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- added a cache data structure
   - new_cache() adds a new cache strutuce and sets that one as the one
     being added to.
   - delete_cache() deletes the last cache and sets the previous one as
     current
   - start_cache() turns on caching for the current cache
   - stop_cache() turns off caching for the current cache
     (Both append_delayed() and send() data are stuck into the current cache)
- added a streams data structure
   - allows multiple versions of the output to be generated simultaneously
   - send() and flush_delayed() by default put all data into all streams
   - send_stream() lets one pick a stream to send data to
   - start_streams() starts off all of the streams requested
   - end_streams() sends the specified stream out, and free()s the rest
   - start_mode_stream end_mode_stream, allows one to change modes on
     specific streams, different streams can be in different modes.
   - the global var watch_mode can be used to check if a stream has
     changed modes, everytime a mode change occurs on a specific stream
     the watch_mode var for that stream gets set to zero.

/* =||>|===================== capaCommon.c =====================|<||= */
/* created 1994 by Isaac Tsai                                         */
/* 1994, 1995, 1996, 1997, 1998, 1999  copyrighted by Isaac Tsai      */
/* TODO: restructure capa_check_ans*() calls into one                 */
/* =||>|===================== capaCommon.c =====================|<||= */
#include <ctype.h>
#if defined(__sun) || defined(linux) || defined(__alpha) || defined(hpux) || defined(AIX) || defined(IRIX) 
#include <unistd.h>  /* lockf() */
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "capaParser.h"
#include "capaToken.h"
#include "capaCommon.h"
#include "ranlib.h"


/*----------------------------------------------------------*/
/*  flock() in SUN is in BSD compatibility lib              */
/*  #include <sys/file.h>                                   */
/*----------------------------------------------------------*/
char        Parse_class[QUARTER_K];
int         Parse_set;
int         Parse_section; 
char        Parse_student_number[MAX_STUDENT_NUMBER+1];
char        Parse_name[MAX_NAME_CHAR+1];
long        capaid_plus_gen;
int         managermode;
 
int     yyparse();
int     yylex();
extern  FILE *yyin;
extern  void yyrestart();


/*----------------------------------------------------------*/
/*  Lock file shared                                        */
/*  lock the file specified by file stream pointer sp       */
/*----------------------------------------------------------*/
int
flockstream_sh(sp) FILE *sp;
{
  int fd;
  
  fd = fileno(sp);
  
#if defined(__sun) || defined(hpux) || defined(AIX)
  return ( lockf(fd,F_LOCK, 0L) );
#else
  return (flock(fd,LOCK_SH));
#endif
}
/*----------------------------------------------------------*/
int
flockstream(sp) FILE *sp;
{
  int fd;
  
  fd = fileno(sp);
  
#if defined(__sun) || defined(hpux) || defined(AIX)
  return ( lockf(fd,F_LOCK, 0L) );
#else
  return (flock(fd,LOCK_EX));
#endif
}
/*----------------------------------------------------------*/
int
funlockstream(sp) FILE *sp;
{
  int fd;
  
  fd = fileno(sp);
  
#if defined(__sun) || defined(hpux) || defined(AIX)
  return ( lockf(fd,F_ULOCK, 0L) );
#else
  return ( flock(fd,LOCK_UN) );
#endif
}

int
inquery_a_lock(sp,cmd,type,offset,whence,len)
FILE *sp;int cmd;off_t offset;int whence;off_t len;
{
  struct flock lock;
  int    fd;
  lock.l_type   = type;   lock.l_start = offset;
  lock.l_whence = whence; lock.l_len   = len;
  fd=fileno(sp);
  return (fcntl(fd,cmd,&lock));
}
#define  Blocked_Write_Lock(sp) \
          inquery_a_lock(sp,F_SETLK,F_WRLCK,0,0,0)

#define  Blocked_Write_Lock(sp) \
          inquery_a_lock(sp,F_SETLK,F_WRLCK,0,0,0)

#define  Un_Lock(sp) \
          inquery_a_lock(sp,F_SETLK,F_UNLCK,0,0,0)

         


/******************************************************************************/
/* PARSE SOURCE FILE AND RETURN BLOCKS OF TEXT, unlike capa_parse_student     */
/******************************************************************************/
int  
capa_parse(set,problem,filename,num_questions,func_ptr)
int  set;Problem_t **problem;char *filename;int  *num_questions;
void (*func_ptr)();
{
  int   errcode,temp;
extern  FILE      *Input_stream[MAX_OPENED_FILE];
extern  char       Opened_filename[MAX_OPENED_FILE][QUARTER_K];
extern  int        Lexi_line;
extern  int        Lexi_qnum;
extern  Problem_t *FirstProblem_p;
extern  Problem_t *LastProblem_p;
extern  Problem_t *LexiProblem_p;
extern  char      *StartText_p;
extern  char      *EndText_p;
extern  char      *ErrorMsg_p;
extern  int        ErrorMsg_count;
extern  int        Symb_count;
extern  int        first_run;
extern  void       (*Status_Func)();
  char             warn_msg[WARN_MSG_LENGTH];
  
  if(ErrorMsg_p) { capa_mfree(ErrorMsg_p); ErrorMsg_p = NULL; }
  if(EndText_p)  { capa_mfree(EndText_p);  EndText_p  = NULL; }
  if(StartText_p)  { capa_mfree(StartText_p);  StartText_p  = NULL; }
  ErrorMsg_p = NULL; first_run = 1; EndText_p = NULL;
  Symb_count = ErrorMsg_count = Lexi_line = Lexi_qnum = 0;
  FirstProblem_p = LastProblem_p = NULL;
  LexiProblem_p = (Problem_t *)capa_malloc(sizeof(Problem_t),1);
  Status_Func=func_ptr;

#ifdef AVOIDYYINPUT
  yyin=fopen(filename,"r");
#else
 if ( (Input_stream[0]=fopen(filename,"r")) == NULL) {
     /* printf("Error: can't open %s\n",filename);*/
     sprintf(warn_msg,"capa_parse(): CANNOT OPEN FILE\"%s\", file does not exist or is not readable.\n", filename);
     capa_msg(MESSAGE_ERROR,warn_msg);
     return (-1);
  }
#endif
  sprintf(Opened_filename[0],"%s",filename);
  
  /*yyrestart(yyin);*/
  begin_text();
  /*if ( !yyparse() )  { errcode = Lexi_qnum; } else { errcode = 0; }*/
  if (!(temp=yylex())) { errcode = Lexi_qnum; } else { errcode = 0; }
  fprintf(stderr,"\nExited on: %d\n",temp);
  fprintf(stderr,"Current cache: %d\n",current_cache);
  fprintf(stderr,"Flushing:\n"); 
  flush_delayed();
  /* fclose(Input_stream[0]);*/ /*The Lexer handles closing this*/
  /* print_symb_stat(); */
  /*
  capa_mfree((char *)LexiProblem_p);
  LexiProblem_p = NULL;
  */
 (*problem) = FirstProblem_p;
 (*num_questions) = Lexi_qnum;
  return (errcode);
}

int dyn_maxlen=1000000;
int delay;
void dyn_init(struct dyn_string *dyn)
{
    dyn->len=0;
    dyn->max=0;
    dyn->str=NULL;
}

void dyn_free(struct dyn_string* dyn)
{
    if (dyn->str) {
      free(dyn->str);dyn->str=NULL;
      dyn->len=0;
      dyn->max=0;
    }
}


int append_message(struct dyn_string *dyn_msg,char *format,va_list ap) {
    char *new;
    int len,result;

    if ((result=vasprintf(&new,format,ap))==-1) {
      fprintf(stderr,"vaspintf didn't like :%s:",format);
      exit(1);
    }
    len=strlen(new);

#ifdef DYN_DEBUG
    fprintf(stderr,"before: len %d; gcount %d; max %d\n",
	    len,dyn_msg->len,dyn_msg->max);
#endif /* DYN_DEBUG */

    if (dyn_msg->len+len < dyn_maxlen) {
	if (dyn_msg->len+len>dyn_msg->max-2) {
	    dyn_msg->max=(dyn_msg->len+len)*2;
	    if (dyn_msg->max>dyn_maxlen) { dyn_msg->max=dyn_maxlen; }
	    if (dyn_msg->max != 0) {
	      dyn_msg->str=realloc(dyn_msg->str,dyn_msg->max);
	    } else {
	      return 1;
	    }
	    dyn_msg->str[dyn_msg->len]='\0';
	}
	strcat(dyn_msg->str,new);
	dyn_msg->len+=len;
    } else {
	if (dyn_msg->max != dyn_maxlen-1) { /*already maxed out or can 
					       we fit this one in?*/
	    dyn_msg->max=dyn_maxlen;
	    dyn_msg->str=realloc(dyn_msg->str,dyn_msg->max);
	    dyn_msg->str[dyn_msg->len]='\0';
	    strncat(dyn_msg->str,new,dyn_msg->max-dyn_msg->len-1);
	    dyn_msg->len=strlen(dyn_msg->str);
	}
    }
    free(new);

#ifdef DYN_DEBUG
    fprintf(stderr,"after: len %d; gcount %d; max %d; strlen(dyn_msg): %d\n",
	    len,dyn_msg->len,dyn_msg->max,strlen(dyn_msg->str));
#endif /* DYN_DEBUG */

    return 1;
}

void start_delayed(){ delay=1; }
void end_delayed(){ delay=0; }

void add_delayed(char *format, ...) {
    va_list ap;

    va_start(ap,format);
    append_message(&dyn_delayed,format,ap);
    if (do_cache[current_cache]) {
      append_message(&cached_data[current_cache],format,ap);
    }	
}

void flush_delayed()
{
  delay=0;
  if (dyn_delayed.str) { send(dyn_delayed.str); }
  dyn_free(&dyn_delayed);dyn_init(&dyn_delayed);
}


void send_to(int which, char *text, va_list ap)
{
  if (delay) {
    append_message(&dyn_delayed,text,ap);
  } else {
    if (num_streams) {
      if (which == ALL_STREAMS) {
	int i;
	for (i=0;i<num_streams;i++) { append_message(&streams[i],text,ap); }
      } else {
	append_message(&streams[which],text,ap);
      }
    } else {
      vprintf(text,ap);
    }
  }
  if (do_cache[current_cache]) {
    append_message(&cached_data[current_cache],text,ap);
  }	
}

void send(char *text,...)
{
  va_list ap;
  va_start(ap,text);
  send_to(ALL_STREAMS,text,ap);
}

void send_stream(int which, char *text,...)
{
  va_list ap;
  va_start(ap,text);
  send_to(which,text,ap);
}

int num_streams=0;
struct dyn_string streams[MAX_STREAMS];
void start_streams(int num) {
  int i;
  for(i=0; i<num; i++) { dyn_init(&streams[i]); }
  for(i=1; i<num; i++) { mode[i]=mode[0]; }
  num_streams=num;
}

void end_streams(int which) {
  int i;
  fputs(streams[which].str,stdout);
  for(i=0; i<num_streams; i++) { dyn_free(&streams[which]); }
  num_streams=0;
  mode[0]=mode[which];
}

int watch_mode[MAX_STREAMS];
void end_mode()
{
  end_mode_stream(ALL_STREAMS);
}

void end_mode_stream(int which)
{
  if (num_streams) {
    if (which == ALL_STREAMS) {
      int i;
      for (i=0;i<num_streams;i++) { end_mode_stream(i); }
      return;
    }
  } else {
    which=0;/* if streams aren't active make sure which is correct */
  }
  switch (mode[which]) {
  case MODE_COMMENT: send_stream(which,"</comment>\n"); break;
  case MODE_BLOCK: send_stream(which,"</block>\n"); break;
  case MODE_SCRIPT: send_stream(which,"</script>\n"); break;
  case MODE_OUTTEXT: send_stream(which,"<endouttext />\n"); break;
  case MODE_ANSWER: send_stream(which,"\n"); break;
  case MODE_HINT: send_stream(which,"<endouttext />\n</hintpart>\n</hintgroup>\n"); break;
  case MODE_IMPORT: send_stream(which,"</import>\n"); break;
  case MODE_NONE: break;
  }
  mode[which]=MODE_NONE;
  watch_mode[which]=0;
}

void start_mode(int newmode,char* args)
{
  start_mode_stream(ALL_STREAMS,newmode,args);
}

void start_mode_stream(int which,int newmode,char* args)
{
  if (num_streams) {
    if (which == ALL_STREAMS) {
      int i;
      for (i=0;i<num_streams;i++) { start_mode_stream(i,newmode,args); }
      return;
    } else {
      if (newmode == mode[which]) return;
    }
  } else {
    if (newmode == mode[0]) return;
    which=0;/* if streams aren't active make sure which is correct */
  }
  end_mode_stream(which);
  switch (newmode) {
  case MODE_COMMENT: send_stream(which,"<comment>\n"); break;
  case MODE_BLOCK: send_stream(which,"<block %s>\n",args); break;
  case MODE_SCRIPT: send_stream(which,"<script type=\"loncapa/perl\">\n"); break;
  case MODE_OUTTEXT: send_stream(which,"<startouttext />\n"); break;
  case MODE_ANSWER: send_stream(which,"\n"); break;
  case MODE_HINT: send_stream(which,"<hintgroup>\n<hintpart on=\"default\">\n<startouttext />\n"); break;
  case MODE_IMPORT: send_stream(which,"<import>"); break;
  case MODE_NONE: break;
  }
  mode[which]=newmode;
}

int current_cache=-1;
int do_cache[MAX_CACHE];
struct dyn_string cached_data[MAX_CACHE];

void new_cache()
{
  current_cache++;
  do_cache[current_cache]=1;
  if (current_cache>MAX_CACHE) { exit(CACHE_ERROR); }
  dyn_init(&cached_data[current_cache]);
}

void start_cache() 
{
  do_cache[current_cache]=1;
}

void stop_cache()
{
  do_cache[current_cache]=0;
}

void delete_cache()
{
  if (current_cache > -1) {
    dyn_free(&cached_data[current_cache]);
    current_cache--;
  }
}
/* =||>|===================== End of capaCommon.c =====================|<||= */