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Differential D20393 Diff 58286 head/usr.bin/tail/tail.c

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head/usr.bin/tail/tail.c

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"@(#) Copyright (c) 1991, 1993\n\ "@(#) Copyright (c) 1991, 1993\n\
The Regents of the University of California. All rights reserved.\n"; The Regents of the University of California. All rights reserved.\n";
#endif #endif
#ifndef lint #ifndef lint
static const char sccsid[] = "@(#)tail.c 8.1 (Berkeley) 6/6/93"; static const char sccsid[] = "@(#)tail.c 8.1 (Berkeley) 6/6/93";
#endif #endif
#include <sys/capsicum.h>
#include <sys/types.h> #include <sys/types.h>
#include <sys/stat.h> #include <sys/stat.h>
#include <capsicum_helpers.h>
#include <err.h> #include <err.h>
#include <errno.h> #include <errno.h>
#include <getopt.h> #include <getopt.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#include <unistd.h> #include <unistd.h>
#include <libcasper.h>
#include <casper/cap_fileargs.h>
#include "extern.h" #include "extern.h"
int Fflag, fflag, qflag, rflag, rval, no_files; int Fflag, fflag, qflag, rflag, rval, no_files;
static file_info_t *files; static file_info_t *files;
static void obsolete(char **); static void obsolete(char **);
static void usage(void); static void usage(void);
Show All 12 Linesmain(int argc, char *argv[])
struct stat sb; struct stat sb;
const char *fn; const char *fn;
FILE *fp; FILE *fp;
off_t off; off_t off;
enum STYLE style; enum STYLE style;
int i, ch, first; int i, ch, first;
file_info_t *file; file_info_t *file;
char *p; char *p;
fileargs_t *fa;
cap_rights_t rights;
cap_rights_init(&rights, CAP_FSTAT, CAP_FCNTL, CAP_MMAP_RW);
if (caph_rights_limit(STDIN_FILENO, &rights) < 0 ||
caph_limit_stderr() < 0 || caph_limit_stdout() < 0)
err(1, "can't limit stdio rights");
/* /*
* Tail's options are weird. First, -n10 is the same as -n-10, not * Tail's options are weird. First, -n10 is the same as -n-10, not
* -n+10. Second, the number options are 1 based and not offsets, * -n+10. Second, the number options are 1 based and not offsets,
* so -n+1 is the first line, and -c-1 is the last byte. Third, the * so -n+1 is the first line, and -c-1 is the last byte. Third, the
* number options for the -r option specify the number of things that * number options for the -r option specify the number of things that
* get displayed, not the starting point in the file. The one major * get displayed, not the starting point in the file. The one major
* incompatibility in this version as compared to historical versions * incompatibility in this version as compared to historical versions
* is that the 'r' option couldn't be modified by the -lbc options, * is that the 'r' option couldn't be modified by the -lbc options,
▲ Show 20 Lines • Show All 53 Lines • ▼ Show 20 Lines while ((ch = getopt_long(argc, argv, "+Fb:c:fn:qr", long_opts, NULL)) !=
default: default:
usage(); usage();
} }
argc -= optind; argc -= optind;
argv += optind; argv += optind;
no_files = argc ? argc : 1; no_files = argc ? argc : 1;
fa = fileargs_init(argc, argv, O_RDONLY, 0, &rights, FA_OPEN);
if (fa == NULL)
errx(1, "unable to init casper");
caph_cache_catpages();
if (caph_enter_casper() < 0)
err(1, "unable to enter capability mode");
/* /*
* If displaying in reverse, don't permit follow option, and convert * If displaying in reverse, don't permit follow option, and convert
* style values. * style values.
*/ */
if (rflag) { if (rflag) {
if (fflag) if (fflag)
usage(); usage();
if (style == FBYTES) if (style == FBYTES)
Show All 21 Lines files = (struct file_info *) malloc(no_files *
sizeof(struct file_info)); sizeof(struct file_info));
if (!files) if (!files)
err(1, "Couldn't malloc space for file descriptors."); err(1, "Couldn't malloc space for file descriptors.");
for (file = files; (fn = *argv++); file++) { for (file = files; (fn = *argv++); file++) {
file->file_name = strdup(fn); file->file_name = strdup(fn);
if (! file->file_name) if (! file->file_name)
errx(1, "Couldn't malloc space for file name."); errx(1, "Couldn't malloc space for file name.");
if ((file->fp = fopen(file->file_name, "r")) == NULL || if ((file->fp = fileargs_fopen(fa, file->file_name, "r")) == NULL ||
fstat(fileno(file->fp), &file->st)) { fstat(fileno(file->fp), &file->st)) {
if (file->fp != NULL) { if (file->fp != NULL) {
fclose(file->fp); fclose(file->fp);
file->fp = NULL; file->fp = NULL;
} }
if (!Fflag || errno != ENOENT) if (!Fflag || errno != ENOENT)
ierr(file->file_name); ierr(file->file_name);
} }
} }
follow(files, style, off); follow(files, style, off);
for (i = 0, file = files; i < no_files; i++, file++) { for (i = 0, file = files; i < no_files; i++, file++) {
free(file->file_name); free(file->file_name);
} }
free(files); free(files);
} else if (*argv) { } else if (*argv) {
for (first = 1; (fn = *argv++);) { for (first = 1; (fn = *argv++);) {
if ((fp = fopen(fn, "r")) == NULL || if ((fp = fileargs_fopen(fa, fn, "r")) == NULL ||
fstat(fileno(fp), &sb)) { fstat(fileno(fp), &sb)) {
ierr(fn); ierr(fn);
continue; continue;
} }
if (argc > 1 && !qflag) { if (argc > 1 && !qflag) {
printfn(fn, !first); printfn(fn, !first);
first = 0; first = 0;
} }
Show All 21 Lines if (lseek(fileno(stdin), (off_t)0, SEEK_CUR) == -1 &&
fflag = 0; /* POSIX.2 requires this. */ fflag = 0; /* POSIX.2 requires this. */
} }
if (rflag) if (rflag)
reverse(stdin, fn, style, off, &sb); reverse(stdin, fn, style, off, &sb);
else else
forward(stdin, fn, style, off, &sb); forward(stdin, fn, style, off, &sb);
} }
fileargs_free(fa);
exit(rval); exit(rval);
} }
/* /*
* Convert the obsolete argument form into something that getopt can handle. * Convert the obsolete argument form into something that getopt can handle.
* This means that anything of the form [+-][0-9][0-9]*[lbc][Ffr] that isn't * This means that anything of the form [+-][0-9][0-9]*[lbc][Ffr] that isn't
* the option argument for a -b, -c or -n option gets converted. * the option argument for a -b, -c or -n option gets converted.
*/ */
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