FreeBSD-5.3/usr.bin/m4/misc.c
/* $OpenBSD: misc.c,v 1.27 2002/04/26 16:15:16 espie Exp $ */
/* $NetBSD: misc.c,v 1.6 1995/09/28 05:37:41 tls Exp $ */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ozan Yigit at York University.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)misc.c 8.1 (Berkeley) 6/6/93";
#else
#if 0
static char rcsid[] = "$OpenBSD: misc.c,v 1.27 2002/04/26 16:15:16 espie Exp $";
#endif
#endif
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/usr.bin/m4/misc.c,v 1.15 2002/07/15 02:15:12 jmallett Exp $");
#include <sys/types.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <err.h>
#include "mdef.h"
#include "stdd.h"
#include "extern.h"
#include "pathnames.h"
char *ep; /* first free char in strspace */
static char *strspace; /* string space for evaluation */
char *endest; /* end of string space */
static size_t strsize = STRSPMAX;
static size_t bufsize = BUFSIZE;
char *buf; /* push-back buffer */
char *bufbase; /* the base for current ilevel */
char *bbase[MAXINP]; /* the base for each ilevel */
char *bp; /* first available character */
char *endpbb; /* end of push-back buffer */
/*
* find the index of second str in the first str.
*/
ptrdiff_t
indx(const char *s1, const char *s2)
{
char *t;
t = strstr(s1, s2);
if (t == NULL)
return (-1);
else
return (t - s1);
}
/*
* putback - push character back onto input
*/
void
putback(int c)
{
if (c == EOF)
return;
if (bp >= endpbb)
enlarge_bufspace();
*bp++ = c;
}
/*
* pbstr - push string back onto input
* putback is replicated to improve
* performance.
*/
void
pbstr(const char *s)
{
size_t n;
n = strlen(s);
while ((size_t)(endpbb - bp) <= n)
enlarge_bufspace();
while (n > 0)
*bp++ = s[--n];
}
/*
* pbnum - convert number to string, push back on input.
*/
void
pbnum(int n)
{
int num;
num = (n < 0) ? -n : n;
do {
putback(num % 10 + '0');
}
while ((num /= 10) > 0);
if (n < 0)
putback('-');
}
/*
* pbunsigned - convert unsigned long to string, push back on input.
*/
void
pbunsigned(unsigned long n)
{
do {
putback(n % 10 + '0');
}
while ((n /= 10) > 0);
}
void
initspaces(void)
{
int i;
strspace = xalloc(strsize+1);
ep = strspace;
endest = strspace+strsize;
buf = (char *)xalloc(bufsize);
bufbase = buf;
bp = buf;
endpbb = buf + bufsize;
for (i = 0; i < MAXINP; i++)
bbase[i] = buf;
}
void
enlarge_strspace(void)
{
char *newstrspace;
int i;
strsize *= 2;
newstrspace = malloc(strsize + 1);
if (!newstrspace)
errx(1, "string space overflow");
memcpy(newstrspace, strspace, strsize/2);
for (i = 0; i <= sp; i++)
if (sstack[i])
mstack[i].sstr = (mstack[i].sstr - strspace)
+ newstrspace;
ep = (ep-strspace) + newstrspace;
free(strspace);
strspace = newstrspace;
endest = strspace + strsize;
}
void
enlarge_bufspace(void)
{
char *newbuf;
int i;
bufsize *= 2;
newbuf = realloc(buf, bufsize);
if (!newbuf)
errx(1, "too many characters pushed back");
for (i = 0; i < MAXINP; i++)
bbase[i] = (bbase[i]-buf)+newbuf;
bp = (bp-buf)+newbuf;
bufbase = (bufbase-buf)+newbuf;
buf = newbuf;
endpbb = buf+bufsize;
}
/*
* chrsave - put single char on string space
*/
void
chrsave(int c)
{
if (ep >= endest)
enlarge_strspace();
*ep++ = c;
}
/*
* read in a diversion file, and dispose it.
*/
void
getdiv(int n)
{
int c;
if (active == outfile[n])
errx(1, "undivert: diversion still active");
rewind(outfile[n]);
while ((c = getc(outfile[n])) != EOF)
putc(c, active);
(void) fclose(outfile[n]);
outfile[n] = NULL;
}
void
onintr(int signo __unused)
{
#define intrmessage "m4: interrupted.\n"
write(STDERR_FILENO, intrmessage, sizeof(intrmessage)-1);
_exit(1);
}
/*
* killdiv - get rid of the diversion files
*/
void
killdiv(void)
{
int n;
for (n = 0; n < maxout; n++)
if (outfile[n] != NULL) {
(void) fclose(outfile[n]);
}
}
/*
* resizedivs: allocate more diversion files */
void
resizedivs(int n)
{
int i;
outfile = (FILE **)realloc(outfile, sizeof(FILE *) * n);
if (outfile == NULL)
errx(1, "too many diverts %d", n);
for (i = maxout; i < n; i++)
outfile[i] = NULL;
maxout = n;
}
void *
xalloc(size_t n)
{
char *p = malloc(n);
if (p == NULL)
err(1, "malloc");
return p;
}
char *
xstrdup(const char *s)
{
char *p = strdup(s);
if (p == NULL)
err(1, "strdup");
return p;
}
void
usage(void)
{
fprintf(stderr,
"usage: m4 [-d flags] [-t name] [-gs] [-D name[=value]]...\n"
" [-U name]... [-I dirname]... file...\n");
exit(1);
}
int
obtain_char(struct input_file *f)
{
if (f->c == EOF)
return EOF;
else if (f->c == '\n')
f->lineno++;
f->c = fgetc(f->file);
return f->c;
}
void
set_input(struct input_file *f, FILE *real, const char *name)
{
f->file = real;
f->lineno = 1;
f->c = 0;
f->name = xstrdup(name);
}
void
release_input(struct input_file *f)
{
if (f->file != stdin)
fclose(f->file);
f->c = EOF;
/*
* XXX can't free filename, as there might still be
* error information pointing to it.
*/
}
void
doprintlineno(struct input_file *f)
{
pbunsigned(f->lineno);
}
void
doprintfilename(struct input_file *f)
{
pbstr(rquote);
pbstr(f->name);
pbstr(lquote);
}
/*
* buffer_mark/dump_buffer: allows one to save a mark in a buffer,
* and later dump everything that was added since then to a file.
*/
size_t
buffer_mark(void)
{
return bp - buf;
}
void
dump_buffer(FILE *f, size_t m)
{
char *s;
for (s = bp; s - buf > (int)m;)
fputc(*--s, f);
}