/usr.bin/sed/main.c
C | 557 lines | 425 code | 41 blank | 91 comment | 143 complexity | 1bb2855e6b566528ef122110528a33c0 MD5 | raw file
- /*-
- * SPDX-License-Identifier: BSD-3-Clause
- *
- * 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.
- */
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- #ifndef lint
- static const char copyright[] =
- "@(#) Copyright (c) 1992, 1993\n\
- The Regents of the University of California. All rights reserved.\n";
- #endif
- #ifndef lint
- 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>
- #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;
- int quit = 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) */
- 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);
- int
- main(int argc, char *argv[])
- {
- int c, fflag, fflagstdin;
- char *temp_arg;
- (void) setlocale(LC_ALL, "");
- fflag = 0;
- fflagstdin = 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;
- ispan = 1; /* span across input files */
- break;
- case 'a':
- aflag = 1;
- break;
- case 'e':
- eflag = 1;
- if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL)
- err(1, "malloc");
- strcpy(temp_arg, optarg);
- strcat(temp_arg, "\n");
- add_compunit(CU_STRING, temp_arg);
- break;
- case 'f':
- fflag = 1;
- if (strcmp(optarg, "-") == 0)
- fflagstdin = 1;
- add_compunit(CU_FILE, optarg);
- break;
- case 'i':
- inplace = optarg;
- ispan = 0; /* don't span across input files */
- break;
- case 'l':
- if(setvbuf(stdout, NULL, _IOLBF, 0) != 0)
- warnx("setting line buffered output failed");
- break;
- case 'n':
- nflag = 1;
- break;
- case 'u':
- if(setvbuf(stdout, NULL, _IONBF, 0) != 0)
- warnx("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 if (fflagstdin)
- exit(rval);
- 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 script [-Ealnru] [-i extension] [file ...]\n"
- "\t%s [-Ealnu] [-i extension] [-e script] ... [-f script_file]"
- " ... [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 (strcmp(script->s, "-") == 0) {
- f = stdin;
- fname = "stdin";
- } else {
- 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:
- __unreachable();
- }
- 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;
- ssize_t len;
- char *dirbuf, *basebuf;
- 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 && !quit) {
- (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 (!S_ISREG(sb.st_mode))
- 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 > (ssize_t)sizeof(oldfname))
- errx(1, "%s: name too long", fname);
- }
- if ((dirbuf = strdup(fname)) == NULL ||
- (basebuf = strdup(fname)) == NULL)
- err(1, "strdup");
- len = snprintf(tmpfname, sizeof(tmpfname),
- "%s/.!%ld!%s", dirname(dirbuf), (long)getpid(),
- basename(basebuf));
- free(dirbuf);
- free(basebuf);
- if (len >= (ssize_t)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.
- */
- len = getline(&p, &plen, infile);
- if (len == -1)
- err(1, "%s", fname);
- if (len != 0 && p[len - 1] == '\n') {
- sp->append_newline = 1;
- len--;
- } else if (!lastline()) {
- sp->append_newline = 1;
- } else {
- sp->append_newline = 0;
- }
- 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;
- }
- static int
- next_files_have_lines(void)
- {
- struct s_flist *file;
- FILE *file_fd;
- int ch;
- file = files;
- while ((file = file->next) != NULL) {
- if ((file_fd = fopen(file->fname, "r")) == NULL)
- continue;
- if ((ch = getc(file_fd)) != EOF) {
- /*
- * This next file has content, therefore current
- * file doesn't contains the last line.
- */
- ungetc(ch, file_fd);
- fclose(file_fd);
- return (1);
- }
- fclose(file_fd);
- }
- return (0);
- }
- int
- lastline(void)
- {
- int ch;
- if (feof(infile)) {
- return !(
- (inplace == NULL || ispan) &&
- next_files_have_lines());
- }
- if ((ch = getc(infile)) == EOF) {
- return !(
- (inplace == NULL || ispan) &&
- next_files_have_lines());
- }
- ungetc(ch, infile);
- return (0);
- }