/*- * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 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. */ #ifndef lint static const char copyright[] = "@(#) Copyright (c) 1992, 1993\n\ The Regents of the University of California. All rights reserved.\n"; #endif #if 0 #ifndef lint static char sccsid[] = "@(#)compress.c 8.2 (Berkeley) 1/7/94"; #endif #endif #include __FBSDID("$FreeBSD: src/usr.bin/compress/compress.c,v 1.21 2003/06/14 13:41:31 trhodes Exp $"); #include #include #include #include #include #include #include #include #include #include #include "zopen.h" void compress(const char *, const char *, int); void cwarn(const char *, ...) __printflike(1, 2); void cwarnx(const char *, ...) __printflike(1, 2); void decompress(const char *, const char *, int); int permission(const char *); void setfile(const char *, struct stat *); void usage(int); int eval, force, verbose, cat; int main(int argc, char *argv[]) { enum {COMPRESS, DECOMPRESS} style; size_t len; int bits, ch; char *p, newname[MAXPATHLEN]; if (argc < 1) usage(1); cat = 0; if ((p = rindex(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")) { cat = 1; style = DECOMPRESS; } else errx(1, "unknown program name"); bits = 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) { cat = 1; switch(style) { case COMPRESS: (void)compress("/dev/stdin", "/dev/stdout", bits); break; case DECOMPRESS: (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) switch(style) { case COMPRESS: if (strcmp(*argv, "-") == 0) { cat = 1; compress("/dev/stdin", "/dev/stdout", bits); break; } else if (cat) { compress(*argv, "/dev/stdout", bits); break; } if ((p = rindex(*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: if (strcmp(*argv, "-") == 0) { cat = 1; decompress("/dev/stdin", "/dev/stdout", bits); break; } len = strlen(*argv); if ((p = rindex(*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); } 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); } break; } exit (eval); } void compress(const char *in, const char *out, int bits) { size_t nr; struct stat isb, sb; FILE *ifp, *ofp; int exists, isreg, oreg; u_char buf[1024]; exists = !stat(out, &sb); if (!force && exists && S_ISREG(sb.st_mode) && !cat && !permission(out)) { cwarnx("%s already exists", out); return; } isreg = oreg = !exists || S_ISREG(sb.st_mode); ifp = ofp = NULL; if ((ifp = fopen(in, "r")) == NULL) { cwarn("%s", in); return; } if (stat(in, &isb)) { /* DON'T FSTAT! */ cwarn("%s", in); goto err; } if (!S_ISREG(isb.st_mode)) isreg = 0; if ((ofp = zopen(out, "w", bits)) == NULL) { cwarn("%s", out); goto err; } while ((nr = fread(buf, 1, sizeof(buf), ifp)) != 0) if (fwrite(buf, 1, nr, ofp) != nr) { cwarn("%s", out); goto err; } if (ferror(ifp) || fclose(ifp)) { cwarn("%s", in); goto err; } ifp = NULL; if (fclose(ofp)) { cwarn("%s", out); goto err; } ofp = NULL; if (!cat && isreg) { if (stat(out, &sb)) { cwarn("%s", out); goto err; } if (!force && sb.st_size >= isb.st_size) { if (verbose) (void)fprintf(stderr, "%s: file would grow; left unmodified\n", in); eval = 2; if (unlink(out)) cwarn("%s", out); goto err; } setfile(out, &isb); if (unlink(in)) cwarn("%s", in); if (verbose) { (void)fprintf(stderr, "%s: ", out); if (isb.st_size > sb.st_size) (void)fprintf(stderr, "%.0f%% compression\n", ((float)sb.st_size / isb.st_size) * 100.0); else (void)fprintf(stderr, "%.0f%% expansion\n", ((float)isb.st_size / sb.st_size) * 100.0); } } return; err: if (ofp) { if (!cat && oreg) (void)unlink(out); (void)fclose(ofp); } if (ifp) (void)fclose(ifp); } 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[1024]; exists = !stat(out, &sb); if (!force && exists && S_ISREG(sb.st_mode) && !cat && !permission(out)) { cwarnx("%s already exists", out); return; } isreg = oreg = !exists || S_ISREG(sb.st_mode); ifp = ofp = NULL; if ((ifp = zopen(in, "r", bits)) == NULL) { cwarn("%s", in); return; } if (stat(in, &sb)) { cwarn("%s", in); goto err; } if (!S_ISREG(sb.st_mode)) isreg = 0; /* * Try to read the first few uncompressed bytes from the input file * before blindly truncating the output file. */ if ((nr = fread(buf, 1, sizeof(buf), ifp)) == 0) { cwarn("%s", in); (void)fclose(ifp); return; } if ((ofp = fopen(out, "w")) == NULL || (nr != 0 && fwrite(buf, 1, nr, ofp) != nr)) { cwarn("%s", out); (void)fclose(ifp); return; } while ((nr = fread(buf, 1, sizeof(buf), ifp)) != 0) if (fwrite(buf, 1, nr, ofp) != nr) { cwarn("%s", out); goto err; } if (ferror(ifp) || fclose(ifp)) { cwarn("%s", in); goto err; } ifp = NULL; if (fclose(ofp)) { cwarn("%s", out); goto err; } if (!cat && isreg) { setfile(out, &sb); if (unlink(in)) cwarn("%s", in); if (verbose) { struct stat isb = sb; stat(out, &sb); (void)fprintf(stderr, "%s: ", out); if (isb.st_size > sb.st_size) (void)fprintf(stderr, "%.0f%% compression\n", ((float)sb.st_size / isb.st_size) * 100.0); else (void)fprintf(stderr, "%.0f%% expansion\n", ((float)isb.st_size / sb.st_size) * 100.0); } } return; err: if (ofp) { if (!cat && oreg) (void)unlink(out); (void)fclose(ofp); } if (ifp) (void)fclose(ifp); } 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) && errno != ENOTSUP) cwarn("chmod: %s", name); if (chflags(name, fs->st_flags) && errno != ENOTSUP) cwarn("chflags: %s", name); } 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'); } void usage(int iscompress) { if (iscompress) (void)fprintf(stderr, "usage: compress [-cfv] [-b bits] [file ...]\n"); else (void)fprintf(stderr, "usage: uncompress [-cfv] [-b bits] [file ...]\n"); exit(1); } void cwarnx(const char *fmt, ...) { va_list ap; va_start(ap, fmt); vwarnx(fmt, ap); va_end(ap); eval = 1; } void cwarn(const char *fmt, ...) { va_list ap; va_start(ap, fmt); vwarn(fmt, ap); va_end(ap); eval = 1; }