busybox/coreutils/expand.c
Denys Vlasenko f560422fa0 Big cleanup in config help and description
Redundant help texts (one which only repeats the description)
are deleted.

Descriptions and help texts are trimmed.

Some config options are moved, even across menus.

No config option _names_ are changed.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-01-10 14:58:54 +01:00

254 lines
6.5 KiB
C

/* expand - convert tabs to spaces
* unexpand - convert spaces to tabs
*
* Copyright (C) 89, 91, 1995-2006 Free Software Foundation, Inc.
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*
* David MacKenzie <djm@gnu.ai.mit.edu>
*
* Options for expand:
* -t num --tabs=NUM Convert tabs to num spaces (default 8 spaces).
* -i --initial Only convert initial tabs on each line to spaces.
*
* Options for unexpand:
* -a --all Convert all blanks, instead of just initial blanks.
* -f --first-only Convert only leading sequences of blanks (default).
* -t num --tabs=NUM Have tabs num characters apart instead of 8.
*
* Busybox version (C) 2007 by Tito Ragusa <farmatito@tiscali.it>
*
* Caveat: this versions of expand and unexpand don't accept tab lists.
*/
//config:config EXPAND
//config: bool "expand"
//config: default y
//config: help
//config: By default, convert all tabs to spaces.
//config:
//config:config FEATURE_EXPAND_LONG_OPTIONS
//config: bool "Enable long options"
//config: default y
//config: depends on EXPAND && LONG_OPTS
//config:
//config:config UNEXPAND
//config: bool "unexpand"
//config: default y
//config: help
//config: By default, convert only leading sequences of blanks to tabs.
//config:
//config:config FEATURE_UNEXPAND_LONG_OPTIONS
//config: bool "Enable long options"
//config: default y
//config: depends on UNEXPAND && LONG_OPTS
//applet:IF_EXPAND(APPLET(expand, BB_DIR_USR_BIN, BB_SUID_DROP))
//applet:IF_UNEXPAND(APPLET_ODDNAME(unexpand, expand, BB_DIR_USR_BIN, BB_SUID_DROP, unexpand))
//kbuild:lib-$(CONFIG_EXPAND) += expand.o
//kbuild:lib-$(CONFIG_UNEXPAND) += expand.o
//usage:#define expand_trivial_usage
//usage: "[-i] [-t N] [FILE]..."
//usage:#define expand_full_usage "\n\n"
//usage: "Convert tabs to spaces, writing to stdout\n"
//usage: IF_FEATURE_EXPAND_LONG_OPTIONS(
//usage: "\n -i,--initial Don't convert tabs after non blanks"
//usage: "\n -t,--tabs=N Tabstops every N chars"
//usage: )
//usage: IF_NOT_FEATURE_EXPAND_LONG_OPTIONS(
//usage: "\n -i Don't convert tabs after non blanks"
//usage: "\n -t Tabstops every N chars"
//usage: )
//usage:#define unexpand_trivial_usage
//usage: "[-fa][-t N] [FILE]..."
//usage:#define unexpand_full_usage "\n\n"
//usage: "Convert spaces to tabs, writing to stdout\n"
//usage: IF_FEATURE_UNEXPAND_LONG_OPTIONS(
//usage: "\n -a,--all Convert all blanks"
//usage: "\n -f,--first-only Convert only leading blanks"
//usage: "\n -t,--tabs=N Tabstops every N chars"
//usage: )
//usage: IF_NOT_FEATURE_UNEXPAND_LONG_OPTIONS(
//usage: "\n -a Convert all blanks"
//usage: "\n -f Convert only leading blanks"
//usage: "\n -t N Tabstops every N chars"
//usage: )
#include "libbb.h"
#include "unicode.h"
enum {
OPT_INITIAL = 1 << 0,
OPT_TABS = 1 << 1,
OPT_ALL = 1 << 2,
};
#if ENABLE_EXPAND
static void expand(FILE *file, unsigned tab_size, unsigned opt)
{
char *line;
while ((line = xmalloc_fgets(file)) != NULL) {
unsigned char c;
char *ptr;
char *ptr_strbeg;
ptr = ptr_strbeg = line;
while ((c = *ptr) != '\0') {
if ((opt & OPT_INITIAL) && !isblank(c)) {
/* not space or tab */
break;
}
if (c == '\t') {
unsigned len;
*ptr = '\0';
# if ENABLE_UNICODE_SUPPORT
len = unicode_strwidth(ptr_strbeg);
# else
len = ptr - ptr_strbeg;
# endif
len = tab_size - (len % tab_size);
/*while (ptr[1] == '\t') { ptr++; len += tab_size; } - can handle many tabs at once */
printf("%s%*s", ptr_strbeg, len, "");
ptr_strbeg = ptr + 1;
}
ptr++;
}
fputs(ptr_strbeg, stdout);
free(line);
}
}
#endif
#if ENABLE_UNEXPAND
static void unexpand(FILE *file, unsigned tab_size, unsigned opt)
{
char *line;
while ((line = xmalloc_fgets(file)) != NULL) {
char *ptr = line;
unsigned column = 0;
while (*ptr) {
unsigned n;
unsigned len = 0;
while (*ptr == ' ') {
ptr++;
len++;
}
column += len;
if (*ptr == '\t') {
column += tab_size - (column % tab_size);
ptr++;
continue;
}
n = column / tab_size;
if (n) {
len = column = column % tab_size;
while (n--)
putchar('\t');
}
if ((opt & OPT_INITIAL) && ptr != line) {
printf("%*s%s", len, "", ptr);
break;
}
n = strcspn(ptr, "\t ");
printf("%*s%.*s", len, "", n, ptr);
# if ENABLE_UNICODE_SUPPORT
{
char c = ptr[n];
ptr[n] = '\0';
len = unicode_strwidth(ptr);
ptr[n] = c;
}
# else
len = n;
# endif
ptr += n;
column = (column + len) % tab_size;
}
free(line);
}
}
#endif
int expand_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int expand_main(int argc UNUSED_PARAM, char **argv)
{
/* Default 8 spaces for 1 tab */
const char *opt_t = "8";
FILE *file;
unsigned tab_size;
unsigned opt;
int exit_status = EXIT_SUCCESS;
#if ENABLE_FEATURE_EXPAND_LONG_OPTIONS
static const char expand_longopts[] ALIGN1 =
/* name, has_arg, val */
"initial\0" No_argument "i"
"tabs\0" Required_argument "t"
;
#endif
#if ENABLE_FEATURE_UNEXPAND_LONG_OPTIONS
static const char unexpand_longopts[] ALIGN1 =
/* name, has_arg, val */
"first-only\0" No_argument "i"
"tabs\0" Required_argument "t"
"all\0" No_argument "a"
;
#endif
init_unicode();
if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e')) {
IF_FEATURE_EXPAND_LONG_OPTIONS(applet_long_options = expand_longopts);
opt = getopt32(argv, "it:", &opt_t);
} else {
IF_FEATURE_UNEXPAND_LONG_OPTIONS(applet_long_options = unexpand_longopts);
/* -t NUM sets also -a */
opt_complementary = "ta";
opt = getopt32(argv, "ft:a", &opt_t);
/* -f --first-only is the default */
if (!(opt & OPT_ALL)) opt |= OPT_INITIAL;
}
tab_size = xatou_range(opt_t, 1, UINT_MAX);
argv += optind;
if (!*argv) {
*--argv = (char*)bb_msg_standard_input;
}
do {
file = fopen_or_warn_stdin(*argv);
if (!file) {
exit_status = EXIT_FAILURE;
continue;
}
if (ENABLE_EXPAND && (!ENABLE_UNEXPAND || applet_name[0] == 'e'))
IF_EXPAND(expand(file, tab_size, opt));
else
IF_UNEXPAND(unexpand(file, tab_size, opt));
/* Check and close the file */
if (fclose_if_not_stdin(file)) {
bb_simple_perror_msg(*argv);
exit_status = EXIT_FAILURE;
}
/* If stdin also clear EOF */
if (file == stdin)
clearerr(file);
} while (*++argv);
/* Now close stdin also */
/* (if we didn't read from it, it's a no-op) */
if (fclose(stdin))
bb_perror_msg_and_die(bb_msg_standard_input);
fflush_stdout_and_exit(exit_status);
}