epr.c

EPSON 打印机的列表功能 C 语言源代码

 * appropriate number of spaces (determined by tabspaces variables).
 */
{
    register char *s;
    int c, chrs, num;
    int lmflg = 0;			/* TRUE ==> printed left margin. */
    int pmode;				/* Printing mode. */
#define PRINTMODE 0			/* Normal printing character. */
#define TABMODE 1			/* Expand tabs. */
#define UPARROWMODE 2			/* Uparrow prefix. */

    s = *sp;				/* Local copy of pointer. */
    chrs = 0;				/* Carriage position (no margin). */
/*    DBG(fprintf(dfp,"putline (%o)\n",s);)			*/

    while (1) {
	/* Dispatch on next character */
	c = *s++ & 0377;		/* Pick up a character. */
	if (c == EOH) {			/* Check for end-of-header. */
	    *sp = s;			/* Update the string pointer. */
	    return (c);			/* Return the terminator. */
	}
	if (c < SP || c == DEL) {
/*	    DBG(fprintf(dfp,"Ctrl %03o at %d\n",c,s - *sp);)	*/
	    switch (c) {
	    case CR:			/* Terminators. */
	    case LF:
		*sp = s;		/* Update the string pointer. */
		return (c);		/* Return the terminator. */

	    case BS:			/* Backspace -- backup if we can. */
		if (chrs) {
		    putc(c, ofp);
		    chrs--;
		}
		continue;		/* Proceed with the next char. */

	    case HT:			/* Horizontal tab -- expand it. */
		num = tabspaces - (chrs % tabspaces);
		pmode = TABMODE;
		break;

	    default:			/* Other control characters. */
		if (intl && validintl(c)) {
		    num = 1;		/* Int'l mode -- printing char. */
		    pmode = PRINTMODE;
		} else if (sflg) {	/* Special header  -- print it. */
		    num = 0;		/* Part of an escape sequence? */
		    pmode = PRINTMODE;
		} else if (cchar) {
		    num = 2;		/* Uparrow mode -- prefix it. */
		    pmode = UPARROWMODE;
		} else continue;	/* Unwanted char -- ignore it. */
	    }
	} else {			/* Regular printing char. */
	    num = 1;
	    pmode = PRINTMODE;
	}

	/*
	 *	If we get here we know we intend to print something.
	 * So, first we gotta print a left margin (if needed).  Next,
	 * we check whether we're about to cross the right margin.
	 * If all's OK we print whatever we're trying to print.
	 */

	if (!lmflg) {			/* Output blanks for left margin */
	    register int n = leftmar;
	    while (n--) putc(SP,ofp);
	    lmflg = 1;
	}

	chrs += num;			/* update count */
	if (chrs > cpl) {		/* handle overflow line */
/*	    DBG(fprintf(dfp,"Line overflow. *sp %o, s %o, diff %d\n",
		*sp,s,s - *sp);)				*/
	    if (!trunc) {		/* fold line */
		if (c != HT) s--;	/* back up a char */
		*sp = s;		/* Return updated pointer. */
		return (LL);		/* Indicate long line. */
	    }
	}

	switch (pmode) {		/* Dispatch on special print mode. */
	case PRINTMODE:			/* Normal printing char. */
	    putc(c, ofp);
	    break;

	case TABMODE:			/* Expand tabs. */
	    while (num--) putc(SP, ofp);
	    break;

	case UPARROWMODE:		/* Uparrow-prefix. */
	    putc('^', ofp);
	    if (c == DEL) {
		putc('?', ofp);
	    } else {
		putc(c + '@', ofp);
	    }
	}
    }
}

validintl (c)
    char c;
/*
 * Returns 1 if char c is one of the international characters for
 * the Epson printer, 0 otherwise.  (An international character is
 * one that is assigned an Ascii code in the range 0 to 31 decimal,
 * but that can be printed if in a special mode--Epson calls this
 * mode "control code selection".)
 */
{
    if (c < 6 || c == 16 || c == 17 || c >= 21 && c <= 31 && c != 27)
	return (1);
    else return (0);
}


pcl (argc, argv)
    int argc; char **argv;
/*
 * Parse command line and set option variables
 */
{
    int n;

    argc--;
    argv++;
    n = getopts (argc, argv);
    DBG(fprintf(dfp,"getopts => %d, argc %d\n",n,argc);)
    argc -= n;
    argv += n;
    if (nfiles = argc) nextf = argv;
}

getopts (argc, argv)
    int argc; char **argv;
/*
 * Set option variables according to the command line given in argc/argv.
 * Return number of arguments processed.
 */
{
    int cnt;
    char *p;

    cnt = argc;
    while (argc) {
	DBG(fprintf(dfp,"Processing %d %s\n",argc,*argv);)
        p = *argv++; argc--;
	if (*p == '-') {		/* found a switch */
	    p++;
	    while (*p) dodash (*p++);
	} else if (p[1] == '=') {
	    casecvt(p[0]);
	    if (p[0] == 'h') {		/* collect header string */
		char delim, *h, c;
		p += 2;
		delim = *p++;
		h = header;
		while ((c = *p++) != delim) {
		    if (c == EOS) {
			if (argc == 0)
			     Abort ("No terminating quote in h=");
			p = *argv++; argc--;
			*h++ = SP;	/* end of a substring in the
					 * command line before end of
					 * the end of the header is
					 * turned into a blank.
					 */
		    }
		    else *h++ = c;
		}
		*h++ = EOS;
	    }
	    else doequal (p);		/* found a keyword */
	} else {
	    argc++; argv--;
	    break;			/* file names follow */
	}
    }
    return (cnt - argc);
}


dodash (c)
    char c;
/*
 *  Process dash option given by c
 */
{
    casecvt(c);
    DBG(fprintf(dfp,"dodash(%c)\n",c);)
    switch (c) {
      case 'a': altset++; break;
      case 'c': cchar++; break;
      case 'f': ffeed++; break;
      case 'h': nohead++; break;
      case 'i': intl++; break;
      case 'o': trunc++; break;
      case 'p': pagpaus++; break;
      case 's': nopcc++; break;
      case '1': nopage1++; break;
      case '8': space8++; break;
      default:
	Abort ("unrecognized switch option -%c",c);
    }
}


doequal (s)
    char *s;
/*
 * Process a keyword=value option given by string s.  Notice that there
 * is no checking on the bounds of the values accepted by the
 * parameters, although there certainly ought to be.
 */
{
    char c;

    c = *s;
    casecvt(c);
    s += 2;
    switch (c) {
      case 'b': tabspaces = atoi(s); break;
      case 'c': cmode = country(s); break;
      case 'f': optfile (s); break;
      case 'l': lpp = atoi(s); break;
      case 'm': leftmar = atoi(s); break;
      case 'o': strcpy(outfile,s); break;
      case 'p': pmode = getpmode (s); break;
      case 'q': qmode = getpmode (s); break;
      case 't': topmar = atoi(s); break;
      case 'w': cpl = atoi(s); break;
      default:
	Abort ("unrecognized keyword %c=",c);
    }
}

country (s)
    char *s;
/*
 * Matches string s against the list of country mnemonics and, if a
 * match is found, returns the corresponding country code.  Otherwise,
 * returns 0 (default for USA).  Only the first two characters of s
 * are significant.
 */
{
    int n;
    char **p;

    casecvt(s[0]); casecvt(s[1]);	/* make lower case */
    for (n = 0, p = cntries; *p; n++, p++) {
	if (s[0] == (*p)[0] && s[1] == (*p)[1]) break;
    }
    if (*p == NULL) n = 0;
    return (n);
}


getpmode (s)
    char *s;
/*
 * Constructs the printer mode from the string s and returns it.
 */
{
    int n;
    char c;

    n = 0;
    while (*s) {
	c = *s;
	casecvt(c);
	switch (c) {
	  case 'b': n |= F_b; break;	/* bold (ie, emphasized) */
	  case 'c': n |= F_c; break;	/* condensed */
	  case 'd': n |= F_d; break;	/* double strike */
	  case 'e': n |= F_e; break;	/* enlarged */
	  case 'i': n |= F_i; break;	/* italic */
	  case 'l': n |= F_l; break;	/* elite */
	  case 'p': n |= F_p; break;	/* proportional */
	  case 's': n |= F_s; break;	/* subscript */
	  case 't': n |= F_t; break;	/* top (superscript) */
	  case 'u': n |= F_u; break;	/* underlined */
	  default:
	    Abort ("invalid printer mode specifier %c", *s);
	}
	s++;
    }
    return (n);
}

respmode(n)
    int n;				/* The user's mode spec. */
/*
 *	Resolve a printer mode spec by applying the Epson FX-80
 * priority rules.  In the descriptions below, "->" means overrides.
 */
{
    /* Elite -> Proportional -> Emphasized -> Compressed */
    if (n & F_l) n &= ~(F_p|F_b|F_c);
    if (n & F_p) n &= ~(F_b|F_c);
    if (n & F_b) n &= ~(F_c);

    /* Proportional -> (Superscript, Subscript, Double Strike) */
    if (n & F_p) n &= ~(F_t|F_s|F_d);

    /*
     * Superscript and Subscript are exclusive.  This program (not
     * the Epson FX-80) will give Subscript priority.
     */
    if (n & F_s) n &= ~(F_t);

    /* Superscript and Subscript imply Double Strike */
    if (n & (F_t|F_s)) n |= F_d;

    return (n);				/* Return the resolved mode. */
}

optfile (filnam)
    char *filnam;
/*
 * Found f=filnam option.  Take options from given file, make them
 * appear like command line (build an argc and argv vector), and call
 * getopts on the result.
 */
{
    FILE *fp;
    char buf[160], *p, *argv[16];
    int c;
    int argc;

    fp = fopen (filnam, "r");
    if (fp == NULL) {
	fprintf (stderr, "File %s not found. ",filnam);
	Abort ("Cannot process f= option.");
    }
    DBG(fprintf(dfp,"Indirect file %s\n",filnam);)
    for (p = buf, argc = 0, c = 0; c != EOF; ) {
	do c = getc (fp); while (isspace(c));	/* skip blanks */
	if (c == EOF) break;
	argv[argc++] = p;		/* next argument */
	do {				/* save argument */
	    *p++ = c;
	    c = getc(fp);
	} while (!isspace(c) && c != EOF);
	*p++ = EOS;
	DBG(fprintf(dfp,"Arg %d is '%s'\n",argc,argv[argc-1]);)
	if (c == EOF) break;
    }
    DBG(fprintf(dfp,"EOF on optfile\n");)
    fclose (fp);
    getopts (argc, argv);
}