[337] | 1 | #include <wordexp.h>
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| 2 | #include <unistd.h>
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| 3 | #include <stdio.h>
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| 4 | #include <string.h>
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| 5 | #include <limits.h>
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| 6 | #include <stdint.h>
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| 7 | #include <stdlib.h>
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| 8 | #include <sys/wait.h>
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| 9 | #include <signal.h>
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| 10 | #include <errno.h>
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| 11 | #include <fcntl.h>
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| 12 | #include "pthread_impl.h"
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| 13 |
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| 14 | static void reap(pid_t pid)
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| 15 | {
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| 16 | int status;
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| 17 | for (;;) {
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| 18 | if (waitpid(pid, &status, 0) < 0) {
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| 19 | if (errno != EINTR) return;
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| 20 | } else {
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| 21 | if (WIFEXITED(status)) return;
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| 22 | }
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| 23 | }
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| 24 | }
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| 25 |
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| 26 | static char *getword(FILE *f)
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| 27 | {
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| 28 | char *s = 0;
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| 29 | return getdelim(&s, (size_t [1]){0}, 0, f) < 0 ? 0 : s;
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| 30 | }
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| 31 |
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| 32 | static int do_wordexp(const char *s, wordexp_t *we, int flags)
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| 33 | {
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| 34 | size_t i, l;
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| 35 | int sq=0, dq=0;
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| 36 | size_t np=0;
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| 37 | char *w, **tmp;
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| 38 | char *redir = (flags & WRDE_SHOWERR) ? "" : "2>/dev/null";
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| 39 | int err = 0;
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| 40 | FILE *f;
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| 41 | size_t wc = 0;
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| 42 | char **wv = 0;
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| 43 | int p[2];
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| 44 | pid_t pid;
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| 45 | sigset_t set;
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| 46 |
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| 47 | if (flags & WRDE_REUSE) wordfree(we);
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| 48 |
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| 49 | if (flags & WRDE_NOCMD) for (i=0; s[i]; i++) switch (s[i]) {
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| 50 | case '\\':
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| 51 | if (!sq) i++;
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| 52 | break;
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| 53 | case '\'':
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| 54 | if (!dq) sq^=1;
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| 55 | break;
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| 56 | case '"':
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| 57 | if (!sq) dq^=1;
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| 58 | break;
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| 59 | case '(':
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| 60 | if (np) {
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| 61 | np++;
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| 62 | break;
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| 63 | }
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| 64 | case ')':
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| 65 | if (np) {
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| 66 | np--;
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| 67 | break;
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| 68 | }
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| 69 | case '\n':
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| 70 | case '|':
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| 71 | case '&':
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| 72 | case ';':
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| 73 | case '<':
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| 74 | case '>':
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| 75 | case '{':
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| 76 | case '}':
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| 77 | if (!(sq|dq|np)) return WRDE_BADCHAR;
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| 78 | break;
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| 79 | case '$':
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| 80 | if (sq) break;
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| 81 | if (s[i+1]=='(' && s[i+2]=='(') {
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| 82 | i += 2;
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| 83 | np += 2;
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| 84 | break;
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| 85 | } else if (s[i+1] != '(') break;
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| 86 | case '`':
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| 87 | if (sq) break;
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| 88 | return WRDE_CMDSUB;
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| 89 | }
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| 90 |
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| 91 | if (flags & WRDE_APPEND) {
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| 92 | wc = we->we_wordc;
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| 93 | wv = we->we_wordv;
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| 94 | }
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| 95 |
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| 96 | i = wc;
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| 97 | if (flags & WRDE_DOOFFS) {
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| 98 | if (we->we_offs > SIZE_MAX/sizeof(void *)/4)
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| 99 | goto nospace;
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| 100 | i += we->we_offs;
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| 101 | } else {
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| 102 | we->we_offs = 0;
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| 103 | }
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| 104 |
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| 105 | if (pipe2(p, O_CLOEXEC) < 0) goto nospace;
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| 106 | __block_all_sigs(&set);
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| 107 | pid = fork();
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| 108 | __restore_sigs(&set);
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| 109 | if (pid < 0) {
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| 110 | close(p[0]);
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| 111 | close(p[1]);
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| 112 | goto nospace;
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| 113 | }
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| 114 | if (!pid) {
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| 115 | if (p[1] == 1) fcntl(1, F_SETFD, 0);
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| 116 | else dup2(p[1], 1);
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| 117 | execl("/bin/sh", "sh", "-c",
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| 118 | "eval \"printf %s\\\\\\\\0 x $1 $2\"",
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| 119 | "sh", s, redir, (char *)0);
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| 120 | _exit(1);
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| 121 | }
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| 122 | close(p[1]);
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| 123 |
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| 124 | f = fdopen(p[0], "r");
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| 125 | if (!f) {
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| 126 | close(p[0]);
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| 127 | kill(pid, SIGKILL);
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| 128 | reap(pid);
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| 129 | goto nospace;
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| 130 | }
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| 131 |
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| 132 | l = wv ? i+1 : 0;
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| 133 |
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| 134 | free(getword(f));
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| 135 | if (feof(f)) {
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| 136 | fclose(f);
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| 137 | reap(pid);
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| 138 | return WRDE_SYNTAX;
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| 139 | }
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| 140 |
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| 141 | while ((w = getword(f))) {
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| 142 | if (i+1 >= l) {
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| 143 | l += l/2+10;
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| 144 | tmp = realloc(wv, l*sizeof(char *));
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| 145 | if (!tmp) break;
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| 146 | wv = tmp;
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| 147 | }
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| 148 | wv[i++] = w;
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| 149 | wv[i] = 0;
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| 150 | }
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| 151 | if (!feof(f)) err = WRDE_NOSPACE;
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| 152 |
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| 153 | fclose(f);
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| 154 | reap(pid);
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| 155 |
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| 156 | if (!wv) wv = calloc(i+1, sizeof *wv);
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| 157 |
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| 158 | we->we_wordv = wv;
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| 159 | we->we_wordc = i;
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| 160 |
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| 161 | if (flags & WRDE_DOOFFS) {
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| 162 | if (wv) for (i=we->we_offs; i; i--)
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| 163 | we->we_wordv[i-1] = 0;
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| 164 | we->we_wordc -= we->we_offs;
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| 165 | }
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| 166 | return err;
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| 167 |
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| 168 | nospace:
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| 169 | if (!(flags & WRDE_APPEND)) {
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| 170 | we->we_wordc = 0;
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| 171 | we->we_wordv = 0;
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| 172 | }
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| 173 | return WRDE_NOSPACE;
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| 174 | }
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| 175 |
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| 176 | int wordexp(const char *restrict s, wordexp_t *restrict we, int flags)
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| 177 | {
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| 178 | int r, cs;
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| 179 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
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| 180 | r = do_wordexp(s, we, flags);
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| 181 | pthread_setcancelstate(cs, 0);
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| 182 | return r;
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| 183 | }
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| 184 |
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| 185 | void wordfree(wordexp_t *we)
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| 186 | {
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| 187 | size_t i;
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| 188 | if (!we->we_wordv) return;
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| 189 | for (i=0; i<we->we_wordc; i++) free(we->we_wordv[we->we_offs+i]);
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| 190 | free(we->we_wordv);
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| 191 | we->we_wordv = 0;
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| 192 | we->we_wordc = 0;
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| 193 | }
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