521 lines
11 KiB
C
521 lines
11 KiB
C
/* $OpenBSD: gnum4.c,v 1.18 2002/04/26 16:15:16 espie Exp $ */
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/*
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* Copyright (c) 1999 Marc Espie
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* functions needed to support gnu-m4 extensions, including a fake freezing
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*/
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <ctype.h>
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#include <paths.h>
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#include <regex.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <err.h>
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#include <errno.h>
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#include <unistd.h>
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#include "mdef.h"
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#include "stdd.h"
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#include "extern.h"
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int mimic_gnu = 0;
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/*
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* Support for include path search
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* First search in the the current directory.
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* If not found, and the path is not absolute, include path kicks in.
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* First, -I options, in the order found on the command line.
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* Then M4PATH env variable
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*/
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struct path_entry {
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char *name;
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struct path_entry *next;
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} *first, *last;
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static struct path_entry *new_path_entry(const char *);
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static void ensure_m4path(void);
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static struct input_file *dopath(struct input_file *, const char *);
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static struct path_entry *
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new_path_entry(const char *dirname)
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{
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struct path_entry *n;
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n = malloc(sizeof(struct path_entry));
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if (!n)
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errx(1, "out of memory");
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n->name = strdup(dirname);
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if (!n->name)
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errx(1, "out of memory");
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n->next = 0;
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return n;
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}
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void
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addtoincludepath(const char *dirname)
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{
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struct path_entry *n;
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n = new_path_entry(dirname);
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if (last) {
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last->next = n;
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last = n;
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}
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else
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last = first = n;
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}
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static void
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ensure_m4path()
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{
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static int envpathdone = 0;
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char *envpath;
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char *sweep;
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char *path;
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if (envpathdone)
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return;
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envpathdone = TRUE;
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envpath = getenv("M4PATH");
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if (!envpath)
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return;
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/* for portability: getenv result is read-only */
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envpath = strdup(envpath);
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if (!envpath)
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errx(1, "out of memory");
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for (sweep = envpath;
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(path = strsep(&sweep, ":")) != NULL;)
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addtoincludepath(path);
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free(envpath);
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}
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static
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struct input_file *
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dopath(struct input_file *i, const char *filename)
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{
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char path[MAXPATHLEN];
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struct path_entry *pe;
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FILE *f;
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for (pe = first; pe; pe = pe->next) {
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snprintf(path, sizeof(path), "%s/%s", pe->name, filename);
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if ((f = fopen(path, "r")) != 0) {
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set_input(i, f, path);
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return i;
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}
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}
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return NULL;
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}
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struct input_file *
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fopen_trypath(struct input_file *i, const char *filename)
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{
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FILE *f;
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f = fopen(filename, "r");
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if (f != NULL) {
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set_input(i, f, filename);
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return i;
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}
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if (filename[0] == '/')
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return NULL;
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ensure_m4path();
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return dopath(i, filename);
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}
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void
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doindir(const char *argv[], int argc)
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{
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ndptr p;
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p = lookup(argv[2]);
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if (p == NULL)
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errx(1, "undefined macro %s", argv[2]);
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argv[1] = p->defn;
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eval(argv+1, argc-1, p->type);
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}
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void
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dobuiltin(const char *argv[], int argc)
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{
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int n;
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argv[1] = NULL;
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n = builtin_type(argv[2]);
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if (n != -1)
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eval(argv+1, argc-1, n);
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else
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errx(1, "unknown builtin %s", argv[2]);
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}
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/* We need some temporary buffer space, as pb pushes BACK and substitution
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* proceeds forward... */
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static char *buffer;
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static size_t bufsize = 0;
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static size_t current = 0;
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static void addchars(const char *, size_t);
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static void addchar(int);
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static char *twiddle(const char *);
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static char *getstring(void);
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static void exit_regerror(int, regex_t *);
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static void do_subst(const char *, regex_t *, const char *, regmatch_t *);
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static void do_regexpindex(const char *, regex_t *, regmatch_t *);
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static void do_regexp(const char *, regex_t *, const char *, regmatch_t *);
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static void add_sub(size_t, const char *, regex_t *, regmatch_t *);
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static void add_replace(const char *, regex_t *, const char *, regmatch_t *);
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#define addconstantstring(s) addchars((s), sizeof(s)-1)
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static void
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addchars(const char *c, size_t n)
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{
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if (n == 0)
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return;
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while (current + n > bufsize) {
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if (bufsize == 0)
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bufsize = 1024;
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else
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bufsize *= 2;
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buffer = realloc(buffer, bufsize);
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if (buffer == NULL)
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errx(1, "out of memory");
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}
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memcpy(buffer+current, c, n);
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current += n;
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}
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static void
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addchar(int c)
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{
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if (current +1 > bufsize) {
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if (bufsize == 0)
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bufsize = 1024;
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else
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bufsize *= 2;
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buffer = realloc(buffer, bufsize);
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if (buffer == NULL)
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errx(1, "out of memory");
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}
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buffer[current++] = c;
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}
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static char *
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getstring()
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{
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addchar('\0');
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current = 0;
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return buffer;
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}
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static void
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exit_regerror(int er, regex_t *re)
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{
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size_t errlen;
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char *errbuf;
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errlen = regerror(er, re, NULL, 0);
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errbuf = xalloc(errlen);
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regerror(er, re, errbuf, errlen);
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errx(1, "regular expression error: %s", errbuf);
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}
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static void
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add_sub(size_t n, const char *string, regex_t *re, regmatch_t *pm)
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{
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if (n > re->re_nsub)
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warnx("No subexpression %zu", n);
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/* Subexpressions that did not match are
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* not an error. */
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else if (pm[n].rm_so != -1 &&
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pm[n].rm_eo != -1) {
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addchars(string + pm[n].rm_so,
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pm[n].rm_eo - pm[n].rm_so);
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}
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}
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/* Add replacement string to the output buffer, recognizing special
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* constructs and replacing them with substrings of the original string.
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*/
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static void
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add_replace(const char *string, regex_t *re, const char *replace, regmatch_t *pm)
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{
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const char *p;
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for (p = replace; *p != '\0'; p++) {
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if (*p == '&' && !mimic_gnu) {
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add_sub(0, string, re, pm);
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continue;
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}
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if (*p == '\\') {
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if (p[1] == '\\') {
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addchar(p[1]);
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p++;
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continue;
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}
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if (p[1] == '&') {
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if (mimic_gnu)
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add_sub(0, string, re, pm);
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else
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addchar(p[1]);
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p++;
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continue;
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}
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if (isdigit(p[1])) {
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add_sub(*(++p) - '0', string, re, pm);
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continue;
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}
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}
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addchar(*p);
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}
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}
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static void
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do_subst(const char *string, regex_t *re, const char *replace, regmatch_t *pm)
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{
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int error;
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int flags = 0;
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const char *last_match = NULL;
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while ((error = regexec(re, string, re->re_nsub+1, pm, flags)) == 0) {
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if (pm[0].rm_eo != 0) {
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if (string[pm[0].rm_eo-1] == '\n')
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flags = 0;
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else
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flags = REG_NOTBOL;
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}
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/* NULL length matches are special... We use the `vi-mode'
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* rule: don't allow a NULL-match at the last match
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* position.
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*/
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if (pm[0].rm_so == pm[0].rm_eo &&
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string + pm[0].rm_so == last_match) {
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if (*string == '\0')
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return;
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addchar(*string);
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if (*string++ == '\n')
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flags = 0;
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else
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flags = REG_NOTBOL;
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continue;
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}
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last_match = string + pm[0].rm_so;
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addchars(string, pm[0].rm_so);
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add_replace(string, re, replace, pm);
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string += pm[0].rm_eo;
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}
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if (error != REG_NOMATCH)
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exit_regerror(error, re);
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pbstr(string);
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}
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static void
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do_regexp(const char *string, regex_t *re, const char *replace, regmatch_t *pm)
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{
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int error;
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switch(error = regexec(re, string, re->re_nsub+1, pm, 0)) {
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case 0:
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add_replace(string, re, replace, pm);
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pbstr(getstring());
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break;
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case REG_NOMATCH:
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break;
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default:
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exit_regerror(error, re);
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}
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}
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static void
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do_regexpindex(const char *string, regex_t *re, regmatch_t *pm)
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{
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int error;
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switch(error = regexec(re, string, re->re_nsub+1, pm, 0)) {
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case 0:
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pbunsigned(pm[0].rm_so);
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break;
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case REG_NOMATCH:
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pbnum(-1);
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break;
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default:
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exit_regerror(error, re);
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}
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}
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/* In Gnu m4 mode, parentheses for backmatch don't work like POSIX 1003.2
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* says. So we twiddle with the regexp before passing it to regcomp.
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*/
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static char *
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twiddle(const char *p)
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{
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/* This could use strcspn for speed... */
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while (*p != '\0') {
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if (*p == '\\') {
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switch(p[1]) {
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case '(':
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case ')':
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case '|':
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addchar(p[1]);
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break;
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case 'w':
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addconstantstring("[_a-zA-Z0-9]");
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break;
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case 'W':
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addconstantstring("[^_a-zA-Z0-9]");
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break;
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case '<':
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addconstantstring("[[:<:]]");
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break;
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case '>':
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addconstantstring("[[:>:]]");
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break;
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default:
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addchars(p, 2);
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break;
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}
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p+=2;
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continue;
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}
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if (*p == '(' || *p == ')' || *p == '|')
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addchar('\\');
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addchar(*p);
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p++;
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}
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return getstring();
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}
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/* patsubst(string, regexp, opt replacement) */
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/* argv[2]: string
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* argv[3]: regexp
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* argv[4]: opt rep
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*/
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void
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dopatsubst(const char *argv[], int argc)
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{
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int error;
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regex_t re;
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regmatch_t *pmatch;
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if (argc <= 3) {
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warnx("Too few arguments to patsubst");
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return;
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}
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error = regcomp(&re, mimic_gnu ? twiddle(argv[3]) : argv[3],
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REG_NEWLINE | REG_EXTENDED);
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if (error != 0)
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exit_regerror(error, &re);
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pmatch = xalloc(sizeof(regmatch_t) * (re.re_nsub+1));
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do_subst(argv[2], &re,
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argc != 4 && argv[4] != NULL ? argv[4] : "", pmatch);
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pbstr(getstring());
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free(pmatch);
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regfree(&re);
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}
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void
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doregexp(const char *argv[], int argc)
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{
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int error;
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regex_t re;
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regmatch_t *pmatch;
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if (argc <= 3) {
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warnx("Too few arguments to regexp");
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return;
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}
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error = regcomp(&re, mimic_gnu ? twiddle(argv[3]) : argv[3],
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REG_EXTENDED);
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if (error != 0)
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exit_regerror(error, &re);
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pmatch = xalloc(sizeof(regmatch_t) * (re.re_nsub+1));
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if (argv[4] == NULL || argc == 4)
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do_regexpindex(argv[2], &re, pmatch);
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else
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do_regexp(argv[2], &re, argv[4], pmatch);
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free(pmatch);
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regfree(&re);
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}
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void
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doesyscmd(const char *cmd)
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{
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int p[2];
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pid_t pid, cpid;
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int cc;
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int status;
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/* Follow gnu m4 documentation: first flush buffers. */
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fflush(NULL);
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/* Just set up standard output, share stderr and stdin with m4 */
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if (pipe(p) == -1)
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err(1, "bad pipe");
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switch(cpid = fork()) {
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case -1:
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err(1, "bad fork");
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/* NOTREACHED */
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case 0:
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(void) close(p[0]);
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(void) dup2(p[1], 1);
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(void) close(p[1]);
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execl(_PATH_BSHELL, "sh", "-c", cmd, NULL);
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exit(1);
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default:
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/* Read result in two stages, since m4's buffer is
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* pushback-only. */
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(void) close(p[1]);
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do {
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char result[BUFSIZE];
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cc = read(p[0], result, sizeof result);
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if (cc > 0)
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addchars(result, cc);
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} while (cc > 0 || (cc == -1 && errno == EINTR));
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(void) close(p[0]);
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while ((pid = wait(&status)) != cpid && pid >= 0)
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continue;
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pbstr(getstring());
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}
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}
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