*
* Original copyright notice is retained at the end of this file.
*/
-
-/* BB_AUDIT SUSv3 compliant -- unless configured as fancy echo. */
-/* http://www.opengroup.org/onlinepubs/007904975/utilities/echo.html */
-
/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
*
* Because of behavioral differences, implemented configurable SUSv3
* 2) SUSv3 specifies that octal escapes are of the form \0{#{#{#}}}.
* The previous version did not allow 4-digit octals.
*/
+//config:config ECHO
+//config: bool "echo (basic SuSv3 version taking no options)"
+//config: default y
+//config: help
+//config: echo is used to print a specified string to stdout.
+//config:
+//config:# this entry also appears in shell/Config.in, next to the echo builtin
+//config:config FEATURE_FANCY_ECHO
+//config: bool "Enable -n and -e options"
+//config: default y
+//config: depends on ECHO || ASH_ECHO || HUSH_ECHO
+
+//applet:IF_ECHO(APPLET_NOFORK(echo, echo, BB_DIR_BIN, BB_SUID_DROP, echo))
+
+//kbuild:lib-$(CONFIG_ECHO) += echo.o
+
+//kbuild:lib-$(CONFIG_ASH_ECHO) += echo.o
+//kbuild:lib-$(CONFIG_HUSH_ECHO) += echo.o
+
+/* BB_AUDIT SUSv3 compliant -- unless configured as fancy echo. */
+/* http://www.opengroup.org/onlinepubs/007904975/utilities/echo.html */
+
+//usage:#define echo_trivial_usage
+//usage: IF_FEATURE_FANCY_ECHO("[-neE] ") "[ARG]..."
+//usage:#define echo_full_usage "\n\n"
+//usage: "Print the specified ARGs to stdout"
+//usage: IF_FEATURE_FANCY_ECHO( "\n"
+//usage: "\n -n Suppress trailing newline"
+//usage: "\n -e Interpret backslash escapes (i.e., \\t=tab)"
+//usage: "\n -E Don't interpret backslash escapes (default)"
+//usage: )
+//usage:
+//usage:#define echo_example_usage
+//usage: "$ echo \"Erik is cool\"\n"
+//usage: "Erik is cool\n"
+//usage: IF_FEATURE_FANCY_ECHO("$ echo -e \"Erik\\nis\\ncool\"\n"
+//usage: "Erik\n"
+//usage: "is\n"
+//usage: "cool\n"
+//usage: "$ echo \"Erik\\nis\\ncool\"\n"
+//usage: "Erik\\nis\\ncool\n")
#include "libbb.h"
char *out;
char *buffer;
unsigned buflen;
- int r;
#if !ENABLE_FEATURE_FANCY_ECHO
enum {
- eflag = '\\',
+ eflag = 0, /* 0 -- disable escape sequences */
nflag = 1, /* 1 -- print '\n' */
};
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;
pp++;
}
- out = buffer = xmalloc(buflen);
+ out = buffer = xmalloc(buflen + 1); /* +1 is needed for "no args" case */
while ((arg = *argv) != NULL) {
int c;
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;
}
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.
*
* 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
+ * 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
goto just_echo;
do {
- if (!strrchr("neE", *p))
+ if (!strchr("neE", *p))
goto just_echo;
} while (*++p);
/* 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;
}
projects / oweals / busybox.git / blobdiff