287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov/* $NetBSD: fparseln.c,v 1.9 1999/09/20 04:48:06 lukem Exp $ */
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov/*
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * Copyright (c) 1997 Christos Zoulas. All rights reserved.
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov *
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * Redistribution and use in source and binary forms, with or without
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * modification, are permitted provided that the following conditions
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * are met:
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * 1. Redistributions of source code must retain the above copyright
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * notice, this list of conditions and the following disclaimer.
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * 2. Redistributions in binary form must reproduce the above copyright
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * notice, this list of conditions and the following disclaimer in the
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * documentation and/or other materials provided with the distribution.
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * 3. All advertising materials mentioning features or use of this software
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * must display the following acknowledgement:
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * This product includes software developed by Christos Zoulas.
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * 4. The name of the author may not be used to endorse or promote products
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * derived from this software without specific prior written permission.
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov *
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov */
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov#include <stdio.h>
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov#include <string.h>
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov#include <stdlib.h>
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov#include <compat.h>
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalovstatic int isescaped(const char *, const char *, int);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov/*
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * isescaped():
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * Return true if the character in *p that belongs to a string
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * that starts in *sp, is escaped by the escape character esc.
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov */
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalovstatic int
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalovisescaped(const char *sp, const char *p, int esc)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov{
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov const char *cp;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov size_t ne;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov /* No escape character */
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov if (esc == '\0')
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov return (1);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov /* Count the number of escape characters that precede ours */
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov for (ne = 0, cp = p; --cp >= sp && *cp == esc; ne++)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov continue;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov /* Return true if odd number of escape characters */
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov return ((ne & 1) != 0);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov}
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov/*
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * fparseln():
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * Read a line from a file parsing continuations ending in \
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * and eliminating trailing newlines, or comments starting with
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * the comment char.
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov */
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalovchar *
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalovfparseln(FILE *fp, size_t *size, size_t *lineno, const char str[3], int flags)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov{
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov static const char dstr[3] = { '\\', '\\', '#' };
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov size_t s, len;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov char *buf;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov char *ptr, *cp;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov int cnt;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov char esc, con, nl, com;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov len = 0;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov buf = NULL;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov cnt = 1;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov if (str == NULL)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov str = dstr;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov esc = str[0];
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov con = str[1];
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov com = str[2];
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov /*
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * XXX: it would be cool to be able to specify the newline character,
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * but unfortunately, fgetln does not let us
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov */
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov nl = '\n';
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov while (cnt) {
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov cnt = 0;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov if (lineno)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov (*lineno)++;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov if ((ptr = fgetln(fp, &s)) == NULL)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov break;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov if (s && com) { /* Check and eliminate comments */
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov for (cp = ptr; cp < ptr + s; cp++)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov if (*cp == com && !isescaped(ptr, cp, esc)) {
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov s = cp - ptr;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov cnt = s == 0 && buf == NULL;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov break;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov }
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov }
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov if (s && nl) { /* Check and eliminate newlines */
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov cp = &ptr[s - 1];
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov if (*cp == nl)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov s--; /* forget newline */
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov }
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov if (s && con) { /* Check and eliminate continuations */
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov cp = &ptr[s - 1];
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov if (*cp == con && !isescaped(ptr, cp, esc)) {
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov s--; /* forget escape */
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov cnt = 1;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov }
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov }
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov if (s == 0 && buf != NULL)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov continue;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov if ((cp = realloc(buf, len + s + 1)) == NULL) {
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov free(buf);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov return (NULL);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov }
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov buf = cp;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov (void) memcpy(buf + len, ptr, s);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov len += s;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov buf[len] = '\0';
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov }
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov if ((flags & FPARSELN_UNESCALL) != 0 && esc && buf != NULL &&
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov strchr(buf, esc) != NULL) {
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov ptr = cp = buf;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov while (cp[0] != '\0') {
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov int skipesc;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov while (cp[0] != '\0' && cp[0] != esc)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov *ptr++ = *cp++;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov if (cp[0] == '\0' || cp[1] == '\0')
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov break;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov skipesc = 0;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov if (cp[1] == com)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov skipesc += (flags & FPARSELN_UNESCCOMM);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov if (cp[1] == con)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov skipesc += (flags & FPARSELN_UNESCCONT);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov if (cp[1] == esc)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov skipesc += (flags & FPARSELN_UNESCESC);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov if (cp[1] != com && cp[1] != con && cp[1] != esc)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov skipesc = (flags & FPARSELN_UNESCREST);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov if (skipesc)
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov cp++;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov else
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov *ptr++ = *cp++;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov *ptr++ = *cp++;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov }
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov *ptr = '\0';
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov len = strlen(buf);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov }
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov if (size) {
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov *size = len;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov }
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov return (buf);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov}
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov#ifdef TEST
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalovint
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalovmain(int argc, char *argv[])
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov{
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov char *ptr;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov size_t size, line;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov line = 0;
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov while ((ptr = fparseln(stdin, &size, &line, NULL,
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov FPARSELN_UNESCALL)) != NULL) {
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov printf("line %d (%d) |%s|\n", line, size, ptr);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov }
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov return (0);
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov}
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov/*
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * # This is a test
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * line 1
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * line 2 \
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * line 3 # Comment
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * line 4 \# Not comment \\\\
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov *
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * # And a comment \
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * line 5 \\\
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov * line 6
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov *
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov */
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov
287247a826fa2ab8d01f6c8f276d405eb08420f8Alexander Pyhalov#endif /* TEST */