Diff of /trunk/mkinitrd-magellan/busybox/coreutils/fold.c

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	revision 532 by niro, Sat Sep 1 22:45:15 2007 UTC	revision 984 by niro, Sun May 30 11:32:42 2010 UTC
#	Line 5	Line 5
5	Copyright (C) 91, 1995-2002 Free Software Foundation, Inc.	Copyright (C) 91, 1995-2002 Free Software Foundation, Inc.
6
7	Modified for busybox based on coreutils v 5.0	Modified for busybox based on coreutils v 5.0
8	Copyright (C) 2003 Glenn McGrath <bug1@iinet.net.au>	Copyright (C) 2003 Glenn McGrath
9
10	Licensed under the GPL v2 or later, see the file LICENSE in this tarball.	Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
11	*/	*/
12		#include "libbb.h"
13		#include "unicode.h"
14
15	#include "busybox.h"	/* Must match getopt32 call */
16		#define FLAG_COUNT_BYTES        1
17	static unsigned long flags;	#define FLAG_BREAK_SPACES       2
18	#define FLAG_COUNT_BYTES 1	#define FLAG_WIDTH              4
	#define FLAG_BREAK_SPACES 2
	#define FLAG_WIDTH 4
19
20	/* Assuming the current column is COLUMN, return the column that	/* Assuming the current column is COLUMN, return the column that
21	printing C will move the cursor to.	printing C will move the cursor to.
22	The first column is 0. */	The first column is 0. */
23		static int adjust_column(unsigned column, char c)
	static int adjust_column(int column, char c)
24	{	{
25	if (!(flags & FLAG_COUNT_BYTES)) {	if (option_mask32 & FLAG_COUNT_BYTES)
26	if (c == '\b') {	return ++column;
27	if (column > 0)
28	column--;	if (c == '\t')
29	} else if (c == '\r')	return column + 8 - column % 8;
30
31		if (c == '\b') {
32		if ((int)--column < 0)
33	column = 0;	column = 0;
34	else if (c == '\t')	}
35	column = column + 8 - column % 8;	else if (c == '\r')
36	else /* if (isprint (c)) */	column = 0;
37		else { /* just a printable char */
38		if (unicode_status != UNICODE_ON /* every byte is a new char */
39		|| (c & 0xc0) != 0x80 /* it isn't a 2nd+ byte of a Unicode char */
40		) {
41	column++;	column++;
42	} else	}
43	column++;	}
44	return column;	return column;
45	}	}
46
47	int fold_main(int argc, char **argv)	/* Note that this function can write NULs, unlike fputs etc. */
48		static void write2stdout(const void *buf, unsigned size)
49		{
50		fwrite(buf, 1, size, stdout);
51		}
52
53		int fold_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
54		int fold_main(int argc UNUSED_PARAM, char **argv)
55	{	{
56	char *w_opt;	char *line_out = NULL;
57	int width = 80;	const char *w_opt = "80";
58	int i;	unsigned width;
59	int errs = 0;	smallint exitcode = EXIT_SUCCESS;
60
61		init_unicode();
62
63	if (ENABLE_INCLUDE_SUSv2) {	if (ENABLE_INCLUDE_SUSv2) {
64	/* Turn any numeric options into -w options.  */	/* Turn any numeric options into -w options.  */
65	for (i = 1; i < argc; i++) {	int i;
66	char const *a = argv[i];	for (i = 1; argv[i]; i++) {
67		const char *a = argv[i];
68	if (*a++ == '-') {	if (*a == '-') {
69	if (*a == '-' && !a[1])	a++;
70		if (*a == '-' && !a[1]) /* "--" */
71	break;	break;
72	if (isdigit(*a)) {	if (isdigit(*a))
73	argv[i] = xasprintf("-w%s", a);	argv[i] = xasprintf("-w%s", a);
	}
74	}	}
75	}	}
76	}	}
77
78	flags = getopt32(argc, argv, "bsw:", &w_opt);	getopt32(argv, "bsw:", &w_opt);
79	if (flags & FLAG_WIDTH)	width = xatou_range(w_opt, 1, 10000);
	width = xatoul_range(w_opt, 1, 10000);
80
81	argv += optind;	argv += optind;
82	if (!*argv) {	if (!*argv)
83	*--argv = "-";	*--argv = (char*)"-";
	}
84
85	do {	do {
86	FILE *istream = fopen_or_warn_stdin(*argv);	FILE *istream = fopen_or_warn_stdin(*argv);
87	int c;	int c;
88	int column = 0; /* Screen column where next char will go. */	unsigned column = 0;     /* Screen column where next char will go */
89	int offset_out = 0; /* Index in `line_out' for next char. */	unsigned offset_out = 0; /* Index in 'line_out' for next char */
	static char *line_out = NULL;
	static int allocated_out = 0;
90
91	if (istream == NULL) {	if (istream == NULL) {
92	errs |= EXIT_FAILURE;	exitcode = EXIT_FAILURE;
93	continue;	continue;
94	}	}
95
96	while ((c = getc(istream)) != EOF) {	while ((c = getc(istream)) != EOF) {
97	if (offset_out + 1 >= allocated_out) {	/* We grow line_out in chunks of 0x1000 bytes */
98	allocated_out += 1024;	if ((offset_out & 0xfff) == 0) {
99	line_out = xrealloc(line_out, allocated_out);	line_out = xrealloc(line_out, offset_out + 0x1000);
100	}	}
101		rescan:
102		line_out[offset_out] = c;
103	if (c == '\n') {	if (c == '\n') {
104	line_out[offset_out++] = c;	write2stdout(line_out, offset_out + 1);
	fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
105	column = offset_out = 0;	column = offset_out = 0;
106	continue;	continue;
107	}	}
	rescan:
108	column = adjust_column(column, c);	column = adjust_column(column, c);
109		if (column <= width || offset_out == 0) {
110		/* offset_out == 0 case happens
111		* with small width (say, 1) and tabs.
112		* The very first tab already goes to column 8,
113		* but we must not wrap it */
114		offset_out++;
115		continue;
116		}
117
118	if (column > width) {	/* This character would make the line too long.
119	/* This character would make the line too long.	* Print the line plus a newline, and make this character
120	Print the line plus a newline, and make this character	* start the next line */
121	start the next line. */	if (option_mask32 & FLAG_BREAK_SPACES) {
122	if (flags & FLAG_BREAK_SPACES) {	unsigned i;
123	/* Look for the last blank. */	unsigned logical_end;
124	int logical_end;
125		/* Look for the last blank. */
126	for (logical_end = offset_out - 1; logical_end >= 0; logical_end--) {	for (logical_end = offset_out - 1; (int)logical_end >= 0; logical_end--) {
127	if (isblank(line_out[logical_end])) {	if (!isblank(line_out[logical_end]))
	break;
	}
	}
	if (logical_end >= 0) {
	/* Found a blank.  Don't output the part after it. */
	logical_end++;
	fwrite(line_out, sizeof(char), (size_t) logical_end, stdout);
	putchar('\n');
	/* Move the remainder to the beginning of the next line.
	The areas being copied here might overlap. */
	memmove(line_out, line_out + logical_end, offset_out - logical_end);
	offset_out -= logical_end;
	for (column = i = 0; i < offset_out; i++) {
	column = adjust_column(column, line_out[i]);
	}
	goto rescan;
	}
	} else {
	if (offset_out == 0) {
	line_out[offset_out++] = c;
128	continue;	continue;
129
130		/* Found a space or tab.
131		* Output up to and including it, and start a new line */
132		logical_end++;
133		/*line_out[logical_end] = '\n'; - NO! this nukes one buffered character */
134		write2stdout(line_out, logical_end);
135		putchar('\n');
136		/* Move the remainder to the beginning of the next line.
137		* The areas being copied here might overlap. */
138		memmove(line_out, line_out + logical_end, offset_out - logical_end);
139		offset_out -= logical_end;
140		for (column = i = 0; i < offset_out; i++) {
141		column = adjust_column(column, line_out[i]);
142	}	}
143		goto rescan;
144	}	}
145	line_out[offset_out++] = '\n';	/* No blank found, wrap will split the overlong word */
	fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);
	column = offset_out = 0;
	goto rescan;
146	}	}
147		/* Output what we accumulated up to now, and start a new line */
148	line_out[offset_out++] = c;	line_out[offset_out] = '\n';
149	}	write2stdout(line_out, offset_out + 1);
150		column = offset_out = 0;
151		goto rescan;
152		} /* while (not EOF) */
153
154	if (offset_out) {	if (offset_out) {
155	fwrite(line_out, sizeof(char), (size_t) offset_out, stdout);	write2stdout(line_out, offset_out);
156	}	}
157
158	if (ferror(istream) || fclose_if_not_stdin(istream)) {	if (fclose_if_not_stdin(istream)) {
159	bb_perror_msg("%s", *argv); /* Avoid multibyte problems. */	bb_simple_perror_msg(*argv);
160	errs |= EXIT_FAILURE;	exitcode = EXIT_FAILURE;
161	}	}
162	} while (*++argv);	} while (*++argv);
163
164	fflush_stdout_and_exit(errs);	fflush_stdout_and_exit(exitcode);
165	}	}

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Legend: Removed from v.532   changed lines   Added in v.984