cmd/sed/main.c

	main.c revision 84441f85b19f6b8080883f30109e58e43c893709
/*
 * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
 * 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.
 * 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.
 */

#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>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <libintl.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. */
ulong_t linenum;

static void add_compunit(enum e_cut, char *);
static void add_file(char *);
static void usage(void);
static char *getln(FILE *, size_t *);


int
main(int argc, char *argv[])
{
    int c, fflag;
    char *temp_arg;

    (void) setlocale(LC_ALL, "");

#ifndef TEXT_DOMAIN
#define TEXT_DOMAIN "SYS_TEST"
#endif
    (void) textdomain(TEXT_DOMAIN);

    fflag = 0;
    inplace = NULL;

    while ((c = getopt(argc, argv, "EI:ae:f:i:lnr")) != -1)
        switch (c) {
        case 'r':       /* Gnu sed compat */
        case 'E':
            rflags = REG_EXTENDED;
            break;
        case 'I':
            inplace = optarg;
            ispan = 1;  /* span across input files */
            break;
        case 'a':
            aflag = 1;
            break;
        case 'e':
            eflag = 1;
            if (asprintf(&temp_arg, "%s\n", optarg) <= 1)
                err(1, "asprintf");
            add_compunit(CU_STRING, temp_arg);
            break;
        case 'f':
            fflag = 1;
            add_compunit(CU_FILE, optarg);
            break;
        case 'i':
            inplace = optarg;
            ispan = 0;  /* don't span across input files */
            break;
        case 'l':
            /* On SunOS, setlinebuf "returns no useful value */
            (void) setlinebuf(stdout);
            break;
        case 'n':
            nflag = 1;
            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");
    return (rval);
}

static void
usage(void)
{
    (void) fputs(_("usage: sed script [-Ealn] [-i extension] [file ...]\n"
        "       sed [-Ealn] [-i extension] [-e script] ... "
        "[-f script_file] ... [file ...]"),
        stderr);
    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;
        }
        /*NOTREACHED*/

    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;
    char *p;
    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) {
            (void) fclose(infile);
            if (*oldfname != '\0') {
                if (link(fname, oldfname) != 0) {
                    warn("link()");
                    (void) unlink(tmpfname);
                    exit(1);
                }
                *oldfname = '\0';
            }
            if (*tmpfname != '\0') {
                if (outfile != NULL && outfile != stdout)
                    if (fclose(outfile) != 0) {
                        warn("fclose()");
                        (void) unlink(tmpfname);
                        exit(1);
                    }
                outfile = NULL;
                if (rename(tmpfname, fname) != 0) {
                    /* this should not happen really! */
                    warn("rename()");
                    (void) 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) {
            char bn[PATH_MAX];
            char dn[PATH_MAX];
            (void) strlcpy(bn, fname, sizeof (bn));
            (void) strlcpy(dn, fname, sizeof (dn));
            if (lstat(fname, &sb) != 0)
                err(1, "%s", fname);
            if (!(sb.st_mode & S_IFREG))
                fatal(_("in-place editing only "
                    "works for regular files"));
            if (*inplace != '\0') {
                (void) strlcpy(oldfname, fname,
                    sizeof (oldfname));
                len = strlcat(oldfname, inplace,
                    sizeof (oldfname));
                if (len > sizeof (oldfname))
                    fatal(_("name too long"));
            }
            len = snprintf(tmpfname, sizeof (tmpfname),
                "%s/.!%ld!%s", dirname(dn), (long)getpid(),
                basename(bn));
            if (len >= sizeof (tmpfname))
                fatal(_("name too long"));
            (void) unlink(tmpfname);
            if ((outfile = fopen(tmpfname, "w")) == NULL)
                err(1, "%s", fname);
            if (fchown(fileno(outfile), sb.st_uid, sb.st_gid) != 0)
                warn("fchown()");
            if (fchmod(fileno(outfile), sb.st_mode & 07777) != 0)
                warn("fchmod()");
            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 fgetln so that we can handle essentially infinite input data.
     * Can't use the pointer into the stdio buffer as the process space
     * because the ungetc() can cause it to move.
     */
    p = getln(infile, &len);
    if (ferror(infile))
        errx(1, "%s: %s", fname, strerror(errno ? errno : EIO));
    if (len != 0 && p[len - 1] == '\n')
        len--;
    cspace(sp, p, len, 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;

    if ((cu = malloc(sizeof (struct s_compunit))) == NULL)
        err(1, "malloc");
    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;

    if ((fp = malloc(sizeof (struct s_flist))) == NULL)
        err(1, "malloc");
    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);
    (void) ungetc(ch, infile);
    return (0);
}

char *
getln(FILE *in, size_t *lenp)
{
    static char *buffer = NULL;
    static size_t   sz = 0;

    size_t      len = 0;

    for (;;) {
        if (sz <= (len + 1)) {
            char *nb;
            if ((nb = realloc(buffer, sz + LINE_MAX)) == NULL) {
                err(1, "realloc");
            }
            buffer = nb;
            sz += LINE_MAX;
        }

        buffer[len] = 0;

        if (fgets(buffer + len, sz - len, in) == NULL) {
            /* END OF FILE */
            *lenp = len;
            break;
        }

        len += strlen(buffer + len);

        if (buffer[len - 1] == '\n') {
            /* got the new line */
            *lenp = len;
            break;
        }
    }

    return (buffer);
}