/*- * Copyright (c) 2003-2007 Tim Kientzle * 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 * in this position and unchanged. * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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 AUTHOR(S) 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 "cpio_platform.h" __FBSDID("$FreeBSD$"); #include #include #include #ifdef HAVE_SYS_STAT_H #include #endif #ifdef HAVE_ERRNO_H #include #endif #ifdef HAVE_FCNTL_H #include #endif #ifdef HAVE_STDARG_H #include #endif #include #ifdef HAVE_STDLIB_H #include #endif #ifdef HAVE_STRING_H #include #endif #ifdef HAVE_UNISTD_H #include #endif #include "cpio.h" #include "matching.h" static int copy_data(struct archive *, struct archive *); static const char *cpio_rename(const char *name); static int entry_to_archive(struct cpio *, struct archive_entry *); static int file_to_archive(struct cpio *, const char *); static void long_help(void); static void mode_in(struct cpio *); static void mode_list(struct cpio *); static void mode_out(struct cpio *); static void mode_pass(struct cpio *, const char *); static void restore_time(struct cpio *, struct archive_entry *, const char *, int fd); static void usage(void); static void version(void); int main(int argc, char *argv[]) { static char buff[16384]; struct cpio _cpio; /* Allocated on stack. */ struct cpio *cpio; int uid, gid; int opt; cpio = &_cpio; memset(cpio, 0, sizeof(*cpio)); cpio->buff = buff; cpio->buff_size = sizeof(buff); /* Need cpio_progname before calling cpio_warnc. */ if (*argv == NULL) cpio_progname = "bsdcpio"; else { cpio_progname = strrchr(*argv, '/'); if (cpio_progname != NULL) cpio_progname++; else cpio_progname = *argv; } cpio->uid_override = -1; cpio->gid_override = -1; cpio->argv = argv; cpio->argc = argc; cpio->mode = '\0'; cpio->verbose = 0; cpio->compress = '\0'; /* TODO: Implement old binary format in libarchive, use that here. */ cpio->format = "odc"; /* Default format */ cpio->extract_flags = ARCHIVE_EXTRACT_NO_AUTODIR; cpio->extract_flags |= ARCHIVE_EXTRACT_NO_OVERWRITE_NEWER; cpio->extract_flags |= ARCHIVE_EXTRACT_SECURE_SYMLINKS; cpio->extract_flags |= ARCHIVE_EXTRACT_SECURE_NODOTDOT; /* TODO: If run by root, set owner as well. */ cpio->bytes_per_block = 512; cpio->filename = NULL; while ((opt = cpio_getopt(cpio)) != -1) { switch (opt) { case 'A': /* NetBSD/OpenBSD */ cpio->option_append = 1; break; case 'a': /* POSIX 1997 */ cpio->option_atime_restore = 1; break; case 'B': /* POSIX 1997 */ cpio->bytes_per_block = 5120; break; case 'C': /* NetBSD/OpenBSD */ cpio->bytes_per_block = atoi(optarg); if (cpio->bytes_per_block <= 0) cpio_errc(1, 0, "Invalid blocksize %s", optarg); break; case 'c': /* POSIX 1997 */ cpio->format = "odc"; break; case 'd': /* POSIX 1997 */ cpio->extract_flags &= ~ARCHIVE_EXTRACT_NO_AUTODIR; break; case 'E': /* NetBSD/OpenBSD */ include_from_file(cpio, optarg); break; case 'F': /* NetBSD/OpenBSD/GNU cpio */ cpio->filename = optarg; break; case 'f': /* POSIX 1997 */ exclude(cpio, optarg); break; case 'H': /* GNU cpio (also --format) */ cpio->format = optarg; break; case 'h': long_help(); break; case 'I': /* NetBSD/OpenBSD */ cpio->filename = optarg; break; case 'i': /* POSIX 1997 */ cpio->mode = opt; break; case OPTION_INSECURE: cpio->extract_flags &= ~ARCHIVE_EXTRACT_SECURE_SYMLINKS; cpio->extract_flags &= ~ARCHIVE_EXTRACT_SECURE_NODOTDOT; break; case 'L': /* GNU cpio */ cpio->option_follow_links = 1; break; case 'l': /* POSIX 1997 */ cpio->option_link = 1; break; case 'm': /* POSIX 1997 */ cpio->extract_flags |= ARCHIVE_EXTRACT_TIME; break; case 'O': /* GNU cpio */ cpio->filename = optarg; break; case 'o': /* POSIX 1997 */ cpio->mode = opt; break; case 'p': /* POSIX 1997 */ cpio->mode = opt; break; case OPTION_QUIET: /* GNU cpio */ cpio->quiet = 1; break; case 'R': /* GNU cpio, also --owner */ if (owner_parse(optarg, &uid, &gid)) usage(); if (uid != -1) cpio->uid_override = uid; if (gid != -1) cpio->gid_override = gid; break; case 'r': /* POSIX 1997 */ cpio->option_rename = 1; break; case 't': /* POSIX 1997 */ cpio->option_list = 1; break; case 'u': /* POSIX 1997 */ cpio->extract_flags &= ~ARCHIVE_EXTRACT_NO_OVERWRITE_NEWER; break; case 'v': /* POSIX 1997 */ cpio->verbose++; break; case OPTION_VERSION: /* GNU convention */ version(); break; #if 0 /* * cpio_getopt() handles -W specially, so it's not * available here. */ case 'W': /* Obscure, but useful GNU convention. */ break; #endif case 'y': /* tar convention */ cpio->compress = opt; break; case 'Z': /* tar convention */ cpio->compress = opt; break; case 'z': /* tar convention */ cpio->compress = opt; break; default: usage(); } } /* TODO: Sanity-check args, error out on nonsensical combinations. */ cpio->argc -= optind; cpio->argv += optind; switch (cpio->mode) { case 'o': mode_out(cpio); break; case 'i': while (*cpio->argv != NULL) { include(cpio, *cpio->argv); --cpio->argc; ++cpio->argv; } if (cpio->option_list) mode_list(cpio); else mode_in(cpio); break; case 'p': if (*cpio->argv == NULL || **cpio->argv == '\0') cpio_errc(1, 0, "-p mode requires a target directory"); mode_pass(cpio, *cpio->argv); break; default: cpio_errc(1, 0, "Must specify at least one of -i, -o, or -p"); } return (0); } void usage(void) { const char *p; p = cpio_progname; fprintf(stderr, "Brief Usage:\n"); fprintf(stderr, " List: %s -it < archive\n", p); fprintf(stderr, " Extract: %s -i < archive\n", p); fprintf(stderr, " Create: %s -o < filenames > archive\n", p); #ifdef HAVE_GETOPT_LONG fprintf(stderr, " Help: %s --help\n", p); #else fprintf(stderr, " Help: %s -h\n", p); #endif exit(1); } static const char *long_help_msg = "First option must be a mode specifier:\n" " -i Input -o Output -p Pass\n" "Common Options:\n" " -v Verbose\n" "Create: %p -o [options] < [list of files] > [archive]\n" " -z, -y Compress archive with gzip/bzip2\n" " --format {odc|newc|ustar} Select archive format\n" "List: %p -it < [archive]\n" "Extract: %p -i [options] < [archive]\n"; /* * Note that the word 'bsdcpio' will always appear in the first line * of output. * * In particular, /bin/sh scripts that need to test for the presence * of bsdcpio can use the following template: * * if (cpio --help 2>&1 | grep bsdcpio >/dev/null 2>&1 ) then \ * echo bsdcpio; else echo not bsdcpio; fi */ static void long_help(void) { const char *prog; const char *p; prog = cpio_progname; fflush(stderr); p = (strcmp(prog,"bsdcpio") != 0) ? "(bsdcpio)" : ""; printf("%s%s: manipulate archive files\n", prog, p); for (p = long_help_msg; *p != '\0'; p++) { if (*p == '%') { if (p[1] == 'p') { fputs(prog, stdout); p++; } else putchar('%'); } else putchar(*p); } version(); } static void version(void) { fprintf(stdout,"bsdcpio %s -- %s\n", BSDCPIO_VERSION_STRING, archive_version()); exit(0); } static void mode_out(struct cpio *cpio) { struct archive_entry *entry, *spare; unsigned long blocks; int r; if (cpio->option_append) cpio_errc(1, 0, "Append mode not yet supported."); cpio->archive = archive_write_new(); if (cpio->archive == NULL) cpio_errc(1, 0, "Failed to allocate archive object"); switch (cpio->compress) { case 'j': case 'y': archive_write_set_compression_bzip2(cpio->archive); break; case 'z': archive_write_set_compression_gzip(cpio->archive); break; case 'Z': archive_write_set_compression_compress(cpio->archive); break; default: archive_write_set_compression_none(cpio->archive); break; } r = archive_write_set_format_by_name(cpio->archive, cpio->format); if (r != ARCHIVE_OK) cpio_errc(1, 0, archive_error_string(cpio->archive)); archive_write_set_bytes_per_block(cpio->archive, cpio->bytes_per_block); cpio->linkresolver = archive_entry_linkresolver_new(); archive_entry_linkresolver_set_strategy(cpio->linkresolver, archive_format(cpio->archive)); r = archive_write_open_file(cpio->archive, cpio->filename); if (r != ARCHIVE_OK) cpio_errc(1, 0, archive_error_string(cpio->archive)); process_lines(cpio, "-", file_to_archive); /* * The hardlink detection may have queued up a couple of entries * that can now be flushed. */ entry = NULL; archive_entry_linkify(cpio->linkresolver, &entry, &spare); while (entry != NULL) { entry_to_archive(cpio, entry); archive_entry_free(entry); entry = NULL; archive_entry_linkify(cpio->linkresolver, &entry, &spare); } r = archive_write_close(cpio->archive); if (r != ARCHIVE_OK) cpio_errc(1, 0, archive_error_string(cpio->archive)); if (!cpio->quiet) { blocks = (archive_position_uncompressed(cpio->archive) + 511) / 512; fprintf(stderr, "%lu %s\n", blocks, blocks == 1 ? "block" : "blocks"); } archive_write_finish(cpio->archive); } /* * This is used by both out mode (to copy objects from disk into * an archive) and pass mode (to copy objects from disk to * an archive_write_disk "archive"). */ static int file_to_archive(struct cpio *cpio, const char *srcpath) { struct stat st; const char *destpath; struct archive_entry *entry, *spare; size_t len; const char *p; int lnklen; int r; /* * Create an archive_entry describing the source file. */ entry = archive_entry_new(); if (entry == NULL) cpio_errc(1, 0, "Couldn't allocate entry"); archive_entry_copy_sourcepath(entry, srcpath); /* Get stat information. */ if (cpio->option_follow_links) r = stat(srcpath, &st); else r = lstat(srcpath, &st); if (r != 0) { cpio_warnc(errno, "Couldn't stat \"%s\"", srcpath); archive_entry_free(entry); return (0); } if (cpio->uid_override >= 0) st.st_uid = cpio->uid_override; if (cpio->gid_override >= 0) st.st_gid = cpio->uid_override; archive_entry_copy_stat(entry, &st); /* If its a symlink, pull the target. */ if (S_ISLNK(st.st_mode)) { lnklen = readlink(srcpath, cpio->buff, cpio->buff_size); if (lnklen < 0) { cpio_warnc(errno, "%s: Couldn't read symbolic link", srcpath); archive_entry_free(entry); return (0); } cpio->buff[lnklen] = 0; archive_entry_set_symlink(entry, cpio->buff); } /* * Generate a destination path for this entry. * "destination path" is the name to which it will be copied in * pass mode or the name that will go into the archive in * output mode. */ destpath = srcpath; if (cpio->destdir) { len = strlen(cpio->destdir) + strlen(srcpath) + 8; if (len >= cpio->pass_destpath_alloc) { while (len >= cpio->pass_destpath_alloc) { cpio->pass_destpath_alloc += 512; cpio->pass_destpath_alloc *= 2; } free(cpio->pass_destpath); cpio->pass_destpath = malloc(cpio->pass_destpath_alloc); if (cpio->pass_destpath == NULL) cpio_errc(1, ENOMEM, "Can't allocate path buffer"); } strcpy(cpio->pass_destpath, cpio->destdir); p = srcpath; while (p[0] == '/') ++p; strcat(cpio->pass_destpath, p); destpath = cpio->pass_destpath; } if (cpio->option_rename) destpath = cpio_rename(destpath); if (destpath == NULL) return (0); archive_entry_copy_pathname(entry, destpath); /* * If we're trying to preserve hardlinks, match them here. */ spare = NULL; if (cpio->linkresolver != NULL && !S_ISDIR(st.st_mode)) { archive_entry_linkify(cpio->linkresolver, &entry, &spare); } if (entry != NULL) { r = entry_to_archive(cpio, entry); archive_entry_free(entry); } if (spare != NULL) { if (r == 0) r = entry_to_archive(cpio, spare); archive_entry_free(spare); } return (r); } static int entry_to_archive(struct cpio *cpio, struct archive_entry *entry) { const char *destpath = archive_entry_pathname(entry); const char *srcpath = archive_entry_sourcepath(entry); int fd = -1; ssize_t bytes_read; int r; /* Print out the destination name to the user. */ if (cpio->verbose) fprintf(stderr,"%s", destpath); /* * Obviously, this only gets invoked in pass mode. */ if (cpio->option_link) { /* Note: link(2) doesn't create parent directories. */ archive_entry_set_hardlink(entry, srcpath); r = archive_write_header(cpio->archive, entry); if (r != ARCHIVE_OK) cpio_warnc(archive_errno(cpio->archive), archive_error_string(cpio->archive)); if (r == ARCHIVE_FATAL) exit(1); return (0); } /* * Make sure we can open the file (if necessary) before * trying to write the header. */ if (archive_entry_filetype(entry) == AE_IFREG) { if (archive_entry_size(entry) > 0) { fd = open(srcpath, O_RDONLY); if (fd < 0) { cpio_warnc(errno, "%s: could not open file", srcpath); goto cleanup; } } } else { archive_entry_set_size(entry, 0); } r = archive_write_header(cpio->archive, entry); if (r != ARCHIVE_OK) cpio_warnc(archive_errno(cpio->archive), "%s: %s", destpath, archive_error_string(cpio->archive)); if (r == ARCHIVE_FATAL) exit(1); if (r >= ARCHIVE_WARN && fd >= 0) { bytes_read = read(fd, cpio->buff, cpio->buff_size); while (bytes_read > 0) { r = archive_write_data(cpio->archive, cpio->buff, bytes_read); if (r < 0) cpio_errc(1, archive_errno(cpio->archive), archive_error_string(cpio->archive)); if (r < bytes_read) { cpio_warnc(0, "Truncated write; file may have grown while being archived."); } bytes_read = read(fd, cpio->buff, cpio->buff_size); } } restore_time(cpio, entry, srcpath, fd); cleanup: if (cpio->verbose) fprintf(stderr,"\n"); if (fd >= 0) close(fd); return (0); } static void restore_time(struct cpio *cpio, struct archive_entry *entry, const char *name, int fd) { #ifndef HAVE_UTIMES static int warned = 0; (void)cpio; /* UNUSED */ (void)entry; /* UNUSED */ (void)name; /* UNUSED */ (void)fd; /* UNUSED */ if (!warned) cpio_warnc(0, "Can't restore access times on this platform"); warned = 1; return; #else struct timeval times[2]; if (!cpio->option_atime_restore) return; times[1].tv_sec = archive_entry_mtime(entry); times[1].tv_usec = archive_entry_mtime_nsec(entry) / 1000; times[0].tv_sec = archive_entry_atime(entry); times[0].tv_usec = archive_entry_atime_nsec(entry) / 1000; #ifdef HAVE_FUTIMES if (fd >= 0 && futimes(fd, times) == 0) return; #endif #ifdef HAVE_LUTIMES if (lutimes(name, times) != 0) #else if (!S_ISLNK(archive_entry_mode(entry)) && utimes(name, times) != 0) #endif cpio_warnc(errno, "Can't update time for %s", name); #endif } static void mode_in(struct cpio *cpio) { struct archive *a; struct archive_entry *entry; struct archive *ext; const char *destpath; unsigned long blocks; int r; ext = archive_write_disk_new(); if (ext == NULL) cpio_errc(1, 0, "Couldn't allocate restore object"); r = archive_write_disk_set_options(ext, cpio->extract_flags); if (r != ARCHIVE_OK) cpio_errc(1, 0, archive_error_string(ext)); a = archive_read_new(); if (a == NULL) cpio_errc(1, 0, "Couldn't allocate archive object"); archive_read_support_compression_all(a); archive_read_support_format_all(a); if (archive_read_open_file(a, cpio->filename, cpio->bytes_per_block)) cpio_errc(1, archive_errno(a), archive_error_string(a)); for (;;) { r = archive_read_next_header(a, &entry); if (r == ARCHIVE_EOF) break; if (r != ARCHIVE_OK) { cpio_errc(1, archive_errno(a), archive_error_string(a)); } if (excluded(cpio, archive_entry_pathname(entry))) continue; if (cpio->option_rename) { destpath = cpio_rename(archive_entry_pathname(entry)); archive_entry_set_pathname(entry, destpath); } else destpath = archive_entry_pathname(entry); if (destpath == NULL) continue; if (cpio->verbose) fprintf(stdout, "%s\n", destpath); if (cpio->uid_override >= 0) archive_entry_set_uid(entry, cpio->uid_override); if (cpio->gid_override >= 0) archive_entry_set_gid(entry, cpio->gid_override); r = archive_write_header(ext, entry); if (r != ARCHIVE_OK) { fprintf(stderr, "%s: %s\n", archive_entry_pathname(entry), archive_error_string(ext)); } else if (archive_entry_size(entry) > 0) { r = copy_data(a, ext); } } r = archive_read_close(a); if (r != ARCHIVE_OK) cpio_errc(1, 0, archive_error_string(a)); r = archive_write_close(ext); if (r != ARCHIVE_OK) cpio_errc(1, 0, archive_error_string(ext)); if (!cpio->quiet) { blocks = (archive_position_uncompressed(a) + 511) / 512; fprintf(stderr, "%lu %s\n", blocks, blocks == 1 ? "block" : "blocks"); } archive_read_finish(a); archive_write_finish(ext); exit(0); } static int copy_data(struct archive *ar, struct archive *aw) { int r; size_t size; const void *block; off_t offset; for (;;) { r = archive_read_data_block(ar, &block, &size, &offset); if (r == ARCHIVE_EOF) return (ARCHIVE_OK); if (r != ARCHIVE_OK) { cpio_warnc(archive_errno(ar), "%s", archive_error_string(ar)); return (r); } r = archive_write_data_block(aw, block, size, offset); if (r != ARCHIVE_OK) { cpio_warnc(archive_errno(aw), archive_error_string(aw)); return (r); } } } static void mode_list(struct cpio *cpio) { struct archive *a; struct archive_entry *entry; unsigned long blocks; int r; a = archive_read_new(); if (a == NULL) cpio_errc(1, 0, "Couldn't allocate archive object"); archive_read_support_compression_all(a); archive_read_support_format_all(a); if (archive_read_open_file(a, cpio->filename, cpio->bytes_per_block)) cpio_errc(1, archive_errno(a), archive_error_string(a)); for (;;) { r = archive_read_next_header(a, &entry); if (r == ARCHIVE_EOF) break; if (r != ARCHIVE_OK) { cpio_errc(1, archive_errno(a), archive_error_string(a)); } if (excluded(cpio, archive_entry_pathname(entry))) continue; if (cpio->verbose) { /* TODO: uname/gname lookups */ /* TODO: Clean this up. */ fprintf(stdout, "%s%3d %8s%8s " CPIO_FILESIZE_PRINTF " %s\n", archive_entry_strmode(entry), archive_entry_nlink(entry), archive_entry_uname(entry), archive_entry_gname(entry), (CPIO_FILESIZE_TYPE)archive_entry_size(entry), archive_entry_pathname(entry)); } else fprintf(stdout, "%s\n", archive_entry_pathname(entry)); } r = archive_read_close(a); if (r != ARCHIVE_OK) cpio_errc(1, 0, archive_error_string(a)); if (!cpio->quiet) { blocks = (archive_position_uncompressed(a) + 511) / 512; fprintf(stderr, "%lu %s\n", blocks, blocks == 1 ? "block" : "blocks"); } archive_read_finish(a); exit(0); } static void mode_pass(struct cpio *cpio, const char *destdir) { int r; /* Ensure target dir has a trailing '/' to simplify path surgery. */ cpio->destdir = malloc(strlen(destdir) + 8); strcpy(cpio->destdir, destdir); if (destdir[strlen(destdir) - 1] != '/') strcat(cpio->destdir, "/"); cpio->archive = archive_write_disk_new(); if (cpio->archive == NULL) cpio_errc(1, 0, "Failed to allocate archive object"); r = archive_write_disk_set_options(cpio->archive, cpio->extract_flags); if (r != ARCHIVE_OK) cpio_errc(1, 0, archive_error_string(cpio->archive)); cpio->linkresolver = archive_entry_linkresolver_new(); archive_write_disk_set_standard_lookup(cpio->archive); process_lines(cpio, "-", file_to_archive); archive_entry_linkresolver_free(cpio->linkresolver); r = archive_write_close(cpio->archive); if (r != ARCHIVE_OK) cpio_errc(1, 0, archive_error_string(cpio->archive)); archive_write_finish(cpio->archive); } /* * Prompt for a new name for this entry. Returns a pointer to the * new name or NULL if the entry should not be copied. This * implements the semantics defined in POSIX.1-1996, which specifies * that an input of '.' means the name should be unchanged. GNU cpio * treats '.' as a literal new name. */ static const char * cpio_rename(const char *name) { static char buff[1024]; FILE *t; char *p, *ret; t = fopen("/dev/tty", "r+"); if (t == NULL) return (name); fprintf(t, "%s (Enter/./(new name))? ", name); fflush(t); p = fgets(buff, sizeof(buff), t); fclose(t); if (p == NULL) /* End-of-file is a blank line. */ return (NULL); while (*p == ' ' || *p == '\t') ++p; if (*p == '\n' || *p == '\0') /* Empty line. */ return (NULL); if (*p == '.' && p[1] == '\n') /* Single period preserves original name. */ return (name); ret = p; /* Trim the final newline. */ while (*p != '\0' && *p != '\n') ++p; /* Overwrite the final \n with a null character. */ *p = '\0'; return (ret); } /* * Read lines from file and do something with each one. If option_null * is set, lines are terminated with zero bytes; otherwise, they're * terminated with newlines. * * This uses a self-sizing buffer to handle arbitrarily-long lines. * If the "process" function returns non-zero for any line, this * function will return non-zero after attempting to process all * remaining lines. */ int process_lines(struct cpio *cpio, const char *pathname, int (*process)(struct cpio *, const char *)) { FILE *f; char *buff, *buff_end, *line_start, *line_end, *p; size_t buff_length, bytes_read, bytes_wanted; int separator; int ret; separator = cpio->option_null ? '\0' : '\n'; ret = 0; if (strcmp(pathname, "-") == 0) f = stdin; else f = fopen(pathname, "r"); if (f == NULL) cpio_errc(1, errno, "Couldn't open %s", pathname); buff_length = 8192; buff = malloc(buff_length); if (buff == NULL) cpio_errc(1, ENOMEM, "Can't read %s", pathname); line_start = line_end = buff_end = buff; for (;;) { /* Get some more data into the buffer. */ bytes_wanted = buff + buff_length - buff_end; bytes_read = fread(buff_end, 1, bytes_wanted, f); buff_end += bytes_read; /* Process all complete lines in the buffer. */ while (line_end < buff_end) { if (*line_end == separator) { *line_end = '\0'; if ((*process)(cpio, line_start) != 0) ret = -1; line_start = line_end + 1; line_end = line_start; } else line_end++; } if (feof(f)) break; if (ferror(f)) cpio_errc(1, errno, "Can't read %s", pathname); if (line_start > buff) { /* Move a leftover fractional line to the beginning. */ memmove(buff, line_start, buff_end - line_start); buff_end -= line_start - buff; line_end -= line_start - buff; line_start = buff; } else { /* Line is too big; enlarge the buffer. */ p = realloc(buff, buff_length *= 2); if (p == NULL) cpio_errc(1, ENOMEM, "Line too long in %s", pathname); buff_end = p + (buff_end - buff); line_end = p + (line_end - buff); line_start = buff = p; } } /* At end-of-file, handle the final line. */ if (line_end > line_start) { *line_end = '\0'; if ((*process)(cpio, line_start) != 0) ret = -1; } free(buff); if (f != stdin) fclose(f); return (ret); }