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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. |
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*/ |
*/ |
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#include "libbb.h" |
#include "libbb.h" |
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#include "unicode.h" |
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/* Must match getopt32 call */ |
/* Must match getopt32 call */ |
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#define FLAG_COUNT_BYTES 1 |
#define FLAG_COUNT_BYTES 1 |
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/* Assuming the current column is COLUMN, return the column that |
/* Assuming the current column is COLUMN, return the column that |
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printing C will move the cursor to. |
printing C will move the cursor to. |
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The first column is 0. */ |
The first column is 0. */ |
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static int adjust_column(int column, char c) |
static int adjust_column(unsigned column, char c) |
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{ |
{ |
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if (!(option_mask32 & FLAG_COUNT_BYTES)) { |
if (option_mask32 & FLAG_COUNT_BYTES) |
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if (c == '\b') { |
return ++column; |
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if (column > 0) |
|
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column--; |
if (c == '\t') |
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} else if (c == '\r') |
return column + 8 - column % 8; |
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if (c == '\b') { |
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if ((int)--column < 0) |
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column = 0; |
column = 0; |
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else if (c == '\t') |
} |
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column = column + 8 - column % 8; |
else if (c == '\r') |
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else /* if (isprint (c)) */ |
column = 0; |
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else { /* just a printable char */ |
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if (unicode_status != UNICODE_ON /* every byte is a new char */ |
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|| (c & 0xc0) != 0x80 /* it isn't a 2nd+ byte of a Unicode char */ |
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) { |
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column++; |
column++; |
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} else |
} |
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column++; |
} |
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return column; |
return column; |
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} |
} |
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/* Note that this function can write NULs, unlike fputs etc. */ |
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static void write2stdout(const void *buf, unsigned size) |
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{ |
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fwrite(buf, 1, size, stdout); |
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} |
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int fold_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
int fold_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
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int fold_main(int argc, char **argv) |
int fold_main(int argc UNUSED_PARAM, char **argv) |
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{ |
{ |
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char *line_out = NULL; |
char *line_out = NULL; |
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int allocated_out = 0; |
const char *w_opt = "80"; |
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char *w_opt; |
unsigned width; |
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int width = 80; |
smallint exitcode = EXIT_SUCCESS; |
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int i; |
|
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int errs = 0; |
init_unicode(); |
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if (ENABLE_INCLUDE_SUSv2) { |
if (ENABLE_INCLUDE_SUSv2) { |
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/* Turn any numeric options into -w options. */ |
/* Turn any numeric options into -w options. */ |
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for (i = 1; i < argc; i++) { |
int i; |
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char const *a = argv[i]; |
for (i = 1; argv[i]; i++) { |
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const char *a = argv[i]; |
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if (*a++ == '-') { |
if (*a == '-') { |
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a++; |
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if (*a == '-' && !a[1]) /* "--" */ |
if (*a == '-' && !a[1]) /* "--" */ |
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break; |
break; |
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if (isdigit(*a)) |
if (isdigit(*a)) |
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} |
} |
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|
|
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getopt32(argv, "bsw:", &w_opt); |
getopt32(argv, "bsw:", &w_opt); |
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if (option_mask32 & FLAG_WIDTH) |
width = xatou_range(w_opt, 1, 10000); |
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width = xatoul_range(w_opt, 1, 10000); |
|
80 |
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|
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argv += optind; |
argv += optind; |
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if (!*argv) |
if (!*argv) |
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do { |
do { |
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FILE *istream = fopen_or_warn_stdin(*argv); |
FILE *istream = fopen_or_warn_stdin(*argv); |
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int c; |
int c; |
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int column = 0; /* Screen column where next char will go. */ |
unsigned column = 0; /* Screen column where next char will go */ |
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int offset_out = 0; /* Index in 'line_out' for next char. */ |
unsigned offset_out = 0; /* Index in 'line_out' for next char */ |
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|
|
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if (istream == NULL) { |
if (istream == NULL) { |
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errs |= EXIT_FAILURE; |
exitcode = EXIT_FAILURE; |
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continue; |
continue; |
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} |
} |
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|
|
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while ((c = getc(istream)) != EOF) { |
while ((c = getc(istream)) != EOF) { |
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if (offset_out + 1 >= allocated_out) { |
/* We grow line_out in chunks of 0x1000 bytes */ |
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allocated_out += 1024; |
if ((offset_out & 0xfff) == 0) { |
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line_out = xrealloc(line_out, allocated_out); |
line_out = xrealloc(line_out, offset_out + 0x1000); |
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} |
} |
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rescan: |
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line_out[offset_out] = c; |
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if (c == '\n') { |
if (c == '\n') { |
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line_out[offset_out++] = c; |
write2stdout(line_out, offset_out + 1); |
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fwrite(line_out, sizeof(char), (size_t) offset_out, stdout); |
|
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column = offset_out = 0; |
column = offset_out = 0; |
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continue; |
continue; |
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} |
} |
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rescan: |
|
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column = adjust_column(column, c); |
column = adjust_column(column, c); |
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if (column <= width || offset_out == 0) { |
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/* offset_out == 0 case happens |
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* with small width (say, 1) and tabs. |
112 |
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* The very first tab already goes to column 8, |
113 |
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* but we must not wrap it */ |
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offset_out++; |
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continue; |
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} |
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|
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if (column > width) { |
/* This character would make the line too long. |
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/* This character would make the line too long. |
* Print the line plus a newline, and make this character |
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Print the line plus a newline, and make this character |
* start the next line */ |
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start the next line. */ |
if (option_mask32 & FLAG_BREAK_SPACES) { |
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if (option_mask32 & FLAG_BREAK_SPACES) { |
unsigned i; |
123 |
/* Look for the last blank. */ |
unsigned logical_end; |
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int logical_end; |
|
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/* Look for the last blank. */ |
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for (logical_end = offset_out - 1; logical_end >= 0; logical_end--) { |
for (logical_end = offset_out - 1; (int)logical_end >= 0; logical_end--) { |
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if (isblank(line_out[logical_end])) { |
if (!isblank(line_out[logical_end])) |
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break; |
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} |
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} |
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if (logical_end >= 0) { |
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/* Found a blank. Don't output the part after it. */ |
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logical_end++; |
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fwrite(line_out, sizeof(char), (size_t) logical_end, stdout); |
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bb_putchar('\n'); |
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/* Move the remainder to the beginning of the next line. |
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The areas being copied here might overlap. */ |
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memmove(line_out, line_out + logical_end, offset_out - logical_end); |
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offset_out -= logical_end; |
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for (column = i = 0; i < offset_out; i++) { |
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column = adjust_column(column, line_out[i]); |
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} |
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goto rescan; |
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} |
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} else { |
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if (offset_out == 0) { |
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line_out[offset_out++] = c; |
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continue; |
continue; |
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130 |
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/* Found a space or tab. |
131 |
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* Output up to and including it, and start a new line */ |
132 |
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logical_end++; |
133 |
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/*line_out[logical_end] = '\n'; - NO! this nukes one buffered character */ |
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write2stdout(line_out, logical_end); |
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putchar('\n'); |
136 |
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/* Move the remainder to the beginning of the next line. |
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* The areas being copied here might overlap. */ |
138 |
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memmove(line_out, line_out + logical_end, offset_out - logical_end); |
139 |
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offset_out -= logical_end; |
140 |
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for (column = i = 0; i < offset_out; i++) { |
141 |
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column = adjust_column(column, line_out[i]); |
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} |
} |
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goto rescan; |
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} |
} |
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); |
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column = offset_out = 0; |
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goto rescan; |
|
146 |
} |
} |
147 |
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/* Output what we accumulated up to now, and start a new line */ |
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line_out[offset_out++] = c; |
line_out[offset_out] = '\n'; |
149 |
} |
write2stdout(line_out, offset_out + 1); |
150 |
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column = offset_out = 0; |
151 |
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goto rescan; |
152 |
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} /* while (not EOF) */ |
153 |
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|
154 |
if (offset_out) { |
if (offset_out) { |
155 |
fwrite(line_out, sizeof(char), (size_t) offset_out, stdout); |
write2stdout(line_out, offset_out); |
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} |
} |
157 |
|
|
158 |
if (fclose_if_not_stdin(istream)) { |
if (fclose_if_not_stdin(istream)) { |
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bb_simple_perror_msg(*argv); /* Avoid multibyte problems. */ |
bb_simple_perror_msg(*argv); |
160 |
errs |= EXIT_FAILURE; |
exitcode = EXIT_FAILURE; |
161 |
} |
} |
162 |
} while (*++argv); |
} while (*++argv); |
163 |
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|
164 |
fflush_stdout_and_exit(errs); |
fflush_stdout_and_exit(exitcode); |
165 |
} |
} |