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Rewrote dd.

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This commit is contained in:
Matt Kraai 2000-12-18 21:38:57 +00:00
parent 0d2acb0ead
commit 24ac017961
9 changed files with 306 additions and 422 deletions
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17
applets/usage.c
View File

@ -170,10 +170,11 @@ const char dd_usage[] =
"\tcount=N\tcopy only N input blocks\n"
"\tskip=N\tskip N input blocks\n"
"\tseek=N\tskip N output blocks\n"
"\tconv=notrunc\t dont truncate of at end of write\n"
"\tconv=sync\t pad the last block with zeros until blocksize\n"
"\tconv=notrunc\tdon't truncate output file\n"
"\tconv=sync\tpad blocks with zeros\n"
"\n"
"Numbers may be suffixed by w (x2), k (x1024), b (x512), or M (x1024^2)\n"
"Numbers may be suffixed by c (x1), w (x2), b (x512), kD (x1000), k (x1024),\n"
"MD (x1000000), M (x1048576), GD (x1000000000) or G (x1073741824).\n"
#endif
;
#endif
@ -1185,20 +1186,20 @@ const char syslogd_usage[] =
#if defined BB_TAIL
const char tail_usage[] =
"tail [OPTION] [FILE]...\n"
"tail [OPTION]... [FILE]...\n"
#ifndef BB_FEATURE_TRIVIAL_HELP
"\nPrint last 10 lines of each FILE to standard output.\n"
"With more than one FILE, precede each with a header giving the\n"
"file name. With no FILE, or when FILE is -, read standard input.\n\n"
"Options:\n"
#ifndef BB_FEATURE_SIMPLE_TAIL
"\t-c=N[kbm]\toutput the last N bytes\n"
"\t-c N[kbm]\toutput the last N bytes\n"
#endif
"\t-n NUM\t\tPrint last NUM lines instead of first 10\n"
"\t-f\t\tOutput data as the file grows.\n"
"\t-n N[kbm]\tprint last N lines instead of last 10\n"
"\t-f\t\toutput data as the file grows\n"
#ifndef BB_FEATURE_SIMPLE_TAIL
"\t-q\t\tnever output headers giving file names\n"
"\t-s SEC\t\tWait SEC seconds between reads with -f\n"
"\t-s SEC\t\twait SEC seconds between reads with -f\n"
"\t-v\t\talways output headers giving file names\n\n"
"If the first character of N (bytes or lines) is a `+', output begins with \n"
"the Nth item from the start of each file, otherwise, print the last N items\n"

7
busybox.h
View File

@ -190,6 +190,13 @@ extern char *xstrdup (const char *s);
#endif
extern char *xstrndup (const char *s, int n);
struct suffix_mult {
char *suffix;
int mult;
};
extern unsigned long parse_number(const char *numstr, struct suffix_mult *suffixes);
/* These parse entries in /etc/passwd and /etc/group. This is desirable
* for BusyBox since we want to avoid using the glibc NSS stuff, which

243
coreutils/dd.c
View File

@ -2,15 +2,8 @@
/*
* Mini dd implementation for busybox
*
* Copyright (C) 1999, 2000 by Lineo, inc.
* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
*
* Based in part on code taken from sash.
* Copyright (c) 1999 by David I. Bell
* Permission is granted to use, distribute, or modify this source,
* provided that this copyright notice remains intact.
*
* Permission to distribute this code under the GPL has been granted.
* Copyright (C) 2000 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -28,154 +21,128 @@
*
*/
#include "busybox.h"
#include <features.h>
#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
#include <inttypes.h>
#else
typedef unsigned long long int uintmax_t;
#endif
extern int dd_main(int argc, char **argv)
static struct suffix_mult dd_suffixes[] = {
{ "c", 1 },
{ "w", 2 },
{ "b", 512 },
{ "kD", 1000 },
{ "k", 1024 },
{ "MD", 1000000 },
{ "M", 1048576 },
{ "GD", 1000000000 },
{ "G", 1073741824 },
{ NULL, 0 }
};
int dd_main(int argc, char **argv)
{
char *inFile = NULL;
char *outFile = NULL;
int inFd;
int outFd;
int inCc = 0;
int outCc;
int trunc=TRUE;
int sync=FALSE;
long blockSize = 512,ibs;
uintmax_t skipBlocks = 0;
uintmax_t seekBlocks = 0;
uintmax_t count = (uintmax_t) - 1;
uintmax_t inTotal = 0;
uintmax_t outTotal = 0;
uintmax_t totalSize;
int i, ifd, ofd, sync = FALSE, trunc = TRUE;
size_t in_full = 0, in_part = 0, out_full = 0, out_part = 0;
size_t bs = 512, count = -1;
ssize_t n;
off_t seek = 0, skip = 0;
FILE *statusfp;
char *infile = NULL, *outfile = NULL, *buf;
unsigned char buf[BUFSIZ];
char *keyword = NULL;
argc--;
argv++;
/* Parse any options */
while (argc) {
if (inFile == NULL && (strncmp(*argv, "if", 2) == 0))
inFile = ((strchr(*argv, '=')) + 1);
else if (outFile == NULL && (strncmp(*argv, "of", 2) == 0))
outFile = ((strchr(*argv, '=')) + 1);
else if (strncmp("count", *argv, 5) == 0) {
count = atoi_w_units((strchr(*argv, '=')) + 1);
if (count < 0) {
error_msg("Bad count value %s\n", *argv);
goto usage;
for (i = 1; i < argc; i++) {
if (strncmp("bs=", argv[i], 3) == 0)
bs = parse_number(argv[i]+3, dd_suffixes);
else if (strncmp("count=", argv[i], 6) == 0)
count = parse_number(argv[i]+6, dd_suffixes);
else if (strncmp("seek=", argv[i], 5) == 0)
seek = parse_number(argv[i]+5, dd_suffixes);
else if (strncmp("skip=", argv[i], 5) == 0)
skip = parse_number(argv[i]+5, dd_suffixes);
else if (strncmp("if=", argv[i], 3) == 0)
infile = argv[i]+3;
else if (strncmp("of=", argv[i], 3) == 0)
outfile = argv[i]+3;
else if (strncmp("conv=", argv[i], 5) == 0) {
buf = argv[i]+5;
while (1) {
if (strncmp("notrunc", buf, 7) == 0) {
trunc = FALSE;
buf += 7;
} else if (strncmp("sync", buf, 4) == 0) {
sync = TRUE;
buf += 4;
} else {
error_msg_and_die("invalid conversion `%s'\n", argv[i]+5);
}
if (buf[0] == '\0')
break;
if (buf[0] == ',')
buf++;
}
} else if (strncmp(*argv, "bs", 2) == 0) {
blockSize = atoi_w_units((strchr(*argv, '=')) + 1);
if (blockSize <= 0) {
error_msg("Bad block size value %s\n", *argv);
goto usage;
}
} else if (strncmp(*argv, "skip", 4) == 0) {
skipBlocks = atoi_w_units((strchr(*argv, '=')) + 1);
if (skipBlocks <= 0) {
error_msg("Bad skip value %s\n", *argv);
goto usage;
}
} else if (strncmp(*argv, "seek", 4) == 0) {
seekBlocks = atoi_w_units((strchr(*argv, '=')) + 1);
if (seekBlocks <= 0) {
error_msg("Bad seek value %s\n", *argv);
goto usage;
}
} else if (strncmp(*argv, "conv", 4) == 0) {
keyword = (strchr(*argv, '=') + 1);
if (strcmp(keyword, "notrunc") == 0)
trunc=FALSE;
if (strcmp(keyword, "sync") == 0)
sync=TRUE;
} else {
goto usage;
}
argc--;
argv++;
} else
usage(dd_usage);
}
if (inFile == NULL)
inFd = fileno(stdin);
else
inFd = open(inFile, 0);
buf = xmalloc(bs);
if (inFd < 0) {
/* Note that we are not freeing buf or closing
* files here to save a few bytes. This exits
* here anyways... */
/* free(buf); */
perror_msg_and_die("%s", inFile);
if (infile != NULL) {
if ((ifd = open(infile, O_RDONLY)) < 0)
perror_msg_and_die("%s", infile);
} else {
ifd = STDIN_FILENO;
infile = "standard input";
}
if (outFile == NULL)
outFd = fileno(stdout);
else
outFd = open(outFile, O_WRONLY | O_CREAT, 0666);
if (outFd < 0) {
/* Note that we are not freeing buf or closing
* files here to save a few bytes. This exits
* here anyways... */
/* close(inFd);
free(buf); */
perror_msg_and_die("%s", outFile);
if (outfile != NULL) {
if ((ofd = open(outfile, O_WRONLY | O_CREAT, 0666)) < 0)
perror_msg_and_die("%s", outfile);
statusfp = stdout;
} else {
ofd = STDOUT_FILENO;
outfile = "standard output";
statusfp = stderr;
}
lseek(inFd, (off_t) (skipBlocks * blockSize), SEEK_SET);
lseek(outFd, (off_t) (seekBlocks * blockSize), SEEK_SET);
totalSize=count*blockSize;
if (skip) {
if (lseek(ifd, skip * bs, SEEK_CUR) < 0)
perror_msg_and_die("%s", infile);
}
ibs=blockSize;
if (ibs > BUFSIZ)
ibs=BUFSIZ;
while (totalSize > outTotal) {
inCc = full_read(inFd, buf, ibs);
inTotal += inCc;
if ( (sync==TRUE) && (inCc>0) )
while (inCc<ibs)
buf[inCc++]='\0';
if (seek) {
if (lseek(ofd, seek * bs, SEEK_CUR) < 0)
perror_msg_and_die("%s", outfile);
}
if ((outCc = full_write(outFd, buf, inCc)) < 1){
if (outCc < 0 ){
perror("Error during write");
}
if (trunc) {
if (ftruncate(ofd, seek * bs) < 0)
perror_msg_and_die("%s", outfile);
}
while (in_full + in_part != count) {
n = safe_read(ifd, buf, bs);
if (n < 0)
perror_msg_and_die("%s", infile);
if (n == 0)
break;
if (n == bs)
in_full++;
else
in_part++;
if (sync) {
memset(buf + n, '\0', bs - n);
n = bs;
}
outTotal += outCc;
}
if (trunc == TRUE) {
ftruncate(outFd, lseek(outFd, 0, SEEK_CUR));
n = full_write(ofd, buf, n);
if (n < 0)
perror_msg_and_die("%s", outfile);
if (n == bs)
out_full++;
else
out_part++;
}
/* Note that we are not freeing memory or closing
* files here, to save a few bytes. */
#ifdef BB_FEATURE_CLEAN_UP
close(inFd);
close(outFd);
#endif
printf("%ld+%d records in\n", (long) (inTotal / blockSize),
(inTotal % blockSize) != 0);
printf("%ld+%d records out\n", (long) (outTotal / blockSize),
(outTotal % blockSize) != 0);
fprintf(statusfp, "%d+%d records in\n", in_full, in_part);
fprintf(statusfp, "%d+%d records out\n", out_full, out_part);
return EXIT_SUCCESS;
usage:
usage(dd_usage);
}

48
coreutils/tail.c
View File

@ -61,6 +61,13 @@ static char verbose = 0;
static off_t units=0;
static struct suffix_mult tail_suffixes[] = {
{ "b", 512 },
{ "k", 1024 },
{ "m", 1048576 },
{ NULL, 0 }
};
static int tail_stream(int fd)
{
ssize_t startpoint;
@ -170,32 +177,6 @@ int tail_main(int argc, char **argv)
switch (opt) {
#ifndef BB_FEATURE_SIMPLE_TAIL
case 'c':
unit_type = BYTES;
test = atoi(optarg);
if(test==0)
usage(tail_usage);
if(optarg[strlen(optarg)-1]>'9') {
switch (optarg[strlen(optarg)-1]) {
case 'b':
test *= 512;
break;
case 'k':
test *= 1024;
break;
case 'm':
test *= (1024 * 1024);
break;
default:
fprintf(stderr,"Size must be b,k, or m.");
usage(tail_usage);
}
}
if(optarg[0]=='+')
units=test+1;
else
units=-(test+1);
break;
case 'q':
show_headers = 0;
break;
@ -207,15 +188,12 @@ int tail_main(int argc, char **argv)
case 'v':
verbose = 1;
break;
case 'c':
unit_type = BYTES;
/* FALLS THROUGH */
#endif
case 'f':
follow = 1;
break;
case 'h':
usage(tail_usage);
break;
case 'n':
test = atoi(optarg);
test = parse_number(optarg, tail_suffixes);
if (test) {
if (optarg[0] == '+')
units = test;
@ -224,8 +202,10 @@ int tail_main(int argc, char **argv)
} else
usage(tail_usage);
break;
case 'f':
follow = 1;
break;
default:
error_msg("\nUnknown arg: %c.\n\n",optopt);
usage(tail_usage);
}
}

243
dd.c
View File

@ -2,15 +2,8 @@
/*
* Mini dd implementation for busybox
*
* Copyright (C) 1999, 2000 by Lineo, inc.
* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
*
* Based in part on code taken from sash.
* Copyright (c) 1999 by David I. Bell
* Permission is granted to use, distribute, or modify this source,
* provided that this copyright notice remains intact.
*
* Permission to distribute this code under the GPL has been granted.
* Copyright (C) 2000 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -28,154 +21,128 @@
*
*/
#include "busybox.h"
#include <features.h>
#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
#include <inttypes.h>
#else
typedef unsigned long long int uintmax_t;
#endif
extern int dd_main(int argc, char **argv)
static struct suffix_mult dd_suffixes[] = {
{ "c", 1 },
{ "w", 2 },
{ "b", 512 },
{ "kD", 1000 },
{ "k", 1024 },
{ "MD", 1000000 },
{ "M", 1048576 },
{ "GD", 1000000000 },
{ "G", 1073741824 },
{ NULL, 0 }
};
int dd_main(int argc, char **argv)
{
char *inFile = NULL;
char *outFile = NULL;
int inFd;
int outFd;
int inCc = 0;
int outCc;
int trunc=TRUE;
int sync=FALSE;
long blockSize = 512,ibs;
uintmax_t skipBlocks = 0;
uintmax_t seekBlocks = 0;
uintmax_t count = (uintmax_t) - 1;
uintmax_t inTotal = 0;
uintmax_t outTotal = 0;
uintmax_t totalSize;
int i, ifd, ofd, sync = FALSE, trunc = TRUE;
size_t in_full = 0, in_part = 0, out_full = 0, out_part = 0;
size_t bs = 512, count = -1;
ssize_t n;
off_t seek = 0, skip = 0;
FILE *statusfp;
char *infile = NULL, *outfile = NULL, *buf;
unsigned char buf[BUFSIZ];
char *keyword = NULL;
argc--;
argv++;
/* Parse any options */
while (argc) {
if (inFile == NULL && (strncmp(*argv, "if", 2) == 0))
inFile = ((strchr(*argv, '=')) + 1);
else if (outFile == NULL && (strncmp(*argv, "of", 2) == 0))
outFile = ((strchr(*argv, '=')) + 1);
else if (strncmp("count", *argv, 5) == 0) {
count = atoi_w_units((strchr(*argv, '=')) + 1);
if (count < 0) {
error_msg("Bad count value %s\n", *argv);
goto usage;
for (i = 1; i < argc; i++) {
if (strncmp("bs=", argv[i], 3) == 0)
bs = parse_number(argv[i]+3, dd_suffixes);
else if (strncmp("count=", argv[i], 6) == 0)
count = parse_number(argv[i]+6, dd_suffixes);
else if (strncmp("seek=", argv[i], 5) == 0)
seek = parse_number(argv[i]+5, dd_suffixes);
else if (strncmp("skip=", argv[i], 5) == 0)
skip = parse_number(argv[i]+5, dd_suffixes);
else if (strncmp("if=", argv[i], 3) == 0)
infile = argv[i]+3;
else if (strncmp("of=", argv[i], 3) == 0)
outfile = argv[i]+3;
else if (strncmp("conv=", argv[i], 5) == 0) {
buf = argv[i]+5;
while (1) {
if (strncmp("notrunc", buf, 7) == 0) {
trunc = FALSE;
buf += 7;
} else if (strncmp("sync", buf, 4) == 0) {
sync = TRUE;
buf += 4;
} else {
error_msg_and_die("invalid conversion `%s'\n", argv[i]+5);
}
if (buf[0] == '\0')
break;
if (buf[0] == ',')
buf++;
}
} else if (strncmp(*argv, "bs", 2) == 0) {
blockSize = atoi_w_units((strchr(*argv, '=')) + 1);
if (blockSize <= 0) {
error_msg("Bad block size value %s\n", *argv);
goto usage;
}
} else if (strncmp(*argv, "skip", 4) == 0) {
skipBlocks = atoi_w_units((strchr(*argv, '=')) + 1);
if (skipBlocks <= 0) {
error_msg("Bad skip value %s\n", *argv);
goto usage;
}
} else if (strncmp(*argv, "seek", 4) == 0) {
seekBlocks = atoi_w_units((strchr(*argv, '=')) + 1);
if (seekBlocks <= 0) {
error_msg("Bad seek value %s\n", *argv);
goto usage;
}
} else if (strncmp(*argv, "conv", 4) == 0) {
keyword = (strchr(*argv, '=') + 1);
if (strcmp(keyword, "notrunc") == 0)
trunc=FALSE;
if (strcmp(keyword, "sync") == 0)
sync=TRUE;
} else {
goto usage;
}
argc--;
argv++;
} else
usage(dd_usage);
}
if (inFile == NULL)
inFd = fileno(stdin);
else
inFd = open(inFile, 0);
buf = xmalloc(bs);
if (inFd < 0) {
/* Note that we are not freeing buf or closing
* files here to save a few bytes. This exits
* here anyways... */
/* free(buf); */
perror_msg_and_die("%s", inFile);
if (infile != NULL) {
if ((ifd = open(infile, O_RDONLY)) < 0)
perror_msg_and_die("%s", infile);
} else {
ifd = STDIN_FILENO;
infile = "standard input";
}
if (outFile == NULL)
outFd = fileno(stdout);
else
outFd = open(outFile, O_WRONLY | O_CREAT, 0666);
if (outFd < 0) {
/* Note that we are not freeing buf or closing
* files here to save a few bytes. This exits
* here anyways... */
/* close(inFd);
free(buf); */
perror_msg_and_die("%s", outFile);
if (outfile != NULL) {
if ((ofd = open(outfile, O_WRONLY | O_CREAT, 0666)) < 0)
perror_msg_and_die("%s", outfile);
statusfp = stdout;
} else {
ofd = STDOUT_FILENO;
outfile = "standard output";
statusfp = stderr;
}
lseek(inFd, (off_t) (skipBlocks * blockSize), SEEK_SET);
lseek(outFd, (off_t) (seekBlocks * blockSize), SEEK_SET);
totalSize=count*blockSize;
if (skip) {
if (lseek(ifd, skip * bs, SEEK_CUR) < 0)
perror_msg_and_die("%s", infile);
}
ibs=blockSize;
if (ibs > BUFSIZ)
ibs=BUFSIZ;
while (totalSize > outTotal) {
inCc = full_read(inFd, buf, ibs);
inTotal += inCc;
if ( (sync==TRUE) && (inCc>0) )
while (inCc<ibs)
buf[inCc++]='\0';
if (seek) {
if (lseek(ofd, seek * bs, SEEK_CUR) < 0)
perror_msg_and_die("%s", outfile);
}
if ((outCc = full_write(outFd, buf, inCc)) < 1){
if (outCc < 0 ){
perror("Error during write");
}
if (trunc) {
if (ftruncate(ofd, seek * bs) < 0)
perror_msg_and_die("%s", outfile);
}
while (in_full + in_part != count) {
n = safe_read(ifd, buf, bs);
if (n < 0)
perror_msg_and_die("%s", infile);
if (n == 0)
break;
if (n == bs)
in_full++;
else
in_part++;
if (sync) {
memset(buf + n, '\0', bs - n);
n = bs;
}
outTotal += outCc;
}
if (trunc == TRUE) {
ftruncate(outFd, lseek(outFd, 0, SEEK_CUR));
n = full_write(ofd, buf, n);
if (n < 0)
perror_msg_and_die("%s", outfile);
if (n == bs)
out_full++;
else
out_part++;
}
/* Note that we are not freeing memory or closing
* files here, to save a few bytes. */
#ifdef BB_FEATURE_CLEAN_UP
close(inFd);
close(outFd);
#endif
printf("%ld+%d records in\n", (long) (inTotal / blockSize),
(inTotal % blockSize) != 0);
printf("%ld+%d records out\n", (long) (outTotal / blockSize),
(outTotal % blockSize) != 0);
fprintf(statusfp, "%d+%d records in\n", in_full, in_part);
fprintf(statusfp, "%d+%d records out\n", out_full, out_part);
return EXIT_SUCCESS;
usage:
usage(dd_usage);
}

7
include/busybox.h
View File

@ -190,6 +190,13 @@ extern char *xstrdup (const char *s);
#endif
extern char *xstrndup (const char *s, int n);
struct suffix_mult {
char *suffix;
int mult;
};
extern unsigned long parse_number(const char *numstr, struct suffix_mult *suffixes);
/* These parse entries in /etc/passwd and /etc/group. This is desirable
* for BusyBox since we want to avoid using the glibc NSS stuff, which

48
tail.c
View File

@ -61,6 +61,13 @@ static char verbose = 0;
static off_t units=0;
static struct suffix_mult tail_suffixes[] = {
{ "b", 512 },
{ "k", 1024 },
{ "m", 1048576 },
{ NULL, 0 }
};
static int tail_stream(int fd)
{
ssize_t startpoint;
@ -170,32 +177,6 @@ int tail_main(int argc, char **argv)
switch (opt) {
#ifndef BB_FEATURE_SIMPLE_TAIL
case 'c':
unit_type = BYTES;
test = atoi(optarg);
if(test==0)
usage(tail_usage);
if(optarg[strlen(optarg)-1]>'9') {
switch (optarg[strlen(optarg)-1]) {
case 'b':
test *= 512;
break;
case 'k':
test *= 1024;
break;
case 'm':
test *= (1024 * 1024);
break;
default:
fprintf(stderr,"Size must be b,k, or m.");
usage(tail_usage);
}
}
if(optarg[0]=='+')
units=test+1;
else
units=-(test+1);
break;
case 'q':
show_headers = 0;
break;
@ -207,15 +188,12 @@ int tail_main(int argc, char **argv)
case 'v':
verbose = 1;
break;
case 'c':
unit_type = BYTES;
/* FALLS THROUGH */
#endif
case 'f':
follow = 1;
break;
case 'h':
usage(tail_usage);
break;
case 'n':
test = atoi(optarg);
test = parse_number(optarg, tail_suffixes);
if (test) {
if (optarg[0] == '+')
units = test;
@ -224,8 +202,10 @@ int tail_main(int argc, char **argv)
} else
usage(tail_usage);
break;
case 'f':
follow = 1;
break;
default:
error_msg("\nUnknown arg: %c.\n\n",optopt);
usage(tail_usage);
}
}

17
usage.c
View File

@ -170,10 +170,11 @@ const char dd_usage[] =
"\tcount=N\tcopy only N input blocks\n"
"\tskip=N\tskip N input blocks\n"
"\tseek=N\tskip N output blocks\n"
"\tconv=notrunc\t dont truncate of at end of write\n"
"\tconv=sync\t pad the last block with zeros until blocksize\n"
"\tconv=notrunc\tdon't truncate output file\n"
"\tconv=sync\tpad blocks with zeros\n"
"\n"
"Numbers may be suffixed by w (x2), k (x1024), b (x512), or M (x1024^2)\n"
"Numbers may be suffixed by c (x1), w (x2), b (x512), kD (x1000), k (x1024),\n"
"MD (x1000000), M (x1048576), GD (x1000000000) or G (x1073741824).\n"
#endif
;
#endif
@ -1185,20 +1186,20 @@ const char syslogd_usage[] =
#if defined BB_TAIL
const char tail_usage[] =
"tail [OPTION] [FILE]...\n"
"tail [OPTION]... [FILE]...\n"
#ifndef BB_FEATURE_TRIVIAL_HELP
"\nPrint last 10 lines of each FILE to standard output.\n"
"With more than one FILE, precede each with a header giving the\n"
"file name. With no FILE, or when FILE is -, read standard input.\n\n"
"Options:\n"
#ifndef BB_FEATURE_SIMPLE_TAIL
"\t-c=N[kbm]\toutput the last N bytes\n"
"\t-c N[kbm]\toutput the last N bytes\n"
#endif
"\t-n NUM\t\tPrint last NUM lines instead of first 10\n"
"\t-f\t\tOutput data as the file grows.\n"
"\t-n N[kbm]\tprint last N lines instead of last 10\n"
"\t-f\t\toutput data as the file grows\n"
#ifndef BB_FEATURE_SIMPLE_TAIL
"\t-q\t\tnever output headers giving file names\n"
"\t-s SEC\t\tWait SEC seconds between reads with -f\n"
"\t-s SEC\t\twait SEC seconds between reads with -f\n"
"\t-v\t\talways output headers giving file names\n\n"
"If the first character of N (bytes or lines) is a `+', output begins with \n"
"the Nth item from the start of each file, otherwise, print the last N items\n"

98
utility.c
View File

@ -562,10 +562,9 @@ int full_write(int fd, const char *buf, int len)
return total;
}
#endif /* BB_TAR || BB_CP_MV || BB_AR */
#endif
#if defined BB_TAR || defined BB_TAIL || defined BB_AR || defined BB_SH || defined BB_CP_MV || defined BB_DD
#if defined BB_AR || defined BB_CP_MV || defined BB_SH || defined BB_TAR
/*
* Read all of the supplied buffer from a file.
* This does multiple reads as necessary.
@ -1215,58 +1214,6 @@ extern struct mntent *find_mount_point(const char *name, const char *table)
}
#endif /* BB_DF || BB_MTAB */
#if defined BB_DD || defined BB_TAIL
/*
* Read a number with a possible multiplier.
* Returns -1 if the number format is illegal.
*/
extern long atoi_w_units(const char *cp)
{
long value;
if (!is_decimal(*cp))
return -1;
value = 0;
while (is_decimal(*cp))
value = value * 10 + *cp++ - '0';
switch (*cp++) {
case 'M':
case 'm': /* `tail' uses it traditionally */
value *= 1048576;
break;
case 'k':
value *= 1024;
break;
case 'b':
value *= 512;
break;
case 'w':
value *= 2;
break;
case '\0':
return value;
default:
return -1;
}
if (*cp)
return -1;
return value;
}
#endif /* BB_DD || BB_TAIL */
#if defined BB_INIT || defined BB_SYSLOGD
/* try to open up the specified device */
extern int device_open(char *device, int mode)
@ -1313,11 +1260,11 @@ extern pid_t* find_pid_by_name( char* pidName)
/* open device */
fd = open(device, O_RDONLY);
if (fd < 0)
perror_msg_and_die( "open failed for `%s'", device);
perror_msg_and_die("open failed for `%s'", device);
/* Find out how many processes there are */
if (ioctl (fd, DEVPS_GET_NUM_PIDS, &num_pids)<0)
perror_msg_and_die( "\nDEVPS_GET_PID_LIST");
perror_msg_and_die("\nDEVPS_GET_PID_LIST");
/* Allocate some memory -- grab a few extras just in case
* some new processes start up while we wait. The kernel will
@ -1328,7 +1275,7 @@ extern pid_t* find_pid_by_name( char* pidName)
/* Now grab the pid list */
if (ioctl (fd, DEVPS_GET_PID_LIST, pid_array)<0)
perror_msg_and_die( "\nDEVPS_GET_PID_LIST");
perror_msg_and_die("\nDEVPS_GET_PID_LIST");
/* Now search for a match */
for (i=1, j=0; i<pid_array[0] ; i++) {
@ -1337,7 +1284,7 @@ extern pid_t* find_pid_by_name( char* pidName)
info.pid = pid_array[i];
if (ioctl (fd, DEVPS_GET_PID_INFO, &info)<0)
perror_msg_and_die( "\nDEVPS_GET_PID_INFO");
perror_msg_and_die("\nDEVPS_GET_PID_INFO");
/* Make sure we only match on the process name */
p=info.command_line+1;
@ -1361,7 +1308,7 @@ extern pid_t* find_pid_by_name( char* pidName)
/* close device */
if (close (fd) != 0)
perror_msg_and_die( "close failed for `%s'", device);
perror_msg_and_die("close failed for `%s'", device);
return pidList;
}
@ -1387,7 +1334,7 @@ extern pid_t* find_pid_by_name( char* pidName)
dir = opendir("/proc");
if (!dir)
perror_msg_and_die( "Cannot open /proc");
perror_msg_and_die("Cannot open /proc");
while ((next = readdir(dir)) != NULL) {
FILE *status;
@ -1791,7 +1738,34 @@ int applet_name_compare(const void *x, const void *y)
return strcmp(applet1->name, applet2->name);
}
#if defined BB_NC
#if defined BB_DD || defined BB_TAIL
unsigned long parse_number(const char *numstr, struct suffix_mult *suffixes)
{
struct suffix_mult *sm;
unsigned long int ret;
int len;
char *end;
ret = strtoul(numstr, &end, 10);
if (numstr == end)
error_msg_and_die("invalid number `%s'\n", numstr);
while (end[0] != '\0') {
for (sm = suffixes; sm->suffix != NULL; sm++) {
len = strlen(sm->suffix);
if (strncmp(sm->suffix, end, len) == 0) {
ret *= sm->mult;
end += len;
break;
}
}
if (sm->suffix == NULL)
error_msg_and_die("invalid number `%s'\n", numstr);
}
return ret;
}
#endif
#if defined BB_DD || defined BB_NC
ssize_t safe_read(int fd, void *buf, size_t count)
{
ssize_t n;