diff options
Diffstat (limited to 'text_cmds/cat/cat.c')
| -rw-r--r-- | text_cmds/cat/cat.c | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/text_cmds/cat/cat.c b/text_cmds/cat/cat.c new file mode 100644 index 0000000..e933951 --- /dev/null +++ b/text_cmds/cat/cat.c @@ -0,0 +1,314 @@ +/*- + * Copyright (c) 1989, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Kevin Fall. + * + * 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. + */ + +#if 0 +#ifndef lint +static char const copyright[] = +"@(#) Copyright (c) 1989, 1993\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ +#endif + +#ifndef lint +#if 0 +static char sccsid[] = "@(#)cat.c 8.2 (Berkeley) 4/27/95"; +#endif +#endif /* not lint */ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD: src/bin/cat/cat.c,v 1.32 2005/01/10 08:39:20 imp Exp $"); + +#include <sys/param.h> +#include <sys/stat.h> +#ifndef NO_UDOM_SUPPORT +#include <sys/socket.h> +#include <sys/un.h> +#include <errno.h> +#endif + +#include <ctype.h> +#include <err.h> +#include <fcntl.h> +#include <locale.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <stddef.h> + +int bflag, eflag, nflag, sflag, tflag, vflag; +int rval; +const char *filename; + +static void usage(void); +static void scanfiles(char *argv[], int cooked); +static void cook_cat(FILE *); +static void raw_cat(int); + +#ifndef NO_UDOM_SUPPORT +static int udom_open(const char *path, int flags); +#endif + +int +main(int argc, char *argv[]) +{ + int ch; + + setlocale(LC_CTYPE, ""); + + while ((ch = getopt(argc, argv, "benstuv")) != -1) + switch (ch) { + case 'b': + bflag = nflag = 1; /* -b implies -n */ + break; + case 'e': + eflag = vflag = 1; /* -e implies -v */ + break; + case 'n': + nflag = 1; + break; + case 's': + sflag = 1; + break; + case 't': + tflag = vflag = 1; /* -t implies -v */ + break; + case 'u': + setbuf(stdout, NULL); + break; + case 'v': + vflag = 1; + break; + default: + usage(); + } + argv += optind; + + if (bflag || eflag || nflag || sflag || tflag || vflag) + scanfiles(argv, 1); + else + scanfiles(argv, 0); + if (fclose(stdout)) + err(1, "stdout"); + exit(rval); + /* NOTREACHED */ +} + +static void +usage(void) +{ + fprintf(stderr, "usage: cat [-benstuv] [file ...]\n"); + exit(1); + /* NOTREACHED */ +} + +static void +scanfiles(char *argv[], int cooked) +{ + int i = 0; + char *path; + FILE *fp; + + while ((path = argv[i]) != NULL || i == 0) { + int fd; + + if (path == NULL || strcmp(path, "-") == 0) { + filename = "stdin"; + fd = STDIN_FILENO; + } else { + filename = path; + fd = open(path, O_RDONLY); +#ifndef NO_UDOM_SUPPORT + if (fd < 0 && errno == EOPNOTSUPP) + fd = udom_open(path, O_RDONLY); +#endif + } + if (fd < 0) { + warn("%s", path); + rval = 1; + } else if (cooked) { + if (fd == STDIN_FILENO) + cook_cat(stdin); + else { + fp = fdopen(fd, "r"); + cook_cat(fp); + fclose(fp); + } + } else { + raw_cat(fd); + if (fd != STDIN_FILENO) + close(fd); + } + if (path == NULL) + break; + ++i; + } +} + +static void +cook_cat(FILE *fp) +{ + int ch, gobble, line, prev; + + /* Reset EOF condition on stdin. */ + if (fp == stdin && feof(stdin)) + clearerr(stdin); + + line = gobble = 0; + for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) { + if (prev == '\n') { + if (sflag) { + if (ch == '\n') { + if (gobble) + continue; + gobble = 1; + } else + gobble = 0; + } + if (nflag && (!bflag || ch != '\n')) { + (void)fprintf(stdout, "%6d\t", ++line); + if (ferror(stdout)) + break; + } + } + if (ch == '\n') { + if (eflag && putchar('$') == EOF) + break; + } else if (ch == '\t') { + if (tflag) { + if (putchar('^') == EOF || putchar('I') == EOF) + break; + continue; + } + } else if (vflag) { + if (!isascii(ch) && !isprint(ch)) { + if (putchar('M') == EOF || putchar('-') == EOF) + break; + ch = toascii(ch); + } + if (iscntrl(ch)) { + if (putchar('^') == EOF || + putchar(ch == '\177' ? '?' : + ch | 0100) == EOF) + break; + continue; + } + } + if (putchar(ch) == EOF) + break; + } + if (ferror(fp)) { + warn("%s", filename); + rval = 1; + clearerr(fp); + } + if (ferror(stdout)) + err(1, "stdout"); +} + +static void +raw_cat(int rfd) +{ + int off, wfd; + ssize_t nr, nw; + static size_t bsize; + static char *buf = NULL; + struct stat sbuf; + + wfd = fileno(stdout); + if (buf == NULL) { + if (fstat(wfd, &sbuf)) + err(1, "%s", filename); + bsize = MAX(sbuf.st_blksize, 1024); + if ((buf = malloc(bsize)) == NULL) + err(1, "buffer"); + } + while ((nr = read(rfd, buf, bsize)) > 0) + for (off = 0; nr; nr -= nw, off += nw) + if ((nw = write(wfd, buf + off, (size_t)nr)) < 0) + err(1, "stdout"); + if (nr < 0) { + warn("%s", filename); + rval = 1; + } +} + +#ifndef NO_UDOM_SUPPORT + +static int +udom_open(const char *path, int flags) +{ + struct sockaddr_un sou; + int fd; + unsigned int len; + + bzero(&sou, sizeof(sou)); + + /* + * Construct the unix domain socket address and attempt to connect + */ + fd = socket(AF_UNIX, SOCK_STREAM, 0); + if (fd >= 0) { + sou.sun_family = AF_UNIX; + if ((len = strlcpy(sou.sun_path, path, + sizeof(sou.sun_path))) >= sizeof(sou.sun_path)) { + errno = ENAMETOOLONG; + return (-1); + } + len = offsetof(struct sockaddr_un, sun_path[len+1]); + + if (connect(fd, (void *)&sou, len) < 0) { + close(fd); + fd = -1; + } + } + + /* + * handle the open flags by shutting down appropriate directions + */ + if (fd >= 0) { + switch(flags & O_ACCMODE) { + case O_RDONLY: + if (shutdown(fd, SHUT_WR) == -1) + warn(NULL); + break; + case O_WRONLY: + if (shutdown(fd, SHUT_RD) == -1) + warn(NULL); + break; + default: + break; + } + } + return(fd); +} + +#endif |