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I rewrote error handling functions.

/* -*- mode: C; coding: euc-japan -*- */
/* $OpenXM: OpenXM/src/ox_math/serv2.c,v 1.7 1999/11/07 12:12:56 ohara Exp $ */

/* Open Mathematica サーバ */
/* ファイルディスクリプタ 3, 4 は open されていると仮定して動作する. */

/* MathLink との通信部分 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <gmp.h>
#include <mathlink.h>
#include "ox.h"
#include "parse.h"
#include "serv2.h"

#define ERROR_ID_UNKNOWN_SM 10
#define ERROR_ID_FAILURE_MLINK         11

/* MLINK はポインタ型. */
MLINK lp = NULL;

typedef cmo mlo;
typedef cmo_string mlo_string;
typedef cmo_zz mlo_zz;

/* cmo_list の派生クラス*/
typedef struct {
    int tag;
    int length;
    cell head[1];
    char *function;
} mlo_function;


mlo *receive_mlo_zz()
{
    char *s;
    mlo  *m;

    fprintf(stderr, "--debug: MLO == MLTKINT.\n");
    MLGetString(lp, &s);
    fprintf(stderr, "--debug: zz = %s.\n", s);
    m = (mlo *)new_cmo_zz_set_string(s);
    MLDisownString(lp, s);
    return m;
}

mlo *receive_mlo_string()
{
    char *s;
    mlo  *m;
    fprintf(stderr, "--debug: MLO == MLTKSTR.\n");
    MLGetString(lp, &s);
    fprintf(stderr, "--debug: string = \"%s\".\n", s);
    m = (cmo *)new_cmo_string(s);
    MLDisownString(lp, s);
    return m;
}

cmo *receive_mlo_function()
{
    char *s;
    cmo *m;
    cmo  *ob;
    int  i,n;

    fprintf(stderr, "--debug: MLO == MLTKFUNC.\n");
    MLGetFunction(lp, &s, &n);
    fprintf(stderr, "--debug: Function = \"%s\", # of args = %d\n", s, n);
    m = new_cmo_list();
    append_cmo_list((cmo_list *)m, new_cmo_string(s));

    for (i=0; i<n; i++) {
        fprintf(stderr, "--debug: arg[%d]\n", i);
        fflush(stderr);
        ob = receive_mlo();
        append_cmo_list((cmo_list *)m, ob);
    }

    MLDisownString(lp, s);
    return m;
}

cmo *receive_mlo_symbol()
{
    cmo *ob;
    char *s;

    fprintf(stderr, "--debug: MLO == MLTKSYM.\n");
    MLGetSymbol(lp, &s);
    fprintf(stderr, "--debug: Symbol \"%s\".\n", s);

    ob = new_cmo_indeterminate(new_cmo_string(s)); 

    MLDisownString(lp, s);
    return ob;
}

/* Mathematica を起動する. */
int MATH_init()
{
    int argc = 2;
    char *argv[] = {"-linkname", "math -mathlink"};

    if(MLInitialize(NULL) == NULL 
       || (lp = MLOpen(argc, argv)) == NULL) {
        fprintf(stderr, "Mathematica Kernel not found.\n");
        exit(1);
    }
    return 0;
}

int MATH_exit()
{
    /* quit Mathematica then close the link */
    MLPutFunction(lp, "Exit", 0);
    MLClose(lp);
}

cmo *MATH_get_object()
{
    /* skip any packets before the first ReturnPacket */
    while (MLNextPacket(lp) != RETURNPKT) {
        usleep(10);
        MLNewPacket(lp);
    }
    return receive_mlo();
}

cmo *receive_mlo()
{
    char *s;
    int type;

    switch(type = MLGetNext(lp)) {
    case MLTKINT:
        return receive_mlo_zz();
    case MLTKSTR:
        return receive_mlo_string();
    case MLTKREAL:
        /* double はまだ... */
        fprintf(stderr, "--debug: MLO == MLTKREAL.\n");
        MLGetString(lp, &s);
        return (cmo *)new_cmo_string(s);
    case MLTKSYM:
        return receive_mlo_symbol();
    case MLTKFUNC:
        return receive_mlo_function();
    case MLTKERR:
        fprintf(stderr, "--debug: MLO == MLTKERR.\n");
        return (cmo *)make_error_object(ERROR_ID_FAILURE_MLINK, new_cmo_null());
    default:
        fprintf(stderr, "--debug: MLO(%d) is unknown.\n", type);
        MLGetString(lp, &s);
        fprintf(stderr, "--debug: \"%s\"\n", s);
        return (cmo *)new_cmo_string(s);
    }
}

int send_mlo_int32(cmo *m)
{
    MLPutInteger(lp, ((cmo_int32 *)m)->i);
}

int send_mlo_string(cmo *m)
{
    char *s = ((cmo_string *)m)->s;
    MLPutString(lp, s);
    fprintf(stderr, "ox_math:: put %s.", s);
}

int send_mlo_zz(cmo *m)
{
    char *s;
    MLPutFunction(lp, "ToExpression", 1);
    s = convert_cmo_to_string(m);
    MLPutString(lp, s);
    fprintf(stderr, "put %s.", s);
}

int send_mlo_list(cmo *c)
{
    char *s;
    cell *cp = ((cmo_list *)c)->head;
    int len = length_cmo_list((cmo_list *)c);

    fprintf(stderr, "ox_math:: put List with %d args.\n", len);
    MLPutFunction(lp, "List", len);
    while(cp->next != NULL) {
        send_mlo(cp->cmo);
        cp = cp->next;
    }
}

int MATH_sendObject(cmo *m)
{
    send_mlo(m);
    MLEndPacket(lp);
}

int send_mlo(cmo *m)
{
    char *s;
    switch(m->tag) {
    case CMO_INT32:
        send_mlo_int32(m);
        break;
    case CMO_STRING:
        send_mlo_string(m);
        break;
    case CMO_LIST:
        send_mlo_list(m);
        break;
    default:
        MLPutFunction(lp, "ToExpression", 1);
        s = convert_cmo_to_string(m);
        MLPutString(lp, s);
        fprintf(stderr, "put %s.", s);
        break;
    }
}

int MATH_evaluateStringByLocalParser(char *str)
{
    MLPutFunction(lp, "ToExpression", 1);
    MLPutString(lp, str);
    MLEndPacket(lp);
}

int MATH_executeFunction(char *function, int argc, cmo *argv[])
{
    int i;
    MLPutFunction(lp, function, argc);
    for (i=0; i<argc; i++) {
        send_mlo(argv[i]);
    }
    MLEndPacket(lp);
}

/* MathLink 非依存部分 */

#define SIZE_OPERAND_STACK   2048

static cmo* Operand_Stack[SIZE_OPERAND_STACK];
static int Stack_Pointer = 0;

int initialize_stack()
{
    Stack_Pointer = 0;
} 

int push(cmo* m)
{
#if DEBUG
    symbol *symp;

    if (m->tag == CMO_STRING) {
        fprintf(stderr, "ox_math:: a CMO_STRING(%s) was pushed.\n", ((cmo_string *)m)->s);
    }else {
        symp = lookup_by_tag(m->tag);
        fprintf(stderr, "ox_math:: a %s was pushed.\n", symp->key);
    }
#endif
    Operand_Stack[Stack_Pointer] = m;
    Stack_Pointer++;
    if (Stack_Pointer >= SIZE_OPERAND_STACK) {
        fprintf(stderr, "stack over flow.\n");
        Stack_Pointer--;
    }
}

/* スタックが空のときは, (CMO_NULL) をかえす. */
cmo* pop()
{
    if (Stack_Pointer > 0) {
        Stack_Pointer--;
        return Operand_Stack[Stack_Pointer];
    }
    return new_cmo_null();
}

void pops(int n)
{
    Stack_Pointer -= n;
    if (Stack_Pointer < 0) {
        Stack_Pointer = 0;
    }
}

/* sm_XXX 関数群は、エラーのときは 0 以外の値を返し、呼び出し元で
   エラーオブジェクトをセットする */
int sm_popCMO(int fd_write)
{
    cmo* m = pop();
#ifdef DEBUG
    symbol *symp = lookup_by_tag(m->tag);
    
    fprintf(stderr, "ox_math:: opecode = SM_popCMO. (%s)\n", symp->key);
#endif
    if (m != NULL) {
        send_ox_cmo(fd_write, m);
        return 0;
    }
    return SM_popCMO;
}

int sm_pops(int fd_write)
{
    cmo* m = pop();
    if (m != NULL && m->tag == CMO_INT32) {
        pops(((cmo_int32 *)m)->i);
        return 0;
    }
    return ERROR_ID_UNKNOWN_SM;
}

/* MathLink 依存部分 */
int sm_popString(int fd_write)
{
    char *s;
    cmo *err;
    cmo *m;

#ifdef DEBUG
    fprintf(stderr, "ox_math:: opecode = SM_popString.\n");
#endif

    m = pop();
    if (m->tag == CMO_STRING) {
        send_ox_cmo(fd_write, m);
    }else if ((s = convert_cmo_to_string(m)) != NULL) {
        send_ox_cmo(fd_write, (cmo *)new_cmo_string(s));
    }else {
        err = make_error_object(SM_popString, m);
        send_ox_cmo(fd_write, err);
    }
    return 0;
}

int local_execute(char *s)
{
    return 0;
}

/* この関数はサーバに依存する. */
int sm_executeStringByLocalParser(int fd_write)
{
    symbol *symp;
    cmo* m = pop();
    char *s = NULL;
#ifdef DEBUG
    fprintf(stderr, "ox_math:: opecode = SM_executeStringByLocalParser.\n");
#endif

    if (m->tag == CMO_STRING
        && strlen(s = ((cmo_string *)m)->s) != 0) {
        if (s[0] == ':') {
            local_execute(s);
        }else {
            /* for mathematica */
            /* mathematica に文字列を送って評価させる */
            MATH_evaluateStringByLocalParser(s);
            push(MATH_get_object());
        }
        return 0;
    }
#ifdef DEBUG
    if ((symp = lookup_by_tag(m->tag)) != NULL) {
        fprintf(stderr, "ox_math:: error. the top of stack is %s.\n", symp->key);
    }else {
        fprintf(stderr, "ox_math:: error. the top of stack is unknown cmo. (%d)\n", m->tag);
    }
#endif
    return SM_executeStringByLocalParser;
}

int sm_executeFunction(int fd_write)
{
    int i, argc;
    cmo **argv;
    char* func;
    cmo* m;

    if ((m = pop()) == NULL || m->tag != CMO_STRING) {
        return SM_executeFunction;
    }
    func = ((cmo_string *)m)->s;

    if ((m = pop()) == NULL || m->tag != CMO_INT32) {
        return SM_executeFunction;
    }

    argc = ((cmo_int32 *)m)->i;
    argv = malloc(argc*sizeof(cmo *));
    for (i=0; i<argc; i++) {
        argv[i] = pop();
    }
    MATH_executeFunction(func, argc, argv);
    push(MATH_get_object());
    return 0;
}

/* 平成11年10月13日 */
#define VERSION 0x11102700
#define ID_STRING  "ox_math server 1999/10/28 17:29:25"

int sm_mathcap(int fd_write)
{
    push(make_mathcap_object(VERSION, ID_STRING));
    return 0;
}

int receive_sm_command(int fd_read)
{
    return receive_int32(fd_read);
}

int execute_sm_command(int fd_write, int code)
{
    int err = 0;

    switch(code) {
    case SM_popCMO:
        err = sm_popCMO(fd_write);
        break;
    case SM_popString:
        err = sm_popString(fd_write);
        break;
    case SM_mathcap:
        err = sm_mathcap(fd_write);
        break;
    case SM_pops:
        err = sm_pops(fd_write);
        break;
    case SM_executeStringByLocalParser:
        err = sm_executeStringByLocalParser(fd_write);
        break;
    case SM_executeFunction:
        err = sm_executeFunction(fd_write);
        break;
    case SM_setMathCap:
        pop();  /* 無視する */
        break;
    default:
        fprintf(stderr, "unknown command: %d.\n", code);
        err = ERROR_ID_UNKNOWN_SM;
    }

    if (err != 0) {
        push((cmo *)make_error_object(err, new_cmo_null()));
    }
}