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Annotation of OpenXM/src/ox_gsl/ox_gsl.c, Revision 1.16

1.16    ! takayama    1: /* $OpenXM: OpenXM/src/ox_gsl/ox_gsl.c,v 1.15 2018/06/08 00:03:43 takayama Exp $
1.1       takayama    2: */
                      3:
                      4: #include <stdio.h>
                      5: #include <stdlib.h>
1.2       takayama    6: #include <setjmp.h>
                      7: #include <string.h>
1.3       takayama    8: #include <unistd.h>
1.10      ohara       9: #include <signal.h>
1.3       takayama   10: #include <math.h>
                     11: #include "ox_gsl.h"
                     12: #include "call_gsl.h" // need only when you bind call_gsl functions.
1.16    ! takayama   13: #include "call_gsl_sf.h"
1.1       takayama   14:
                     15: OXFILE *fd_rw;
                     16:
                     17: #define INIT_S_SIZE 2048
                     18: #define EXT_S_SIZE  2048
                     19:
                     20: static int stack_size = 0;
                     21: static int stack_pointer = 0;
                     22: static cmo **stack = NULL;
                     23:
                     24: int Debug=1;
                     25:
1.2       takayama   26: void show_stack_top() {
1.1       takayama   27:   cmo *data;
                     28:   if (stack_pointer > 0) {
                     29:     data=stack[stack_pointer-1];
1.2       takayama   30:     print_cmo(data); printf("\n");
1.1       takayama   31:   }else {
                     32:     printf("The stack is empty.\n");
                     33:   }
                     34: }
                     35:
1.3       takayama   36: void *gc_realloc(void *p,size_t osize,size_t nsize)
                     37: { return (void *)GC_realloc(p,nsize);}
                     38:
                     39: void gc_free(void *p,size_t size)
                     40: { GC_free(p);}
                     41:
1.1       takayama   42: void init_gc()
1.3       takayama   43: { GC_INIT();
                     44:   mp_set_memory_functions(GC_malloc,gc_realloc,gc_free);
1.5       takayama   45:   init_dic();  // initialize ox_eval.c
1.1       takayama   46: }
                     47:
1.2       takayama   48: void initialize_stack()
1.1       takayama   49: {
                     50:     stack_pointer = 0;
                     51:     stack_size = INIT_S_SIZE;
1.3       takayama   52:     stack = GC_malloc(stack_size*sizeof(cmo*));
1.1       takayama   53: }
                     54:
1.2       takayama   55: static void extend_stack()
1.1       takayama   56: {
                     57:     int size2 = stack_size + EXT_S_SIZE;
                     58:     cmo **stack2 = malloc(size2*sizeof(cmo*));
                     59:     memcpy(stack2, stack, stack_size*sizeof(cmo *));
                     60:     free(stack);
                     61:     stack = stack2;
                     62:     stack_size = size2;
                     63: }
                     64:
1.2       takayama   65: void push(cmo* m)
1.1       takayama   66: {
                     67:     stack[stack_pointer] = m;
                     68:     stack_pointer++;
                     69:     if (stack_pointer >= stack_size) {
                     70:         extend_stack();
                     71:     }
                     72: }
                     73:
                     74: cmo* pop()
                     75: {
                     76:     if (stack_pointer > 0) {
                     77:         stack_pointer--;
                     78:         return stack[stack_pointer];
                     79:     }
                     80:     return new_cmo_null();
                     81: }
                     82:
                     83: void pops(int n)
                     84: {
                     85:     stack_pointer -= n;
                     86:     if (stack_pointer < 0) {
                     87:         stack_pointer = 0;
                     88:     }
                     89: }
                     90:
                     91: #define OX_GSL_VERSION 2018032901
                     92: #define ID_STRING  "2018/03/29 13:56:00"
                     93:
                     94: int sm_mathcap()
                     95: {
1.2       takayama   96:   int available_cmo[]={
                     97:     CMO_NULL,
                     98:     CMO_INT32,
                     99: //    CMO_DATUM,
                    100:     CMO_STRING,
                    101:     CMO_MATHCAP,
                    102:     CMO_LIST,
                    103: //    CMO_MONOMIAL32,
                    104:     CMO_ZZ,
                    105: //    CMO_QQ,
                    106:     CMO_BIGFLOAT32,
                    107:     CMO_COMPLEX,
                    108:     CMO_IEEE_DOUBLE_FLOAT,
                    109:     CMO_ZERO,
                    110: //    CMO_DMS_GENERIC,
                    111: //    CMO_RING_BY_NAME,
                    112: //    CMO_INDETERMINATE,
                    113: //    CMO_DISTRIBUTED_POLYNOMIAL,
                    114: //    CMO_RECURSIVE_POLYNOMIAL,
                    115: //    CMO_POLYNOMIAL_IN_ONE_VARIABLE,
1.5       takayama  116:     CMO_TREE,
1.2       takayama  117:     CMO_ERROR2,
                    118:     0};
                    119:   int available_sm_command[]={
                    120:     SM_popCMO,
                    121:     SM_popString,
                    122:     SM_mathcap,
                    123:     SM_pops,
                    124: //    SM_executeStringByLocalParser,
                    125:     SM_executeFunction,
                    126:     SM_setMathCap,
                    127:     SM_shutdown,
                    128:     SM_control_kill,
                    129:     SM_control_reset_connection,
                    130:     SM_control_spawn_server,
                    131:     SM_control_terminate_server,
                    132:     0};
                    133:     mathcap_init(OX_GSL_VERSION, ID_STRING, "ox_gsl", available_cmo,available_sm_command);
                    134:     push((cmo *)oxf_cmo_mathcap(fd_rw));
1.1       takayama  135:     return 0;
                    136: }
                    137:
                    138: int sm_popCMO()
                    139: {
                    140:     cmo* m = pop();
                    141:
                    142:     if (m != NULL) {
                    143:         send_ox_cmo(fd_rw, m);
                    144:         return 0;
                    145:     }
                    146:     return SM_popCMO;
                    147: }
                    148:
1.3       takayama  149: cmo *make_error2(const char *reason,const char *fname,int line,int code)
1.1       takayama  150: {
1.3       takayama  151: // gsl_error_handler_t void handler(const char *reason,const char *file,int line, int gsl_errno)
                    152:     cmo *ms;
                    153:     cmo *err;
                    154:     cmo *m;
                    155:     cmo **argv;
                    156:     int n;
                    157:     char *s;
                    158:     n = 5;
                    159:     argv = (cmo **) GC_malloc(sizeof(cmo *)*n);
                    160:     ms = (cmo *)new_cmo_string("Error"); argv[0] = ms;
1.4       takayama  161:     if (reason != NULL) {s = (char *)GC_malloc(strlen(reason)+1); strcpy(s,reason);
                    162:     }else strcpy(s,"");
1.3       takayama  163:     ms = (cmo *) new_cmo_string(s); argv[1] = ms;
1.4       takayama  164:     if (fname != NULL) {s = (char *)GC_malloc(strlen(fname)+1); strcpy(s,fname);
                    165:     }else strcpy(s,"");
1.3       takayama  166:     ms = (cmo *) new_cmo_string(s); argv[2] = ms;
                    167:     err = (cmo *)new_cmo_int32(line); argv[3] = err;
                    168:     err = (cmo *)new_cmo_int32(code); argv[4] = err;
                    169:
                    170:     m = (cmo *)new_cmo_list_array((void *)argv,n);
                    171:     return (m);
1.1       takayama  172: }
                    173:
                    174: int get_i()
                    175: {
                    176:     cmo *c = pop();
                    177:     if (c->tag == CMO_INT32) {
                    178:         return ((cmo_int32 *)c)->i;
                    179:     }else if (c->tag == CMO_ZZ) {
                    180:         return mpz_get_si(((cmo_zz *)c)->mpz);
1.2       takayama  181:     }else if (c->tag == CMO_NULL) {
                    182:         return(0);
                    183:     }else if (c->tag == CMO_ZERO) {
                    184:         return(0);
1.1       takayama  185:     }
1.4       takayama  186:     myhandler("get_i: not an integer",NULL,0,-1);
1.1       takayama  187:     return 0;
                    188: }
                    189:
1.2       takayama  190: void get_xy(int *x, int *y)
1.1       takayama  191: {
                    192:     pop();
                    193:     *x = get_i();
                    194:     *y = get_i();
                    195: }
                    196:
1.2       takayama  197: void my_add_int32()
1.1       takayama  198: {
                    199:     int x, y;
                    200:     get_xy(&x, &y);
1.2       takayama  201:     push((cmo *)new_cmo_int32(x+y));
1.1       takayama  202: }
                    203:
1.2       takayama  204: double get_double()
                    205: {
1.3       takayama  206: #define mympz(c) (((cmo_zz *)c)->mpz)
1.2       takayama  207:     cmo *c = pop();
                    208:     if (c->tag == CMO_INT32) {
                    209:         return( (double) (((cmo_int32 *)c)->i) );
                    210:     }else if (c->tag == CMO_IEEE_DOUBLE_FLOAT) {
1.3       takayama  211:         return (((cmo_double *)c)->d);  // see ox_toolkit.h
1.2       takayama  212:     }else if (c->tag == CMO_ZZ) {
1.3       takayama  213:        if ((mpz_cmp_si(mympz(c),(long int) 0x7fffffff)>0) ||
                    214:            (mpz_cmp_si(mympz(c),(long int) -0x7fffffff)<0)) {
1.4       takayama  215:         myhandler("get_double: out of int32",NULL,0,-1);
1.3       takayama  216:          return(NAN);
                    217:        }
                    218:        return( (double) mpz_get_si(((cmo_zz *)c)->mpz));
1.2       takayama  219:     }else if (c->tag == CMO_NULL) {
                    220:         return(0);
                    221:     }else if (c->tag == CMO_ZERO) {
                    222:         return(0);
                    223:     }
1.4       takayama  224:     myhandler("get_double: not a double",NULL,0,-1);
1.3       takayama  225:     return(NAN);
1.2       takayama  226: }
1.14      takayama  227: /* get_double() will be obsolted and will be replaced by cmo2double(c) */
                    228: double cmo2double(cmo *c)
                    229: {
                    230: #define mympz(c) (((cmo_zz *)c)->mpz)
                    231:   if (c == NULL) c = pop();
                    232:     if (c->tag == CMO_INT32) {
                    233:         return( (double) (((cmo_int32 *)c)->i) );
                    234:     }else if (c->tag == CMO_IEEE_DOUBLE_FLOAT) {
                    235:         return (((cmo_double *)c)->d);  // see ox_toolkit.h
                    236:     }else if (c->tag == CMO_ZZ) {
                    237:        if ((mpz_cmp_si(mympz(c),(long int) 0x7fffffff)>0) ||
                    238:            (mpz_cmp_si(mympz(c),(long int) -0x7fffffff)<0)) {
                    239:         myhandler("get_double: out of int32",NULL,0,-1);
                    240:          return(NAN);
                    241:        }
                    242:        return( (double) mpz_get_si(((cmo_zz *)c)->mpz));
                    243:     }else if (c->tag == CMO_NULL) {
                    244:         return(0);
                    245:     }else if (c->tag == CMO_ZERO) {
                    246:         return(0);
                    247:     }
                    248:     myhandler("cmo2double: not a double",NULL,0,-1);
                    249:     return(NAN);
                    250: }
1.2       takayama  251:
                    252: void my_add_double() {
                    253:   double x,y;
                    254:   pop();
                    255:   y = get_double();
                    256:   x = get_double();
                    257:   push((cmo *)new_cmo_double(x+y));
                    258: }
                    259:
                    260: double *get_double_list(int *length) {
                    261:   cmo *c;
                    262:   cmo *entry;
                    263:   cell *cellp;
                    264:   double *d;
                    265:   int n,i;
                    266:   c = pop();
                    267:   if (c->tag != CMO_LIST) {
1.3       takayama  268: //    make_error2("get_double_list",NULL,0,-1);
1.2       takayama  269:     *length=-1; return(0);
                    270:   }
                    271:   n = *length = list_length((cmo_list *)c);
                    272:   d = (double *) GC_malloc(sizeof(double)*(*length+1));
                    273:   cellp = list_first((cmo_list *)c);
                    274:   entry = cellp->cmo;
                    275:   for (i=0; i<n; i++) {
                    276:     if (Debug) {
                    277:       printf("entry[%d]=",i); print_cmo(entry); printf("\n");
                    278:     }
                    279:     if (entry->tag == CMO_INT32) {
                    280:       d[i]=( (double) (((cmo_int32 *)entry)->i) );
                    281:     }else if (entry->tag == CMO_IEEE_DOUBLE_FLOAT) {
                    282:       d[i]=((cmo_double *)entry)->d;
                    283:     }else if (entry->tag == CMO_ZZ) {
                    284:       d[i]=( (double) mpz_get_si(((cmo_zz *)entry)->mpz));
                    285:     }else if (entry->tag == CMO_NULL) {
                    286:       d[i]= 0;
                    287:     }else {
                    288:       fprintf(stderr,"entries of the list should be int32 or zz or double\n");
                    289:       *length = -1;
1.3       takayama  290:       myhandler("get_double_list",NULL,0,-1);
1.2       takayama  291:       return(NULL);
                    292:     }
                    293:     cellp = list_next(cellp);
                    294:     entry = cellp->cmo;
                    295:   }
                    296:   return(d);
                    297: }
1.14      takayama  298: /* get_double_list will be obsolted and will be replaced by cmo2double_list() */
                    299: double *cmo2double_list(int *length,cmo *c) {
                    300:   cmo *entry;
                    301:   cell *cellp;
                    302:   double *d;
                    303:   int n,i;
                    304:   if (c == NULL) c = pop();
                    305:   if (c->tag != CMO_LIST) {
                    306: //    make_error2("get_double_list",NULL,0,-1);
                    307:     *length=-1; return(0);
                    308:   }
                    309:   n = *length = list_length((cmo_list *)c);
                    310:   d = (double *) GC_malloc(sizeof(double)*(*length+1));
                    311:   cellp = list_first((cmo_list *)c);
                    312:   entry = cellp->cmo;
                    313:   for (i=0; i<n; i++) {
                    314:     if (Debug) {
                    315:       printf("entry[%d]=",i); print_cmo(entry); printf("\n");
                    316:     }
                    317:     if (entry->tag == CMO_INT32) {
                    318:       d[i]=( (double) (((cmo_int32 *)entry)->i) );
                    319:     }else if (entry->tag == CMO_IEEE_DOUBLE_FLOAT) {
                    320:       d[i]=((cmo_double *)entry)->d;
                    321:     }else if (entry->tag == CMO_ZZ) {
                    322:       d[i]=( (double) mpz_get_si(((cmo_zz *)entry)->mpz));
                    323:     }else if (entry->tag == CMO_NULL) {
                    324:       d[i]= 0;
                    325:     }else {
                    326:       fprintf(stderr,"entries of the list should be int32 or zz or double\n");
                    327:       *length = -1;
                    328:       myhandler("get_double_list",NULL,0,-1);
                    329:       return(NULL);
                    330:     }
                    331:     cellp = list_next(cellp);
                    332:     entry = cellp->cmo;
                    333:   }
                    334:   return(d);
                    335: }
1.2       takayama  336: void show_double_list() {
                    337:   int n;
                    338:   double *d;
                    339:   int i;
                    340:   pop(); // pop argument number;
                    341:   d = get_double_list(&n);
1.3       takayama  342:   if (n < 0) fprintf(stderr,"Error in the double list\n");
1.2       takayama  343:   printf("show_double_list: length=%d\n",n);
                    344:   for (i=0; i<n; i++) {
                    345:     printf("%lg, ",d[i]);
                    346:   }
                    347:   printf("\n");
                    348: }
                    349:
                    350: char *get_string() {
                    351:   cmo *c;
                    352:   c = pop();
                    353:   if (c->tag == CMO_STRING) {
                    354:     return (((cmo_string *)c)->s);
                    355:   }
1.3       takayama  356:   // make_error2(-1);
1.2       takayama  357:   return(NULL);
                    358: }
1.1       takayama  359:
1.7       takayama  360: void test_ox_eval() {
1.5       takayama  361:   cmo *c;
                    362:   double d=0;
                    363:   pop();
1.7       takayama  364:   c=pop();
1.5       takayama  365:   if (Debug) {
1.7       takayama  366:     ox_printf("cmo *c="); print_cmo(c); ox_printf("\n");
1.5       takayama  367:   }
1.6       ohara     368:   init_dic();
1.5       takayama  369:   register_entry("x",1.25);
1.7       takayama  370:   if (eval_cmo(c,&d) == 0) myhandler("eval_cmo failed",NULL,0,-1);
1.5       takayama  371:   push((cmo *)new_cmo_double(d));
                    372: }
                    373:
1.1       takayama  374: int sm_executeFunction()
                    375: {
                    376:     cmo_string *func = (cmo_string *)pop();
                    377:     if (func->tag != CMO_STRING) {
1.3       takayama  378:         push(make_error2("sm_executeFunction, not CMO_STRING",NULL,0,-1));
1.1       takayama  379:         return -1;
                    380:     }
1.9       takayama  381:     init_dic();
1.2       takayama  382:     // Test functions
1.1       takayama  383:     if (strcmp(func->s, "add_int32") == 0) {
                    384:         my_add_int32();
1.2       takayama  385:     }else if (strcmp(func->s,"add_double")==0) {
                    386:         my_add_double();
                    387:     }else if (strcmp(func->s,"show_double_list")==0) {
                    388:         show_double_list();
1.3       takayama  389:     }else if (strcmp(func->s,"restart")==0) {
                    390:         pop(); restart();
1.5       takayama  391:     }else if (strcmp(func->s,"test_ox_eval")==0) {
                    392:         test_ox_eval();
1.2       takayama  393:     // The following functions are defined in call_gsl.c
                    394:     }else if (strcmp(func->s,"gsl_sf_lngamma_complex_e")==0) {
                    395:         call_gsl_sf_lngamma_complex_e();
1.8       takayama  396:     }else if (strcmp(func->s,"gsl_integration_qags")==0) {
                    397:         call_gsl_integration_qags();
1.11      takayama  398:     }else if (strcmp(func->s,"gsl_monte_plain_integrate")==0) {
1.12      takayama  399:         call_gsl_monte_plain_miser_vegas_integrate(0);
                    400:     }else if (strcmp(func->s,"gsl_monte_miser_integrate")==0) {
                    401:         call_gsl_monte_plain_miser_vegas_integrate(1);
                    402:     }else if (strcmp(func->s,"gsl_monte_vegas_integrate")==0) {
                    403:         call_gsl_monte_plain_miser_vegas_integrate(2);
1.15      takayama  404:     }else if (strcmp(func->s,"gsl_odeiv_step_rk4")==0) {
                    405:         call_gsl_odeiv_step("rk4");
1.16    ! takayama  406:     }else if (strcmp(func->s,"gsl_sf_gamma_inc")==0) {
        !           407:         call_gsl_sf_gamma_inc();
1.1       takayama  408:     }else {
1.3       takayama  409:         push(make_error2("sm_executeFunction, unknown function",NULL,0,-1));
1.1       takayama  410:         return -1;
1.2       takayama  411:     }
                    412:     return(0);
1.1       takayama  413: }
                    414:
                    415:
                    416: int receive_and_execute_sm_command()
                    417: {
                    418:     int code = receive_int32(fd_rw);
                    419:     switch(code) {
                    420:     case SM_popCMO:
                    421:         sm_popCMO();
                    422:         break;
                    423:     case SM_executeFunction:
                    424:         sm_executeFunction();
                    425:         break;
                    426:     case SM_mathcap:
                    427:         sm_mathcap();
                    428:         break;
                    429:     case SM_setMathCap:
                    430:         pop();
                    431:         break;
                    432:     default:
                    433:                 ;
                    434:     }
1.2       takayama  435:     return(0);
1.1       takayama  436: }
                    437:
                    438: int receive()
                    439: {
                    440:     int tag;
                    441:
                    442:     tag = receive_ox_tag(fd_rw);
                    443:     switch(tag) {
                    444:     case OX_DATA:
                    445:         push(receive_cmo(fd_rw));
                    446:         if (Debug) show_stack_top();
                    447:         break;
                    448:     case OX_COMMAND:
                    449:         if (Debug) show_stack_top();
                    450:         receive_and_execute_sm_command();
                    451:         break;
                    452:     default:
                    453:                 ;
                    454:     }
                    455:     return 0;
                    456: }
                    457:
1.2       takayama  458: jmp_buf Ox_env;
1.3       takayama  459: int Ox_intr_usr1=0;
1.2       takayama  460: void usr1_handler(int sig)
                    461: {
1.3       takayama  462:   Ox_intr_usr1=1;
                    463:   longjmp(Ox_env,1);
                    464: }
                    465: void restart() {
                    466:   Ox_intr_usr1=0;
1.2       takayama  467:   longjmp(Ox_env,1);
                    468: }
                    469:
1.3       takayama  470: void myhandler(const char *reason,const char *file,int line, int gsl_errno) {
                    471:   cmo *m;
                    472:   FILE *fp;
                    473:   char logname[1024];
                    474:   sprintf(logname,"/tmp/ox_gsl-%d.txt",(int) getpid());
                    475:   fp = fopen(logname,"w");
                    476:   fprintf(fp,"%d\n",gsl_errno);
                    477:   fprintf(fp,"%d\n",line);
                    478:   if (file != NULL) fprintf(fp,"%s\n",file); else fprintf(fp,"file?\n");
                    479:   if (reason != NULL) fprintf(fp,"%s\n",reason); else fprintf(fp,"reason?\n");
1.4       takayama  480:   fflush(NULL); fclose(fp);
1.3       takayama  481:   // m = make_error2(reason,file,line,gsl_errno);
                    482:   //  send_ox_cmo(fd_rw, m);  ox_flush(fd_rw);
                    483:   // send error packet even it is not asked. Todo, OK? --> no
                    484:   restart();
                    485: }
                    486: void push_error_from_file() {
                    487:   FILE *fp;
                    488: #define BUF_SIZE 1024
                    489:   char logname[BUF_SIZE];
                    490:   char cmd[BUF_SIZE];
                    491:   char file[BUF_SIZE];
                    492:   char reason[BUF_SIZE];
                    493:   int gsl_errno, line;
                    494:   cmo *m;
                    495:   fprintf(stderr,"push_error_from_file()\n");
                    496:   sprintf(logname,"/tmp/ox_gsl-%d.txt",(int) getpid());
1.4       takayama  497:   fp = fopen(logname,"r");
                    498:   if (fp == NULL) {
                    499:     fprintf(stderr,"open %s is failed\n",logname); return;
                    500:   }
1.3       takayama  501:   fgets(cmd,BUF_SIZE-2,fp); sscanf(cmd,"%d",&gsl_errno);
                    502:   fgets(cmd,BUF_SIZE-2,fp); sscanf(cmd,"%d",&line);
1.4       takayama  503: #define remove_newline(s) {char *tmp_pos; if ((tmp_pos=strchr(s,'\n')) != NULL) *tmp_pos = '\0';}
                    504:   fgets(file,BUF_SIZE-2,fp);  remove_newline(file);
                    505:   fgets(reason,BUF_SIZE-2,fp); remove_newline(reason);
1.3       takayama  506:   fclose(fp);
                    507:   m = make_error2(reason,file,line,gsl_errno);
                    508:   push(m);
                    509:   sprintf(cmd,"rm -f %s",logname);
                    510:   system(cmd);
                    511: }
1.1       takayama  512: int main()
                    513: {
1.2       takayama  514:   if ( setjmp(Ox_env) ) {
1.3       takayama  515:     fprintf(stderr,"resetting libgsl ...");
1.2       takayama  516:     initialize_stack();
1.3       takayama  517:     if (Ox_intr_usr1) {
                    518:       fprintf(stderr,"and sending OX_SYNC_BALL...");
                    519:       send_ox_tag(fd_rw,OX_SYNC_BALL);
                    520:     }
1.2       takayama  521:     fprintf(stderr,"done\n");
1.3       takayama  522:     Ox_intr_usr1=0;
                    523:     push_error_from_file();
1.2       takayama  524:   }else{
1.1       takayama  525:     ox_stderr_init(stderr);
                    526:     initialize_stack();
                    527:     init_gc();
                    528:     fd_rw = oxf_open(3);
                    529:     oxf_determine_byteorder_server(fd_rw);
1.2       takayama  530:   }
1.10      ohara     531: #if defined(__CYGWIN__)
                    532:   void *mysignal(int sig,void (*handler)(int m));
                    533:   mysignal(SIGUSR1,usr1_handler);
                    534: #else
1.2       takayama  535:   signal(SIGUSR1,usr1_handler);
1.10      ohara     536: #endif
1.2       takayama  537:
                    538:   while(1) {
                    539:     receive();
                    540:   }
                    541:   return(0);
1.1       takayama  542: }
1.13      takayama  543:
                    544: cmo *element_of_at(cmo *list,int k) {
                    545:   int length;
                    546:   static cmo * saved_list = NULL;
                    547:   static cmo **dic;
                    548:   int i;
                    549:   cell *cellp;
                    550:   if (list == NULL) {
                    551:     ox_printf("element_of_at: list is NULL.\n");
                    552:     return( (cmo *)NULL);
                    553:   }
                    554:   if (list->tag != CMO_LIST) {
                    555:     ox_printf("element_of_at: list is not list.\n");
                    556:     return((cmo *)NULL);
                    557:   }
                    558:   length = list_length((cmo_list *)list);
                    559:   if ((k < 0) || (k >= length)) {
                    560:     ox_printf("element_of_at: out of bound length=%d, k=%d.\n",length,k);
                    561:     return((cmo *)NULL);
                    562:   }
                    563:   if (list == saved_list) return(dic[k]);
                    564:   saved_list = list;
                    565:   dic = (cmo **)GC_malloc(sizeof(cmo *)*(length+1));
                    566:   if (dic == NULL) return((cmo *)NULL); // no more memory.
                    567:   cellp = list_first((cmo_list *)list);
                    568:   for (i=0; i<length; i++) {
                    569:     dic[i] = cellp->cmo;
                    570:     cellp = list_next(cellp);
                    571:   }
                    572:   return(dic[k]);
                    573: }
1.15      takayama  574:
                    575: int get_length(cmo *c) {
                    576:   if (c->tag != CMO_LIST) {
                    577:     return(-1);
                    578:   }
                    579:   return(list_length((cmo_list *)c));
                    580: }

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