Changeset 2725 in MondoRescue for branches/2.2.9/mindi-busybox/coreutils/fold.c
- Timestamp:
- Feb 25, 2011, 9:26:54 PM (13 years ago)
- File:
-
- 1 edited
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branches/2.2.9/mindi-busybox/coreutils/fold.c
r1765 r2725 6 6 7 7 Modified for busybox based on coreutils v 5.0 8 Copyright (C) 2003 Glenn McGrath <bug1@iinet.net.au>8 Copyright (C) 2003 Glenn McGrath 9 9 10 Licensed under the GPL v2 or later, see the file LICENSE in this tarball.10 Licensed under GPLv2 or later, see file LICENSE in this source tree. 11 11 */ 12 #include "libbb.h" 13 #include "unicode.h" 12 14 13 #include "libbb.h" 15 /* This is a NOEXEC applet. Be very careful! */ 14 16 15 static unsigned long flags; 16 #define FLAG_COUNT_BYTES 17 #define FLAG_BREAK_SPACES 18 #define FLAG_WIDTH 17 /* Must match getopt32 call */ 18 #define FLAG_COUNT_BYTES 1 19 #define FLAG_BREAK_SPACES 2 20 #define FLAG_WIDTH 4 19 21 20 22 /* Assuming the current column is COLUMN, return the column that 21 23 printing C will move the cursor to. 22 24 The first column is 0. */ 25 static int adjust_column(unsigned column, char c) 26 { 27 if (option_mask32 & FLAG_COUNT_BYTES) 28 return ++column; 23 29 24 static int adjust_column(int column, char c) 25 { 26 if (!(flags & FLAG_COUNT_BYTES)) { 27 if (c == '\b') { 28 if (column > 0) 29 column--; 30 } else if (c == '\r') 30 if (c == '\t') 31 return column + 8 - column % 8; 32 33 if (c == '\b') { 34 if ((int)--column < 0) 31 35 column = 0; 32 else if (c == '\t') 33 column = column + 8 - column % 8; 34 else /* if (isprint (c)) */ 36 } 37 else if (c == '\r') 38 column = 0; 39 else { /* just a printable char */ 40 if (unicode_status != UNICODE_ON /* every byte is a new char */ 41 || (c & 0xc0) != 0x80 /* it isn't a 2nd+ byte of a Unicode char */ 42 ) { 35 43 column++; 36 } else37 column++;44 } 45 } 38 46 return column; 39 47 } 40 48 41 int fold_main(int argc, char **argv); 42 int fold_main(int argc, char **argv) 49 /* Note that this function can write NULs, unlike fputs etc. */ 50 static void write2stdout(const void *buf, unsigned size) 51 { 52 fwrite(buf, 1, size, stdout); 53 } 54 55 int fold_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; 56 int fold_main(int argc UNUSED_PARAM, char **argv) 43 57 { 44 58 char *line_out = NULL; 45 int allocated_out = 0;46 char *w_opt;47 int width = 80;48 int i; 49 in t errs = 0;59 const char *w_opt = "80"; 60 unsigned width; 61 smallint exitcode = EXIT_SUCCESS; 62 63 init_unicode(); 50 64 51 65 if (ENABLE_INCLUDE_SUSv2) { 52 66 /* Turn any numeric options into -w options. */ 53 for (i = 1; i < argc; i++) { 54 char const *a = argv[i]; 55 56 if (*a++ == '-') { 57 if (*a == '-' && !a[1]) 67 int i; 68 for (i = 1; argv[i]; i++) { 69 const char *a = argv[i]; 70 if (*a == '-') { 71 a++; 72 if (*a == '-' && !a[1]) /* "--" */ 58 73 break; 59 if (isdigit(*a)) {74 if (isdigit(*a)) 60 75 argv[i] = xasprintf("-w%s", a); 61 }62 76 } 63 77 } 64 78 } 65 79 66 flags = getopt32(argv, "bsw:", &w_opt); 67 if (flags & FLAG_WIDTH) 68 width = xatoul_range(w_opt, 1, 10000); 80 getopt32(argv, "bsw:", &w_opt); 81 width = xatou_range(w_opt, 1, 10000); 69 82 70 83 argv += optind; 71 if (!*argv) {84 if (!*argv) 72 85 *--argv = (char*)"-"; 73 }74 86 75 87 do { 76 88 FILE *istream = fopen_or_warn_stdin(*argv); 77 89 int c; 78 int column = 0; /* Screen column where next char will go.*/79 int offset_out = 0; /* Index in `line_out' for next char.*/90 unsigned column = 0; /* Screen column where next char will go */ 91 unsigned offset_out = 0; /* Index in 'line_out' for next char */ 80 92 81 93 if (istream == NULL) { 82 e rrs |= EXIT_FAILURE;94 exitcode = EXIT_FAILURE; 83 95 continue; 84 96 } 85 97 86 98 while ((c = getc(istream)) != EOF) { 87 if (offset_out + 1 >= allocated_out) {88 allocated_out += 1024;89 line_out = xrealloc(line_out, allocated_out);99 /* We grow line_out in chunks of 0x1000 bytes */ 100 if ((offset_out & 0xfff) == 0) { 101 line_out = xrealloc(line_out, offset_out + 0x1000); 90 102 } 91 103 rescan: 104 line_out[offset_out] = c; 92 105 if (c == '\n') { 93 line_out[offset_out++] = c; 94 fwrite(line_out, sizeof(char), (size_t) offset_out, stdout); 106 write2stdout(line_out, offset_out + 1); 95 107 column = offset_out = 0; 96 108 continue; 97 109 } 98 rescan:99 110 column = adjust_column(column, c); 100 101 if (column > width) { 102 /* This character would make the line too long. 103 Print the line plus a newline, and make this character 104 start the next line. */ 105 if (flags & FLAG_BREAK_SPACES) { 106 /* Look for the last blank. */ 107 int logical_end; 108 109 for (logical_end = offset_out - 1; logical_end >= 0; logical_end--) { 110 if (isblank(line_out[logical_end])) { 111 break; 112 } 113 } 114 if (logical_end >= 0) { 115 /* Found a blank. Don't output the part after it. */ 116 logical_end++; 117 fwrite(line_out, sizeof(char), (size_t) logical_end, stdout); 118 putchar('\n'); 119 /* Move the remainder to the beginning of the next line. 120 The areas being copied here might overlap. */ 121 memmove(line_out, line_out + logical_end, offset_out - logical_end); 122 offset_out -= logical_end; 123 for (column = i = 0; i < offset_out; i++) { 124 column = adjust_column(column, line_out[i]); 125 } 126 goto rescan; 127 } 128 } else { 129 if (offset_out == 0) { 130 line_out[offset_out++] = c; 131 continue; 132 } 133 } 134 line_out[offset_out++] = '\n'; 135 fwrite(line_out, sizeof(char), (size_t) offset_out, stdout); 136 column = offset_out = 0; 137 goto rescan; 111 if (column <= width || offset_out == 0) { 112 /* offset_out == 0 case happens 113 * with small width (say, 1) and tabs. 114 * The very first tab already goes to column 8, 115 * but we must not wrap it */ 116 offset_out++; 117 continue; 138 118 } 139 119 140 line_out[offset_out++] = c; 120 /* This character would make the line too long. 121 * Print the line plus a newline, and make this character 122 * start the next line */ 123 if (option_mask32 & FLAG_BREAK_SPACES) { 124 unsigned i; 125 unsigned logical_end; 126 127 /* Look for the last blank. */ 128 for (logical_end = offset_out - 1; (int)logical_end >= 0; logical_end--) { 129 if (!isblank(line_out[logical_end])) 130 continue; 131 132 /* Found a space or tab. 133 * Output up to and including it, and start a new line */ 134 logical_end++; 135 /*line_out[logical_end] = '\n'; - NO! this nukes one buffered character */ 136 write2stdout(line_out, logical_end); 137 putchar('\n'); 138 /* Move the remainder to the beginning of the next line. 139 * The areas being copied here might overlap. */ 140 memmove(line_out, line_out + logical_end, offset_out - logical_end); 141 offset_out -= logical_end; 142 for (column = i = 0; i < offset_out; i++) { 143 column = adjust_column(column, line_out[i]); 144 } 145 goto rescan; 146 } 147 /* No blank found, wrap will split the overlong word */ 148 } 149 /* Output what we accumulated up to now, and start a new line */ 150 line_out[offset_out] = '\n'; 151 write2stdout(line_out, offset_out + 1); 152 column = offset_out = 0; 153 goto rescan; 154 } /* while (not EOF) */ 155 156 if (offset_out) { 157 write2stdout(line_out, offset_out); 141 158 } 142 159 143 if (offset_out) { 144 fwrite(line_out, sizeof(char), (size_t) offset_out, stdout); 145 } 146 147 if (ferror(istream) || fclose_if_not_stdin(istream)) { 148 bb_perror_msg("%s", *argv); /* Avoid multibyte problems. */ 149 errs |= EXIT_FAILURE; 160 if (fclose_if_not_stdin(istream)) { 161 bb_simple_perror_msg(*argv); 162 exitcode = EXIT_FAILURE; 150 163 } 151 164 } while (*++argv); 152 165 153 fflush_stdout_and_exit(e rrs);166 fflush_stdout_and_exit(exitcode); 154 167 }
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