| File: | src/usr.bin/fold/fold.c |
| Warning: | line 105, column 2 Value stored to 'argc' is never read |
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| 1 | /* $OpenBSD: fold.c,v 1.18 2016/05/23 10:31:42 schwarze Exp $ */ |
| 2 | /* $NetBSD: fold.c,v 1.6 1995/09/01 01:42:44 jtc Exp $ */ |
| 3 | |
| 4 | /*- |
| 5 | * Copyright (c) 1990, 1993 |
| 6 | * The Regents of the University of California. All rights reserved. |
| 7 | * |
| 8 | * This code is derived from software contributed to Berkeley by |
| 9 | * Kevin Ruddy. |
| 10 | * |
| 11 | * Redistribution and use in source and binary forms, with or without |
| 12 | * modification, are permitted provided that the following conditions |
| 13 | * are met: |
| 14 | * 1. Redistributions of source code must retain the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer. |
| 16 | * 2. Redistributions in binary form must reproduce the above copyright |
| 17 | * notice, this list of conditions and the following disclaimer in the |
| 18 | * documentation and/or other materials provided with the distribution. |
| 19 | * 3. Neither the name of the University nor the names of its contributors |
| 20 | * may be used to endorse or promote products derived from this software |
| 21 | * without specific prior written permission. |
| 22 | * |
| 23 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 33 | * SUCH DAMAGE. |
| 34 | */ |
| 35 | |
| 36 | #include <ctype.h> |
| 37 | #include <err.h> |
| 38 | #include <limits.h> |
| 39 | #include <locale.h> |
| 40 | #include <stdio.h> |
| 41 | #include <stdlib.h> |
| 42 | #include <string.h> |
| 43 | #include <unistd.h> |
| 44 | #include <wchar.h> |
| 45 | |
| 46 | #define DEFLINEWIDTH80 80 |
| 47 | |
| 48 | static void fold(unsigned int); |
| 49 | static int isu8cont(unsigned char); |
| 50 | static __dead__attribute__((__noreturn__)) void usage(void); |
| 51 | |
| 52 | int count_bytes = 0; |
| 53 | int split_words = 0; |
| 54 | |
| 55 | int |
| 56 | main(int argc, char *argv[]) |
| 57 | { |
| 58 | int ch, lastch, newarg, prevoptind; |
| 59 | unsigned int width; |
| 60 | const char *errstr; |
| 61 | |
| 62 | setlocale(LC_CTYPE2, ""); |
| 63 | |
| 64 | if (pledge("stdio rpath", NULL((void *)0)) == -1) |
| 65 | err(1, "pledge"); |
| 66 | |
| 67 | width = 0; |
| 68 | lastch = '\0'; |
| 69 | prevoptind = 1; |
| 70 | newarg = 1; |
| 71 | while ((ch = getopt(argc, argv, "0123456789bsw:")) != -1) { |
| 72 | switch (ch) { |
| 73 | case 'b': |
| 74 | count_bytes = 1; |
| 75 | break; |
| 76 | case 's': |
| 77 | split_words = 1; |
| 78 | break; |
| 79 | case 'w': |
| 80 | width = strtonum(optarg, 1, UINT_MAX(2147483647 *2U +1U), &errstr); |
| 81 | if (errstr != NULL((void *)0)) |
| 82 | errx(1, "illegal width value, %s: %s", errstr, |
| 83 | optarg); |
| 84 | break; |
| 85 | case '0': case '1': case '2': case '3': case '4': |
| 86 | case '5': case '6': case '7': case '8': case '9': |
| 87 | if (newarg) |
| 88 | width = 0; |
| 89 | else if (!isdigit(lastch)) |
| 90 | usage(); |
| 91 | if (width > UINT_MAX(2147483647 *2U +1U) / 10 - 1) |
| 92 | errx(1, "illegal width value, too large"); |
| 93 | width = (width * 10) + (ch - '0'); |
| 94 | if (width < 1) |
| 95 | errx(1, "illegal width value, too small"); |
| 96 | break; |
| 97 | default: |
| 98 | usage(); |
| 99 | } |
| 100 | lastch = ch; |
| 101 | newarg = optind != prevoptind; |
| 102 | prevoptind = optind; |
| 103 | } |
| 104 | argv += optind; |
| 105 | argc -= optind; |
Value stored to 'argc' is never read | |
| 106 | |
| 107 | if (width == 0) |
| 108 | width = DEFLINEWIDTH80; |
| 109 | |
| 110 | if (!*argv) { |
| 111 | if (pledge("stdio", NULL((void *)0)) == -1) |
| 112 | err(1, "pledge"); |
| 113 | fold(width); |
| 114 | } else { |
| 115 | for (; *argv; ++argv) { |
| 116 | if (!freopen(*argv, "r", stdin(&__sF[0]))) |
| 117 | err(1, "%s", *argv); |
| 118 | else |
| 119 | fold(width); |
| 120 | } |
| 121 | } |
| 122 | return 0; |
| 123 | } |
| 124 | |
| 125 | /* |
| 126 | * Fold the contents of standard input to fit within WIDTH columns |
| 127 | * (or bytes) and write to standard output. |
| 128 | * |
| 129 | * If split_words is set, split the line at the last space character |
| 130 | * on the line. This flag necessitates storing the line in a buffer |
| 131 | * until the current column > width, or a newline or EOF is read. |
| 132 | * |
| 133 | * The buffer can grow larger than WIDTH due to backspaces and carriage |
| 134 | * returns embedded in the input stream. |
| 135 | */ |
| 136 | static void |
| 137 | fold(unsigned int max_width) |
| 138 | { |
| 139 | static char *buf = NULL((void *)0); |
| 140 | static size_t bufsz = 2048; |
| 141 | char *cp; /* Current mb character. */ |
| 142 | char *np; /* Next mb character. */ |
| 143 | char *sp; /* To search for the last space. */ |
| 144 | char *nbuf; /* For buffer reallocation. */ |
| 145 | wchar_t wc; /* Current wide character. */ |
| 146 | int ch; /* Last byte read. */ |
| 147 | int len; /* Bytes in the current mb character. */ |
| 148 | unsigned int col; /* Current display position. */ |
| 149 | int width; /* Display width of wc. */ |
| 150 | |
| 151 | if (buf == NULL((void *)0) && (buf = malloc(bufsz)) == NULL((void *)0)) |
| 152 | err(1, NULL((void *)0)); |
| 153 | |
| 154 | np = cp = buf; |
| 155 | ch = 0; |
| 156 | col = 0; |
| 157 | |
| 158 | while (ch != EOF(-1)) { /* Loop on input characters. */ |
| 159 | while ((ch = getchar()(!__isthreaded ? (--((&__sF[0]))->_r < 0 ? __srget( (&__sF[0])) : (int)(*((&__sF[0]))->_p++)) : (getc) ((&__sF[0])))) != EOF(-1)) { /* Loop on input bytes. */ |
| 160 | if (np + 1 == buf + bufsz) { |
| 161 | nbuf = reallocarray(buf, 2, bufsz); |
| 162 | if (nbuf == NULL((void *)0)) |
| 163 | err(1, NULL((void *)0)); |
| 164 | bufsz *= 2; |
| 165 | cp = nbuf + (cp - buf); |
| 166 | np = nbuf + (np - buf); |
| 167 | buf = nbuf; |
| 168 | } |
| 169 | *np++ = ch; |
| 170 | |
| 171 | /* |
| 172 | * Read up to and including the first byte of |
| 173 | * the next character, such that we are sure |
| 174 | * to have a complete character in the buffer. |
| 175 | * There is no need to read more than five bytes |
| 176 | * ahead, since UTF-8 characters are four bytes |
| 177 | * long at most. |
| 178 | */ |
| 179 | |
| 180 | if (np - cp > 4 || (np - cp > 1 && !isu8cont(ch))) |
| 181 | break; |
| 182 | } |
| 183 | |
| 184 | while (cp < np) { /* Loop on output characters. */ |
| 185 | |
| 186 | /* Handle end of line and backspace. */ |
| 187 | |
| 188 | if (*cp == '\n' || (*cp == '\r' && !count_bytes)) { |
| 189 | fwrite(buf, 1, ++cp - buf, stdout(&__sF[1])); |
| 190 | memmove(buf, cp, np - cp); |
| 191 | np = buf + (np - cp); |
| 192 | cp = buf; |
| 193 | col = 0; |
| 194 | continue; |
| 195 | } |
| 196 | if (*cp == '\b' && !count_bytes) { |
| 197 | if (col) |
| 198 | col--; |
| 199 | cp++; |
| 200 | continue; |
| 201 | } |
| 202 | |
| 203 | /* |
| 204 | * Measure display width. |
| 205 | * Process the last byte only if |
| 206 | * end of file was reached. |
| 207 | */ |
| 208 | |
| 209 | if (np - cp > (ch != EOF(-1))) { |
| 210 | len = 1; |
| 211 | width = 1; |
| 212 | |
| 213 | if (*cp == '\t') { |
| 214 | if (count_bytes == 0) |
| 215 | width = 8 - (col & 7); |
| 216 | } else if ((len = mbtowc(&wc, cp, |
| 217 | np - cp)) < 1) |
| 218 | len = 1; |
| 219 | else if (count_bytes) |
| 220 | width = len; |
| 221 | else if ((width = wcwidth(wc)) < 0) |
| 222 | width = 1; |
| 223 | |
| 224 | col += width; |
| 225 | if (col <= max_width || cp == buf) { |
| 226 | cp += len; |
| 227 | continue; |
| 228 | } |
| 229 | } |
| 230 | |
| 231 | /* Line break required. */ |
| 232 | |
| 233 | if (col > max_width) { |
| 234 | if (split_words) { |
| 235 | for (sp = cp; sp > buf; sp--) { |
| 236 | if (sp[-1] == ' ') { |
| 237 | cp = sp; |
| 238 | break; |
| 239 | } |
| 240 | } |
| 241 | } |
| 242 | fwrite(buf, 1, cp - buf, stdout(&__sF[1])); |
| 243 | putchar('\n')(!__isthreaded ? __sputc('\n', (&__sF[1])) : (putc)('\n', (&__sF[1]))); |
| 244 | memmove(buf, cp, np - cp); |
| 245 | np = buf + (np - cp); |
| 246 | cp = buf; |
| 247 | col = 0; |
| 248 | continue; |
| 249 | } |
| 250 | |
| 251 | /* Need more input. */ |
| 252 | |
| 253 | break; |
| 254 | } |
| 255 | } |
| 256 | fwrite(buf, 1, np - buf, stdout(&__sF[1])); |
| 257 | |
| 258 | if (ferror(stdin)(!__isthreaded ? ((((&__sF[0]))->_flags & 0x0040) != 0) : (ferror)((&__sF[0])))) |
| 259 | err(1, NULL((void *)0)); |
| 260 | } |
| 261 | |
| 262 | static int |
| 263 | isu8cont(unsigned char c) |
| 264 | { |
| 265 | return MB_CUR_MAX__mb_cur_max() > 1 && (c & (0x80 | 0x40)) == 0x80; |
| 266 | } |
| 267 | |
| 268 | static __dead__attribute__((__noreturn__)) void |
| 269 | usage(void) |
| 270 | { |
| 271 | (void)fprintf(stderr(&__sF[2]), "usage: fold [-bs] [-w width] [file ...]\n"); |
| 272 | exit(1); |
| 273 | } |