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NetBSD/usr.bin/sed/main.c

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/* $NetBSD: main.c,v 1.35 2019/10/05 20:22:36 christos Exp $ */
/*-
* Copyright (c) 2013 Johann 'Myrkraverk' Oskarsson.
* Copyright (c) 1992 Diomidis Spinellis.
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Diomidis Spinellis of Imperial College, University of London.
*
* 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. 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.
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
__RCSID("$NetBSD: main.c,v 1.35 2019/10/05 20:22:36 christos Exp $");
#ifdef __FBSDID
__FBSDID("$FreeBSD: head/usr.bin/sed/main.c 252231 2013-06-26 04:14:19Z pfg $");
#endif
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1992, 1993\
The Regents of the University of California. All rights reserved.");
#endif
#if 0
static const char sccsid[] = "@(#)main.c 8.2 (Berkeley) 1/3/94";
#endif
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <limits.h>
#include <locale.h>
#include <regex.h>
#include <stddef.h>
#define _WITH_GETLINE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "defs.h"
#include "extern.h"
/*
* Linked list of units (strings and files) to be compiled
*/
struct s_compunit {
struct s_compunit *next;
enum e_cut {CU_FILE, CU_STRING} type;
char *s; /* Pointer to string or fname */
};
/*
* Linked list pointer to compilation units and pointer to current
* next pointer.
*/
static struct s_compunit *script, **cu_nextp = &script;
/*
* Linked list of files to be processed
*/
struct s_flist {
char *fname;
struct s_flist *next;
};
/*
* Linked list pointer to files and pointer to current
* next pointer.
*/
static struct s_flist *files, **fl_nextp = &files;
FILE *infile; /* Current input file */
FILE *outfile; /* Current output file */
int aflag, eflag, nflag;
int rflags = 0;
static int rval; /* Exit status */
static int ispan; /* Whether inplace editing spans across files */
/*
* Current file and line number; line numbers restart across compilation
* units, but span across input files. The latter is optional if editing
* in place.
*/
const char *fname; /* File name. */
const char *outfname; /* Output file name */
static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */
static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */
static const char *inplace; /* Inplace edit file extension. */
u_long linenum;
static void add_compunit(enum e_cut, char *);
static void add_file(char *);
static void usage(void) __dead;
int
main(int argc, char *argv[])
{
int c, fflag;
char *temp_arg;
setprogname(argv[0]);
(void) setlocale(LC_ALL, "");
fflag = 0;
inplace = NULL;
while ((c = getopt(argc, argv, "EI::ae:f:i::lnru")) != -1)
switch (c) {
case 'r': /* Gnu sed compat */
case 'E':
rflags = REG_EXTENDED;
break;
case 'I':
inplace = optarg ? optarg : __UNCONST("");
ispan = 1; /* span across input files */
break;
case 'a':
aflag = 1;
break;
case 'e':
eflag = 1;
temp_arg = xmalloc(strlen(optarg) + 2);
strcpy(temp_arg, optarg);
strcat(temp_arg, "\n");
add_compunit(CU_STRING, temp_arg);
break;
case 'f':
fflag = 1;
add_compunit(CU_FILE, optarg);
break;
case 'i':
inplace = optarg ? optarg : __UNCONST("");
ispan = 0; /* don't span across input files */
break;
case 'l':
#ifdef _IOLBF
c = setvbuf(stdout, NULL, _IOLBF, 0);
#else
c = setlinebuf(stdout);
#endif
if (c)
warn("setting line buffered output failed");
break;
case 'n':
nflag = 1;
break;
case 'u':
#ifdef _IONBF
c = setvbuf(stdout, NULL, _IONBF, 0);
#else
c = -1;
errno = EOPNOTSUPP;
#endif
if (c)
warn("setting unbuffered output failed");
break;
default:
case '?':
usage();
}
argc -= optind;
argv += optind;
/* First usage case; script is the first arg */
if (!eflag && !fflag && *argv) {
add_compunit(CU_STRING, *argv);
argv++;
}
compile();
/* Continue with first and start second usage */
if (*argv)
for (; *argv; argv++)
add_file(*argv);
else
add_file(NULL);
process();
cfclose(prog, NULL);
if (fclose(stdout))
err(1, "stdout");
exit(rval);
}
static void
usage(void)
{
(void)fprintf(stderr,
"Usage: %s [-aElnru] command [file ...]\n"
"\t%s [-aElnru] [-e command] [-f command_file] [-I[extension]]\n"
"\t [-i[extension]] [file ...]\n", getprogname(), getprogname());
exit(1);
}
/*
* Like fgets, but go through the chain of compilation units chaining them
* together. Empty strings and files are ignored.
*/
char *
cu_fgets(char *buf, int n, int *more)
{
static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
static FILE *f; /* Current open file */
static char *s; /* Current pointer inside string */
static char string_ident[30];
char *p;
again:
switch (state) {
case ST_EOF:
if (script == NULL) {
if (more != NULL)
*more = 0;
return (NULL);
}
linenum = 0;
switch (script->type) {
case CU_FILE:
if ((f = fopen(script->s, "r")) == NULL)
err(1, "%s", script->s);
fname = script->s;
state = ST_FILE;
goto again;
case CU_STRING:
if (((size_t)snprintf(string_ident,
sizeof(string_ident), "\"%s\"", script->s)) >=
sizeof(string_ident) - 1)
(void)strcpy(string_ident +
sizeof(string_ident) - 6, " ...\"");
fname = string_ident;
s = script->s;
state = ST_STRING;
goto again;
default:
abort();
}
case ST_FILE:
if ((p = fgets(buf, n, f)) != NULL) {
linenum++;
if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
nflag = 1;
if (more != NULL)
*more = !feof(f);
return (p);
}
script = script->next;
(void)fclose(f);
state = ST_EOF;
goto again;
case ST_STRING:
if (linenum == 0 && s[0] == '#' && s[1] == 'n')
nflag = 1;
p = buf;
for (;;) {
if (n-- <= 1) {
*p = '\0';
linenum++;
if (more != NULL)
*more = 1;
return (buf);
}
switch (*s) {
case '\0':
state = ST_EOF;
if (s == script->s) {
script = script->next;
goto again;
} else {
script = script->next;
*p = '\0';
linenum++;
if (more != NULL)
*more = 0;
return (buf);
}
case '\n':
*p++ = '\n';
*p = '\0';
s++;
linenum++;
if (more != NULL)
*more = 0;
return (buf);
default:
*p++ = *s++;
}
}
}
/* NOTREACHED */
return (NULL);
}
/*
* Like fgets, but go through the list of files chaining them together.
* Set len to the length of the line.
*/
int
mf_fgets(SPACE *sp, enum e_spflag spflag)
{
struct stat sb;
size_t len;
static char *p = NULL;
static size_t plen = 0;
int c;
static int firstfile;
if (infile == NULL) {
/* stdin? */
if (files->fname == NULL) {
if (inplace != NULL)
errx(1, "-I or -i may not be used with stdin");
infile = stdin;
fname = "stdin";
outfile = stdout;
outfname = "stdout";
}
firstfile = 1;
}
for (;;) {
if (infile != NULL && (c = getc(infile)) != EOF) {
(void)ungetc(c, infile);
break;
}
/* If we are here then either eof or no files are open yet */
if (infile == stdin) {
sp->len = 0;
return (0);
}
if (infile != NULL) {
fclose(infile);
if (*oldfname != '\0') {
/* if there was a backup file, remove it */
unlink(oldfname);
/*
* Backup the original. Note that hard links
* are not supported on all filesystems.
*/
if ((link(fname, oldfname) != 0) &&
(rename(fname, oldfname) != 0)) {
warn("rename()");
if (*tmpfname)
unlink(tmpfname);
exit(1);
}
*oldfname = '\0';
}
if (*tmpfname != '\0') {
if (outfile != NULL && outfile != stdout)
if (fclose(outfile) != 0) {
warn("fclose()");
unlink(tmpfname);
exit(1);
}
outfile = NULL;
if (rename(tmpfname, fname) != 0) {
/* this should not happen really! */
warn("rename()");
unlink(tmpfname);
exit(1);
}
*tmpfname = '\0';
}
outfname = NULL;
}
if (firstfile == 0)
files = files->next;
else
firstfile = 0;
if (files == NULL) {
sp->len = 0;
return (0);
}
fname = files->fname;
if (inplace != NULL) {
if (lstat(fname, &sb) != 0)
err(1, "%s", fname);
if (!(sb.st_mode & S_IFREG))
errx(1, "%s: %s %s", fname,
"in-place editing only",
"works for regular files");
if (*inplace != '\0') {
strlcpy(oldfname, fname,
sizeof(oldfname));
len = strlcat(oldfname, inplace,
sizeof(oldfname));
if (len > sizeof(oldfname))
errx(1, "%s: name too long", fname);
}
char d_name[PATH_MAX], f_name[PATH_MAX];
(void)strlcpy(d_name, fname, sizeof(d_name));
(void)strlcpy(f_name, fname, sizeof(f_name));
len = (size_t)snprintf(tmpfname, sizeof(tmpfname),
"%s/.!%ld!%s", dirname(d_name), (long)getpid(),
basename(f_name));
if (len >= sizeof(tmpfname))
errx(1, "%s: name too long", fname);
unlink(tmpfname);
if (outfile != NULL && outfile != stdout)
fclose(outfile);
if ((outfile = fopen(tmpfname, "w")) == NULL)
err(1, "%s", fname);
fchown(fileno(outfile), sb.st_uid, sb.st_gid);
fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
outfname = tmpfname;
if (!ispan) {
linenum = 0;
resetstate();
}
} else {
outfile = stdout;
outfname = "stdout";
}
if ((infile = fopen(fname, "r")) == NULL) {
warn("%s", fname);
rval = 1;
continue;
}
}
/*
* We are here only when infile is open and we still have something
* to read from it.
*
* Use getline() so that we can handle essentially infinite input
* data. The p and plen are static so each invocation gives
* getline() the same buffer which is expanded as needed.
*/
ssize_t slen = getline(&p, &plen, infile);
if (slen == -1)
err(1, "%s", fname);
if (slen != 0 && p[slen - 1] == '\n')
slen--;
cspace(sp, p, (size_t)slen, spflag);
linenum++;
return (1);
}
/*
* Add a compilation unit to the linked list
*/
static void
add_compunit(enum e_cut type, char *s)
{
struct s_compunit *cu;
cu = xmalloc(sizeof(struct s_compunit));
cu->type = type;
cu->s = s;
cu->next = NULL;
*cu_nextp = cu;
cu_nextp = &cu->next;
}
/*
* Add a file to the linked list
*/
static void
add_file(char *s)
{
struct s_flist *fp;
fp = xmalloc(sizeof(struct s_flist));
fp->next = NULL;
*fl_nextp = fp;
fp->fname = s;
fl_nextp = &fp->next;
}
int
lastline(void)
{
int ch;
if (files->next != NULL && (inplace == NULL || ispan))
return (0);
if ((ch = getc(infile)) == EOF)
return (1);
ungetc(ch, infile);
return (0);
}
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