io.c

早期freebsd实现

/*
 * Copyright (C) 1976 by the Board of Trustees of the University of Illinois
 * 
 * All rights reserved
 * 
 * 
 * NAME: fill_buffer
 * 
 * FUNCTION: Reads one block of input into input_buffer
 * 
 * HISTORY: initial coding 	November 1976	D A Willcox of CAC 1/7/77 A
 * Willcox of CAC	Added check for switch back to partly full input
 * buffer from temporary buffer
 * 
 */
int
fill_buffer()
{				/* this routine reads stuff from the input */
    register char *p;
    register int i;
    register FILE *f = input;

    if (bp_save != 0) {		/* there is a partly filled input buffer left */
	buf_ptr = bp_save;	/* dont read anything, just switch buffers */
	buf_end = be_save;
	bp_save = be_save = 0;
	if (buf_ptr < buf_end)
	    return;		/* only return if there is really something in
				 * this buffer */
    }
    for (p = in_buffer;;) {
	if (p >= in_buffer_limit) {
	    register size = (in_buffer_limit - in_buffer) * 2 + 10;
	    register offset = p - in_buffer;
	    in_buffer = (char *) realloc(in_buffer, size);
	    if (in_buffer == 0)
		err("input line too long");
	    p = in_buffer + offset;
	    in_buffer_limit = in_buffer + size - 2;
	}
	if ((i = getc(f)) == EOF) {
		*p++ = ' ';
		*p++ = '\n';
		had_eof = true;
		break;
	}
	*p++ = i;
	if (i == '\n')
		break;
    }
    buf_ptr = in_buffer;
    buf_end = p;
    if (p[-2] == '/' && p[-3] == '*') {
	if (in_buffer[3] == 'I' && strncmp(in_buffer, "/**INDENT**", 11) == 0)
	    fill_buffer();	/* flush indent error message */
	else {
	    int         com = 0;

	    p = in_buffer;
	    while (*p == ' ' || *p == '\t')
		p++;
	    if (*p == '/' && p[1] == '*') {
		p += 2;
		while (*p == ' ' || *p == '\t')
		    p++;
		if (p[0] == 'I' && p[1] == 'N' && p[2] == 'D' && p[3] == 'E'
			&& p[4] == 'N' && p[5] == 'T') {
		    p += 6;
		    while (*p == ' ' || *p == '\t')
			p++;
		    if (*p == '*')
			com = 1;
		    else if (*p == 'O')
			if (*++p == 'N')
			    p++, com = 1;
			else if (*p == 'F' && *++p == 'F')
			    p++, com = 2;
		    while (*p == ' ' || *p == '\t')
			p++;
		    if (p[0] == '*' && p[1] == '/' && p[2] == '\n' && com) {
			if (s_com != e_com || s_lab != e_lab || s_code != e_code)
			    dump_line();
			if (!(inhibit_formatting = com - 1)) {
			    n_real_blanklines = 0;
			    postfix_blankline_requested = 0;
			    prefix_blankline_requested = 0;
			    suppress_blanklines = 1;
			}
		    }
		}
	    }
	}
    }
    if (inhibit_formatting) {
	p = in_buffer;
	do
	    putc(*p, output);
	while (*p++ != '\n');
    }
    return;
}

/*
 * Copyright (C) 1976 by the Board of Trustees of the University of Illinois
 * 
 * All rights reserved
 * 
 * 
 * NAME: pad_output
 * 
 * FUNCTION: Writes tabs and spaces to move the current column up to the desired
 * position.
 * 
 * ALGORITHM: Put tabs and/or blanks into pobuf, then write pobuf.
 * 
 * PARAMETERS: current		integer		The current column target
 * nteger		The desired column
 * 
 * RETURNS: Integer value of the new column.  (If current >= target, no action is
 * taken, and current is returned.
 * 
 * GLOBALS: None
 * 
 * CALLS: write (sys)
 * 
 * CALLED BY: dump_line
 * 
 * HISTORY: initial coding 	November 1976	D A Willcox of CAC
 * 
 */
pad_output(current, target)	/* writes tabs and blanks (if necessary) to
				 * get the current output position up to the
				 * target column */
    int         current;	/* the current column value */
    int         target;		/* position we want it at */
{
    register int curr;		/* internal column pointer */
    register int tcur;

    if (troff)
	fprintf(output, "\\h'|%dp'", (target - 1) * 7);
    else {
	if (current >= target)
	    return (current);	/* line is already long enough */
	curr = current;
	while ((tcur = ((curr - 1) & tabmask) + tabsize + 1) <= target) {
	    putc('\t', output);
	    curr = tcur;
	}
	while (curr++ < target)
	    putc(' ', output);	/* pad with final blanks */
    }
    return (target);
}

/*
 * Copyright (C) 1976 by the Board of Trustees of the University of Illinois
 * 
 * All rights reserved
 * 
 * 
 * NAME: count_spaces
 * 
 * FUNCTION: Find out where printing of a given string will leave the current
 * character position on output.
 * 
 * ALGORITHM: Run thru input string and add appropriate values to current
 * position.
 * 
 * RETURNS: Integer value of position after printing "buffer" starting in column
 * "current".
 * 
 * HISTORY: initial coding 	November 1976	D A Willcox of CAC
 * 
 */
int
count_spaces(current, buffer)
/*
 * this routine figures out where the character position will be after
 * printing the text in buffer starting at column "current"
 */
    int         current;
    char       *buffer;
{
    register char *buf;		/* used to look thru buffer */
    register int cur;		/* current character counter */

    cur = current;

    for (buf = buffer; *buf != '\0'; ++buf) {
	switch (*buf) {

	case '\n':
	case 014:		/* form feed */
	    cur = 1;
	    break;

	case '\t':
	    cur = ((cur - 1) & tabmask) + tabsize + 1;
	    break;

	case 010:		/* backspace */
	    --cur;
	    break;

	default:
	    ++cur;
	    break;
	}			/* end of switch */
    }				/* end of for loop */
    return (cur);
}

int	found_err;
/* VARARGS2 */
diag(level, msg, a, b)
	char *msg;
{
    if (level)
	found_err = 1;
    if (output == stdout) {
	fprintf(stdout, "/**INDENT** %s@%d: ", level == 0 ? "Warning" : "Error", line_no);
	fprintf(stdout, msg, a, b);
	fprintf(stdout, " */\n");
    }
    else {
	fprintf(stderr, "%s@%d: ", level == 0 ? "Warning" : "Error", line_no);
	fprintf(stderr, msg, a, b);
	fprintf(stderr, "\n");
    }
}

writefdef(f, nm)
    register struct fstate *f;
{
    fprintf(output, ".ds f%c %s\n.nr s%c %d\n",
	    nm, f->font, nm, f->size);
}

char       *
chfont(of, nf, s)
    register struct fstate *of,
               *nf;
    char       *s;
{
    if (of->font[0] != nf->font[0]
	    || of->font[1] != nf->font[1]) {
	*s++ = '\\';
	*s++ = 'f';
	if (nf->font[1]) {
	    *s++ = '(';
	    *s++ = nf->font[0];
	    *s++ = nf->font[1];
	}
	else
	    *s++ = nf->font[0];
    }
    if (nf->size != of->size) {
	*s++ = '\\';
	*s++ = 's';
	if (nf->size < of->size) {
	    *s++ = '-';
	    *s++ = '0' + of->size - nf->size;
	}
	else {
	    *s++ = '+';
	    *s++ = '0' + nf->size - of->size;
	}
    }
    return s;
}


parsefont(f, s0)
    register struct fstate *f;
    char       *s0;
{
    register char *s = s0;
    int         sizedelta = 0;
    bzero(f, sizeof *f);
    while (*s) {
	if (isdigit(*s))
	    f->size = f->size * 10 + *s - '0';
	else if (isupper(*s))
	    if (f->font[0])
		f->font[1] = *s;
	    else
		f->font[0] = *s;
	else if (*s == 'c')
	    f->allcaps = 1;
	else if (*s == '+')
	    sizedelta++;
	else if (*s == '-')
	    sizedelta--;
	else {
	    fprintf(stderr, "indent: bad font specification: %s\n", s0);
	    exit(1);
	}
	s++;
    }
    if (f->font[0] == 0)
	f->font[0] = 'R';
    if (bodyf.size == 0)
	bodyf.size = 11;
    if (f->size == 0)
	f->size = bodyf.size + sizedelta;
    else if (sizedelta > 0)
	f->size += bodyf.size;
    else
	f->size = bodyf.size - f->size;
}