acquire-core-full/app/online/cm_ol_0027.c

/* Processed by ecpg (15.18 (Debian 15.18-0+deb12u1)) */
/* These include files are added by the preprocessor */
#include <ecpglib.h>
#include <ecpgerrno.h>
#include <sqlca.h>
/* End of automatic include section */

#line 1 "app/online/cm_ol_0027.pgc"
/* @tier medium @module cm @transform common-online */
/*
 * cm_ol_0027.pgc - 체크디짓 검증 서비스 (CM_OL_0027)  [tier=medium]
 *
 * 입력 번호(NUMBER: 카드/계좌 등)에 Luhn(모드10) 알고리즘을 적용하여
 * 유효성(VALID=Y/N)과 계산된 체크디짓을 응답한다. DB 접근 없는 순수 로직.
 * (ATMI void SVC(TPSVCINFO*) 대응)
 */
#include <stdio.h>
#include <string.h>

#include "txcore.h"
#include "acq_util.h"
#include "cm_core.h"


#line 1 "/usr/include/postgresql/sqlca.h"
#ifndef POSTGRES_SQLCA_H
#define POSTGRES_SQLCA_H

#ifndef PGDLLIMPORT
#if  defined(WIN32) || defined(__CYGWIN__)
#define PGDLLIMPORT __declspec (dllimport)
#else
#define PGDLLIMPORT
#endif							/* __CYGWIN__ */
#endif							/* PGDLLIMPORT */

#define SQLERRMC_LEN	150

#ifdef __cplusplus
extern "C"
{
#endif

struct sqlca_t
{
	char		sqlcaid[8];
	long		sqlabc;
	long		sqlcode;
	struct
	{
		int			sqlerrml;
		char		sqlerrmc[SQLERRMC_LEN];
	}			sqlerrm;
	char		sqlerrp[8];
	long		sqlerrd[6];
	/* Element 0: empty						*/
	/* 1: OID of processed tuple if applicable			*/
	/* 2: number of rows processed				*/
	/* after an INSERT, UPDATE or				*/
	/* DELETE statement					*/
	/* 3: empty						*/
	/* 4: empty						*/
	/* 5: empty						*/
	char		sqlwarn[8];
	/* Element 0: set to 'W' if at least one other is 'W'	*/
	/* 1: if 'W' at least one character string		*/
	/* value was truncated when it was			*/
	/* stored into a host variable.             */

	/*
	 * 2: if 'W' a (hopefully) non-fatal notice occurred
	 */	/* 3: empty */
	/* 4: empty						*/
	/* 5: empty						*/
	/* 6: empty						*/
	/* 7: empty						*/

	char		sqlstate[5];
};

struct sqlca_t *ECPGget_sqlca(void);

#ifndef POSTGRES_ECPG_INTERNAL
#define sqlca (*ECPGget_sqlca())
#endif

#ifdef __cplusplus
}
#endif

#endif

#line 16 "app/online/cm_ol_0027.pgc"


/* 숫자만 추출 후 자릿수 반환 */
static int cm_pack_digits(const char *src, char *dst, int dstlen)
{
    int i;
    int n = 0;

    for (i = 0; src[i] != '\0' && n < dstlen - 1; i++) {
        if (src[i] >= '0' && src[i] <= '9')
            dst[n++] = src[i];
    }
    dst[n] = '\0';
    return n;
}

/*
 * 오른쪽에서 왼쪽으로 이동하며 짝수번째(offset 기준) 자리를 2배,
 * 9 초과 시 자릿수 합으로 환산한 뒤 총합의 mod 10 을 반환한다.
 * offset=1: 마지막 자리 포함(전체 검증), offset=0: 체크디짓 산출용.
 */
static int cm_luhn_mod(const char *digits, int len, int offset)
{
    int sum = 0;
    int i;
    int pos = 0;

    for (i = len - 1; i >= 0; i--) {
        int d = digits[i] - '0';
        if (((pos + offset) & 1) == 1) {
            d *= 2;
            if (d > 9)
                d -= 9;
        }
        sum += d;
        pos++;
    }
    return sum % 10;
}

TX_SERVICE(CM_OL_0027, ctx)
{
    char number[40];
    char digits[36];
    int  len;
    int  valid;
    int  checkdigit;

    tx_log(TX_LOG_INFO, "[CM_OL_0027] 체크디짓 검증 서비스 진입");

    if (tx_buf_get(ctx->in, "NUMBER", number, sizeof(number)) != TX_OK) {
        tx_log(TX_LOG_ERROR, "[CM_OL_0027] NUMBER 누락");
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    len = cm_pack_digits(number, digits, sizeof(digits));
    if (len < 2) {
        tx_log(TX_LOG_WARN, "[CM_OL_0027] 검증대상 자릿수 부족 len=%d", len);
        tx_return(ctx, TX_EINVAL, ctx->out);
        return;
    }

    /* 전체 번호(체크디짓 포함) 합이 mod10==0 이면 유효 */
    valid = (cm_luhn_mod(digits, len, 1) == 0) ? 1 : 0;

    /* 본체(마지막 자리 제외)에 대해 산출되는 정상 체크디짓 */
    checkdigit = (10 - cm_luhn_mod(digits, len - 1, 0)) % 10;

    tx_buf_reset(ctx->out);
    tx_buf_setlong(ctx->out, "DIGITS", (long)len);
    tx_buf_sets(ctx->out, "VALID", valid ? "Y" : "N");
    tx_buf_setlong(ctx->out, "CHECKDIGIT", (long)checkdigit);
    tx_log(TX_LOG_INFO, "[CM_OL_0027] 검증완료 len=%d valid=%s cd=%d",
           len, valid ? "Y" : "N", checkdigit);
    tx_return(ctx, TX_OK, ctx->out);
}