106 lines
1.9 KiB
C
106 lines
1.9 KiB
C
/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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/* $Id$ */
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/* PREPROCESSOR: INPUT SKIP FUNCTIONS */
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#include "LLlex.h"
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#include "class.h"
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#include "input.h"
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int
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skipspaces(ch, skipnl)
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register int ch;
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{
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/* skipspaces() skips any white space and returns the first
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non-space character.
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*/
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register int nlseen = 0;
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for (;;) {
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while (class(ch) == STSKIP) {
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nlseen = 0;
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LoadChar(ch);
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}
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if (skipnl && class(ch) == STNL) {
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LoadChar(ch);
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++LineNumber;
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nlseen++;
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continue;
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}
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/* How about "\\\n"????????? */
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if (ch == '/') {
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LoadChar(ch);
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if (ch == '*') {
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skipcomment();
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LoadChar(ch);
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}
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else {
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PushBack();
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return '/';
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}
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}
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else if (nlseen && ch == '#') {
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domacro();
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LoadChar(ch);
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/* ch is the first character of a line. This means
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* that nlseen will still be true.
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*/
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} else
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return ch;
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}
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}
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skipline()
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{
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/* skipline() skips all characters until a newline character
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is seen, not escaped by a '\\'.
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Any comment is skipped.
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*/
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register int c;
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LoadChar(c);
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while (class(c) != STNL && c != EOI) {
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if (class(c) == STSTR || class(c) == STCHAR) {
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register int stopc = c;
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int escaped;
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do {
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escaped = 0;
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LoadChar(c);
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if (class(c) == STNL || c == EOI) {
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break;
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}
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if (c == '\\') {
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LoadChar(c);
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if (c == '\n') {
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++LineNumber;
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}
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else escaped = 1;
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}
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} while (escaped || c != stopc);
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if (class(c) != STNL && c != EOI) {
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LoadChar(c);
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}
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continue;
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}
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if (c == '\\') {
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LoadChar(c);
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if (class(c) == STNL)
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++LineNumber;
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}
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if (c == '/') {
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LoadChar(c);
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if (c == '*')
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skipcomment();
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else
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continue;
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}
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LoadChar(c);
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}
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++LineNumber;
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if (c == EOI) { /* garbage input... */
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error("unexpected EOF while skipping text");
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PushBack();
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}
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}
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