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echo: fix ENOSPC detection and some iffy code in \NNN handling 

function                                             old     new   delta
echo_main                                            330     302     -28

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
1_19_stable
Denys Vlasenko 2011-02-14 15:42:18 +01:00
parent 713e6d78e1
commit b9348440b0
7 changed files with 70 additions and 56 deletions
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112
coreutils/echo.c
View File

@ -50,7 +50,6 @@ int echo_main(int argc UNUSED_PARAM, char **argv)
char *out;
char *buffer;
unsigned buflen;
int r;
#if !ENABLE_FEATURE_FANCY_ECHO
enum {
eflag = '\\',
@ -59,40 +58,40 @@ int echo_main(int argc UNUSED_PARAM, char **argv)
argv++;
#else
const char *p;
char nflag = 1;
char eflag = 0;
while ((arg = *++argv) != NULL) {
if (!arg || arg[0] != '-')
break;
char n, e;
if (arg[0] != '-')
break; /* not an option arg, echo it */
/* If it appears that we are handling options, then make sure
* that all of the options specified are actually valid.
* Otherwise, the string should just be echoed.
*/
p = arg + 1;
if (!*p) /* A single '-', so echo it. */
break;
arg++;
n = nflag;
e = eflag;
do {
if (!strrchr("neE", *p))
if (*arg == 'n')
n = 0;
else if (*arg == 'e')
e = '\\';
else if (*arg != 'E') {
/* "-ccc" arg with one of c's invalid, echo it */
/* arg consisting from just "-" also handled here */
goto just_echo;
} while (*++p);
/* All of the options in this arg are valid, so handle them. */
p = arg + 1;
do {
if (*p == 'n')
nflag = 0;
if (*p == 'e')
eflag = '\\';
} while (*++p);
}
} while (*++arg);
nflag = n;
eflag = e;
}
just_echo:
#endif
buflen = 1;
buflen = 0;
pp = argv;
while ((arg = *pp) != NULL) {
buflen += strlen(arg) + 1;
@ -106,29 +105,32 @@ int echo_main(int argc UNUSED_PARAM, char **argv)
if (!eflag) {
/* optimization for very common case */
out = stpcpy(out, arg);
} else while ((c = *arg++)) {
if (c == eflag) { /* Check for escape seq. */
} else
while ((c = *arg++) != '\0') {
if (c == eflag) {
/* This is an "\x" sequence */
if (*arg == 'c') {
/* '\c' means cancel newline and
/* "\c" means cancel newline and
* ignore all subsequent chars. */
goto do_write;
}
#if !ENABLE_FEATURE_FANCY_ECHO
/* SUSv3 specifies that octal escapes must begin with '0'. */
if ( ((int)(unsigned char)(*arg) - '0') >= 8) /* '8' or bigger */
#endif
{
/* Since SUSv3 mandates a first digit of 0, 4-digit octals
* of the form \0### are accepted. */
if (*arg == '0') {
/* NB: don't turn "...\0" into "...\" */
if (arg[1] && ((unsigned char)(arg[1]) - '0') < 8) {
arg++;
}
/* Since SUSv3 mandates a first digit of 0, 4-digit octals
* of the form \0### are accepted. */
if (*arg == '0') {
if ((unsigned char)(arg[1] - '0') < 8) {
/* 2nd char is 0..7: skip leading '0' */
arg++;
}
/* bb_process_escape_sequence handles NUL correctly
* ("...\" case). */
c = bb_process_escape_sequence(&arg);
}
/* bb_process_escape_sequence handles NUL correctly
* ("...\" case). */
{
/* optimization: don't force arg to be on-stack,
* use another variable for that. ~30 bytes win */
const char *z = arg;
c = bb_process_escape_sequence(&z);
arg = z;
}
}
*out++ = c;
@ -144,16 +146,18 @@ int echo_main(int argc UNUSED_PARAM, char **argv)
}
do_write:
r = full_write(STDOUT_FILENO, buffer, out - buffer);
/* Careful to error out on partial writes too (think ENOSPC!) */
errno = 0;
/*r =*/ full_write(STDOUT_FILENO, buffer, out - buffer);
free(buffer);
if (r < 0) {
if (/*WRONG:r < 0*/ errno) {
bb_perror_msg(bb_msg_write_error);
return 1;
}
return 0;
}
/*-
/*
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
@ -239,7 +243,7 @@ int echo_main(int argc, char **argv)
goto just_echo;
do {
if (!strrchr("neE", *p))
if (!strchr("neE", *p))
goto just_echo;
} while (*++p);
@ -265,27 +269,23 @@ int echo_main(int argc, char **argv)
/* optimization for very common case */
p += strlen(arg);
} else while ((c = *arg++)) {
if (c == eflag) { /* Check for escape seq. */
if (c == eflag) {
/* This is an "\x" sequence */
if (*arg == 'c') {
/* '\c' means cancel newline and
/* "\c" means cancel newline and
* ignore all subsequent chars. */
cur_io->iov_len = p - (char*)cur_io->iov_base;
cur_io++;
goto ret;
}
#if !ENABLE_FEATURE_FANCY_ECHO
/* SUSv3 specifies that octal escapes must begin with '0'. */
if ( (((unsigned char)*arg) - '1') >= 7)
#endif
{
/* Since SUSv3 mandates a first digit of 0, 4-digit octals
* of the form \0### are accepted. */
if (*arg == '0' && ((unsigned char)(arg[1]) - '0') < 8) {
arg++;
}
/* bb_process_escape_sequence can handle nul correctly */
c = bb_process_escape_sequence( (void*) &arg);
/* Since SUSv3 mandates a first digit of 0, 4-digit octals
* of the form \0### are accepted. */
if (*arg == '0' && (unsigned char)(arg[1] - '0') < 8) {
arg++;
}
/* bb_process_escape_sequence can handle nul correctly */
c = bb_process_escape_sequence( (void*) &arg);
}
*p++ = c;
}

1
testsuite/echo/echo-prints-dash Normal file
View File

@ -0,0 +1 @@
test "`busybox echo - | od -t x1 | head -n 1`" = "0000000 2d 0a"

1
testsuite/echo/echo-prints-non-opts Normal file
View File

@ -0,0 +1 @@
test "`busybox echo -neEZ | od -t x1 | head -n 1`" = "0000000 2d 6e 65 45 5a 0a"

3
testsuite/echo/echo-prints-slash_00041 Normal file
View File

@ -0,0 +1,3 @@
# FEATURE: CONFIG_FEATURE_FANCY_ECHO
test "`busybox echo -ne '\00041z' | od -t x1 | head -n 1`" = "0000000 04 31 7a"

3
testsuite/echo/echo-prints-slash_0041 Normal file
View File

@ -0,0 +1,3 @@
# FEATURE: CONFIG_FEATURE_FANCY_ECHO
test "`busybox echo -ne '\0041z' | od -t x1 | head -n 1`" = "0000000 21 7a"

3
testsuite/echo/echo-prints-slash_041 Normal file
View File

@ -0,0 +1,3 @@
# FEATURE: CONFIG_FEATURE_FANCY_ECHO
test "`busybox echo -ne '\041z' | od -t x1 | head -n 1`" = "0000000 21 7a"

3
testsuite/echo/echo-prints-slash_41 Normal file
View File

@ -0,0 +1,3 @@
# FEATURE: CONFIG_FEATURE_FANCY_ECHO
test "`busybox echo -ne '\41z' | od -t x1 | head -n 1`" = "0000000 21 7a"