(ctx);\n\t}', 'void BN_CTX_end(BN_CTX *ctx)\n\t{\n\tCTXDBG_ENTRY("BN_CTX_end", ctx);\n\tif(ctx->err_stack)\n\t\tctx->err_stack--;\n\telse\n\t\t{\n\t\tunsigned int fp = BN_STACK_pop(&ctx->stack);\n\t\tif(fp < ctx->used)\n\t\t\tBN_POOL_release(&ctx->pool, ctx->used - fp);\n\t\tctx->used = fp;\n\t\tctx->too_many = 0;\n\t\t}\n\tCTXDBG_EXIT(ctx);\n\t}', 'static unsigned int BN_STACK_pop(BN_STACK *st)\n\t{\n\treturn st->indexes[--(st->depth)];\n\t}']