| File: | src/usr.bin/tr/str.c |
| Warning: | line 126, column 8 Although the value stored to 'p' is used in the enclosing expression, the value is never actually read from 'p' |
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| 1 | /* $OpenBSD: str.c,v 1.15 2023/05/04 16:08:29 tb Exp $ */ |
| 2 | /* $NetBSD: str.c,v 1.7 1995/08/31 22:13:47 jtc Exp $ */ |
| 3 | |
| 4 | /*- |
| 5 | * Copyright (c) 1991, 1993 |
| 6 | * The Regents of the University of California. All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. Neither the name of the University nor the names of its contributors |
| 17 | * may be used to endorse or promote products derived from this software |
| 18 | * without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 30 | * SUCH DAMAGE. |
| 31 | */ |
| 32 | |
| 33 | #include <sys/types.h> |
| 34 | |
| 35 | #include <assert.h> |
| 36 | #include <errno(*__errno()).h> |
| 37 | #include <stddef.h> |
| 38 | #include <stdio.h> |
| 39 | #include <stdlib.h> |
| 40 | #include <string.h> |
| 41 | #include <ctype.h> |
| 42 | #include <err.h> |
| 43 | |
| 44 | #include "extern.h" |
| 45 | |
| 46 | static int backslash(STR *); |
| 47 | static int bracket(STR *); |
| 48 | static int c_class(const void *, const void *); |
| 49 | static void genclass(STR *); |
| 50 | static void genequiv(STR *); |
| 51 | static int genrange(STR *); |
| 52 | static void genseq(STR *); |
| 53 | |
| 54 | int |
| 55 | next(STR *s) |
| 56 | { |
| 57 | int ch; |
| 58 | |
| 59 | switch (s->state) { |
| 60 | case EOS: |
| 61 | return (0); |
| 62 | case INFINITE: |
| 63 | return (1); |
| 64 | case NORMAL: |
| 65 | switch (ch = *s->str) { |
| 66 | case '\0': |
| 67 | s->state = EOS; |
| 68 | return (0); |
| 69 | case '\\': |
| 70 | s->lastch = backslash(s); |
| 71 | break; |
| 72 | case '[': |
| 73 | if (bracket(s)) |
| 74 | return (next(s)); |
| 75 | /* FALLTHROUGH */ |
| 76 | default: |
| 77 | ++s->str; |
| 78 | s->lastch = ch; |
| 79 | break; |
| 80 | } |
| 81 | |
| 82 | /* We can start a range at any time. */ |
| 83 | if (s->str[0] == '-' && genrange(s)) |
| 84 | return (next(s)); |
| 85 | return (1); |
| 86 | case RANGE: |
| 87 | if (s->cnt-- == 0) { |
| 88 | s->state = NORMAL; |
| 89 | return (next(s)); |
| 90 | } |
| 91 | ++s->lastch; |
| 92 | return (1); |
| 93 | case SEQUENCE: |
| 94 | if (s->cnt-- == 0) { |
| 95 | s->state = NORMAL; |
| 96 | return (next(s)); |
| 97 | } |
| 98 | return (1); |
| 99 | case SET: |
| 100 | if ((s->lastch = s->set[s->cnt++]) == OOBCH(0xff + 1)) { |
| 101 | s->state = NORMAL; |
| 102 | return (next(s)); |
| 103 | } |
| 104 | return (1); |
| 105 | default: |
| 106 | return 0; |
| 107 | } |
| 108 | /* NOTREACHED */ |
| 109 | } |
| 110 | |
| 111 | static int |
| 112 | bracket(STR *s) |
| 113 | { |
| 114 | char *p; |
| 115 | |
| 116 | switch (s->str[1]) { |
| 117 | case ':': /* "[:class:]" */ |
| 118 | if ((p = strstr((char *)s->str + 2, ":]")) == NULL((void *)0)) |
| 119 | return (0); |
| 120 | *p = '\0'; |
| 121 | s->str += 2; |
| 122 | genclass(s); |
| 123 | s->str = (unsigned char *)p + 2; |
| 124 | return (1); |
| 125 | case '=': /* "[=equiv=]" */ |
| 126 | if ((p = strstr((char *)s->str + 2, "=]")) == NULL((void *)0)) |
Although the value stored to 'p' is used in the enclosing expression, the value is never actually read from 'p' | |
| 127 | return (0); |
| 128 | s->str += 2; |
| 129 | genequiv(s); |
| 130 | return (1); |
| 131 | default: /* "[\###*n]" or "[#*n]" */ |
| 132 | if ((p = strpbrk((char *)s->str + 2, "*]")) == NULL((void *)0)) |
| 133 | return (0); |
| 134 | if (p[0] != '*' || strchr(p, ']') == NULL((void *)0)) |
| 135 | return (0); |
| 136 | s->str += 1; |
| 137 | genseq(s); |
| 138 | return (1); |
| 139 | } |
| 140 | /* NOTREACHED */ |
| 141 | } |
| 142 | |
| 143 | typedef struct { |
| 144 | char *name; |
| 145 | int (*func)(int); |
| 146 | int *set; |
| 147 | } CLASS; |
| 148 | |
| 149 | static CLASS classes[] = { |
| 150 | { "alnum", isalnum, }, |
| 151 | { "alpha", isalpha, }, |
| 152 | { "blank", isblank, }, |
| 153 | { "cntrl", iscntrl, }, |
| 154 | { "digit", isdigit, }, |
| 155 | { "graph", isgraph, }, |
| 156 | { "lower", islower, }, |
| 157 | { "print", isprint, }, |
| 158 | { "punct", ispunct, }, |
| 159 | { "space", isspace, }, |
| 160 | { "upper", isupper, }, |
| 161 | { "xdigit", isxdigit, }, |
| 162 | }; |
| 163 | |
| 164 | static void |
| 165 | genclass(STR *s) |
| 166 | { |
| 167 | CLASS *cp, tmp; |
| 168 | size_t len; |
| 169 | int i; |
| 170 | |
| 171 | tmp.name = (char *)s->str; |
| 172 | if ((cp = (CLASS *)bsearch(&tmp, classes, sizeof(classes) / |
| 173 | sizeof(CLASS), sizeof(CLASS), c_class)) == NULL((void *)0)) |
| 174 | errx(1, "unknown class %s", s->str); |
| 175 | |
| 176 | /* |
| 177 | * Generate the set of characters in the class if we haven't |
| 178 | * already done so. |
| 179 | */ |
| 180 | if (cp->set == NULL((void *)0)) { |
| 181 | cp->set = reallocarray(NULL((void *)0), NCHARS(0xff + 1) + 1, sizeof(*cp->set)); |
| 182 | if (cp->set == NULL((void *)0)) |
| 183 | err(1, NULL((void *)0)); |
| 184 | len = 0; |
| 185 | for (i = 0; i < NCHARS(0xff + 1); i++) { |
| 186 | if (cp->func(i)) { |
| 187 | cp->set[len] = i; |
| 188 | len++; |
| 189 | } |
| 190 | } |
| 191 | cp->set[len] = OOBCH(0xff + 1); |
| 192 | len++; |
| 193 | cp->set = reallocarray(cp->set, len, sizeof(*cp->set)); |
| 194 | if (cp->set == NULL((void *)0)) |
| 195 | err(1, NULL((void *)0)); |
| 196 | } |
| 197 | |
| 198 | s->cnt = 0; |
| 199 | s->state = SET; |
| 200 | s->set = cp->set; |
| 201 | } |
| 202 | |
| 203 | static int |
| 204 | c_class(const void *a, const void *b) |
| 205 | { |
| 206 | return (strcmp(((CLASS *)a)->name, ((CLASS *)b)->name)); |
| 207 | } |
| 208 | |
| 209 | /* |
| 210 | * English doesn't have any equivalence classes, so for now |
| 211 | * we just syntax check and grab the character. |
| 212 | */ |
| 213 | static void |
| 214 | genequiv(STR *s) |
| 215 | { |
| 216 | if (*s->str == '\\') { |
| 217 | s->equiv[0] = backslash(s); |
| 218 | if (*s->str != '=') |
| 219 | errx(1, "misplaced equivalence equals sign"); |
| 220 | } else { |
| 221 | s->equiv[0] = s->str[0]; |
| 222 | if (s->str[1] != '=') |
| 223 | errx(1, "misplaced equivalence equals sign"); |
| 224 | } |
| 225 | s->str += 2; |
| 226 | s->cnt = 0; |
| 227 | s->state = SET; |
| 228 | s->set = s->equiv; |
| 229 | } |
| 230 | |
| 231 | static int |
| 232 | genrange(STR *s) |
| 233 | { |
| 234 | int stopval; |
| 235 | unsigned char *savestart; |
| 236 | |
| 237 | savestart = s->str; |
| 238 | stopval = *++s->str == '\\' ? backslash(s) : *s->str++; |
| 239 | if (stopval < (u_char)s->lastch) { |
| 240 | s->str = savestart; |
| 241 | return (0); |
| 242 | } |
| 243 | s->cnt = stopval - s->lastch + 1; |
| 244 | s->state = RANGE; |
| 245 | --s->lastch; |
| 246 | return (1); |
| 247 | } |
| 248 | |
| 249 | static void |
| 250 | genseq(STR *s) |
| 251 | { |
| 252 | char *ep; |
| 253 | |
| 254 | if (s->which == STRING1) |
| 255 | errx(1, "sequences only valid in string2"); |
| 256 | |
| 257 | if (*s->str == '\\') |
| 258 | s->lastch = backslash(s); |
| 259 | else |
| 260 | s->lastch = *s->str++; |
| 261 | if (*s->str != '*') |
| 262 | errx(1, "misplaced sequence asterisk"); |
| 263 | |
| 264 | switch (*++s->str) { |
| 265 | case '\\': |
| 266 | s->cnt = backslash(s); |
| 267 | break; |
| 268 | case ']': |
| 269 | s->cnt = 0; |
| 270 | ++s->str; |
| 271 | break; |
| 272 | default: |
| 273 | if (isdigit(*s->str)) { |
| 274 | s->cnt = strtol((char *)s->str, &ep, 0); |
| 275 | if (*ep == ']') { |
| 276 | s->str = (unsigned char *)ep + 1; |
| 277 | break; |
| 278 | } |
| 279 | } |
| 280 | errx(1, "illegal sequence count"); |
| 281 | /* NOTREACHED */ |
| 282 | } |
| 283 | |
| 284 | s->state = s->cnt ? SEQUENCE : INFINITE; |
| 285 | } |
| 286 | |
| 287 | /* |
| 288 | * Translate \??? into a character. Up to 3 octal digits, if no digits either |
| 289 | * an escape code or a literal character. |
| 290 | */ |
| 291 | static int |
| 292 | backslash(STR *s) |
| 293 | { |
| 294 | size_t i; |
| 295 | int ch, val; |
| 296 | |
| 297 | assert(*s->str == '\\')((*s->str == '\\') ? (void)0 : __assert2("/usr/src/usr.bin/tr/str.c" , 297, __func__, "*s->str == '\\\\'")); |
| 298 | s->str++; |
| 299 | |
| 300 | /* Empty escapes become plain backslashes. */ |
| 301 | if (*s->str == '\0') { |
| 302 | s->state = EOS; |
| 303 | return ('\\'); |
| 304 | } |
| 305 | |
| 306 | val = 0; |
| 307 | for (i = 0; i < 3; i++) { |
| 308 | if (s->str[i] < '0' || '7' < s->str[i]) |
| 309 | break; |
| 310 | val = val * 8 + s->str[i] - '0'; |
| 311 | } |
| 312 | if (i > 0) { |
| 313 | if (val > UCHAR_MAX0xff) |
| 314 | errx(1, "octal value out of range: %d", val); |
| 315 | s->str += i; |
| 316 | return (val); |
| 317 | } |
| 318 | |
| 319 | ch = *s->str++; |
| 320 | switch (ch) { |
| 321 | case 'a': /* escape characters */ |
| 322 | return ('\7'); |
| 323 | case 'b': |
| 324 | return ('\b'); |
| 325 | case 'f': |
| 326 | return ('\f'); |
| 327 | case 'n': |
| 328 | return ('\n'); |
| 329 | case 'r': |
| 330 | return ('\r'); |
| 331 | case 't': |
| 332 | return ('\t'); |
| 333 | case 'v': |
| 334 | return ('\13'); |
| 335 | default: /* \x" -> x */ |
| 336 | return (ch); |
| 337 | } |
| 338 | } |