Source Code 1992 March/Source_Code_CD-ROM_Walnut_Creek_March_1992.iso/msdos/c/jazlib.arc/VIEW.DMO

Text File | 1986-07-02 | 5KB | 175 lines

/*
┌────────────────────────────────────────────────────────────────────────────┐
│ Title   : view.c                                 │
│ Purpose : View a file on the screen but on exit, return the users screen   │
│        to what it originally was including the command line which         │
│        invoked this program.                         │
│            USAGE:     View <filename>                 │
│    Written by Jack Zucker - 75766,1336    301-794-5950  on 02-03-1986   │
└────────────────────────────────────────────────────────────────────────────┘
*/

#include <jaz.h>        /* misc macros */
#include <jzscreen.h>        /* window defs */
#include <gscreen.h>        /* global window constants */
#include <stdio.h>        /* standard io defs */

#define max(x,y) (x > y ? x : y)
#define min(x,y) (x < y ? x : y)

#define MAXLINES 2000        /* max lines in file */
#define PGUP 73
#define PGDN 81
#define HOME 71
#define END  79
#define DARR 80
#define UARR 72
#define ESC  27
#define ATTRIBUTE 31        /* video attribute for screen */
#define TIMER 0x1C        /* vector for timer interrupt */

int WDONE = 0;            /* flag for done with program */
int gcount = 17;        /* tic count for clock routine*/
int clock();            /* interrupt handler for clock*/

main(argc,argv)
int argc;
char **argv;
{
  TWINDOW *ptr;         /* pointer to window structure */
  char wbuf[256],wtemp[256],*strchr();
  int num,windex=0,wlinelen,wstart,w,wrow;
  char *pline[MAXLINES],*p;    /* allocate memory for lines */
  FILE *fd;
  char *ch,chr;
  int wch;
  TVECTOR wvec;         /* hold timer interrupt vector address */

  jzgetint(TIMER,&wvec);    /* get original timer address */

  ptr = jzappend(&g_header,7,0,0,0x18,0x4f,1); /* save original window */

  if (argc < 2) {
    printf("\nVIEW... by Jack A. Zucker @794-5950 | 794-8763 | 75766,1336");
    exitpgm(ptr,"USAGE:   View <filename>");
  }

  if (! (fd = fopen(argv[1],"r"))) {
    sprintf(wbuf,"Can't open %s",argv[1]);
    exitpgm(ptr,wbuf);
  }

  jzloccur(24,0);
  printf("Reading Line# ");
  jzclreol(0x18,0x0e,7);

  while ( (ch = fgets(wbuf,255,fd)) ) {    /* read file - display line# */
    tabtosp(wbuf,wtemp);
    wtemp[79] = '\0';
    p = strchr(wtemp,'\n');                      /* get rid of new lines */
    if (p) *p = '\0';                           /* get rid of new line */
    pline[windex] = (char *) malloc(strlen(wtemp)+1);     /* memory for line */
    jzloccur(24,14);
    printf("%04d",windex+1);
    strcpy(pline[windex],wtemp);  /* copy line into list */
    ++windex;
  }
  fclose(fd);

  windex--;        /* get last line number */
  wstart = 0;

  jzclreol(0x18,0,7);
  jzloccur(24,20);
  printf("ESC | UARR | DARR | HOME | END | PGUP | PGDN");

  jzinsint(TIMER,clock);           /* install our interrupt handler */

  dispscreen(pline,wstart,windex);
  do {
    jzloccur(24,0);                /* print line # of 1st line */
    printf("Line# %04d",wstart+1);
    if ((chr = jzinkey(&wch)))
      switch (chr) {                /* look for esc key - end */
    case ESC : WDONE = 1;
      }
    else
      switch(wch) {
    case PGUP :
      wstart = max(0,wstart-24);
      dispscreen(pline,wstart,windex);
      break;
    case PGDN :
      wstart = max(min(windex-23,wstart+24),0);
      dispscreen(pline,wstart,windex);
      break;
    case UARR :
      if (wstart) {
        wstart = max(0,wstart-1);
        jzscrldn(0,0x174f,1,ATTRIBUTE);           /* clear screen window */
        jzscrprn(pline[wstart],0,0,ATTRIBUTE);
      }
      break;
    case DARR :
      if (windex - (wstart + 23) > 0) {
        wstart = max(min(windex-23,wstart+1),0);
        jzscrlup(0,0x174f,1,ATTRIBUTE);           /* clear screen window */
        jzscrprn(pline[wstart+23],23,0,ATTRIBUTE);
      }
      break;
    case HOME :
      wstart = 0;
      dispscreen(pline,wstart,windex);
      break;
    case END :
      wstart = max(0,windex-23);
      dispscreen(pline,wstart,windex);
      break;
      }
  } while (! WDONE);

  jzsetint(TIMER,wvec);         /* restore original interrupt handler */

  jzloccur(ptr->row-2,ptr->col);        /* back to original pos */
  jzrstwnd(ptr);                /* restore users window */

}

exitpgm(fptr,fmsg)
TWINDOW *fptr;
char *fmsg;
{
   printf("\n%s",fmsg);                         /* print message */
   printf("\nHit <ENTER> to continue...");
   do ; while (getch() != 13);            /* loop 'til <ENTER> */
   jzloccur(fptr->row-2,fptr->col);        /* back to original pos */
   jzrstwnd(fptr);                /* restore users window */
   exit(1);
}

dispscreen(fline , fstart , findex)
char **fline;
int fstart,findex;
{
  int wrow,w;

  jzscrlup(0,0x174f,0,ATTRIBUTE);         /* clear screen window */
  wrow = 0;
  for(w = fstart; w <= fstart + 23 ; w ++)
    if (w > findex) return;
    else jzscrprn(fline[w],wrow++,0,ATTRIBUTE);       /* bios write str */
}

clock()
{
   char wstr[9];
   if (gcount >= 18) {
     jzbiostm(wstr);
     jzscrprn(wstr,24,71,MAGENTA);
     gcount = 0;
   }
   else
     gcount ++;
}