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author | Kiyoshi Aman <kiyoshi.aman+adelie@gmail.com> | 2019-02-01 22:55:37 +0000 |
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committer | Kiyoshi Aman <kiyoshi.aman+adelie@gmail.com> | 2019-02-03 18:22:05 -0600 |
commit | 5b57d28ffb6e1ef86b50f7d05d977826eae89bfe (patch) | |
tree | 154a22fe556b49e6927197336f8bf91b12eacd5e /usr.bin/compress/compress.c | |
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initial population
Diffstat (limited to 'usr.bin/compress/compress.c')
-rw-r--r-- | usr.bin/compress/compress.c | 459 |
1 files changed, 459 insertions, 0 deletions
diff --git a/usr.bin/compress/compress.c b/usr.bin/compress/compress.c new file mode 100644 index 0000000..93fdc76 --- /dev/null +++ b/usr.bin/compress/compress.c @@ -0,0 +1,459 @@ +/* $NetBSD: compress.c,v 1.26 2011/08/30 23:08:05 joerg Exp $ */ + +/*- + * Copyright (c) 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * 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> +#ifndef lint +__COPYRIGHT("@(#) Copyright (c) 1992, 1993\ + The Regents of the University of California. All rights reserved."); +#endif /* not lint */ + +#ifndef lint +#if 0 +static char sccsid[] = "@(#)compress.c 8.2 (Berkeley) 1/7/94"; +#else +__RCSID("$NetBSD: compress.c,v 1.26 2011/08/30 23:08:05 joerg Exp $"); +#endif +#endif /* not lint */ + +#include <sys/param.h> +#include <sys/time.h> +#include <sys/stat.h> + +#include <err.h> +#include <errno.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +static void compress(const char *, const char *, int); +static void cwarn(const char *, ...) __printflike(1, 2); +static void cwarnx(const char *, ...) __printflike(1, 2); +static void decompress(const char *, const char *, int); +static int permission(const char *); +static void setfile(const char *, struct stat *); +__dead static void usage(int); + +extern FILE *zopen(const char *fname, const char *mode, int bits); + +static int eval, force, verbose; +static int isstdout, isstdin; + +int +main(int argc, char **argv) +{ + enum {COMPRESS, DECOMPRESS} style = COMPRESS; + size_t len; + int bits, cat, ch; + char *p, newname[MAXPATHLEN]; + + if ((p = strrchr(argv[0], '/')) == NULL) + p = argv[0]; + else + ++p; + if (!strcmp(p, "uncompress")) + style = DECOMPRESS; + else if (!strcmp(p, "compress")) + style = COMPRESS; + else if (!strcmp(p, "zcat")) { + style = DECOMPRESS; + cat = 1; + } + else + errx(1, "unknown program name"); + + bits = cat = 0; + while ((ch = getopt(argc, argv, "b:cdfv")) != -1) + switch(ch) { + case 'b': + bits = strtol(optarg, &p, 10); + if (*p) + errx(1, "illegal bit count -- %s", optarg); + break; + case 'c': + cat = 1; + break; + case 'd': /* Backward compatible. */ + style = DECOMPRESS; + break; + case 'f': + force = 1; + break; + case 'v': + verbose = 1; + break; + case '?': + default: + usage(style == COMPRESS); + } + argc -= optind; + argv += optind; + + if (argc == 0) { + switch(style) { + case COMPRESS: + isstdout = 1; + isstdin = 1; + (void)compress("/dev/stdin", "/dev/stdout", bits); + break; + case DECOMPRESS: + isstdout = 1; + isstdin = 1; + (void)decompress("/dev/stdin", "/dev/stdout", bits); + break; + } + exit (eval); + } + + if (cat == 1 && argc > 1) + errx(1, "the -c option permits only a single file argument"); + + for (; *argv; ++argv) { + isstdout = 0; + switch(style) { + case COMPRESS: + if (cat) { + isstdout = 1; + compress(*argv, "/dev/stdout", bits); + break; + } + if ((p = strrchr(*argv, '.')) != NULL && + !strcmp(p, ".Z")) { + cwarnx("%s: name already has trailing .Z", + *argv); + break; + } + len = strlen(*argv); + if (len > sizeof(newname) - 3) { + cwarnx("%s: name too long", *argv); + break; + } + memmove(newname, *argv, len); + newname[len] = '.'; + newname[len + 1] = 'Z'; + newname[len + 2] = '\0'; + compress(*argv, newname, bits); + break; + case DECOMPRESS: + len = strlen(*argv); + if ((p = strrchr(*argv, '.')) == NULL || + strcmp(p, ".Z")) { + if (len > sizeof(newname) - 3) { + cwarnx("%s: name too long", *argv); + break; + } + memmove(newname, *argv, len); + newname[len] = '.'; + newname[len + 1] = 'Z'; + newname[len + 2] = '\0'; + decompress(newname, + cat ? "/dev/stdout" : *argv, bits); + if (cat) + isstdout = 1; + } else { + if (len - 2 > sizeof(newname) - 1) { + cwarnx("%s: name too long", *argv); + break; + } + memmove(newname, *argv, len - 2); + newname[len - 2] = '\0'; + decompress(*argv, + cat ? "/dev/stdout" : newname, bits); + if (cat) + isstdout = 1; + } + break; + } + } + exit (eval); +} + +static void +compress(const char *in, const char *out, int bits) +{ + size_t nr; + struct stat isb, sb; + const char *error = NULL; + FILE *ifp, *ofp; + int exists, isreg, oreg; + u_char buf[BUFSIZ]; + + if (!isstdout) { + exists = !stat(out, &sb); + if (!force && exists && S_ISREG(sb.st_mode) && !permission(out)) + return; + oreg = !exists || S_ISREG(sb.st_mode); + } else + oreg = 0; + + ifp = ofp = NULL; + if ((ifp = fopen(in, "r")) == NULL) { + cwarn("%s", in); + return; + } + + if (!isstdin) { + if (stat(in, &isb)) { /* DON'T FSTAT! */ + cwarn("%s", in); + goto err; + } + if (!S_ISREG(isb.st_mode)) + isreg = 0; + else + isreg = 1; + } else + isreg = 0; + + if ((ofp = zopen(out, "w", bits)) == NULL) { + cwarn("%s", out); + goto err; + } + oreg <<= 1; + while ((nr = fread(buf, 1, sizeof(buf), ifp)) != 0) + if (fwrite(buf, 1, nr, ofp) != nr) { + cwarn("%s", out); + goto err; + } + + if (ferror(ifp)) + error = in; + if (fclose(ifp)) + if (error == NULL) + error = in; + if (fclose(ofp)) + if (error == NULL) + error = out; + ifp = NULL; + ofp = NULL; + if (error) { + cwarn("%s", error); + goto err; + } + + if (isreg && oreg) { + if (stat(out, &sb)) { + cwarn("%s", out); + goto err; + } + + if (!force && sb.st_size >= isb.st_size) { + if (verbose) + (void)printf("%s: file would grow; left unmodified\n", in); + goto err; + } + + setfile(out, &isb); + + if (unlink(in)) + cwarn("%s", in); + + if (verbose) { + (void)printf("%s: ", out); + if (isb.st_size > sb.st_size) + (void)printf("%.0f%% compression\n", + ((double)sb.st_size / isb.st_size) * 100.0); + else + (void)printf("%.0f%% expansion\n", + ((double)isb.st_size / sb.st_size) * 100.0); + } + } + return; + +err: if (ofp) + (void)fclose(ofp); + if (oreg == 2) + (void)unlink(out); + if (ifp) + (void)fclose(ifp); +} + +static void +decompress(const char *in, const char *out, int bits) +{ + size_t nr; + struct stat sb; + FILE *ifp, *ofp; + int exists, isreg, oreg; + u_char buf[BUFSIZ]; + + if (!isstdout) { + exists = !stat(out, &sb); + if (!force && exists && S_ISREG(sb.st_mode) && !permission(out)) + return; + oreg = !exists || S_ISREG(sb.st_mode); + } else + oreg = 0; + + ifp = ofp = NULL; + if ((ofp = fopen(out, "w")) == NULL) { + cwarn("%s", out); + return; + } + + if ((ifp = zopen(in, "r", bits)) == NULL) { + cwarn("%s", in); + goto err; + } + if (!isstdin) { + if (stat(in, &sb)) { + cwarn("%s", in); + goto err; + } + if (!S_ISREG(sb.st_mode)) + isreg = 0; + else + isreg = 1; + } else + isreg = 0; + + oreg <<= 1; + while ((nr = fread(buf, 1, sizeof(buf), ifp)) != 0) + if (fwrite(buf, 1, nr, ofp) != nr) { + cwarn("%s", out); + goto err; + } + + if (ferror(ifp)) { + cwarn("%s", in); + goto err; + } + if (fclose(ifp)) { + ifp = NULL; + cwarn("%s", in); + goto err; + } + ifp = NULL; + + if (fclose(ofp)) { + ofp = NULL; + cwarn("%s", out); + goto err; + } + + if (isreg && oreg) { + setfile(out, &sb); + + if (unlink(in)) + cwarn("%s", in); + } + return; + +err: if (ofp) + (void)fclose(ofp); + if (oreg == 2) + (void)unlink(out); + if (ifp) + (void)fclose(ifp); +} + +static void +setfile(const char *name, struct stat *fs) +{ + static struct timeval tv[2]; + + fs->st_mode &= S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO; + + TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); + TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); + if (utimes(name, tv)) + cwarn("utimes: %s", name); + + /* + * Changing the ownership probably won't succeed, unless we're root + * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting + * the mode; current BSD behavior is to remove all setuid bits on + * chown. If chown fails, lose setuid/setgid bits. + */ + if (chown(name, fs->st_uid, fs->st_gid)) { + if (errno != EPERM) + cwarn("chown: %s", name); + fs->st_mode &= ~(S_ISUID|S_ISGID); + } + if (chmod(name, fs->st_mode)) + cwarn("chown: %s", name); + + /* + * Restore the file's flags. However, do this only if the original + * file had any flags set; this avoids a warning on file-systems that + * do not support flags. + */ + if (fs->st_flags != 0 && chflags(name, fs->st_flags)) + cwarn("chflags: %s", name); +} + +static int +permission(const char *fname) +{ + int ch, first; + + if (!isatty(fileno(stderr))) + return (0); + (void)fprintf(stderr, "overwrite %s? ", fname); + first = ch = getchar(); + while (ch != '\n' && ch != EOF) + ch = getchar(); + return (first == 'y'); +} + +static void +usage(int iscompress) +{ + if (iscompress) + (void)fprintf(stderr, + "usage: compress [-cdfv] [-b bits] [file ...]\n"); + else + (void)fprintf(stderr, + "usage: uncompress [-cdfv] [-b bits] [file ...]\n"); + exit(1); +} + +static void +cwarnx(const char *fmt, ...) +{ + va_list ap; + + va_start(ap, fmt); + vwarnx(fmt, ap); + va_end(ap); + eval = 1; +} + +static void +cwarn(const char *fmt, ...) +{ + va_list ap; + + va_start(ap, fmt); + vwarn(fmt, ap); + va_end(ap); + eval = 1; +} |