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31#include "libbb.h"
32#include "unicode.h"
33
34
35
36
37#define FLAG_COUNT_BYTES 1
38#define FLAG_BREAK_SPACES 2
39#define FLAG_WIDTH 4
40
41
42
43
44static int adjust_column(unsigned column, char c)
45{
46 if (option_mask32 & FLAG_COUNT_BYTES)
47 return ++column;
48
49 if (c == '\t')
50 return column + 8 - column % 8;
51
52 if (c == '\b') {
53 if ((int)--column < 0)
54 column = 0;
55 }
56 else if (c == '\r')
57 column = 0;
58 else {
59 if (unicode_status != UNICODE_ON
60 || (c & 0xc0) != 0x80
61 ) {
62 column++;
63 }
64 }
65 return column;
66}
67
68
69static void write2stdout(const void *buf, unsigned size)
70{
71 fwrite(buf, 1, size, stdout);
72}
73
74int fold_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
75int fold_main(int argc UNUSED_PARAM, char **argv)
76{
77 char *line_out = NULL;
78 const char *w_opt = "80";
79 unsigned width;
80 smallint exitcode = EXIT_SUCCESS;
81
82 init_unicode();
83
84 if (ENABLE_INCLUDE_SUSv2) {
85
86 int i;
87 for (i = 1; argv[i]; i++) {
88 const char *a = argv[i];
89 if (*a == '-') {
90 a++;
91 if (*a == '-' && !a[1])
92 break;
93 if (isdigit(*a))
94 argv[i] = xasprintf("-w%s", a);
95 }
96 }
97 }
98
99 getopt32(argv, "bsw:", &w_opt);
100 width = xatou_range(w_opt, 1, 10000);
101
102 argv += optind;
103 if (!*argv)
104 *--argv = (char*)"-";
105
106 do {
107 FILE *istream = fopen_or_warn_stdin(*argv);
108 int c;
109 unsigned column = 0;
110 unsigned offset_out = 0;
111
112 if (istream == NULL) {
113 exitcode = EXIT_FAILURE;
114 continue;
115 }
116
117 while ((c = getc(istream)) != EOF) {
118
119 if ((offset_out & 0xfff) == 0) {
120 line_out = xrealloc(line_out, offset_out + 0x1000);
121 }
122 rescan:
123 line_out[offset_out] = c;
124 if (c == '\n') {
125 write2stdout(line_out, offset_out + 1);
126 column = offset_out = 0;
127 continue;
128 }
129 column = adjust_column(column, c);
130 if (column <= width || offset_out == 0) {
131
132
133
134
135 offset_out++;
136 continue;
137 }
138
139
140
141
142 if (option_mask32 & FLAG_BREAK_SPACES) {
143 unsigned i;
144 unsigned logical_end;
145
146
147 for (logical_end = offset_out - 1; (int)logical_end >= 0; logical_end--) {
148 if (!isblank(line_out[logical_end]))
149 continue;
150
151
152
153 logical_end++;
154
155 write2stdout(line_out, logical_end);
156 putchar('\n');
157
158
159 memmove(line_out, line_out + logical_end, offset_out - logical_end);
160 offset_out -= logical_end;
161 for (column = i = 0; i < offset_out; i++) {
162 column = adjust_column(column, line_out[i]);
163 }
164 goto rescan;
165 }
166
167 }
168
169 line_out[offset_out] = '\n';
170 write2stdout(line_out, offset_out + 1);
171 column = offset_out = 0;
172 goto rescan;
173 }
174
175 if (offset_out) {
176 write2stdout(line_out, offset_out);
177 }
178
179 if (fclose_if_not_stdin(istream)) {
180 bb_simple_perror_msg(*argv);
181 exitcode = EXIT_FAILURE;
182 }
183 } while (*++argv);
184
185 fflush_stdout_and_exit(exitcode);
186}
187